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Porter, Jason L. "Comparison of intraoral and extraoral scanners on the accuracy of digital model articulation." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/4881.
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Introduction: Orthodontists increasingly rely on digital models in clinical practice. The ability of modern scanners to articulate digital models must be scientifically evaluated. Methods:Twenty five digital articulated models were produced from four digital scanners in five experimental groups. The resulting inter-arch measurements were compared to the gold standard. An acceptable range of 0.5mm more or less than the gold standard was used for evaluation. Results: iTero® and iTero® Element yielded all acceptable inter-arch measurements. The 3M™ True Definition and Ortho Insight 3D® with Regisil® bite registration produced four of six acceptable inter-arch measurements. The Ortho Insight 3D® with Coprwax ™ bite registration yielded three of six acceptable inter-ach measurements. Conclusions: The iTero® and iTero® Element produced the most accurately articulated models. The 3M™ True Definition and Ortho Insight 3D® with Regisil® were the next most accurate. The Ortho Insight 3D® scanner with Coprwax ™ was the least accurate method tested.
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Durrett, Sharon Jeane. "Efficacy of composite tooth attachments in conjunction with the invisalign tm system using three-dimensional digital technology." [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004566.
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Thesis (M.S.)--University of Florida, 2004.Typescript. Title from title page of source document. Document formatted into pages; contains 35 pages. Includes Vita. Includes bibliographical references.
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Kriel, Earl Ari Mac. "Accuracy of orthodontic digital study models." Thesis, University of the Western Cape, 2012. http://hdl.handle.net/11394/4513.
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Magister Scientiae Dentium - MSc(Dent)Background: Plaster study models are routinely used in an Orthodontic practice. With the recent introduction of digital models, an alternative is now available, whereby three dimensional images of models can be analyzed on a computer. Aims and objectives: The aim of this study was to compare the measurements taken on digital models created from scanning the impression, digital models created from scanning the plaster model, and measurements done on the plaster models. The objectives were: Measurement differences between those taken directly on plaster models compared with measurements on digital models created from scanned impressions and digital models created from scanned plaster models. Methods: The study sample was selected from the patient records of one Orthodontist. They consisted of 26 pre-treatment records of patients that were coming for orthodontic treatment. Alginate impressions were taken of the maxillary and the mandibular arches. Each impression was scanned using a 3Shape R700™ scanner. Ortho Analyzer software from 3Shape was used to take the measurements on the digital study models. Within 24 hours plaster study models were cast from the impressions, and were scanned using a 3Shape R700™ scanner. On the plaster models the measurements were done with a MAX-CAL electronic digital calliper. The mesiodistal width as well as intermolar and intercanine width for both the maxillary and mandibular models were recorded.Results and discussion: Box plots used to compare the variability in each of the three measurement methods, suggest that measurements are less variable for Plaster. Plaster measurements for tooth widths were significantly higher (mean 7.79) compared to a mean of 7.74 for Digital Plaster and 7.69 for Digital impression. A mixed model analysis showed no significant difference among methods for arch width. Conclusions: Digital models offer a highly accurate alternative to the plaster models with a high degree of accuracy. The differences between the measurements recorded from the plaster and digital models are likely to be clinically acceptable.
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Harris, Angela Manbre Poulter. "Assessment of tooth movement in the maxilla during orthodontic treatment using digital recording of orthodontic study model surface contours." Thesis, University of the Western Cape, 2006. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_2231_1254312268.
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The aim of this project was to measure changes in dimension of the first three primary rugae and to evaluate tooth movement in the maxilla during orthodontic treatment in patients treated with and without premolar extractions.
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McCaffrey, Kevin. "Cephalometric regional superimpositions -- digital vs. analog accuracy and precision: 2. the mandible." Thesis, NSUWorks, 2014. https://nsuworks.nova.edu/hpd_cdm_stuetd/19.
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Introduction: Lateral cephalometric superimpositions (LCS) are used to measure dental and skeletal changes that occur in the craniofacial complex over time. Orthodontists use LCSs to assess treatment outcomes. The purpose of this study was to conduct an assessment of the measured displacement of defined dental landmarks across digital and analog methods of mandibular regional serial superimposition as compared to an implant-registered superimposition reference. The data used in this study was derived from the Mathew's Acquisition Group implant sample; the first United States longitudinal study of growing children with maxillary and mandibular Björk type metallic implants. Methods: Sixty-six lateral cephalometric radiographs were selected from twenty-two children. Three cephalometric tracings were completed for each subject that were then superimposed pairwise (T1 vs. T2, T2 vs. T3) across four separate methods of superimposition, two analog: Implant, Structural; and two digital: Dolphin, Quick Ceph. Each superimposition was then imported into Adobe Photoshop where the images were scaled and the displacement of defined dental structures was measured. Defined dental structures included: (1) first molar mesial contact point, (2) first molar apical root bisection, (3) central incisor root apex, and (4) central incisor crown incisal edge. A random-effects, generalized linear model was used to contrast dental landmark displacement measurements. Results: There was no difference between the mean displacement of defined dental structures between different methods (p=0.145). There was no difference between the different methods by defined dental structure (p=0.150). Conclusions: Our study demonstrated that there are no statistically significant differences among three methods of mandibular regional superimposition in comparison to an implant-registered (reference) method (analog: Structural, Implant; digital: Dolphin, and Quick Ceph). The historical data set utilized in our study, limited by the small sample size, resulted in a relatively low power (0.15). A low power increases the likelihood of incorrectly failing to reject a null hypothesis that is actually false. which must be considered in our study.
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Zuppardo, Marcelo Lelis. "Efeito da corticotomia e decorticalização na movimentação ortodôntica : estudo em ratos /." Universidade Estadual Paulista (UNESP), 2018. http://hdl.handle.net/11449/154786.
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Este estudo comparou dois protocolos cirúrgicos, corticotomia e corticotomia com decorticalização, em ratos para verificar alteração na movimentação ortodôntica convencional. 60 animais foram divididos aleatoriamente: Grupo controle (GC) - movimentação ortodôntica convencional; Grupo 1 (G1) -movimentação ortodôntica e corticotomia; Grupo 2 (G2) - movimentação ortodôntica com corticotomia e decorticalização. Os animais foram eutanasiados após 7 e 14 dias. No G1 e G2 houve uma maior movimentação ortodôntica comparado aos animais do GC aos 14 dias (p = 0,009 e 0,016) com uma maior área radiográfica interradicular, menor volume ósseo/volume total, menor área final e menor porcentagem de osso. Aos 7 dias os animais do G2 apresentaram menor volume de osso/volume total comparado com GC e aos 14 dias os animais do G2 apresentaram uma menor medida linear da crista óssea comparado com o GC. Os animais do GC aos 14 dias apresentaram uma maior área final comparado aos 7 dias, enquanto o G2 apresentou maior número de células TRAP positivas tanto aos 7 quanto aos 14 dias comparado com o G1. Na análise histológica aos 7 dias houve frequente reabsorção radicular inicial geralmente associada às áreas de hialinização e aos 14 dias, presença do infiltrado inflamatório e com menor ocorrência de áreas hialinas. O padrão de reabsorção radicular iniciado no 7º dia de movimento e consolidado no 14º dia. Concluímos que a corticotomia acelera a movimentação ortodôntica em 14 dias independente da magnitude da injúria cirúrgica
This study compared two surgical protocols, corticotomy and decorticalization corticotomy, in rats to verify alteration in conventional orthodontic movement. 60 animals were randomly divided: Group 1 (G1) orthodontic movement and corticotomy, and Group 2 (G2) orthodontic movement with corticotomy and decorticalization. The animals were euthanized after 7 and 14 days. In G1 and G2, there was a greater orthodontic movement compared to CG animals at 14 days (p = 0.009 and 0.016) with a higher interradicular radiographic area, lower bone volume / total volume, lower final area and lower percentage of bone. At 7 days the G2 animals presented lower bone volume / total volume compared to CG and at 14 days G2 animals presented a smaller linear measure of bone crest compared to CG. GC animals at 14 days presented a larger final area compared to 7 days, while G2 presented a higher number of TRAP cells positive at 7 and 14 days compared to G1. In the histological analysis at 7 days, there was frequent initial root resorption generally associated with hyalinization areas and at 14 days, presence of inflammatory infiltrate and less occurrence of hyaline areas. The root resorption pattern started on day 7 of movement and was consolidated on the 14th day. We conclude that corticotomy accelerates orthodontic movement in 14 days regardless of the magnitude of the surgical injury.
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Dubula, Vuyani Goodman. "Comparison of the accuracy of digital models obtained from scans of impressions versus direct intra-oral scans." University of the Western Cape, 2016. http://hdl.handle.net/11394/5606.
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Magister Chirurgiae Dentium - MChDMeasurements and a variety of analyses of dental casts are essential for precise diagnosis of an orthodontic case. Study models have long been an essential part of orthodontic diagnosis and treatment planning. Currently virtual computerized models are available to clinicians, supplemented by dedicated software for performing needed measurements (Zilberman et al, 2003). Digital impression methods are now available and intraoral digital scanning techniques make it possible to generate study models directly from the scanning of the dentition. The aim of this study was to compare measurements taken after scanning the dental impressions to the measurements obtained from using direct intraoral scanning of the dentition. Alginate impressions of the maxillary and mandibular dentitions were taken on 20 patients and these impressions were scanned using a 3 Shape R 700 TM scanner. Direct intraoral scans of both dentitions were then performed for the same patient. Ortho analyzer TM software was used to measure the mesiodistal widths of individual teeth, and the intercanine and intermolar on digital models of the scanned impressions and digital models obtained from direct intraoral scans of the maxillary and the mandibular dentitions. The results indicated that there were no statistically significant differences between mesiodistal widths, and intercanine and intermolar distances between the two techniques (p > 0.05). Because of the high level of accuracy of the virtual measurements compared to those of the scanned impressions, it can be concluded that direct intraoral scanning of the dentition can be used with confidence in the clinical situation to measure tooth sizes and inter-arch distances for orthodontic purposes. Orthodontists commonly use models for various areas in the practice, clinical research and medico-legal documentation (Marcel, 2001)
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Burzynski, Jennifer Ann. "A Comparison of Digital Intraoral Scanners and Alginate Impressions: Time & Patient Satisfaction." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1489694607035837.
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Andrews, Curtis Kyo-shin. "Validity and Reliability of Peer Assessment Rating Index Scores of Digital and Plaster Models." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1208136018.
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Madhoo, Amika. "A comparison of three types of orthodontic study models." University of the Western Cape, 2020. http://hdl.handle.net/11394/8126.
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Magister Scientiae Dentium - MSc(Dent)The aim of this present study was to compare the accuracy of digital and printed study models with plaster study models, that are considered the gold standard. The objectives were to compare the accuracy of measurements obtained from digital and printed study models with those of plaster study models, to establish which type of study model yielded the most accurate measurements in comparison to plaster study models and to identify possible disadvantages and errors that can be made using any of the three types of study models.
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Dragon, Carolyn Bradford. "Let’s Face It: The effect of orthognathic surgery on facial recognition algorithm analysis." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5778.
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Aim: To evaluate the ability of a publicly available facial recognition application program interface (API) to calculate similarity scores for pre- and post-surgical photographs of patients undergoing orthognathic surgeries. Our primary objective was to identify which surgical procedure(s) had the greatest effect(s) on similarity score.
Methods: Standard treatment progress photographs for 25 retrospectively identified, orthodontic-orthognathic patients were analyzed using the API to calculate similarity scores between the pre- and post-surgical photographs. Photographs from two pre-surgical timepoints were compared as controls. Both relaxed and smiling photographs were included in the study to assess for the added impact of facial pose on similarity score. Surgical procedure(s) performed on each patient, gender, age at time of surgery, and ethnicity were recorded for statistical analysis. Nonparametric Kruskal-Wallis Rank Sum Tests were performed to univariately analyze the relationship between each categorical patient characteristic and each recognition score. Multiple comparison Wilcoxon Rank Sum Tests were performed on the subsequent statistically significant characteristics. P-Values were adjusted for using the Bonferroni correction technique.
Results: Patients that had surgery on both jaws had a lower median similarity score, when comparing relaxed expressions before and after surgery, compared to those that had surgery only on the mandible (p = 0.014). It was also found that patients receiving LeFort and bilateral sagittal split osteotomies (BSSO) surgeries had a lower median similarity score compared to those that received only BSSO (p = 0.009). For the score comparing relaxed expressions before surgery versus smiling expressions after surgery, patients receiving two-jaw surgeries had lower scores than those that had surgery on only the mandible (p = 0.028). Patients that received LeFort and BSSO surgeries were also found to have lower similarity scores compared to patients that received only BSSO when comparing pre-surgical relaxed photographs to post-surgical smiling photographs (p = 0.036).
Conclusions: Two-jaw surgeries were associated with a statistically significant decrease in similarity score when compared to one-jaw procedures. Pose was also found to be a factor influencing similarity scores, especially when comparing pre-surgical relaxed photographs to post-surgical smiling photographs.
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Bueno, George Nunes. "Confiabilidade de diferentes métodos de aquisição de modelos dentários digitais." Universidade do Estado do Rio de Janeiro, 2014. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6645.
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Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorO uso de modelos de estudo dentários faz parte tanto da prática quanto da pesquisa odontológica e ortodôntica. Com a introdução dos scanners 3D e dos tomógrafos CBCT (cone beam computer tomography) tornou-se possível a obtenção de modelos dentários tridimensionais virtuais das arcadas dentárias. Foram selecionados 56 modelos dentários superiores e escaneados em três tipos diferentes de scanners: Maestro 3D Dental Scanner (AGE Solutions, Potedera, Italia), 3Shape R700 3D Scanner (3Shape, Copenhagen, Dinamarca) e o scanner 3Shape TRIOS (3Shape, Copenhagen, Dinamarca). Doze medidas foram realizadas nos modelos dentários de gesso e comparadas com as mesmas medidas realizadas nos modelos dentários digitais por meio do teste de Análise de Variância (ANOVA). Estatisticamente não foram encontradas diferenças significativas entre as medições tradicionais nos modelos dentários de gesso e as medidas realizadas nos modelos dentários digitais. Os três tipos de métodos de aquisição de modelos dentários digitais foram considerados confiáveis para as medições horizontais, transversais e verticais. Os modelos dentários virtuais podem ser indicados como substitutos dos modelos dentários de gesso.
The use of dental study casts is part of the practice and research in dentistry and orthodontics. With the advent of 3D scanners and CBCT (cone beam computer tomography) scanners, it became possible to obtain three-dimensional virtual dental casts of the dental arches. 56 upper dental casts were selected and scanned in three different types of scanners: Maestro 3D Dental Scanner (AGE Solutions, Potedera, Italy), 3Shape R700 3D Scanner (3Shape, Copenhagen, Denmark) and 3Shape TRIOS scanner (3Shape, Copenhagen, Denmark). 12 Measurements were performed on dental plaster models and compared with the same measurements in digital dental models through test Analysis of Variance (ANOVA). No statistically significant differences were found between the traditional measurements in dental plaster models and measurements taken in the digital dental models. The three kinds of methods to acquire digital dental models were considered reliable for horizontal, vertical and cross measurements. The virtual dental models can be indicated as substitutes for dental plaster models.
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Jambi, Safa Abdulsalam A. "Investigations into orthodontic anchorage." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/investigations-into-orthodontic-anchorage(b3769a47-e782-4b85-b8b4-21cb186e0fdd).html.
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Background and objectives: The control of anchorage is integral to successful orthodontic treatment. The objective of this research was to undertake three related projects to evaluate methods of increasing anchorage with the aim of adding to orthodontic knowledge and improve methods of treatment delivery. Methods: Two Cochrane systematic reviews were undertaken according to the methods published in the Cochrane Handbook for Systematic Reviews of Interventions, version 5.1.0. The influence of functional appliances on tooth position and the extraction decision was performed as a retrospective study using participants from a completed multicentre randomized trial. Results: 1- Statistically and clinically significant differences were found between the mean values of distal molar movement when surgical anchorage and conventional anchorage were compared. 2- Statistically significant differences were found between the mean values of distal molar movement and mesial upper incisor movement when intraoral distalising appliances and cervical headgear were compared.3- Fixed and removable functional appliances are equally effective in anchorage preparation. The type of functional appliance and time spent in Phase I treatment influenced the amount of lower incisor proclination. Conclusions: 1- Surgical anchorage is more effective than headgear without the inherent risks and compliance issues. However, intraoral appliances used in adolescence for distalisation of upper molars do not appear to have any advantages over cervical headgear. 2- Functional appliances reduce the anchorage requirements of a case primarily by reduction of the overjet, both fixed and removable functional appliances are equally effective in obtaining this. However, fixed functional appliances result in greater lower incisor proclination than removable functional appliances. 3- The type of functional appliance (removable or fixed) does not influence the extraction decision, however, this is influenced by overall space requirements.
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Shaw, Douglas. "Cephalometric regional superimpositions -- digital vs. analog accuracy and precision : 3. the cranial base." Thesis, NSUWorks, 2014. https://nsuworks.nova.edu/hpd_cdm_stuetd/18.
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Objective. To assess the accuracy and precision in measurement of pairwise implant displacement across three methods of cranial base superimposition. Background. Cephalometric superimposition is the principal radiographic method used to evaluate changes within the craniofacial skeleton. Many studies have examined the accuracy of software intended to produce cephalometric superimposition. Such studies have utilized anatomic landmarks, selected by the respective software manufacturers, as registration points for constructing superimpositions and their analysis. As a result, these studies are only as accurate as the stability and validity of anatomic registration landmarks used. To our knowledge, no other study has utilized metallic implants to critically assess digital vs. analog cephalometric cranial base superimposition. Methods. Serial cephalograms from twenty-two patients across three time points containing metallic implants were obtained from the Mathews Acquisition Group. Each of the sixty-six cephalograms was traced by hand and digitally. Cranial base superimpositions were completed according to the analog structural method proposed by Björk and Skieller, and Johnston, and then by Dolphin version 11.5 and Quick Ceph Studio V3.2.8 digital software according to manufactures instructions. Total displacement measurements of selected implants across paired time points were recorded for both digital methods and analog method of superimposition with analog serving as the reference. Results: There were no statistically significant contrasts of mean total displacement of implants by superimposition method (p = 0.999). No significant differences are reported in mean implant displacement when comparing digital to analog superimposition methods for contrasts by time, structure, or implant location. Conclusions: The results show that there are no significant differences in accuracy and precision of digital and analog cranial base superimposition. The results of this study suggest that cranial base superimpositions on S-Na that are registered on S may be a good approximation of the structural method of cranial base superimposition. There are many methodological differences between digital and analog cranial base superimposition and future research examining such differences is recommended.
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Junqueira, José Luiz Cintra. "Avaliação comparativa entre as telerradiografias cefalométricas laterais convencional, digital e geradas por tomografia computadorizada por aquisição volumétrica - cone beam /." Araçatuba : [s.n.], 2007. http://hdl.handle.net/11449/104521.
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Orientador: Francisco Antonio BertozBanca: Eduardo Cesar Almada Santos
Banca: José Augusto Sproesser
Banca: Ney Soares de Araújo
Banca: Thomaz Wassal
Resumo: O objetivo nesta pesquisa foi analisar os resultados obtidos comparativamente entre as telerradiografias cefalométricas laterais convencional, digital e as geradas pela tomografia computadorizada por aquisição volumétrica Cone Beam (CBTC). Foram realizadas distintamente as três tomadas radiográficas em 35 pacientes que estavam compreendidos na faixa etária de 12 a 14 anos. Foram utilizados dois programas específicos para a realização das análises cefalométricas de Rickets, McNamara e Jarabak, sendo utilizadas medidas lineares e angulares dos traçados. Apenas no traçado de Jarabak, foram utilizadas duas medidas lineares, para todas as outras, foi usada somente uma mensuração. Quatro tipos de exames radiográficos associados aos programas de análise cefalométrica foram utilizados. Por considerar o melhor resultado nos valores obtidos, a variável de referência foi a aquisição volumétrica CBTC em norma ortogonal, sendo comparado com os outros métodos. Verificou-se que os resultados obtidos pelas medidas angulares apresentaram menor variabilidade, enquanto as medidas lineares somente no traçado cefalométrico de McNamara obteve-se similaridade das variáveis. Observou-se que as técnicas radiográficas cefalométricas laterais convencionais apresentaram as maiores discrepâncias em relação à variável de referência. As análises cefalométricas realizadas pelo mesmo programa obtiveram os melhores resultados. Concluiu-se que para a obtenção de análises cefalométricas mais fidedignas deve-se utilizar um mesmo programa de avaliação e a tecnologia digital, principalmente a aquisição volumétrica CBTC em norma ortogonal e a telerradiografia cefalométrica lateral digital.
Abstract: The aim of this research was to analyze the results obtained comparatively among digital and conventional lateral cephalometric teleradiographies and the ones generated by Cone Beam volume computerized tomography (CBCT). Three distinct radiographies were performed in 35 patients in a 12 to 14 year-old group. Two specific programs were used to perform the cephalometric analysis according to Ricketts, McNamara and Jarabak, using linear and angular measurements of tracings. Two linear measurements were used just for Jarabak's tracing, for all the others only one measurement was used. Four types of radiographic exams associated to the cephalometric analysis program were used. For considering the best result in the obtained values, the variable of reference was the volume acquisition (CBCT) being compared to the other methods. It was verified that the results obtained by angular measurements presented less variability, while the linear measurements only in McNamara's cephalometric tracing presented similarity of variables. It was observed that the conventional lateral cephalometric radiography techniques presented bigger discrepancies in relation to the variable of reference. The cephalometric analysis performed by the same evaluation program had the best results. It was concluded that in order to obtain more reliable cephalometric analysis, one should use the same evaluation program and digital technology, particularly the volume acquisition (CBCT) in octagonal norm and digital lateral cephalometric teleradiography.
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Junqueira, José Luiz Cintra [UNESP]. "Avaliação comparativa entre as telerradiografias cefalométricas laterais convencional, digital e geradas por tomografia computadorizada por aquisição volumétrica – cone beam." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/104521.
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junqueira_jlc_dr_araca.pdf: 590701 bytes, checksum: 5985895fd4803a2523f4047b068089a6 (MD5)O objetivo nesta pesquisa foi analisar os resultados obtidos comparativamente entre as telerradiografias cefalométricas laterais convencional, digital e as geradas pela tomografia computadorizada por aquisição volumétrica Cone Beam (CBTC). Foram realizadas distintamente as três tomadas radiográficas em 35 pacientes que estavam compreendidos na faixa etária de 12 a 14 anos. Foram utilizados dois programas específicos para a realização das análises cefalométricas de Rickets, McNamara e Jarabak, sendo utilizadas medidas lineares e angulares dos traçados. Apenas no traçado de Jarabak, foram utilizadas duas medidas lineares, para todas as outras, foi usada somente uma mensuração. Quatro tipos de exames radiográficos associados aos programas de análise cefalométrica foram utilizados. Por considerar o melhor resultado nos valores obtidos, a variável de referência foi a aquisição volumétrica CBTC em norma ortogonal, sendo comparado com os outros métodos. Verificou-se que os resultados obtidos pelas medidas angulares apresentaram menor variabilidade, enquanto as medidas lineares somente no traçado cefalométrico de McNamara obteve-se similaridade das variáveis. Observou-se que as técnicas radiográficas cefalométricas laterais convencionais apresentaram as maiores discrepâncias em relação à variável de referência. As análises cefalométricas realizadas pelo mesmo programa obtiveram os melhores resultados. Concluiu-se que para a obtenção de análises cefalométricas mais fidedignas deve-se utilizar um mesmo programa de avaliação e a tecnologia digital, principalmente a aquisição volumétrica CBTC em norma ortogonal e a telerradiografia cefalométrica lateral digital.
The aim of this research was to analyze the results obtained comparatively among digital and conventional lateral cephalometric teleradiographies and the ones generated by Cone Beam volume computerized tomography (CBCT). Three distinct radiographies were performed in 35 patients in a 12 to 14 year-old group. Two specific programs were used to perform the cephalometric analysis according to Ricketts, McNamara and Jarabak, using linear and angular measurements of tracings. Two linear measurements were used just for Jarabak’s tracing, for all the others only one measurement was used. Four types of radiographic exams associated to the cephalometric analysis program were used. For considering the best result in the obtained values, the variable of reference was the volume acquisition (CBCT) being compared to the other methods. It was verified that the results obtained by angular measurements presented less variability, while the linear measurements only in McNamara’s cephalometric tracing presented similarity of variables. It was observed that the conventional lateral cephalometric radiography techniques presented bigger discrepancies in relation to the variable of reference. The cephalometric analysis performed by the same evaluation program had the best results. It was concluded that in order to obtain more reliable cephalometric analysis, one should use the same evaluation program and digital technology, particularly the volume acquisition (CBCT) in octagonal norm and digital lateral cephalometric teleradiography.
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Miller, Cara. "The use of QLF-D (quantitative light-induced fluorescence-digital™) as an oral hygiene evaluation tool to assess plaque accumulation and enamel demineralisation in orthodontics." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/2009370/.
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Aim: To assess the use of the Quantitative Light-induced Fluorescence-Digital BiluminatorTM (QLF-DTM) as an oral hygiene evaluation tool to detect demineralisation and plaque during orthodontics Design: Randomised clinical trial Settings: Liverpool University Dental Hospital Subjects: 33 patients (21 females, 12 males) currently undergoing upper and lower fixed orthodontic appliance treatment were recruited. The median age of patients was 14.6 years with a range from 11.0 to 37.4 years. Methods: The patients were randomly allocated, stratified by the presence of demineralisation at baseline (T0), to receiving oral hygiene reinforcement (OHR) at four consecutive appointments (T1-T4) using the White light (WL) or Quantitative Light-induced Fluorescence (QLF) images, taken with the QLF-DTM device (Inspektor Research Systems BV, Amsterdam, The Netherlands), as visual aids. The standard of oral hygiene was assessed on the QLF images using customised software to provide quantitative scoring of fluorescence loss (ΔF) and plaque coverage (ΔR30) at each appointment. Inter-examiner reliability assessments were conducted by 4 examiners using QLF and WL images from 7 patients. One examiner assessed the images on a second occasion two weeks later to ascertain the intra-examiner reliability. A debriefing questionnaire, distributed on completion of the study, was used to ascertain the patients’ perspectives of the QLF-DTM images. Results: There were no significant differences in demineralisation (ΔF: P=0.56) or plaque accumulation (ΔR30; P=0.95) between the WL and QLF groups from T0 to T4. There were no significant reductions in ΔF in the WL or the QLF group from T0-T4 (P > 0.05), however there was a significant reduction in ΔR30 (P < 0.05). The inter-examiner reliability of QLF image assessment, using ICC, was 0.994 and 0.998 for ΔF and ΔR30 respectively. The inter-examiner reliability of WL image assessment, using kappa, ranged from 0.504 to 0.785. The intra-examiner reliability scores were additionally high with an ICC of 0.988 and 1.0 for ΔF and ΔR30 respectively on the QLF images. The kappa score of demineralisation assessment on the WL images was 1.0. All of the participants found being shown the images helpful and were able to see areas of demineralisation and plaque accumulation. 100% of the QLF group thought it would be useful to be given OHR for the full duration of orthodontic treatment compared to 81% of the WL group (OR 2.3, 95% CI: 1.5-3.5). Conclusion: QLF-DTM can be used to detect and monitor demineralisation and plaque during orthodontics. The image analysis demonstrated high levels of inter- and intra-examiner reliability. OHR at consecutive appointments using the WL or QLF images as visual aids is effective in reducing plaque coverage. Whilst there was no apparent statistical benefit in terms of reducing levels of demineralisation or plaque of using QLF images over WL images, patients reported that they were more informative.
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Sanches, Francyle Simões Herrera. "Efeitos da movimentação dentária mesiodistal para área de rebordo alveolar atrófico: avaliação por meio de modelos digitais." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/25/25144/tde-03092015-112251/.
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Objetivos: O objetivo deste estudo foi avaliar em adultos com perdas dos primeiros molares inferiores permanentes, as inclinações e angulações dentárias dos dentes adjacentes, bem como a espessura do rebordo após movimentação mesial de segundos molares para suprir a perda e verticalização dos segundos molares para reabilitação protética. Métodos: Foram selecionados 2 grupos de estudo. O Grupo Fechamento (GF) foi composto por 12 hemiarcos com ausência de primeiros molares permanentes e espaços variando entre 2 a 7mm, que foram tratadas ortodonticamente com fechamento do espaço. O Grupo Abertura (GA) foi composto por 14 hemiarcos com ausência de primeiros molares permanentes e espaços variando entre 7,1 a 12mm, que foram tratadas ortodonticamente com verticalização do segundo e terceiro molar e reabertura de espaço para reabilitação protética. Avaliou-se em modelos dentários digitais a angulação, a inclinação, a dimensão cérvico-oclusal e a espessura do rebordo. As comparações interfases e intergrupos foram realizadas com os testes t-pareado e t-independente respectivamente (p<0,05). Resultados: Houve melhora na angulação dos segundos molares inferiores tanto no GF quanto no GA, mostrando eficácia da mecânica em ambas as terapias; não houve alterações significantes nas inclinações vestibulolinguais dos dentes posteriores em ambos os grupos; a espessura do rebordo aumentou no GF e manteve-se constante no GA. Conclusões: As duas modalidades de tratamento demonstraram resultados adequados. A escolha do plano de tratamento deve ponderar a relação custo-benefício de cada caso, considerando-se a dimensão inicial do espaço, a presença dos terceiros molares, as condições periodontais iniciais, o tempo de tratamento e o custo financeiro.Objectives: The aim of this study was to evaluate, in adults with loss of the first permanent molars, the inclinations and angles of adjacent teeth as well as the alveolar ridge thickness after mesial movement of second molars to close the space of the tooth loss and second molar uprighting to rehabilitation prosthetic. Methods: Two study groups were selected. The Group Closure (GC) was composed of 12 quadrants with no permanent first molars and edentulous spaces varying from 2 to 7mm, which were treated with orthodontic space closure. The Group Opening (GO) was composed of 14 quadrants with no permanent first molars and edentulous spaces varying from 7.1 to 12mm, which were treated with orthodontic uprighting of the second and third molars and reopening space for prosthetic rehabilitation. In digital dental models were evaluated the angulation, inclination, the cervical-occlusal dimension and alveolar ridge thickness. Interphase and intergroup comparisons were performed with with paired t-test and independent t-test, respectively (p <0.05). Results: There was improvement in the angulation of the mandibular second molars both in GC and GO, showing the mechanical efficiency in both therapies; there were no significant changes in buccolingual inclinations of the posterior teeth in both groups; the alveolar ridge thickness increased in GC and remained constant in GO. Conclusions: Both treatment modalities have demonstrated appropriate results. The choice of treatment plan should consider the cost-benefit of each case, taking into account the initial dimension of the space, the presence of third molars, initial periodontal conditions, treatment time and the financial cost.
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Konakovic, Damir. "Orthodontic diagnostics and measurements on digital study models made with an intraoral scanner." Thesis, Malmö högskola, Odontologiska fakulteten (OD), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-19970.
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Introduktion:Modellanalys har traditionellt gjorts på fysiska gipsmodeller. Idag finns ny teknik som möjliggör framställning av digitala modeller utan behov av konventionella avtryck. Syftet med den här studien är att undersöka tillförlitligheten hos digitala modeller framställda med en intraoral scanner, patientupplevelsen och olika tidsaspekter förenade med tekniken.Metod:På ett urval av 20 vuxna personer gjordes både konventionell avtryckstagning och en intraoral scanning (TRIOS, 3Shape) av bettet för framställning av gipsmodeller och digitala modeller. Den kliniska tidsåtgången mättes och personerna besvarade ett frågeformulär gällande sin upplevelse av metoderna. Fyra observatörer diagnostiserade bettrelationer och utförde ortodontiska mätningar på gipsmodeller med ett skjutmått och digitala modeller med OrthoAnalyzer Orthodontics (3Shape, Danmark). Tidsåtgången mättes för digital- respektive konventionell modellanalys. Statistiska analyser gjordes utifrån Paired samples t test, korstabeller och frekvensanalys.Resultat:Diagnostik av horisontella-, vertikala- och transversella bettrelationer på digitala modeller har hög tillförlitlighet. Få statistiskt signifikanta skillnader fanns för linjära mätningar på digitala modeller jämfört med gipsmodeller. För majoriteten av observatörerna tog digital modellanalys längre tid än konventionell modellanalys. Likaså var den kliniska tidsåtgången för intraoral scanning signifikant längre än för konventionell avtryckstagning och metoden prioriterades lägre av försökspersonerna.Konklusion:Digitala modeller framställda med en intraoral scanner är en tillförlitlig metod för ortodontisk diagnostik och terapiplanering. Tekniken har en rad fördelar och förbättras ständigt men dess acceptans för den enskilde klinikern blir i slutändan en kostnadsfråga.Introduction:Model analysis has traditionally been carried out on physical plaster models. New technology allows the production of digital models without the need for conventional impressions. The purpose of this study was to evaluate the validity of digital models made with an intraoral scanner, patient experience and different time aspects associated with this technology.Methods:A sample of 20 adults was selected. Plaster models and digital models were obtained from conventional impressions and an intraoral scanning (TRIOS, 3Shape) respectively. The clinical time required for impression taking and intraoral scanning was recorded and the subjects were asked to answer a questionnaire regarding their experience of both methods. Four independent examiners diagnosed malocclusions and performed measurements with a digital caliper on plaster models and by using OrthoAnalyzer Orthodontics (3Shape, Denmark) for digital models. Time required for digital- and conventional model analysis respectively, was recorded. Statistical analysis was performed by using Paired samples t test, crosstabs and frequency analysis.Results:Diagnostics of horizontal-, vertical- and transversal malocclusions with digital models showed high validity. Few statistically significant differences were found for measurements made on digital models compared to direct measurements on plaster models. For a majority of the examiners, digital model analysis was more time consuming than conventional model analysis. Also, clinical time required for intraoral scanning was significantly greater than for conventional impression taking. The subjects preferred conventional impression taking.Conclusions:Digital models made with an intraoral scanner are a reliable method for orthodontic diagnostics and treatment planning. The technique has a number of advantages and is constantly improving but its acceptance depends ultimately on the cost-effectiveness ratio to the individual practitioner.
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Al-Abdallah, Mariam. "The development of a new digital method of analysing three dimensional orthodontic tooth movement." Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493436.
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Aim: To develop a method to study linear, angular and rotational tooth movements in three dimensions using a surface laser scanning technique. Design: An experimental methodological study. Material and methods: The Konica Minolta Vivid 910 non-contact surface laser scanner was used to convert plaster models into digital data, which were then analysed by Rapidform™2006 software.
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CANTARELLA, DANIELE. "MINIMALLY INVASIVE SURGERY TO FACILITATE MICRO-IMPLANT SUPPORTED MAXILLARY SKELETAL EXPANSION IN ADULT PATIENTS." Doctoral thesis, Università degli Studi di Milano, 2022. http://hdl.handle.net/2434/914517.
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Introduction
The aim of the present study is to evaluate the skeletal modifications induced by maxillary expansion supported by palatal micro-implants and localized osteotomies produced with minimally invasive surgical technique in young-adult and adult patients.
In the present investigation, osteotomies had a lower extension than the ones used in conventional surgically assisted rapid palatal expansion (SARPE), to adopt a minimally invasive surgical technique that can be performed with greater comfort for the patient and less post-operative sequelae. More in detail, the localized osteotomies were executed only in the anterior part of the midpalatal suture and bilaterally at the basis of the zygomatic process of the maxilla without involvement of the piriform rim. These areas represent a great resistance to the lateral maxillary movement. Furthermore, they are of simple surgical access and don’t present important arterial plexuses.
Patients requiring micro-implant supported maxillary expansion and/or SARPE routinely undergo a pre-treatment cone-beam computed tomography (CBCT) of the skull, to plan the surgical operation and, one month after treatment a secondary CBCT for a surgical and orthodontic control.
CBCT is a low radiation tomography, extensively used in maxillofacial surgery and in dentistry. For the implementation of this study, that aims at evaluating the efficacy of micro-implant-supported maxillary expansion in combination with localized osteotomies, only radiologic exams that are anyway needed for the planning and post-treatment evaluation were used.
Aim
The aim of the present study is to evaluate the advantages introduced in the treatment of maxillary constriction by the therapy with micro-implant supported Maxillary Skeletal Expander (MSE) and localized osteotomies in young-adult and adult patients.
The main objective is to evaluate the efficacy of the technique, by measuring the movement of skeletal landmarks in the midface, particularly on the maxillary and zygomatic bones, and on the lateral wall of the nose, by comparing the pre-treatment and post-treatment CBCT.
For this particular technique, a new methodology for digital planning of position of MSE and miniscrews on patient CBCT was developed. Furthermore, incorporation of 2 additional miniscrews to the original MSE design, which conventionally features only 4 miniscrews, was developed with the aid of computer aided design – computer aided manufactured (CAD-CAM) technology.
Methods
The study presented the following steps:
▪ Development of a digital planning methodology for positioning the miniscrews and MSE appliance on pre-treatment CBCT
▪ Development of a CAD-CAM methodology for incorporating 2 additional miniscrews to the original MSE design with 4 miniscrews
▪ Selection of patients with age above 17 years, without congenital craniofacial syndromes, who require intervention of maxillary skeletal expansion
▪ Acquisition of initial CBCT with 17 x 13.5 cm field of view (FOV)
▪ Intervention of maxillary expansion supported by palatal micro-implants and localized osteotomies executed with minimally invasive surgical technique
▪ One month after treatment, acquisition of post-treatment CBCT with 17 x 13.5 cm FOV
▪ Analysis of skeletal modifications in the midface (maxillary bone, sphenoid bone, zygomatic arch, nasal cavity, etc.), by comparing the pre- and post- treatment CBCT with a 3D software (OnDemand software by Cybermed)
Results
The new methodology allowed the digital planning of MSE and miniscrews positioning on patients’ CBCTs, and the incorporation of two additional miniscrews to the original MSE design through CAD-CAM technology.
In the clinical trial, a total of four patients had an average age of 27.6 years (range 22.1 – 39.9 years).
MSE appliance was activated by an average of 6.0 mm and generated a parallel split of the midpalatal suture of 3.4 mm, 3.0 mm and 3.6 mm at anterior nasal spine (ANS), nasopalatine foramen (NPF) and posterior nasal spine (PNS), respectively.
Skeletal modifications were found in all CBCT sections evaluated in the study (axial palatal, upper nasal, coronal zygomatic, axial zygomatic), indicating that all midfacial bones are affected by maxillary expansion with MSE and localized osteotomies.
Particularly, skeletal changes were noticed also in CBCT sections above the lateral maxillary osteotomies (LMOs), in the maxilla, zygomatic bone, zygomatic arches, and nasal cavity. In the upper nasal section (UNS) the maxilla was laterally displaced by 2.4 mm and 0.9 mm, at its anterior and posterior extremities, respectively.
The frontozygomatic angle (FZA) increased by 1.9° (average of right and left side), while the lower interzygomatic distance increased by 2.9 mm, indicating a rotation of the zygomatic bone in a lateral direction.
The zygomatic arch was affected by bone bending phenomena and was deflected in an outward direction, with increase in the anterior intermaxillary distance by 1.7 mm and in the posterior inter-zygomatic distance by 1.6 mm.
The nasal width (NW) parameter increased by 2.9 mm with treatment: this anatomical finding is the basis for a potential improvement in nasal breathing for patients suffering from increased nasal airway resistance.
The cited modifications in skeletal structures above lateral maxillary osteotomies (LMOs) are most likely due to the fact that LMOs didn’t involve the piriform rim of the maxilla, and this point needs further investigations.
Regarding dentoalveolar modifications, the inter-molar distance increased by 7.4 mm, and molars underwent a small dentoalveolar tipping in a buccal direction by 1.1° (average of right and left side), as evidenced by the change in molar basal bone angle (MBBA).
No intra-operatory hemorrhage nor post-operatory bleeding was reported in treated patients, probably due to the lack of pterygopalatine suture surgical disjunction.
A limitation of the study is its small sample size, represented by 4 patients. A larger number of patients is required to confirm the above results.
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Mercier-Tonneau, Gaële. "Succion du pouce et orientations thérapeutiques." Lille 2, 1992. http://www.theses.fr/1992LIL2D025.
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Araújo, Luiz Fernando. "Avaliação da qualidade nas finalizações ortodônticas utilizando modelos digitais /." São José dos Campos, 2018. http://hdl.handle.net/11449/180337.
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Orientador: Rubens Nisie TangoBanca: Carolina Machado Martinelli Lobo
Banca: Anna Karina Figueiredo Costa
Resumo: A finalização ortodôntica é uma etapa crucial para a obtenção do equilíbrio oclusal e estético. A avaliação da qualidade nas finalizações ortodônticas atende a critérios clínicos já conhecidos, porém, depende de uma análise subjetiva por parte do profissional envolvido. Vários estudos se propuseram a criar índices para a avaliação da qualidade dos tratamentos ortodônticos, porém, todos eles encontraram dificuldades frente a subjetividade nas análises. Este estudo tem como objetivo criar uma metodologia de processos para análise computacional objetiva da qualidade nas finalizações ortodônticas.Para tanto, serão utilizados o escaneamento intraoral, bem como a construção de modelos virtuais e análise comparativa dos diferentes estágios do tratamento. O objetivo é padronizar a avaliação das finalizações ortodônticas e o processo de monitoramento da terapêutica administrada, facilitar a comunicação profissional x paciente e profissional x profissional, auxiliando nos tratamentos multidisciplinares e trazendo objetividade as análises qualitativas
The completion of orthodontic treatment is a crucial step in obtaining occlusal and aesthetic balance. The evaluation of the quality in the orthodontic finalizations fulfills already known clinical criteria, however, it depends on a subjective analysis by the professional involved. Several studies have attempted to create index for the evaluation of the quality of orthodontic treatments, all of which have found difficulties regarding subjectivity in the analyzes. This study aims to create a methodology of processes for objective computational analysis of quality in orthodontic finalizations. Intraoral scanning will be used, as well as the building of virtual models and comparative analysis of the different stages of the treatment. The objective is to achieve standardization in the evaluation of orthodontic finalizations, as well as a monitoring process of the administered therapy, facilitating professional communication x patient and professional x professional, assisting in the multidisciplinary treatments and bringing objectivity to the qualitative analyzes
Mestre
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Quintão, Ana Paula Abdo. "Avaliação da quantidade de movimentação dentária com fios de níquel-titânio e aço multifilamentado na fase inicial de tratamento ortodôntico com aparelho fixo." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/4497.
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Este ensaio clínico retrospectivo randomizado longitudinal teve como objetivo comparar a eficácia clínica de duas ligas diferentes de fios ortodônticos (0,016 "de níquel-titânio e 0,0155" coaxial multifilamentado, utilizados para o alinhamento e nivelamento dos dentes durante 6 semanas. Avaliou-se também a quantidade de movimentação tridimensional. A tecnologia digital tem sido amplamente utilizada em modelos de gesso tridimensionais. Entretanto, há um pequeno número de ensaios clínicos. Métodos: A amostra foi composta por dois grupos de modelos de gesso obtidos de 12 pacientes jovens cada, incluindo ambos os maxilares, superior e inferior, dos pacientes. Os moldes foram digitalizados, com o escâner Maestro 3D, em dois tempos diferentes de tratamento: T1, antes da colocação do fio; e T2, 8 semanas após a sua colocação, totalizando 96 imagens digitalizadas. O programa Geometric Qualify foi utilizado para superposição de maxilares superiores e inferiores. Usando as rugas palatinas como ponto fixo para superposição das arcadas superiores, um método utilizando os modelos em oclusão foi criado pra transferir um ponto fixo das arcadas superiores para as arcadas inferiores, permitindo também, a superposição das mesmas. A quantidade precisa de movimento gerada por cada tipo de fio foi medida e visualizada através do programa CMF Application, usando linhas de contorno e mapas coloridos como ferramentas. Resultados: O fio 0,016" níquel-titânio promoveu maior quantidade de movimento dentário, que foi estatisticamente significativa, utilizando o teste de Mann-Whitney U (p <0,05). Conclusão: Os fios de níquel-titânio promoveram maior quantidade de movimentação dentária do que os fios de aço inoxidável multifilamentado.
This longitudinal retrospective randomized clinical trial aimed to compare the clinical effectiveness of two different orthodontic alloy wires (.016” nickel-titanium and .0155“ multistranded coaxial) used for dental alignment and leveling during 6 weeks. The amount of tridimensional movement was also evaluated. Digital technology has been widely used in three-dimensional dental casts. Therefore, there are a short number of clinical trials. Methods: The sample was composed by two groups of 12 young patients’ casts of both upper and lower jaws. The casts were digitalized, with Maestro 3D scanner, in two different times of treatment: T1 was before the wire was placed and T2 was 8 weeks after its placement, in a total of 96 jaw digitalized images. Geometric Qualify Software was used to generate the superimposition of upper and lower jaws. Using the palatal ruggaes as a fixed point for superimposition of the upper jaw, a method using it and the models in occlusion was created to transfer a fixed point to the lower jaws, allowing its superimposition as well. The precise quantity of movement generated by each type of wire was measured and visualized through CMF Application software by using isolines and color maps tools. Results: The .016" nickeltitanium wire promoted greater amount of tooth movement, which was statistically significant, using Mann-Whitney U test (p < 0.05). Conclusion: The nickel-titanium wires promoted a higher quantity of tooth movement than the multistranded stainless steel wire.
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Chavez, Janet Elizabeth Romero La Fuente. "Avaliação da reabsorção radicular externa em dentes tratados endodonticamente após tratamento ortodôntico por meio de análise comparativa de métodos radiográficos." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/23/23145/tde-17062009-163016/.
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Esta pesquisa teve por objetivo avaliar a reabsorção radicular externa em dentes tratados endodonticamente após tratamento ortodôntico, por meio de análise das imagens das radiografias panorâmica final digitalizada, convencional periapical digitalizada e digital direta, como também comparar os métodos radiográficos empregados. Foram selecionados, após uma avaliação de 2.130 documentações ortodônticas 20 dentes de pacientes com documentação ortodôntica completa, boas condições de saúde, faixa etária entre 25 a 50 anos de ambos os sexos e com dentes anteriores (incisivo central ou lateral) tratados endodonticamente antes da realização do tratamento ortodôntico. De cada documentação ortodôntica completa foi selecionada a radiografia panorâmica inicial e final e, posteriormente, foram obtidas duas radiografias periapicais atuais de cada dente, uma pela técnica convencional e outra digital direta. Após a obtenção e identificação das radiografias, as imagens da panorâmica final digitalizada, radiografia periapical convencional digitalizada e digital direta foram analisadas na tela do computador por três especialistas (endodontista, ortodontista e radiologista). Estes avaliaram se a reabsorção radicular externa estava presente ou ausente no dente tratado endodonticamente após tratamento ortodôntico, bem como compararam os métodos empregados verificando sua confiabilidade. Os seguintes parâmetros foram observados: a) lesão periapical, b) espaço pericementário e c) limite do tratamento endodôntico. As observações foram submetidas à análise estatística chegando-se às seguintes conclusões: 1) A maioria dos ortodontistas não utiliza radiografias periapicais para avaliar os dentes tratados endodonticamente antes do tratamento ortodôntico, o que pode comprometer o andamento e o resultado final do tratamento, visto que a reabsorção radicular não apresenta um caráter sintomatológico no seu diagnóstico; 2) Quanto à reabsorção radicular externa, os examinadores apontaram que houve um incremento desta, na maioria do tipo suave e localizada na região apical, e que a radiografia digital direta foi o método radiográfico mais eficiente na determinação deste diagnóstico.In this research, the assessment of the external root resorption was carried out in endodontically treated teeth after orthodontic treatment, through the analysis of the image of the digital panoramic radiography, the digital periapical conventional and direct digital; as well as the employed methods were comparatively appraised. It was selected, after an evaluation of 2,130 orthodontic records from two centres of orthodontic studies, 20 teeth of patients with complete orthodontic records, good health conditions, age group between 25 and 50 years-old of both sexes and with front teeth (central or lateral incisor) endodontically treated before the accomplishment of the orthodontic treatment. An initial and final panoramic radiography were selected from each orthodontic record, and, later two current radiographies were obtained from each patient, one by conventional technique and the other by direct digital. After the obtaining and identification of the radiographies, the images of the digital panoramic of the digital conventional and of the direct digital were analyzed on the computer screen by three experts (an endodontist, an orthodontist and a radiologist) who evaluated whether the external root resorption was present or absent in the endodontically treated tooth after the orthodontic treatment and comparatively assessed the employed methods, verifying their reliability; they also observed the following parameters: a) periapical lesion, b) pericemental space, and c) limits of the endodontical treatment. The observations were submitted to a statistical analysis, reaching the following conclusions: 1) most of the orthodontists don\'t use periapical radiographies to evaluate endodontically treated teeth. Before the orthodontic treatment, what can compromise its course and its final results, once the root resorption doesn\'t present a symptomatology in its diagnosis; 2) as for the external root resorption, examiners claimed that there was an increment in it, most in the soft type and located in the apical area, and that the evaluation of the effectiveness of the resorption diagnosis, as well as of the other appraised parameters, indicated that the direct digital radiography obtained better outcomes regarding its identification and its classification.
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Castro, Iury Oliveira. "Avaliação da angulação e inclinação coronárias com modelos digitais em pacientes tratados ortodonticamente." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/5880.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Introduction: The incorporation of new alternatives and methods apply to the orthodontics for the analysis of crown angulation and inclination is a challenge. The contribution of tools that enable three-dimensional analysis has been gradually incorporated into dental research. Objective: This study evaluated the crown inclination and angulation of patients in orthodontic treatment using digital models and cone beam computed tomography. Methodology: With the three-dimensional cephalometric software was created cephalometric analysis to evaluate the crown angulation and inclination in digital models of 26 patients, except second and third molars. For the results of crown angulation and inclination based on Camper and Frankfurt plans were required cone beam computed tomography images. Student's t- test was used to compare the intra and inter-group averages and Pearson's correlation coefficient used to evaluate the results between the groups Camper, Frankfurt and occlusal. Results: The analysis of the reproducibility of the method did not reveal a statistically significant difference. In assessing intra-group before and after orthodontic treatment the lower lateral incisors, the lower right first molar, the canine, and the first and second premolars presented statistically significant differences in crown inclinations. The upper right first molar and the lower left molar, the lower second premolar, the lower right first premolar, and the lower lateral incisors presented statistically significant differences in angulation. In the intergroup evaluation, post treatment and prescriptions, all of the results of the crown inclination and angulation presented statistically significant differences except the crown angulation of the second superior premolars and the first inferior molars. The study shows that between the Camper-occlusal, the Camper-Frankfurt and the Frankfurt-occlusal planes, the measures of the crown inclination for incisors and canine teeth did not present a correlation and other correlations were weak or inverse. The results of the crown angulation presented a strong correlation, except for central inferior incisors and upper lateral incisors, which demonstrated a moderate correlation to the Camper-occlusal and Frankfurt-occlusal planes. Conclusion: The crown angulation and inclination can be determined by means of digital models and it is evident that there is a need for additional bend to obtain crown angulation and inclination with values close to those recommended in preset brackets. The measures of the crown angulation and inclination presented correlations when evaluated by the Camper, Frankfurt and occlusal planes with the exception of the crown inclination of the incisors and canine teeth.
Introdução: A incorporação de novas alternativas e métodos aplicáveis à ortodontia para a análise da angulação e inclinação coronária constitui um verdadeiro desafio. A contribuição de ferramentas que permitem análises tridimensionais tem sido gradativamente incorporada à pesquisa odontológica. Objetivo: O presente estudo avaliou a inclinação e a angulação coronária em pacientes tratados ortodonticamente usando modelos digitais e tomografia computadorizada de feixe cônico. Metodologia: Com o módulo de cefalometria tridimensional do Software VistaDent 3D foi criado análise cefalométrica para avaliar a inclinação e angulação coronária em modelos digitais de 26 pacientes, exceto segundos e terceiros molares. Para obter os resultados de angulação e inclinação coronária com base nos planos de Camper e Frankfurt, foram necessárias documentações de pacientes com imagens tomográficas finais. Foi utilizado o teste t-Student para comparar as médias intra e intergrupo e o coeficiente de correlação de Pearson para avaliar os resultados entre os grupos Camper, Frankfurt e oclusal. Resultados: A análise da reprodutibilidade do método não revelou diferença estatisticamente significante. Quanto à avaliação intragrupo, antes e depois do tratamento ortodôntico, os incisivos laterais inferiores, primeiro molar inferior direito, os caninos, primeiros e segundos pré-molares apresentaram diferenças estatisticamente significantes para inclinações. Primeiro molar superior direito e inferior esquerdo, segundos pré-molares inferiores, primeiro premolar inferior direito e incisivos laterais inferiores apresentaram diferenças estatisticamente significantes para angulações. Quanto à avaliação intergrupo, depois do tratamento ortodontico e prescrições, todos os resultados de inclinação e angulação apresentaram diferenças estatisticamente significantes, exceto a angulação dos segundos pré-molares superiores e primeiros molares inferiores. O estudo aponta que entre os planos Camper-oclusal, Camper-Frankfurt e Frankfurt-oclusal as medidas de inclinação coronária para incisivos e caninos não apresentaram correlação, outros correlação fraca ou inversa. Os resultados da angulação coronária apresentaram forte correlação, exceto incisivos centrais inferiores e laterais superiores que demonstraram moderada correlação para Camper-oclusal e Frankfurt-oclusal. Conclusão: A angulação e inclinação coronária podem ser mensuradas por meio de modelos digitais e os resultados sugerem a necessidade de dobras adicionais no fio ortodôntico para obtenção de angulação e inclinação coronária com valores próximos aos preconizados em braquetes pré-ajustados. As medidas de angulação e inclinação coronárias apresentaram correlacionadas quando avaliadas pelos planos de Camper, Frankfurt e oclusal, exceto a inclinação dos incisivos e caninos.
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FARRONATO, MARCO. "TECHNOLOGICAL BREAKTHROUGH TOWARDS THE USE OF A NOVEL VISUAL-INERTIAL ODOMETRY SYSTEM AS AN AID FOR THE DIGITALLY-GUIDED INTERVENTION." Doctoral thesis, Università degli Studi di Milano, 2022. https://hdl.handle.net/2434/948169.
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Recent data availability of three dimensional imaging brought new possibilities for the guided intervention. The management of complex data requires the use of new tools and new technologies. We analyzed the use of algorithms for the automatic, ai-driven segmentation to extrapolate the best systems for the use of CBCTs. The tool improves the timing and precision of the segmentation and allows to give normal values for the cephalometry. The segmented data can be analyzed through three dimensional alignment, the new techniques will be explored for data synthesis. Finally three dimensional resulting datasets can be exported and used to virtually plan an intervention. After the plan is complete they can be used to bring the clinician a new powerful system for the AR guided intervention. Clinical and research data results and outcomes will be given, bringing both preliminary as well as multidisciplinary researchers in the field of: orthodontics, endodontics and oral surgery with clinical direct performances and results.
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Raphy, Puthri. "The use of QLF-DTM (Quantitative Light-induced Fluorescence-Digital TM) as an oral hygiene evaluation tool to assess plaque accumulation and enamel demineralisation in pre-orthodontic patients with suboptimal oral hygiene." Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3017969/.
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Aim: To assess the use of the Quantitative Light-induced Fluorescence-Digital Biluminator TM (QLF-DTM) as an oral hygiene evaluation tool to assess plaque accumulation and demineralisation in patients with poor oral hygiene. Design: Randomised clinical trial Settings: Liverpool University Dental Hospital Subjects: 60 patients (32 females, 28 males) with inadequate oral hygiene referred to dentists or hygienists for oral hygiene reinforcement before the start of orthodontic treatment were recruited for the trial. The median age of patients was 13.8 years with an IQR range from 11.1 to 26.7 years. Methods: The patients were randomly allocated at baseline (T1) to receive oral hygiene reinforcement (OHR) at three consecutive appointments (T1-T3) using the White light (WL) or Quantitative Light-induced Fluorescence (QLF) images, taken with the QLF-DTM device (Inspektor Research Systems BV, Amsterdam, The Netherlands), as visual aids. The standard of oral hygiene was assessed on the QLF images using customised software to provide quantitative scoring of fluorescence loss (ΔF) and plaque coverage (ΔR30) at each appointment. Inter-examiner reliability assessments were conducted by four examiners using QLF and WL images from 35 images of 7 patients. One examiner assessed the images on a second occasion two months later to ascertain the intra-examiner reliability. A debriefing questionnaire, distributed on completion of the study, was used to ascertain the patients’ perspectives of the QLF-DTM images. Results: There were no significant differences in plaque accumulation (p=0.81) or demineralisation (P=0.69) between the WL and QLF groups. There was no significant change in demineralisation over the three visits in either group. However, there was a significant reduction in plaque in both groups (P < 0.001) with a mean percentage change in R30 of 51.8% and 95% CI of 40.36% to 63.26%. All of the participants in the QLF group found being shown the images helpful and were able to see areas of demineralisation and plaque accumulation. 92.5% of the QLF group and 76.7% of the WL group expressed it would be useful to receive such OHR for the full duration of orthodontic treatment. The inter-examiner reliability of QLF image assessment, using ICC, was 0.987 and 0.773 for ΔR30 and ΔF respectively. The inter-examiner reliability of WL image assessment, using kappa, ranged from -0.0932 to 0.447. The intra-examiner reliability scores were excellent with an ICC of 1.0 and 0.995 for ΔR30 and ΔF respectively on the QLF images. The kappa score of demineralisation assessment on the WL images was 1.0. Conclusion: QLF-DTM can be used as an effective tool to assess plaque accumulation and detect and monitor demineralisation in patients with suboptimal oral hygiene to start orthodontic treatment. The image analysis demonstrated high levels of inter- and intra-examiner reliability. OHR using WL or QLF images as visual aids was effective in reducing plaque coverage in patients with suboptimal oral hygiene. There was no difference in the level of demineralisation or plaque coverage between the QLF and WL groups. More patients reported that the QLF images were useful than patients shown WL images. Summary: OHR using WL or QLF images was an effective tool in reducing plaque in poor OH patients and reported QLF images were informative.
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Navarro, Jugo Eddy Eder. "Avaliação das alterações anteroposterior e transversal produzidas pelo uso dos aparelhos funcionais Bionator e Klammt no tratamento da má oclusão de Classe II, divisão 1 de Angle, por meio de modelos digitais /." Araraquara, 2018. http://hdl.handle.net/11449/155937.
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Orientador: Ary dos Santos PintoResumo: O objetivo de evitar a progressão da má oclusão e propiciar um crescimento craniofacial mais harmonioso. Os ativadores monoblocos e elásticos induzem o posicionamento terapêutico anterior da mandíbula para correção da má oclusão de Classe II podendo expandir ou não as arcadas dentárias para melhorar a forma dos arcos e promover o alinhamento dentário. O objetivo deste estudo foi avaliar os efeitos do tratamento ortopédico funcional, sobre as relações anteroposteriores e transversais dos arcos dentários no tratamento da má oclusão de classe II com dois tipos de aparelhos ortopédicos funcionais, o Bionator de Balters e o Ativador elástico de Klammt utilizando modelos de estudo digitais. Foram coletadas as documentações ortodônticas de 15 indivíduos com má oclusão de Classe II divisão 1 acompanhados pelo período de 1 ano sem tratamento (grupo controle) e de 30 indivíduos com má oclusão de Classe II divisão 1 tratados com os dois tipos de aparelhos ortopédicos funcionais e acompanhados pelo período de 1 ano (grupo tratado). Modelos em gesso iniciais e após 1 ano de controle ou tratamento foram digitalizados no Scanner 3D R700 e obtidas as medidas de relação oclusal interarcos e das dimensões dos arcos com auxílio do software 3Shape's OrthoAnalyzer™ Advanced Orthodontic Diagnosis and Treatment Planning. As medidas obtidas foram transferidas para o programa SPSS (versão16, SPSS, Chicago, Ill) para análise estatística. Trabalho 1: O tratamento com o aparelho Bionator pode promover r... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The objective to avoid the progression of the malocclusion and enable a more harmonious craniofacial growth. The monobloc and the elastic activator induce the mandible to an anterior therapeutic positioning to treat the Class II malocclusion and have different capabilities to expand or not the dental arches to improve the arch form and to promote the dental aligns. The aim of this study was to evaluate the differences in the antero-posterior and transverse dental arch relationship after orthopedic treatment of the Class II malocclusion two types of functional orthopedic appliances (Bionator of Balters and Elastic activator of Klammt) using digital study models. Orthodontic dental records of 15 individuals Class II division 1 malocclusion followed for one year without treatment (control group) and 30 individuals with Class II division 1 malocclusion treated with the two functional orthopedic appliances (Bionator of Balters and Elastic activator of Klammt) and followed for one year (treated group). Initial and final dental casts of these individuals will be digitalized in the 3D R700 Scanner and measurements of the interarch occlusal relationship and of the dimensions of arches were evaluated. The data was assessed through Descriptive Statistic and t test and analysis of variance (anova) statistical analysis. Paper 1: The treatment with the Bionator device can promote a significant reduction in the lower arch perimeter, with an increase in the lower incisor irregularity (increa... (Complete abstract click electronic access below)
Mestre
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Dias, Fernando Henrique Trigueiro. "Avaliação das alterações dentoesqueléticas de jovens com má oclusão de Classe II tratados com aparelho distalizador First Class Modificado, utilizando modelos digitais e análise cefalométrica." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25144/tde-14082013-091203/.
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O objetivo deste estudo foi avaliar as alterações dentoesqueléticas, tegumentares e transversais do arco superior de jovens com má oclusão de Classe II predominantemente dentária, tratados com o distalizador First Class em ancoragem convencional e esquelética. A amostra foi composta por 30 pacientes divididos em três grupos com 10 pacientes cada, nomeados G1 (ancoragem convencional), G2 (ancoragem esquelética) e G3 (modificado com ancoragem squelética). As telerradiografias laterais, para todos os grupos, e os modelos de documentação, para G2 e G3, foram obtidos antes e após a distalização dos molares sendo posteriormente digitalizados para a realização da análise cefalométrica e de modelos digitais. Os dados foram analisados por meio dos testes t pareado, para verificar as alterações produzidas em um mesmo grupo nos tempos inicial e pós distalização, e ANOVA seguido do Teste de Tukey para verificar as diferenças entre os grupos, para dados com distribuição não normal foram utilizados os testes de Wilcoxon e Kruskal-Wallis. O tempo médio de tratamento foi de 4,62 meses para o G1; 5,41 meses para o G2 e 3,91 meses para o G3, não havendo diferença entre eles. A análise dos primeiros molares demonstrou que todos os grupos presentaram alterações dentárias significantes na angulação (G1= -8,42o; G2= -5,98o; G3= - 6,12o), apenas os grupos G1 e G3 (G1= -1,63 mm; G2= -1,31 mm; G3= - 1,91 mm) apresentaram alterações significantes na distalização e não foram detectadas alterações verticais (G1= -1,63 mm; G2= -1,31 mm; G3= -1,91 mm). A perda de ancoragem anterior foi significantemente menor para os valores angulares no G3 demonstrando uma suave vestibularização dos incisivos centrais (G1= 4,76o; G2= 4,49o; G3= 0,64o) e menor angulação mesial dos segundos pré-molares (G1= 6,69o; G2= 10,29o; G3= 3,55o), não havendo diferenças entre os grupos para os componentes lineares horizontais (G1= 1,77 mm; G2= 1,72 mm; G3= 1,05 mm) e verticais (G1= -0,17 mm; G2= -0,02 mm; G3= 0,31mm) dos incisivos e lineares horizontais (G1= 2,88 mm; G2= 3,19 mm; G3= 2,43 mm) e verticais (G1= 0,37 mm; G2= 0,63 mm; G3= 0,95 mm) dos segundos pré-molares. A distalização promoveu ainda um aumento mais acentuado da AFAI para o G3 (G1= 0,49 mm; G2= 1,20 mm; G3= 1,71 mm) e uma menor alteração do ANL também para o G3 (G1= -4,71o; G2= -2,82º; G3= 0,42o). A análise dos modelos digitais demonstrou diferença significante apenas para a distância entre segundos pré-molares (G2= -2,14 mm; G3= -1,10 mm). Todos os aparelhos estudados são eficazes para realizar a correção da relação molar promovendo uma perda de ancoragem anterior, sendo este efeito indesejado menor para o distalizador First Class modificado associado à ancoragem esquelética.The aim of this study was to evaluate the dentoskeletal, soft tissue and maxillary transverse dimensions changes in youngsters with dental Class II malocclusion treated with First Class distalizer in skeletal and conventional anchorage. Thirty patients were included and divided in three groups of 10 patients each, named G1 (conventional anchorage), G2 (skeletal anchorage) and G3 (modified First Class with skeletal anchorage). Lateral radiographs, for all groups, and dental casts, for G2 and G3, were obtained before and after molar distalization and subsequently scanned to perform cephalometric and digital models analysis. Data were analyzed using paired t tests to verify the same group changes at initial and after distalization time, and ANOVA followed by Tukey test to detect differences between groups, for data with non-normal distribution were used Wilcoxon and Kruskal-Wallis tests. No difference was found in treatment time (G1= 4.62 months, G2= 5.41 months, G3= 3.91 months). First molars analysis showed that all groups had significant dental angulation changes (G1= -8.42o, G2= -5.98o, G3= -6.12°), G1 an d G3 showed significant distalization changes (G1= -1.63 mm, G2= -1.31 mm; G3= - 1.91 mm) and no vertical changes were detected (G1= -1.63 mm, G2= -1.31 mm, G3= -1.91 mm). Anchorage loss was significantly smaller to the G3 angular measurements, demonstrating a little incisors vestibularization (G1= 4.76o, G2= 4.49o, G3= 0.64o) and little second premolars mesial angulation (G1= 6.69o, G2= 10.29o, G3= 3.55o), with no horizontal linear changes (G1= 1.77 mm, G2= 1.72 mm, G3= 1.05 mm) and no vertical linear differences between groups (G1= -0.17 mm , G2= -0.02 mm, G3= 0.31 mm) of incisors and horizontal linear (G1= 2.88 mm, G2= 3.19 mm, G3= 2,43 mm) and vertical (G1= 0.37 mm, G2= 0.63 mm, G3= 0.95 mm) of the second premolars. Distalization increased the LAFH to G3 (G1= 0.49 mm, G2= 1.20 mm, G3= 1.71 mm) and also promoted changes in G3 NLA (G1= -4.71o, G2= -2.82o, G3= 0.42°). Digital models analysis showed a significant difference only for the second premolars transverse dimension (G2 = -2.14 mm; G3= -1.10 mm). All devices studied were effective to perform the molar relationship correction, resulting an anchorage loss, this unwanted effect was lesser with modified First Class distalizer with skeletal anchorage.
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Lin, Jian-Cheng, and 林建誠. "The Research on Spatial Motion of Orthodontics Digital Data." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/02571721375674815006.
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碩士崑山科技大學
機械工程研究所
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First procedure in the the traditional dentures production process making dentures is completed and has been translated into a plaster mold of the model obtained from the patient''s mouth, then after manually processing this plaster model into a compliant base size, shape andimplanted with a plaster model of the nail, and then continue to follow-up the procedures.As a lot of manpower and time spent in this program. Occlusal dental clinic crown, dental bridge making is a very important tool, as well as the orthodontic physician can calculate the size of the teeth on the model, the space requirements of the analysis, and simulation of the upper and lower jaw occlusion, and then set the best the treatment plan. As has become the trend of the development of computer-aided design, the use of digitized information for treatment planning physicians and patients a bridge. The purpose of this study is to construct a set of digital technology tooth mold occlusion and treatment planning software in this paper to assist physicians 3D digital tooth mold bite and correction planning to meet the clinical demand.
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Rykiss, Jared. "Digital analysis of staining properties of clear aesthetic brackets." 2011. http://hdl.handle.net/1993/4922.
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AIM: To analyze staining properties of aesthetic brackets.
MATERIAL & METHODS: A total of 400 tooth-coloured brackets from 10 brands 5 ceramic and 5 plastic) were investigated. Cumulative effects of staining agents were analyzed at simulated light and heavy consumption levels. Study groups were immersed in the staining agents consecutively at 37°C. The control group was exposed to artificial saliva. Samples were analyzed digitally to obtain the L*, a*, and b* (lightness, red-green, and yellow-blue) colour readings. Using these values total colour change (ΔE*) was also calculated. A general linear model (ANOVA) test was used for statistical comparisons.
RESULTS: Significant differences were observed in L*, and b* values of ceramic brackets at all consumption levels (p≤.0001). All values had significant differences amongst the plastic brackets (p≤.0001), except for L* with heavy exposure. Total ΔE* values for ceramic and plastic brackets were 11 and 26, respectively.
CONCLUSIONS: Both plastic and ceramic brackets showed changes in colour when exposed to staining agents, with plastic brackets being the most affected.
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Lands, Bradley. "The accuracy and reliability of plaster vs digital study models : a comparison of three different impression materials." Thèse, 2010. http://hdl.handle.net/1866/4150.
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Introduction: Le but de l’étude était d’examiner l’effet des matériaux à empreintes sur la précision et la fiabilité des modèles d’études numériques. Méthodes: Vingt-cinq paires de modèles en plâtre ont été choisies au hasard parmi les dossiers de la clinique d’orthodontie de l’Université de Montréal. Une empreinte en alginate (Kromopan 100), une empreinte en substitut d’alginate (Alginot), et une empreinte en PVS (Aquasil) ont été prises de chaque arcade pour tous les patients. Les empreintes ont été envoyées chez Orthobyte pour la coulée des modèles en plâtre et la numérisation des modèles numériques. Les analyses de Bolton 6 et 12, leurs mesures constituantes, le surplomb vertical (overbite), le surplomb horizontal (overjet) et la longueur d’arcade ont été utilisés pour comparaisons. Résultats : La corrélation entre mesures répétées était de bonne à excellente pour les modèles en plâtre et pour les modèles numériques. La tendance voulait que les mesures répétées sur les modèles en plâtre furent plus fiables. Il existait des différences statistiquement significatives pour l’analyse de Bolton 12, pour la longueur d’arcade mandibulaire, et pour le chevauchement mandibulaire, ce pour tous les matériaux à empreintes. La tendance observée fut que les mesures sur les modèles en plâtre étaient plus petites pour l’analyse de Bolton 12 mais plus grandes pour la longueur d’arcade et pour le chevauchement mandibulaire. Malgré les différences statistiquement significatives trouvées, ces différences n’avaient aucune signification clinique. Conclusions : La précision et la fiabilité du logiciel pour l’analyse complète des modèles numériques sont cliniquement acceptables quand on les compare avec les résultats de l’analyse traditionnelle sur modèles en plâtre.Introduction: The purpose of this study was to examine the effects of different impression materials on the accuracy and reliability of digital models. Methods: Models from 25 patients selected at random from the files of the Department of Orthodontics at the University of Montreal were used in this study. One alginate (Kromopan 100 alginate, Italy), 1 alginate alternative (Alginot, Kerr Dentistry, Orange, CA), and 1 PVS (Aquasil, Dentsply Caulk, Milford, DE) impression was taken of both arches of each patient and sent to Orthobyte (Othobyte Digital Technology inc., Calgary, AB) for fabrication of a plaster model and scanning for production of a digital model. The Bolton 6 and 12 analyses and their constituent measurements, overbite, overjet, and arch length were used for the comparison. Results: The repeatability of measurements using both the plaster and digital methods was good to excellent, with the plaster measurements tending to be more reliable. There were statistically significant differences in the Bolton 12 and mandibular arch length and spacing measurements for all impression materials, with the plaster models tending to give a smaller measurement for the Bolton 12 and a higher measurement for the mandibular arch length and spacing. Although statistically significant differences in some measurements were found for the reliability and validity of digital models, none was clinically significant. Conclusions: The accuracy and reliability of the software for comprehensive cast analysis is clinically acceptable and reproducible when compared with traditional plaster study model analysis.
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Péloquin, Vincent-Claude. "Validité, fiabilité et reproductibilité des modèles digitaux obtenus avec iTero (Align Technology) et Unitek TMP Digital (3M) en comparaison avec les modèles de plâtre." Thèse, 2015. http://hdl.handle.net/1866/13102.
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Objectif: L'objectif primaire de cette étude était d'évaluer la validité, la fiabilité et la reproductibilité des mesures dentaires obtenues sur les modèles digitaux iTero (Align Technology, San Jose, Californie) et Unitek TMP Digital (3M, Monrovia, Californie) en comparaison avec celles obtenues sur les modèles de plâtre (gold standard). L'objectif secondaire était de comparer les deux différents matériaux à empreinte (l'alginate et le polyvinylsiloxane-PVS) afin de déterminer si le choix du matériau affectait la précision des mesures.
Méthodes: Le premier volet de l'étude impliquait les modèles digitaux Unitek et iTero, obtenus à partir de 25 paires de modèles de plâtre choisis de façon randomisée et provenant de la pratique privée d'un des co-auteurs. Des empreintes d'alginate et de PVS ont été prises sur les modèles de plâtre et numérisées par le scanner Unitek. Les modèles ont ensuite été numérisés avec le scanner iTero. Le deuxième volet de l'étude cherchait à comparer les modèles digitaux iTero (numérisation intra-orale) avec les modèles de plâtre (empreintes d'alginate et de PVS) obtenus à partir de 25 patients de la clinique d'orthodontie de l'Université de Montréal ayant besoin d'un traitement orthodontique. Dans les deux volets de l'étude, deux auteurs ont pris les mesures suivantes sur les différents modèles: largeur mésio-distale de chaque dent de la première molaire à l'autre première molaire, le périmètre d'arcade, les distances intermolaire et intercanine, le surplomb vertical et le surplomb horizontal. Les ratios et excès Bolton 6 et 12, l'espace requis et les différentiels d'espace au maxillaire et à la mandibule, ont été calculés.
Résultats: La fiabilité (ICC) entre les modèles digitaux (Unitek et iTero) et les modèles de plâtre était bonne à excellente pour toutes les mesures [ICC=0,762–0,998], et la fiabilité entre les deux matériaux à empreinte était excellente [ICC=0,947–0,996]. Dans les deux volets de l'étude, les mesures faites sur les modèles iTero étaient généralement plus grandes que celles faites sur les modèles de plâtre. Les plus grandes différences moyennes pour la comparaison iTero-plâtre étaient trouvées au niveau de l'espace disponible au maxillaire et à la mandibule (systématiquement plus grande pour cette variable), soit 2,24 mm et 2,02 mm respectivement dans le premier volet, et 1,17 mm et 1,39 mm respectivement dans le deuxième volet. Les différences étaient considérées cliniquement non significatives pour toutes les variables. La reproductibilité intra-examinateur était bonne à excellente pour les modèles de plâtre et les modèles digitaux, à l'exception du différentiel d'espace à la mandibule pour les modèles Unitek [ICC=0,690-0,692]. La reproductibilité inter-examinateur était bonne à excellente pour les modèles de plâtre et les modèles digitaux dans les deux volets de l'étude, mais acceptable à modérée pour les modèles Unitek au niveau des analyses Bolton 6 et 12, et des différentiels d'espace au maxillaire et à la mandibule [ICC=0,362-0,548].
Conclusions: La précision et la fiabilité des mesures dentaires faites sur les modèles digitaux Unitek et iTero étaient cliniquement acceptables et reproductibles en comparaison avec les celles faites sur les modèles de plâtre. Le choix de matériel à empreinte entre l'alginate et le PVS n'affectait pas la précision des mesures. Cette étude semble démontrer que les modèles digitaux Unitek et iTero, utilisés avec leur logiciel respectif, sont une alternative fiable et reproductible aux modèles de plâtre pour le diagnostic et l’analyse des modèles orthodontiques.Objective: The primary objective of this study was to evaluate the validity, reliability and reproducibility of dental measurements obtained on digital models produced by iTero (Align Technology, San Jose, California) and by Unitek TMP Digital (3M, Monrovia, California) in comparison with those obtained on plaster models (gold standard). The secondary objective was to compare two different impression materials (alginate and polyvinylsiloxane-PVS) to determine whether the material used affects accuracy of the measurements. Methods: The first part of the study involved Unitek and iTero digital models, which were all obtained from 25 pairs of plaster models randomly selected from one of the co-author's private practice. Alginate and PVS impressions were taken on plaster models and were scanned by the Unitek scanner. The same models were then scanned with the iTero scanner. The second part of the study sought to compare iTero digital models (intraoral scans) with plaster models (alginate and PVS impressions) taken on 25 patients requiring treatment from the Orthodontic clinic of the University of Montreal. In both parts of the study, two authors took the following measurements on the different models: mesio-distal width of each tooth from first molar to the other first molar, intermolar and intercanine distances, overbite and overjet. Bolton 6 and 12 ratios and excesses, maxillary and mandibular space available and required were also calculated in order to determine space differentials. Results: A good to excellent reliability (ICC) was found for all measurements when comparing digital (Unitek and iTero) and plaster models [ICC=0.762–0.998], and excellent reliability when comparing both impression materials [ICC=0.947–0.996]. In the two parts of the study, measurements on iTero models were generally larger than on plaster models. Highest mean differences for iTero-plaster were found for maxillary space available and mandibular space available (systematically larger for that variable): 2.24 mm and 2.02 mm respectively in the first part of the study, 1.17 mm and 1.39 mm respectively in the second part. Differences were considered clinically insignificant for all variables. Intraexaminer reproducibility was good to excellent for plaster and digital models, except for mandibular space differential on Unitek models [ICC=0.690-0.692]. Interexaminer reproducibility was good to excellent for plaster and digital models in both parts of study, but fair to moderate for Unitek models regarding Bolton 6 and 12, and maxillary and mandibular space differentials [ICC=0.362-0.548]. Conclusions: The accuracy and reliability of dental measurements done on Unitek and iTero digital models were clinically acceptable and reproducible when compared with measurements done on traditional plaster models. The choice of impression material between alginate and PVS did not affect accuracy of the measurements. This study tends to indicate that Unitek and iTero digital models examined with their associated software can be reliably used for orthodontic cast analysis and diagnosis.
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Triki, Sonia. "Interesse dos modelos digitais em ortodontia: revisão narrativa." Master's thesis, 2021. http://hdl.handle.net/10284/10349.
Full textAbstract:
A introdução dos modelos digitais em Ortodontia, apresenta diversas vantagens como a precisão e rapidez na obtenção de dados para o diagnostico, facilidade de armazenamento, possibilidade de transferência de informações através dos meios de comunicação virtual, maior facilidade de realização da análise ortodôntica e confeção de modelos virtuais. Eles permitem o desenvolvimento de novos recursos de tratamento como a confeção de alinhadores termoplásticas, e a individualização dos brackets.
Este trabalho objetiva, por meio de uma revisão da literatura, demonstrar o interesse dos modelos digitais em Ortodontia. Para tal foi efetuada uma pesquisa bibliográfica entre setembro de 2020 até maio de 2021, procedeu-se uma pesquisa bibliográfica de artigos científicos, recorrendo a diversos motores de busca e bases de dados utilizando como palavras-chave: Ortodontics, digital model, new technology.
Conclui-se que as principais vantagens do modelo digital comparado com os modelos de gesso são: a possibilidade de transferência de informações através dos meios de comunicação virtual e a facilidade de armazenamento.The introduction of digital models in Orthodontics has several advantages such as accuracy and speed in obtaining data for diagnosis, ease of storage, possibility of transferring information through virtual means of communication, greater ease in carrying out orthodontic analysis and making virtual configuration. They allow the development of new treatment resources such as the making of thermoplastic aligners, and bracket customization. This work aims, through a literature review, to present the interest of digital models in Orthodontics. The research was carried out between September 2020 and May 2021, a bibliographical search of scientific article was carried out using several search engines and databases using as keywords: Orthodontics, digital model, new technology. It is concluded that the main advantages of the digital model compared to plaster models are: the possibility of transferring information through virtual means of communication and the ease of storage.
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Devita, Renan Lana. "A regeneração óssea e o planeamento reverso em implantodontia associados à ortodontia corretiva." Master's thesis, 2019. http://hdl.handle.net/10284/8353.
Full textAbstract:
Pacientes adultos edêntulos parciais com má oclusão podem necessitar de uma reabilitação oral multidisciplinar com tratamento clínico geral, ortodontia, regeneração óssea, implantodontia e odontologia estética. A associação de uma tomografia computadorizada de feixe cônico do crânio com fotografias e escaneamentos intra e extra orais carregados em um software tridimensional de planeamento digital permitem um diagnóstico mais completo e a simulação de diferentes planos de tratamento. Assim, quando possível, a antecipação da regeneração óssea das futuras áreas de instalação de implantes dentários pode diminuir o tempo total da reabilitação oral multidisciplinar. Com o objetivo de coletar informações sobre a conduta clínica em casos que envolvam tratamento ortodôntico e regeneração óssea para a instalação de implantes dentários foi enviado um questionário a cirurgiões-dentistas registrados simultaneamente como especialistas em ortodontia e em implantodontia no Conselho Federal de Odontologia do Brasil. Perguntas sobre protocolos diagnósticos, qual o sítio de maior complexidade e qual o melhor momento do tratamento ortodôntico para a realização de cirurgias de regeneração óssea e qual o tempo mínimo de espera para se reabilitar uma área enxertada fizeram parte do questionário. Os resultados deste estudo se baseiam na opinião e na experiência clínica dos especialistas que responderam o questionário. Portanto podem servir de referência quando se planea uma reabilitação oral multidisciplinar para um paciente adulto edêntulo parcial com má oclusão para a obtenção de uma oclusão estável, estética oral e harmonia facial.Partially edentulous adult patients with malocclusion may require multidisciplinary oral rehabilitation with general clinical treatment, orthodontics, bone regeneration, dental implants and aesthetic dentistry. The association of a skull cone beam computed tomography, intra and extra oral photographs and scans uploaded in a three dimensional digital planning software allow a more complete diagnosis and simulation of different treatment plans. Thus, when possible, the anticipation of bone regeneration of future dental implant placement areas may decrease the total time of multidisciplinary oral rehabilitation. With the objective of collecting information about the clinical conduct in cases that involve orthodontic treatment and bone regeneration for the placement of dental implants, a questionnaire was sent to dentists registered as specialists at the same time in orthodontics and implantology at the Federal Dental Council of Brazil. Questions about diagnostic protocols, which is the most complex site and which is the best moment of orthodontic treatment to perform bone regeneration surgeries and which is the minimum waiting time to rehabilitate a grafted area were part of the questionnaire. The results of this study are based on the opinion and experience of the specialists who answered the questionnaire. Therefore, they can serve as a reference when planning a multidisciplinary oral rehabilitation for a partially edentulous adult patient with malocclusion to obtain a stable occlusion, oral aesthetic and facial harmony.
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Hui-ChiWei and 魏卉齊. "Implementation Strategy of Digital Orthodontic Service Process." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/38bab5.
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Chang, Akyla, and 張國忠. "Development of an orthodontic system on 3D digital models." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/84642438174532828589.
Full textAbstract:
碩士國立臺灣科技大學
機械工程系
93
This thesis proposes an approach to improving the traditional procedure of making invisible tooth aligners. The technique of computer-aided design is also employed to simulate the alignment process of the entire orthodontic procedure. The goal is to replace the tedious, manual tooth-alignment operations on the dental model, so that a dentist can form an appropriate orthodontic treatment plan in the early stage of tooth-treatment. The computer-aided orthodontic system developed in this thesis includes the following steps: (1) load the scanned point-data of the dental model, (2) divide the entire tooth point-data into individual teeth, (3) for each tooth, manually label a line-segment which represents the geometry of the tooth, (4) find a dental arch based on the line-segments and related parameters, (5) align the line-segments to match the dental arch to achieve the tooth alignment function, and (6) use the dental model as the basis to conduct the making of a series of invisible tooth aligners. In addition to proposing the methodology of orthodontic treatment, this thesis uses Visual C++, MFC and OpenGL to develop a Windows-based orthodontic system that can be used in real-life dental practice. Dental experiments are also conducted and depicted in the thesis to verify the feasibility of the developed system.
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TSAI, BO-CHENG, and 蔡博丞. "Rapid Automatic Tooth Arrangement Applied to Orthodontic and Digital Dentistry." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6qy2jw.
Full textAbstract:
碩士國立中正大學
機械工程系研究所
106
Orthodontic treatment hope to use a simplest way reach a correct occlusion and aesthetic goal in a short time. Therefore, this thesis develops a rapid automated tooth arrangement algorithm based on the orthodontists’ experience and the knowledge of orthodontics, consider the information of tooth root to prevent them from protruding out of alveolar bone. To start with, getting the personal tooth information through the automatic search of dental feature, dental arch identification and tooth inclined angle. Then, correspond the dental feature to the dental arch and align tooth to dental arch using the Levenberg–Marquardt algorithm. Next, establish correct occlusion through the maxillary and mandibular bite characteristic of correspondence, check the collision detection with opposing and adjacent tooth ,and iterative until all the tooth are aligned in order to the goal of orthodontics. In the end, results will be checked by fine adjustment. The process takes about ten minutes, which significantly shortens the planning time compare with the manual digital tooth arrangement, and the automatic arrangement results are similar to the manual arrangement.
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Jiang, Chang-Yang, and 江長陽. "Comparison of the orthodontic diagnostic measurements between digital and conventional dental models." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/74151374882630453121.
Full textAbstract:
碩士中國醫藥大學
臨床醫學研究所碩士班
98
Same as medicine, orthodontic doctors needed to collect lots of patients’ data to conclude the problem list. Then, they could decide the diagnosis and the treatment plan. The data collected might be from the questionnaire and interview, clinic examinations, and diagnostic records. Along with the development of computer technique, digitization was a trend unable to stop. Now, most medical records were recorded, stored and managed in digital form. For orthodontic diagnosis and treatment plan, digital photography and digital radiography had been taken many years. The digital dental models developed recently might replace the cast models in dentistry. The purpose of this study was to assess the difference between the digital dental models and cast models, and the possibility that the digital replace the cast models. 28 sets of cast models were scanned using the VIVID 9i laser digitizer. The digital model were produced and measured by the Rapidform 2006 software. 14 parameters were measured and the study was divided into 2 groups (intra-examiner and inter-examiner). The results were analyzed by paired t test and the P value was 0.05. The result of intra-examiner group indicated that there was no significant difference in most parameters between digital models and cast models. The result of inter-examiner group indicated that there was significant difference in almost 1/3 parameters between digital models and cast models. Comparing to cast models, there were lots of advantage using digital models. But the equipments were too expensive. In inter-examiner group, although there was significant difference between digital models and cast models, the difference among examiners was lager. That indicated the difference was not clinically significant. Measuring tools and the quality of images were the main cause of the difference between digital models and cast models. According to the parameters we measured, digital models and cast models were not clinic different.
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Schiano, Frank Edwin. "Student learning of simple orthodontic model analysis using plaster and digital casts." Thesis, 2018. https://hdl.handle.net/2144/33271.
Full textAbstract:
INTRODUCTION: Cast analysis plays an essential role in orthodontic diagnosis. Intraoral scanning to produce digital models is a relatively new but increasingly common practice in graduate orthodontic programs. It is unknown how incorporating digital models in post graduate orthodontic programs will influence student learning of model analysis. The purpose of this study was to investigate the possible differences in learning speed and accuracy of basic orthodontic model analysis using digital models or traditional plaster casts.
MATERIALS/METHODS: Two groups of senior dental students participated, one for each mode of cast analysis. A study moderator provided a 15-minute tutorial instructing participants on how to analyze the casts. A standardized scoring sheet was used for data collection. Each group was given five sets of orthodontic models to measure the following parameters: Right molar occlusion, overbite, overjet, arch length, required arch space, crowding, and incisor irregularity. The accuracy of the measurements as well as the time taken to complete all measurements on each model were recorded. Learning as measured by increasing accuracy or decreased time over the group of five casts was determined. Five orthodontic faculty served as the control group.
RESULTS: Twenty-five students analyzed plaster casts; forty students analyzed digital casts. Molar occlusion was judged as either correct or incorrect; means of the millimetric measurements of the other parameters were compared between groups using general linear modeling. The digital learning group had 15 measurements that were significantly different from the faculty mean; the plaster learning group had only 2 (p<0.05). Regarding molar occlusion, the plaster group was always more accurate. The time required for the measurements decreased in each group to a similar extent, with the greatest decrease between digital casts 1 and 2.
CONCLUSIONS: Senior dental students learned how to analyze plaster orthodontic models more accurately than digital casts. The time required for analysis decreased over 5 trials, but was not significantly different between the groups.
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Lagravère, Vich Manuel O. "Analysis of skeletal and dental changes with a tooth-borne and a bone-borne maxillary expansion appliance assessed through digital volumetric imaging." 2009. http://hdl.handle.net/10048/504.
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Thesis (Ph.D.)--University of Alberta, 2009.A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Medical Sciences - Orthodontics. Title from pdf file main screen (viewed on August 16, 2009). Includes bibliographical references.
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Boulos, Colette. "Analyse occlusale informatisée, sur une période de six mois post-traitement, comparant des cas traités par orthodontie fixe et par aligneurs amovibles." Thesis, 2020. http://hdl.handle.net/1866/24437.
Full textAbstract:
Objectif: Suite aux traitements avec aligneurs, une insuffisance de contacts postérieurs est souvent notée cliniquement: existe-t-elle réellement, se corrige-t-elle spontanément? Cette étude vise à comparer la qualité de l’occlusion statique chez des patients ayant été traités avec boitiers conventionnels ou par aligneurs, dès la dépose des appareils orthodontiques et après six mois de mise en place fonctionnelle.
Matériel and Méthodes: La mise en place fonctionnelle de l’occlusion chez des sujets traités par boitiers conventionnels (GB, n=25) ou par aligneurs (GA, n=14) et par a été évaluée par un système d’analyse occlusale informatisée (T-scan 9), au moment de la dépose (T0), puis à 3 et 6 mois de contention (T3 et T6). Les sujets (41% de filles, âge moyenne de 19,38 ± 5,98 ans), étaient traités sans extractions, ni chirurgie, avec pour contention des fils collés ou appareils sans recouvrement occlusal. La symétrie et la simultanéité des contacts ainsi que la position antéro-postérieure du centre de forces (CF) étaient évalués.
Résultats : À tout moment (T0, T3, T6), aucune différence statistiquement significative n’a été observée quant à la position antéro-postérieure du CF (p=0,854), la répartition ou la simultanéité des contacts, quelle que soit la modalité de traitement. Le CF était situé antérieurement chez les patients de sexe féminin à tout temps (p=0,002). La mise en place fonctionnelle semblait être terminée dès trois mois pour les deux groupes.
Conclusion:
La qualité de l’occlusion était comparable dans les deux groupes six mois après la dépose des appareils orthodontiques, signifiant l’absence d’influence du type de traitement à court terme. Le sexe féminin pourrait être associé à un CF plus antérieur même après six mois de mise en place fonctionnelle.Objective: Following aligner therapy, a lack of posterior contacts is common and is expected to resolve with settling. The aim of the study was to compare the quality of occlusion and settling, immediately after treatment and during a retention period of six months, in patients treated with fixed appliance therapy or clear aligners. Materials and Methods: 25 patients treated with fixed appliances and 14 patients treated with aligners were evaluated by a digital occlusal analysis (T-Scan 9) at time of debonding (T0) and 3 and 6 months later (T3 and T6). Subjects (41% female, average age 19.38 ± 5.98) were treated without extraction or maxillofacial surgery using either bonded wires or removable appliances without occlusal coverage as retainers. Contact symmetry, simultaneity and the antero-posterior position of the Center of Force (COF) were assessed at the time of debonding, and after 3 and 6 months of retention. Results: At all times of evaluation, the COF position was not statistically different for both treatment modalities (p=0.854), but was located more anteriorly in female patients when compared to male patients (p= 0.002). Settling appeared to be completed by 3 months in both groups. Conclusion: The quality of the occlusion was comparable after 6 months of settling when treated with either treatment modality indicating no short-term effect of treatment type. Females maintained a more anterior COF after six months of retention.