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1
Du, Raan Frederick Johannes. "Influence of orthodontic caregiver behaviour on the perceived satisfaction of patients during orthodontic treatment." Thesis, University of the Western Cape, 2014. http://hdl.handle.net/11394/4247.
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Magister Scientiae Dentium - MSc(Dent)Influence of orthodontic caregiver behaviour on the perceived satisfaction of patients during orthodontic treatment. Dr. F.J. du Raan M.Sc. (Orthodontics) thesis, Department of Orthodontics, University of the Western Cape. In this thesis I interviewed patients that are busy with orthodontic treatment, as well as those that have undergone orthodontic treatment at the department of Orthodontics at the University of the Western Cape, with the aid of four questionnaires. Patients completed questionnaires to provide general and demographic information, quantify their satisfaction with the orthodontic treatment process, their perception of the orthodontic clinician's behavioural traits and lastly they completed the NEO-FFI personality questionnaire to determine their own personality profile. All these questionnaires were used in previous studies, or they were slightly modified to be applicable to orthodontics. The information gained was used to determine if there are correlations between the patient’s perceived satisfaction of the treatment process with patient specific treatment variables (as acquired from the General information and Demographics Questionnaire ), demographic factors, clinician's behavioural traits and patient specific personality traits and any combination of the above mentioned. We wanted to determine which behavioural traits of the orthodontic caregiver influences the perceived satisfaction with the treatment to the greatest extent. Furthermore, we wanted to determine if certain personality traits of the patients would influence their perceived satisfaction with the treatment process or their perception of the clinician's behavioural traits. The only aspect from the General Information and Demographics Questionnaire that had any correlation to satisfaction with the treatment process or the perception of the clinician's behavioural traits, was whether the patient was treated by a single registrar or multiple registrars. Patients treated by multiple clinicians had a lower average score for satisfaction and orthodontist behaviour. Results from the study shows that all the clinician's behavioural traits do have statistically significant influence on the perceived satisfaction with the treatment process, but certain behavioural traits have a greater influence. Result showed Empathy and Care to have the strongest influence on perceived satisfaction, whereas Motivation has the lowest influence. The NEO-FFI personality questionnaire was used to register each patient's personality profile. Scoring for the following personality traits created the personality profile: Neuroticism, Extraversion, and Openness to Experience, Conscientiousness and Agreeableness. Patient personality profiles were shown to have no significant influence on the patient's perceived satisfaction with the treatment process.Neuroticism was shown to have a weak negative correlation with the Professionalism sub-category of the Orthodontic Clinician Behaviour Questionnaire. Conscientiousness has been shown to have a weak positive correlation with all categories of the Orthodontic Clinician Behaviour Questionnaire It is put forth by the researcher that more time and effort has to be put into improving all aspects of the clinician's behaviour, as it will positively influence the perceived satisfaction of the orthodontic treatment process.Even though there are no significant correlations, patients needs to be screened to determine their personality profiles, as this may lead to slight improved scoring on certain behavioural aspects which may in turn lead to greater patient satisfaction. It may be especially worthwhile to recognise the neurotic patient and treat them on a more personal level, as this may improve their overall satisfaction.
2
Vaughan, Peter Powell. "Evaluation Of Orthodontic Positioners." Thesis, Faculty of Dentistry, 1986. https://hdl.handle.net/2123/4614.2.
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Tooth positioners are held in high regard by many prominent orthodontists. The literature has many references to the excellent results produced by tooth positioners. For the Begg 'lightwire technique, tooth positioners are considered the best form of retention (Begg 8 Kesling, 1977). However, there has been no clinical evaluation of the tooth positioner in comparison to conventional retainers.
The aim of this thesis is to present a method of evaluating post orthodontic treatment occlusal changes in patients who wore either a tooth positioner or a conventional retainer. The conventional retainer used in this study is of the form recommended by Begg and has come to be known in Australia as the “Begg retainer". l have therefore used the term “Begg retainer" in this thesis. Post orthodontic treatment changes were evaluated by assessing the number of inter-occlusal contacts when the jaws where clenched together in maximum intercuspation. I considered that if the Begg retainer and tooth positioner had differing effects, then it would be reflected in assessing the change in the number of occlusal contacts.
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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.
4
Vargas, Deborah Bayer Ferraz. "Estudo comparativo da retenção das bandas ortodônticas Grip Tite, convencional e convencional com a superfície interna microjateada por óxido de alumínio /." Araraquara : [s.n.], 2007. http://hdl.handle.net/11449/95778.
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Orientador: Lídia Parsekian MartinsBanca: Dirceu Barnabé Raveli
Banca: Ana Cláudia de Mello
Resumo: O objetivo do presente trabalho foi avaliar in vitro, por meio de um ensaio mecânico, a força necessária para a remoção das bandas ortodônticas Grip Tite (C), Convencional (A) e banda Convencional com a superfície interna microjateada por óxido de alumínio (B). Também analisar visualmente a quantidade de cimento residual, e classificar usando uma escala de incrementos a 25%. Após, verificar, por meio de MEV, a superfície com melhores características para a retenção. Os resultados obtidos mostraram que a média de carga do Grupo B, bandas microjateadas internamente por óxido de alumínio, foi significantemente maior que as médias dos Grupos A, bandas Convencionais, e C, bandas Grip Tite. Quanto a quantidade de cimento remanescente nas bandas, o Grupo B apresentou 100% das bandas com índice 4, indicando a presença de mais de 75% de cimento residual nas bandas, enquanto que nos Grupos A e C, houve a predominância do índice 1, indicativo de menos de 25% de cimento residual nas bandas, sem diferença significativa entre esses dois grupos. Os resultados foram confirmados pela MEV, onde observou-se uma superfície com melhores características para a retenção do cimento nas bandas onde foi realizado o processo de microjateamento. Conclui-se que o processo de microjateamento por óxido de alumínio, na superfície interna das bandas convencionais, aumenta a força necessária para a remoção das bandas e aumenta a quantidade de cimento residual preso à superfície da banda. Quando analisada pela MEV, essa superfície apresenta-se como a mais áspera e rugosa, com a maior quantidade de cimento de ionômero de vidro aderido à banda.
Abstract: The purpose of this study was to evaluate in vitro, the necessary force for the removal of Grip Tite, Conventional and Sandblasted orthodontics molar bands, as well as, to analyze and to classify the amount of residual cement in the internal surface of these bands. After that, checking through scanning electron microscopy, the surface with better characteristics for the retention. The obtained results showed that the load average of the group B, Sandblasted bands, was significantly higher than the group A, Conventional bands, and C, Grip Tite bands. Observing the amount of remaining cement in the bands, group B presented 100% of the bands with index 4, indicating the presence of more than 75% of residual cement in the bands, while in the groups A and C, had the predominance of index 1, indicative of less than 25% of residual cement in the bands, without significant difference between these two groups. The results were confirmed by the scanning electronic microscopy, where the surface with better characteristics for the retention of the cement was observed, in the bands where the sandblasted process was carried through. It was concluded that the process of sandblasted, in the internal surface of the conventional bands, increases the necessary force for the removal of the bands and increases the amount of residual cement in the internal surface of the band. When analyzed by the scanning electronic microscopy, this surface appeared rougher and corrugated, with great amount of glass ionomer cement adhered to the band.
Mestre
5
Armstrong, David. "The development of an adjustable orthodontic bracket." Thesis, The University of Sydney, 2007. http://hdl.handle.net/2123/4755.
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Tse, Lap Kee Edmond. "A comparative study of the skeletal and dental effects of a modified herbst and the traditional herbst appliances in Southern Chinese a prospective cephalometric study /." Click to view the E-thesis via HKUTO, 1994. http://sunzi.lib.hku.hk/HKUTO/record/B38628454.
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Almandaey, Abdulhakim Ahmad Q. A. "Surgical exposure, bonding and orthodontic traction of impacted maxillary anterior teeth a retrospective study /." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39766135.
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Almandaey, Abdulhakim Ahmad Q. A. "Surgical exposure, bonding and orthodontic traction of impacted maxillary anterior teeth: a retrospectivestudy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39766135.
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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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Reddick, Chad R. "A comparative study of nonextraction treatment efficiency using conventional edgewise brackets and self-ligating brackets." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2009r/reddick.pdf.
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Lawton, Brett Thomas. "Orthodontic psychosocial impacts." [Gainesville, Fla.] : University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000728.
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Fergus, Kelly-Gwynne Mason. "Esthetic evaluation of edgewise orthodontic treatment in matched class II, division 1 subjects, with and without a MARA." View the abstract Download the full-text PDF version, 2008. http://etd.utmem.edu/ABSTRACTS/2008-022-Fergus-index.html.
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Thesis (M.S. )--University of Tennessee Health Science Center, 2008.Title from title page screen (viewed on July 30, 2008). Research advisor: Edward F. Harris, Ph.D. Document formatted into pages (xi, 174 p. : ill.). Vita. Abstract. Includes bibliographical references (p. 103-112).
13
謝立祺 and Lap Kee Edmond Tse. "A comparative study of the skeletal and dental effects of a modified herbst and the traditional herbst appliances in Southern Chinese: a prospective cephalometric study." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1994. http://hub.hku.hk/bib/B38628454.
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Vargas, Deborah Bayer Ferraz [UNESP]. "Estudo comparativo da retenção das bandas ortodônticas Grip Tite, convencional e convencional com a superfície interna microjateada por óxido de alumínio." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/95778.
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vargas_dbf_me_arafo.pdf: 680704 bytes, checksum: b86da5b28576f3b91eb2292fc618c8b8 (MD5)Universidade Estadual Paulista (UNESP)
O objetivo do presente trabalho foi avaliar in vitro, por meio de um ensaio mecânico, a força necessária para a remoção das bandas ortodônticas Grip Tite (C), Convencional (A) e banda Convencional com a superfície interna microjateada por óxido de alumínio (B). Também analisar visualmente a quantidade de cimento residual, e classificar usando uma escala de incrementos a 25%. Após, verificar, por meio de MEV, a superfície com melhores características para a retenção. Os resultados obtidos mostraram que a média de carga do Grupo B, bandas microjateadas internamente por óxido de alumínio, foi significantemente maior que as médias dos Grupos A, bandas Convencionais, e C, bandas Grip Tite. Quanto a quantidade de cimento remanescente nas bandas, o Grupo B apresentou 100% das bandas com índice 4, indicando a presença de mais de 75% de cimento residual nas bandas, enquanto que nos Grupos A e C, houve a predominância do índice 1, indicativo de menos de 25% de cimento residual nas bandas, sem diferença significativa entre esses dois grupos. Os resultados foram confirmados pela MEV, onde observou-se uma superfície com melhores características para a retenção do cimento nas bandas onde foi realizado o processo de microjateamento. Conclui-se que o processo de microjateamento por óxido de alumínio, na superfície interna das bandas convencionais, aumenta a força necessária para a remoção das bandas e aumenta a quantidade de cimento residual preso à superfície da banda. Quando analisada pela MEV, essa superfície apresenta-se como a mais áspera e rugosa, com a maior quantidade de cimento de ionômero de vidro aderido à banda.
The purpose of this study was to evaluate in vitro, the necessary force for the removal of Grip Tite, Conventional and Sandblasted orthodontics molar bands, as well as, to analyze and to classify the amount of residual cement in the internal surface of these bands. After that, checking through scanning electron microscopy, the surface with better characteristics for the retention. The obtained results showed that the load average of the group B, Sandblasted bands, was significantly higher than the group A, Conventional bands, and C, Grip Tite bands. Observing the amount of remaining cement in the bands, group B presented 100% of the bands with index 4, indicating the presence of more than 75% of residual cement in the bands, while in the groups A and C, had the predominance of index 1, indicative of less than 25% of residual cement in the bands, without significant difference between these two groups. The results were confirmed by the scanning electronic microscopy, where the surface with better characteristics for the retention of the cement was observed, in the bands where the sandblasted process was carried through. It was concluded that the process of sandblasted, in the internal surface of the conventional bands, increases the necessary force for the removal of the bands and increases the amount of residual cement in the internal surface of the band. When analyzed by the scanning electronic microscopy, this surface appeared rougher and corrugated, with great amount of glass ionomer cement adhered to the band.
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Cox, Stan C. "A comparative study of extraction treatment efficiency using conventional edgewise brackets and self-ligating brackets." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2008m/cox.pdf.
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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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Aljabaa, Aljazi Hussain. "Adherence among orthodontic patients." Thesis, King's College London (University of London), 2016. https://kclpure.kcl.ac.uk/portal/en/theses/adherence-among-orthodontic-patients(3184705a-7a98-4381-a0fa-9f5d61734f54).html.
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Objectives: A patient’s adherence is an important factor for successful orthodontic treatment. This adherence can take the form of maintaining good oral hygiene, appliance maintenance, observing dietary recommendations, and appointment keeping. This thesis consisted of three studies. A systematic review was conducted to investigate the effectiveness of interventions to enhance adherence among orthodontic patients aged 12 to 18. Specific adherence outcomes included: recall of information given by the orthodontic team; attendance at orthodontic appointments; self-reported oral hygiene behaviour; and clinical indices of oral hygiene. A survey was undertaken to explore predictors of adherence amongst patients 12–18 years of age receiving orthodontic treatment with fixed appliances at the initial follow-up appointment 6 weeks post bracket placement. Finally, a randomised controlled trial compared three methods designed to enhance adherence to oral hygiene instructions in orthodontic patients aged 12–18 years: mind map, if-then plan, and leaflet. Materials and Methods: Systematic review: Electronic searches of Medline via OVID (1966– March 2012), EMBASE, and the Cochrane central register of control trials from its inception to March 2012, as well as a hand search were undertaken to identify relevant studies. The longitudinal study: Measured adherence to orthodontic treatment in terms of self-reported oral hygiene-related behaviour, oral hygiene maintenance, knowledge of oral health-related behaviour, appliance breakages, and appointment attendance among 200 individuals undergoing maxillary and mandibular fixed orthodontic appliances with an age range of 12 to 18 years. Oral health-related behaviour and clinical indicators of oral healthwere assessed at bond-up appointment (T1) and at 6 weeks follow up appointment (T2) to determine their relationship to adherence. Randomised controlled trial: Orthodontic patients from Guy’s and St Thomas’ NHS Trust were drawn as potential participants; patients were randomly allocated to one of the three interventions used. Eligibility criteria: patients aged 12–18 years undergoing maxillary and mandibular fixed orthodontic treatment. Individuals with systemic disease, craniofacial development disorders including cleft lip and palate, individuals with previous history of orthodontic treatment, patients attending the specialist hypodontia clinic and individuals who declined to participate were excluded. Outcomes: Primary outcomes: plaque levels. Secondary outcomes: bleeding on probing, patient’s knowledge about adherence in orthodontic treatment, and self-reported behaviours. Randomisation: patients were randomly allocated to one of three conditions. The three groups were: mind mapping, if-then planning group, and patient information tools (leaflet). Allocation was concealed using sealed envelopes. Blinding: the participant and their parents as well as the researcher undertaking the intervention and assessing the outcomes were not blinded. The statistician undertaking the statistical analysis was blinded. Participants were assessed at four time points: at the fitting of the fixed appliance (T1); at initial follow-up 6 weeks later, at which time after the assessment of their oral hygiene and completion of the questionnaire (T2), they were randomly allocated to the three groups of intervention; 6 weeks after the intervention (T3); and 18 weeks after the intervention (T4).Results: Systematic Review: A total of 381 articles were identified through the electronic searches. Initial screening of the abstracts and titles by all review authors identified 7 articles that met the inclusion criteria for this review. The full articles were then retrieved. Four randomised controlled trials were found; all used different methods of intervention, including: a system of rewards or awards; the Hawthorne effect; written information; and demonstration of the microbiology of plaque. The longitudinal study: Significant changes in lingual plaque (P= 0.026), bleeding on probing (P= 0.006), and knowledge (P < 0.001) were found between bond-up and at initial follow-up. There were no relationships between age and gender of the patients and adherence. Clinical status at bond-up was the only significant predictor of clinical status at initial follow-up. Randomised Controlled Trial: Total sample of 90 participants were randomised in a 1:1:1 ratio. No statistical differences were found in adherence among the three methods used. Conclusion: The literature advocates the use of several methods to improve compliance/adherence among orthodontic patients. While there is insufficient evidence to allow clinicians to choose a single method, the results demonstrate the value of spending time with patients to illustrate the importance of adherence. Future studies should develop multiple methods of assessing patient adherence including self-report, behavioural observation and recording, as well as change in clinical indices, with different types of interventions to be included and tested for effectiveness. The survey demonstrated that the oral hygiene of patients worsens following the start of orthodontic treatment. Age, gender, and knowledge are not good predictors of adherence. However, initial clinical status predicts subsequent adherence. The randomised controlled trial revealed no differences in adherence among the three methods used.
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Wong, Pamela. "A comprehensive survey of retention procedures /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17941.pdf.
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Miller, Kevin Blaine. "A comparison of treatment impacts between invisalign and fixed appliance therapy during the first seven days of treatment." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010291.
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Thesis (Ph.D.)--University of Florida, 2005.Typescript. Title from title page of source document. Document formatted into pages; contains 36 pages. Includes Vita. Includes bibliographical references.
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Mahmoud, Ghiath. "Effect of fluoride-containing orthodontic adhesives on enamel demineralisation adjacent to orthodontic brackets." Thesis, University of Newcastle Upon Tyne, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.489333.
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Karl, Paul James. "The comparison of centric relation records obtained with and without the use of an anterior deprogrammer appliance." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21090.pdf.
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Bales, Jeffrey M. "Deformation of reinforced polycarbonate orthodontic brackets stressed by a labiolingual moment." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/MQ32050.pdf.
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Michelberger, David James. "An investigation of the friction, wear and corrosion properties of orthodontic appliances." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ40088.pdf.
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Roberts, Scott Cameron. "Automated manufacturing of orthodontic appliances." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30057.
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This thesis presents a computer controlled system that partially automates the production
of upper-mouth orthodontic appliances. The machine performs the deposition and curing required to manufacture the acrylic portion of the appliance. Under this new process, the operator places the orthodontic wires and expansion screws on the surface of the dental cast, secures the cast onto the machine and describes the desired shape of the appliance through a graphical user interface. The machine then applies and cures the acrylic to form the finished appliance. Only minimal grinding and buffing is required.
The system consists of a robotic device that includes a two-axis platform for manipulating
dental casts; and a two-axis gantry for positioning an acrylic pump, ultraviolet lamp, laser and rotating mirror system, and a camera. The laser and camera are part of a range vision system for mapping the surface of the dental cast to obtain elevation and surface normal data. The pump and lamp are used to deposit and cure light activated liquid acrylic. The rotary table system provides orientation for the dental cast to permit surface mapping and acrylic deposition and curing. The table is able to orient the dental cast to avoid movement of the liquid acrylic on the surface of the cast before curing takes place. The machine software provides tool-workpiece collision avoidance, process planning, and machine function and motion control.
Several tests, including the complete production of orthodontic appliances, have been performed with the system. The average time for surface mapping of a dental cast is 11.5 minutes and the average time for acrylic deposition and curing is 54.3 minutes.Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate
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Awawdeh, Mohammed Adel. "An investigation of orthodontic friction." Thesis, Queen's University Belfast, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431404.
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Gladwell, Jason Thomas. "Concurrent Whitening and Orthodontic Treatment." VCU Scholars Compass, 2007. http://scholarscompass.vcu.edu/etd/1469.
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The aim was to evaluate whether a whitening system, when used during the final stages of orthodontics, would yield results comparable to whitening alone. Patients were assigned to either the control (n=20) or experimental (n=26) groups. At T1, patients were given a ten day supply of Trèswhite⢠by Opalescence®, instructions on use, and initial shade determination was made and photographs were taken. At T2 and T3, shade determination was accomplished and updated photographs were taken. Whitening of the teeth occurred in both groups on average, but significantly more whitening was experienced in the experimental group (p < 0.004). An average of 87% of teeth whitened during orthodontic treatment compared to 97% of control teeth (p < 0.01) were judged to be uniform in appearance. In conclusion, the data do not contraindicate the concurrent accomplishment of teeth whitening during orthodontic treatment.
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Lam, Garret Chi Yan. "Biomechanics of orthodontic tooth movement /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MECH%202003%20LAM.
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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.Includes bibliographical references (leaves 118-122). Also available in electronic version. Access restricted to campus users.
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Mcnaught, Andrew James. "Factors Influencing Orthodontic Workforce Requirements." Thesis, Faculty of Dentistry, 1996. http://hdl.handle.net/2123/5019.
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Noordien, Naeemah. "Accuracy of Orthodontic bracket adaptation." University of the Western Cape, 2019. http://hdl.handle.net/11394/7045.
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Magister Scientiae Dentium - MSc(Dent)Background: A close marginal adaptation between the tooth and the bracket base is important since it provides the space for the adhesive. In order to withstand and resist the orthodontic forces exerted as well as everyday forces like mastication and oral hygiene practices, the adhesive material to the bracket must have sufficient sheer bond strength. This means that no deformations, cracks, or fractures should occur within the bracket material and adhesive (Keizer et al., 1976). Aim: The aim of this study was to determine the accuracy of the marginal adaptation of the bracket bases of seven different brands of orthodontic brackets to the tooth surface of a right upper first premolar (ie. Abzil, Forestadent, GAC, Gemini, IMD, Ormco and Victory LP). Method: This research was an in vitro, descriptive comparison study. Fifteen caries and crack free intact human first premolars were used. The teeth were obtained from patients requiring extractions for orthodontic purposes and collected from Tygerberg Oral Health Centre. A convenience sample method was used, where whenever an upper caries free premolar was extracted, the parent was asked if the tooth could be used for this study and consent was obtained. The crowns of the 15 teeth were cleaned and polished with pumice and rubber cups for 10 seconds (as the clinician would do prior to bracket cementation). The same 15 teeth were used with the seven different brands of brackets in order to establish a comparison of the adaptability of the brackets. The brackets were placed at a set orthodontic prescription of 4mm (measured from the slot area of the bracket to the tip of the buccal cusp of the tooth) on the upper first premolars. After bracket placement, the dontrix gauge was applied to the bracket to engage the slot area. The brackets were held in place with a constant force of 0.70 Newton (N) by the dontrix gauge. This allowed for reproducibility for the seven brackets with all fifteen teeth. In order to assess the space between the brackets and the teeth no adhesive was used. The space between the margins of the bracket and tooth interface was viewed under the Stereomicroscope (Carl Zeiss microscope, Zeiss Stemi508) at 50 times magnification. A two way mixed measures ANOVA was run to determine whether there were differences between the seven brackets placed at six points on the tooth surface. Results: GAC had the smallest overall mean measurement between bracket base and tooth surface followed by Ormco and Gemini respectively. Abzil had the largest overall mean measurement for the six points around the bracket
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Junior, Jose Hermenergildo dos Santos. "Avaliação do esmalte dentário antes e após a colagem e descolagem de braquetes ortodônticos." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/23/23151/tde-08042009-114516/.
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O objetivo deste trabalho foi avaliar a quantidade de resina residual após a descolagem de braquetes e a perda e/ou desgaste de esmalte ocorrido durante as fases de: colagem, descolagem e remoção dos remanescentes resinosos, na área do braquete e adjacente. A amostra foi constituída de 150 pré-molares, dividida em dois grupos de acordo com o tipo de material do braquete utilizado: metálico (n=75) e cerâmico (n=75), nas duas primeiras fases do estudo, colagem e descolagem. Os procedimentos de colagem foram realizados de acordo com a International Organization for Standardization (2003), e a descolagem segundo a orientação preconizada pelo fabricante. Na fase de remoção dos remanescentes resinosos foram considerados cinco grupos de acordo com o protocolo de acabamento/polimento e prescrição dos respectivos fabricantes: FF diamantada + Soflex; Pedra Shofu; Dentaurum Carbide; Komet Carbide e Jet Carbide, com auxilio de lupas telescópicas sob a magnificação 3x. A avaliação qualitativa (ARIm e ESI) foi realizada por meio de fotografias digitais (lupa estereoscópica - Olympus SZ61). A avalição quantitativa foi realizada pelo método de medição por Coordenada - Coordinate Measuring Machines (Mitutoyo), mod. Legex CNC 9106 - Perfil de linha. As possíveis diferenças entre os protocolos de acabamento/polimento foram avaliadas pela análise de variância (ANOVA) e pelo teste de comparações múltiplas de Tukey. As quantidades médias de resina residual encontrada na área sob a base do braquete, após acabamento/polimento foram: Diamantada FF + Soflex (10,4 m ±10,5), Pedra Shofu (18,5 m ± 12,1), Dentaurum Carbide (11,2 m ± 11,9), Komet Carbide (9,5 m ± 10,8) e Jet Carbide (22,8 m ± 24,0). E na área adjacente: Diamantada FF + Soflex (14,9 m ± 13,0), Pedra Shofu (22,8 m ±19,5), Dentaurum Carbide (21,4 m ±18,5), Komet Carbide (9,6 m ± 7,7), Jet Carbide (27,8 m ± 24,5). Desta forma, constatou-se que, em geral, os protocolos de acabamento/polimento deixaram maior quantidade de resina residual sobre a área adjacente que na área do braquete, com exceção do protocolo Komet Carbide, que teve desempenho semelhante em ambas as áreas. E as quantidades médias de perda e/ou desgaste do esmalte na área do braquete foram: Diamantada FF + Soflex (-134,9 m ± 56,4), Pedra Shofu ( 39,2 m ± 12,8), Dentaurum Carbide ( 70,5 m ± 27,9), Komet Carbide (-44,8 m ± 14,3) e Jet Carbide ( 68,2 m ± 35,7) na área do braquete, enquanto na área adjacente: Diamantada FF + Soflex (-124,7 m ± 133,1), Pedra Shofu (- 37,9 m ± 25,1), Dentaurum Carbide (- 60,1 m ±32,4), Komet Carbide (-36,6 m ± 19,5) e (Jet Carbide 65,4 m ± 65,0) (Tabela 5.9). Ressalta-se que em ambas as áreas de avaliação, o protocolo (Diamantada FF + Soflex) foi responsável pela maior quantidade de perda e/ou desgaste, diferenciando-se com significância estatística dos demais protocolos. Com base nestes resultados podemos concluir que os protocolos de acabamento/polimento avaliados demonstraram excelente desempenho na remoção dos remanescentes resinosos embora nenhum deles tenha sido capaz de remover totalmente o material de colagem, todos danificaram o esmalte, sendo o protocolo Komet carbide o mais diferenciado.The objective of this study was to evaluate the quantity of residual resin after removal of brackets and the loss and//or wear-and-tear of enamel occurring during the phases of fixing, detaching and removal of remnant resin in the bracket area and its adjacent. The sample was made up of 150 premolars, divided into two groups in accordance with the type of bracket material used: metal (n=75) and ceramic (n=75), in the two initial phases of study, fixing and removal. Fixing procedures were carried out in accordance with the International Organization for Standardization, (2003), and removal according to orientation advocated by the manufacturer. In the removal of remnant resin phase five groups were considered, all in agreement with the finishing/polishing protocol and prescription of the respective manufacturers: FF diamantada + Soflex; Pedra Shofu; Dentaurum Carbide; Komet Carbide and Jet Carbide, and with the aid of telescopic magnifying glass of three-fold magnification Qualitative evaluation (ARIm and ESI) was done by means of digital photographs(stereoscopic magnifying glass Olympus SZ61). Quantitative evaluation was conducted using the coordinate medication method - Coordinate Measuring Machines (Mitutoyo), mod. Legex CNC 9106 - line profile. Possible differences between finishing/polishing protocols were evaluated via variance analysis (ANOVA), and by Tukey Multiple Comparison test. Median quantities of residual resin found in the region below the base of the bracket, following finishing/polishing were: Diamantada FF + Soflex (10,4 m ±10,5), Pedra Shofu (18,5m ± 12,1), Dentaurum Carbide (11,2 m ± 11,9), Komet Carbide (9,5 m ± 10,8) and Jet Carbide (22,8 m ± 24,0). In this way, it was confirmed that finishing/polishing protocols, in general, left the major part of residual resin below the adjacent area than in the bracket area, with the exception of Komet Carbide protocol, displaying similar performance in both areas Median quantities of loss and/or wearand- tear of enamel in the bracket area were: Diamantada FF + Soflex (-134,9 m ± 56,4), Pedra Shofu ( 39,2 m ± 12,8), Dentaurum Carbide ( 70,5 m ± 27,9), Komet Carbide (-44,8 m ± 14,3) and Jet Carbide ( 68,2 m ± 35,7) in bracket area, while in adjacent area: Diamantada FF + Soflex (-124,7 m ± 133,1), Pedra Shofu (- 37,9 m ± 25,1), Dentaurum Carbide (- 60,1 m ±32,4), Komet Carbide (-36,6 m ± 19,5) and (Jet Carbide 65,4 m ± 65,0) (Table 5.9) Standing out in both areas of evaluation, protocol (Diamantada FF + Soflex) was responsible for the major quantity of loss and /or wear and tear, differentiating itself from the other protocols by significant statistics. Based on these results, we can conclude that the finishing/polishing protocols evaluated, displayed excellent performance in the removal of remnant resin, although none have totally been capable of removing fixing material, and all damaged the enamel, with Komet protocol being the most differentiated.
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Ribeiro, Alexandre Antonio [UNESP]. "Avaliação mecânica tridimensional de molas T compostas de NiTi e Aço." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/145504.
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000874741.pdf: 2115276 bytes, checksum: 22aa654fa4b88145cca778bd61f794f9 (MD5)O fechamento de espaços por meio de molas T com a liga de Níquel-Titânio (NiTi) para a retração em massa ainda não foi estudada. A superelasticidade e memória de forma são propriedades desta liga interessantes para a movimentação dentária. Sendo assim, o objetivo foi determinar, por meio da avaliação tridimensional as melhores variações do design de molas T compostas para o fechamento de espaços em massa. Foram utilizadas cem molas compostas por alças T de NiTi e fios base de aço inoxidável, unidos por tubos cruzados. As molas foram divididas em grupos de 10 molas de acordo com o calibre do fio de NiTi, altura da mola, ativação horizontal ou ainda variações no raio de pré-ativação ou espessura do fio base. As molas foram testadas na máquina de ensaios OFT (Orthodontic Force Tester). Foram medidos força, momento e relação momento força (M:F) nos eixos de interesse. A análise multivariada de perfis foi aplicada para comparação dos grupos. Observou-se que as molas com médias de força horizontal adequadas para retração tem espessuras de 0,017 x 0,025 e 0,018 x 0,025 de NiTi. As variáveis altura da mola e ativação horizontal demonstraram interação durante a desativação para a variável força, entretanto, não demonstraram esta relação para momento e M:F. Observou-se que o melhor design das molas foi a altura de 7mm, ativação horizontal de 7mm e raio de pré-ativação de 6mm. Concluiu se que as molas compostas de NiTi compostas apresentaram propriedades adequadas para retração em massa, especialmente com pré-ativação 6mm de raio de curvatura.
The space closure with Nickel-Titanium alloy (NiTi) T-loop springs for en masse retraction has not been studied. Superelasticity and shape memory are NiTi properties interesting to tooth movement. The aim was to determine by assessing three dimensionally the best T-loop spring design to the en masse space. Were tested one hundred T-loop composed springs by handles of rectangular NiTi wires and stainless steel horizontal rods, joined by criss-cross tubes. The T-loop composed springs were divided in groups of ten springs according to the caliber of the NiTi wire, handles height, horizontal activation or variations of preactivation radius or thickness of the wire rods. The springs were tested in the OFT device (Orthodontic Force Tester) for measuring orthodontic force system. Mmultivariate analysis profiles was used to compare the groups along the deactivation and possible interaction between the variables under study. It was observed that composed T-loop springs showed adequate horizontal force average for en mass retraction 0.017 x 0.025 and 0.018 x 0.025 NiTi wires. The height handles and horizontal activation variables demonstrated interaction during off to the force variable, however, have not shown this relationship to moment and M:F. It was considered that the best design of T-loop was 7mm height, 7mm horizontal activation and pre-activation radius 6mm. It was concluded that composite NiTi T-loop springs showed adequate properties for en masse retraction...(Complete abstract electronic access below)
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Ribeiro, Alexandre Antonio. "Avaliação mecânica tridimensional de molas T compostas de NiTi e Aço /." Araraquara, 2015. http://hdl.handle.net/11449/145504.
Full textAbstract:
Orientador: Lidia Parsekian MartinsCo-orientador: Renato Parsekian Martins
Banca: Laurindo Zanco Furquim
Banca: José Nelson Mucha
Banca: Luis Geraldo Vaz
Banca: Ary dos Santos Pinto
Resumo: O fechamento de espaços por meio de molas T com a liga de Níquel-Titânio (NiTi) para a retração em massa ainda não foi estudada. A superelasticidade e memória de forma são propriedades desta liga interessantes para a movimentação dentária. Sendo assim, o objetivo foi determinar, por meio da avaliação tridimensional as melhores variações do design de molas T compostas para o fechamento de espaços em massa. Foram utilizadas cem molas compostas por alças T de NiTi e fios base de aço inoxidável, unidos por tubos cruzados. As molas foram divididas em grupos de 10 molas de acordo com o calibre do fio de NiTi, altura da mola, ativação horizontal ou ainda variações no raio de pré-ativação ou espessura do fio base. As molas foram testadas na máquina de ensaios OFT (Orthodontic Force Tester). Foram medidos força, momento e relação momento força (M:F) nos eixos de interesse. A análise multivariada de perfis foi aplicada para comparação dos grupos. Observou-se que as molas com médias de força horizontal adequadas para retração tem espessuras de 0,017" x 0,025" e 0,018" x 0,025" de NiTi. As variáveis altura da mola e ativação horizontal demonstraram interação durante a desativação para a variável força, entretanto, não demonstraram esta relação para momento e M:F. Observou-se que o melhor design das molas foi a altura de 7mm, ativação horizontal de 7mm e raio de pré-ativação de 6mm. Concluiu se que as molas compostas de NiTi compostas apresentaram propriedades adequadas para retração em massa, especialmente com pré-ativação 6mm de raio de curvatura.
Abstract: The space closure with Nickel-Titanium alloy (NiTi) T-loop springs for en masse retraction has not been studied. Superelasticity and shape memory are NiTi properties interesting to tooth movement. The aim was to determine by assessing three dimensionally the best T-loop spring design to the en masse space. Were tested one hundred T-loop composed springs by handles of rectangular NiTi wires and stainless steel horizontal rods, joined by criss-cross tubes. The T-loop composed springs were divided in groups of ten springs according to the caliber of the NiTi wire, handles height, horizontal activation or variations of preactivation radius or thickness of the wire rods. The springs were tested in the OFT device (Orthodontic Force Tester) for measuring orthodontic force system. Mmultivariate analysis profiles was used to compare the groups along the deactivation and possible interaction between the variables under study. It was observed that composed T-loop springs showed adequate horizontal force average for en mass retraction 0.017 "x 0.025" and 0.018 "x 0.025" NiTi wires. The height handles and horizontal activation variables demonstrated interaction during off to the force variable, however, have not shown this relationship to moment and M:F. It was considered that the best design of T-loop was 7mm height, 7mm horizontal activation and pre-activation radius 6mm. It was concluded that composite NiTi T-loop springs showed adequate properties for en masse retraction...(Complete abstract electronic access below)
Doutor
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Phillips, Joseph, and James Chen. "PATIENT AND PARENT PERCEPTIONS ON OUTCOMES IN EARLY ORTHODONTIC TREATMENT." Scholarly Commons, 2020. https://scholarlycommons.pacific.edu/dugoni_etd/3.
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Introduction: Orthodontics has clinical benefits, however, the psychosocial outcomes are not well understood. These soft benefits are often classified as aesthetic, functional, and psychosocial, however, there is limited work understanding these outcomes as reported directly from the patient. By better understanding the patient’s perspectives, we can continually refine our clinical model to be patient-centric and more appropriately manage the patient’s expectations and experiences. Materials and Methods: This is a cross-sectional qualitative study of 20 parents of 24 children ages 8-11 years. Participants were remotely interviewed using a semi-structured chronologically based line of questioning to elucidate their perceived outcomes of early orthodontic treatment or phase one. A content thematic analysis using a framework approach was used to analyze the resulting data. Results: The thematic analysis uncovered four major themes and associated subthemes as follows (1) dental health including functional changes, aesthetic improvement, and improved cleansability; (2) opportunity cost: meaning harnessing growth for lasting change, avoidance of future orthodontic treatment, avoidance of future dental treatment, and supervision of growth; (3) social outcomes: encompassing external perception and acceptance, self-perception, parental perception, and reduced dental anxiety; and (4) behavioral changes: including the correction of bad habits, development of good oral hygiene, and an increase in responsibility of the patient. Conclusions:This study highlights the depth of psychosocial benefit perceived by patients undergoing early orthodontic treatment, with the main outcome being functional improvement, followed by an advantage to treatment at a young age, and an improvement in aesthetics. Patients did not recognize an increase in self-perception which is contrary to outcomes previously found in other age groups.
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Moylan, Heather. "Accuracy of a smartphone-based orthodontic treatment monitoring application." VCU Scholars Compass, 2018. https://scholarscompass.vcu.edu/etd/5393.
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Objectives: Dental Monitoring® (“DM,” Dental Monitoring, Paris, France), is a cloud-based software that allows orthodontists to track patients’ treatment remotely. The purpose of this study was to investigate the accuracy of the software in making linear measurements.
Methods: Patients took intraoral photographs using the DM application, immediately followed by impressions for plaster models. Intercanine and intermolar width and arch depth measurements were made by DM and compared to measurements made on the plaster models. Data was analyzed using two one-sided t-tests for equivalence with equivalence bounds of
+/-0.5mm. Significance level was set at 0.05.
Results: Thirty sets of measurements were compared. The intercanine and intermolar measurement differences were on average 0.17mm and -0.02mm, respectively, and were deemed equivalent. The arch depth measurements had an average difference of -0.54mm and were deemed not equivalent.
Conclusion: The monitoring software seems to provide an accurate assessment of linear tooth movements.
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Bouvier, Amy. "Fluoride release, recharge, and re-release from four orthodontic bonding systems." Thesis, NSUWorks, 2012. https://nsuworks.nova.edu/hpd_cdm_stuetd/55.
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A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry.
Objectives: To determine the amount of initial fluoride release from four orthodontic bonding systems over a period of four weeks, and then to subject these materials to an external source of fluoride for recharge in order to measure the amount of fluoride re-release over another four-week interval. Additionally the surface morphology of these materials was analyzed under the scanning electron microscope in order to identify microscopic changes in the materials that may have occurred during the experiment. Methods: Four orthodontic adhesives: Fuji Ortho LC (GC America, Alsip, IL), Transbond XT (3M Unitek, Monrovia, CA), Illuminate Light Cure (Ortho Organizers, Carlsbad, CA), and Opal Seal with Opal Bond MV (Ultradent, South Jordan, UT), n=120 (30/material) were tested for fluoride release at 1 hour, 24 hours, 3 days, 1 week, 2 weeks, 3 weeks and 4 weeks. Samples (10/subgroup/material) were then recharged with an external source of fluoride (toothpaste, foam, or varnish), and retested for fluoride re-release at 1 hour, 24 hours, 3 days, 1 week, 2 weeks, 3 weeks and 4 weeks. The scanning electron microscope was utilized in order to assess each material's surface morphology before testing and after completion of the experiment (n=16). Descriptive statistics, means and standard deviations were calculated for all four materials and their subgroups at each time interval. A mixed model two-way ANOVA was run, using a level of significance of 0.05. Bonferroni multiple comparison tests were conducted using if groups were found to be statistically significantly different. To determine significant differences between fluoride release and re-release for each recharge subgroup within each material group, paired t-tests were performed for the time intervals of 24 hours, 2 weeks, and 4 weeks. For the paired t-tests, the level of significance used was 0.02 to allow for Bonferroni correction. Results: During the initial 24 hours the fluoride measurements (in mg/L or ppm) were as follows: Fuji 9.78±0.65, Illuminate 7.83±1.49, Opal 0.05±0.02, and Transbond 0.01±0.0. At the initial four weeks time point, the readings were as follows: Fuji 6.68±0.79, Illuminate 3.82±1.84, Opal 0.06±0.01, and Transbond 0.01±0.01. The greatest fluoride release came from the varnish subgroups from each of the materials at 2 weeks post re-charge: Fuji 9.16±1.53, Illuminate 7.5±3.1 (tied with foam subgroup 7.5±4.4), Opal 5.3±2.45, and Transbond 3.75±1.67. The greatest fluoride measurement for each material at the final week post-recharge was: Fuji varnish subgroup 8.3±3.58, Illuminate foam subgroup 6.5±3.5, Opal varnish subgroup 2.50±1.1, and Transbond varnish subgroup 1.72±1.82. SEM results showed an observable difference between the materials pre-experiment and post-experiment at a magnification of 50X and 500X. The Fuji foam and paste subgroups displayed surface crackling patterns at both magnifications when compared to the control and varnish samples. The Illuminate control, foam, and paste specimens all had a roughened grainy appearance, while the varnish specimen seemed to be smoothed over by the varnish material. The Transbond samples appeared to have observable differences in surface morphology at 50X, but not at 500X. The Opal paste and foam specimens appeared to have a smoother surface than both the control and the varnish samples. Conclusions: There were significant differences in release and re-release of fluoride among all four adhesives at different time intervals over a period of eight weeks. Significant increase in fluoride re-release was seen for all three of the recharge subgroups for both Opal and Transbond at each time interval. A significant increase in fluoride re-release for the Illuminate group was mainly observed at the end of second and fourth week. Though no significant increase in fluoride re-release was observed, Fuji released highest amount of fluoride during release and re-release, at all different time intervals. Fluoride varnish was the superior recharge material, as it provided the greatest fluoride measurements, followed by foam and toothpaste. There were observable changes in the surface morphology of the materials pre-experiment and post-experiment at a magnification of 50X and 500X, which may have an affect on the fluoride releasing capabilities of the materials.
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Moresca, Ricardo Cesar. ""Estudo dos efeitos dos lacebacks ativos e passivos na biomecânica da fase de nivelamento utilizando-se a técnica MBT"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/23/23133/tde-30082006-151221/.
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O objetivo deste trabalho foi estudar os efeitos dos lacebacks ativos e passivos na biomecânica da fase de nivelamento, utilizando-se a técnica MBT. A amostra foi constituída de 29 sujeitos de pesquisa (22 do gênero feminino e 7 do gênero masculino), brasileiros, leucodermas e pardos, portadores de má oclusão de Classe I e com idade média de 15 anos e 5 meses. O tratamento ortodôntico foi planejado com as extrações dos primeiros pré-molares e, durante a fase estudada, foram empregados apenas fios de aço inoxidável (0.014, 0.016, 0.018, 0.020 e 0.019 x 0.025). Os recursos de ancoragem utilizados para os arcos dentários superior e inferior foram, respectivamente, o aparelho extrabucal tipo IHG e o arco lingual fixo. De acordo com a indicação dos lacebacks, a amostra foi dividida em quatro grupos: grupo I 14 sujeitos que utilizaram lacebacks ativos no arco dentário superior; grupo II 9 sujeitos que utilizaram lacebacks passivos no arco dentário superior; grupo III 19 sujeitos que utilizaram lacebacks ativos no arco dentário inferior e grupo IV 10 sujeitos que utilizaram lacebacks passivos no arco dentário inferior. Para cada indivíduo da amostra foram tomadas duas telerradiografias laterais, uma ao início e outra ao término da fase de nivelamento, com um intervalo médio de 21 meses. Os dados foram coletados utilizando-se o método cefalométrico computadorizado. Para a análise de erros, o método cefalométrico foi repetido em todos os sujeitos da amostra, pelo mesmo operador, com um intervalo mínimo de 15 dias entre as medidas. Os resultados indicaram que as variações observadas foram compatíveis com as estimativas de erros operacionais em estudos cefalométricos. Após a análise estatística e a interpretação dos resultados, verificou-se que, no grupo I, apenas a coroa do primeiro molar superior sofreu um movimento mesial e que tanto a coroa como a raiz do incisivo central superior apresentaram um movimento em direção lingual. No entanto, as inclinações destes dentes não foram alteradas. No grupo II, o primeiro molar superior se manteve estável e somente a coroa do incisivo central superior se movimentou em direção lingual, produzindo uma rotação horária deste dente. No grupo III, observou-se uma mesialização, tanto da coroa como da raiz, e extrusão do primeiro molar inferior, enquanto a posição do incisivo central inferior permaneceu inalterada. As inclinações destes dentes também não foram alteradas. No grupo IV, verificou-se que nem o primeiro molar inferior nem o incisivo central inferior apresentaram variações no sentido ântero-posterior. Verticalmente, houve extrusão apenas do primeiro molar inferior.The purpose of this study was to evaluate the effects of active and passive lacebacks in the biomechanics of the leveling phase, using the MBT technique. The sample was composed of 29 Brazilian subjects (22 female and 7 male), Caucasian, with Class I malocclusion and mean age of 15 years and 5 months. The orthodontic treatment was planned with the extraction of the first premolars, and the leveling phase was performed with stainless steel wire only (0.014, 0.016, 0.018, 0.020 e 0.019 x 0.025). The anchorage control devices used in the upper and lower arches were, respectively, the IHG extraoral appliance and the fixed lingual arch. According to the type of laceback prescription, the sample was divided into four groups: group I 14 subjects in which active lacebacks were used in the upper arch; group II 9 subjects in which passive lacebacks were used in the upper arch; group III 19 subjects in which active lacebacks were used in the lower arch; group IV 10 subjects in which passive lacebacks were used in the lower arch. For each subject of the sample two lateral cephalometric radiographs were taken: one at the beginning and another at the end of the leveling phase, with a mean interval of 21 months. The data were collected using the resources of computerized cephalometry. To perform the analysis of errors, the cephalometric method was repeated in all subjects of the sample, by the same operator, with a minimum interval of 15 days between the measurements. The results revealed that the observed variations were compatible with the estimates of operational errors in cephalometric studies. After statistical analysis and interpretation of the results, it was observed that in group I, only the crown of the upper first molar presented a mesial movement. As to the upper central incisor, both the crown and the root presented a lingual movement. However, the inclination of these teeth was not affected. In group II, the upper first molar remained stable and only the crown of the upper central incisor moved lingually, leading to a clockwise rotation of this tooth. In group III, a mesial movement of both the crown and the root of the lower first molar was observed, along with its extrusion, whereas the position of the lower central incisor remained unchanged. The inclination of these teeth was not affected either. In group IV, it was observed that neither the lower first molar nor the lower central incisor experienced variations in the anteroposterior sense. Vertically, there only was extrusion of the lower first molar.
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Zelenka, Eileen Ann Glasspoole. "Fluoride-releasing materials for orthodontic appliances." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2001. http://dare.uva.nl/document/59287.
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Tsui, Wai-kin, and 徐偉堅. "Bone anchorage for orthodontic tooth movement." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44661605.
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Al-Groosh, D. H. A. "Opportunistic pathogens associated with orthodontic retainers." Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1419096/.
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Orthodontic retainers may be considered as removable implants and confer the same problems as other implants with regard to colonisation by microorganisms. Thus, biofilms forming on their surface may compromise the oral health of patients and jeopardise the efficiency of the therapy. The first part of the project involved a clinical study, a cross-sectional observational cohort, to assess the effect of orthodontic treatment on the oral microbiota and the carriage state of opportunistic pathogens during the course of treatment. High proportions of health-associated species were detected in the retainer group. However, Staphylococcus and Candida species were frequently (69% and 36% respectively) isolated from the retainers and the oral cavity of retainer wearers, where Staphylococcus spp. comprised up to 5% of the microbiota. The increase in Staphylococcus spp. including Methicillin Resistant Staphylococcus aureus (MRSA) on retainers was associated with an increase in numbers of these species on the oral mucosa of the cheek and tongue. Orthodontic retainers could, therefore, be a reservoir for pathogens and act as a source of cross-infection. A series of in vitro investigations were subsequently carried out to evaluate the effect of the surface characteristics of retainer materials, including surface roughness, hydrophobicity and surface free energy, which may affect colonisation by opportunistic pathogens. After polishing the surface of the acrylic substrata the results revealed that Atomic Force Microscope was the most appropriate device to measure the surface roughness of the acrylic and thermoplastic materials in a consistent manner. Additionally, the acid-base interactions, especially the electron donor interaction, influenced the bacterial attachment onto the thermoplastic samples. Finally, assessment of novel antimicrobial-containing acrylic resins was carried out. Firstly, incorporation of chlorhexidine showed a prolonged antimicrobial effect against MRSA but was detrimental to the mechanical properties. Thymol was successfully incorporated in heat cured acrylic materials. It reduced the surface free energy of the modified resin with no effect on the mechanical properties and was strongly antimicrobial against C. albicans. However, it showed a lesser antimicrobial effect against MRSA. This PhD has shown the potential of orthodontic retainers as reservoirs for opportunistic pathogens and that surface characteristics are significant in the retention and potential removal of these pathogens. The use of antimicrobial acrylic materials may be of potential therapeutic benefit following further development.
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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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Forsyth, Gregory C. "Orthodontic bonding to dental gold alloy." Thesis, The University of Sydney, 1987. http://hdl.handle.net/2123/4638.
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Bovenizer, Todd S. "An in-vitro investigation of frictional resistance of self-ligating and ceramic brackets when subjected to different ligation methods and tipping angles." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4467.
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Thesis (M.S.)--West Virginia University, 2006.Title from document title page. Document formatted into pages; contains x, 97 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 69-76).
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Blackburn, James. "IN-VITRO ASSESSMENT OF A NOVEL BRACKET'S EFFECT ON RESISTANCE TO SLIDING." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3722.
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Friction, binding and notching are the factors that contribute to resistance to sliding during orthodontic tooth movement. However, most attempts at reducing resistance aim only to reduce the archwire/ligature friction. In this study, a novel bracket with a unique design aimed to reduce all three components of resistance to sliding. Four types of brackets (passive and active self-ligating, traditionally ligated and the novel bracket, (n=5, each) were tested at 0, 2, 4, 6, and 8ᵒ of tip on a 0.019 x 0.025”archwire. The resistance to sliding values were recorded. At 0ᵒ, the passive self-ligating and novel bracket showed reduced resistance when compared to the traditionally ligated bracket (P< 0.05). At the other angles of tip, no differences were observed among the brackets. These data suggest that the novel bracket could potentially decrease the resistance to sliding during orthodontic treatment and further studies are indicated to test the improved bracket design.
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Ivanov, Pavel. "Investigation of diode laser debonding of ceramic orthodontic brackets." Thesis, NSUWorks, 2012. https://nsuworks.nova.edu/hpd_cdm_stuetd/52.
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A thesis submitted to the College of Dental Medicine of Nova Southeastern University of the degree of Master of Science in Dentistry.
ABSTRACT The significance of this research was to identify the optimal techniques to remove ceramic orthodontic appliances in order to prevent tooth-enamel fracture, pain, and esthetic complications. Discomfort and pain are common occurrences during orthodontic appliance removal. In debonding (bracket removal) appointments, less force, measured as reduced shear bond strength (SBS) is preferable because greater force creates more discomfort and pain. In a previous study, 24.3% of patients reported pain when metallic brackets were removed using a ligature-cutting plier, compared to 12.8% of patients reporting pain when a lift-off instrument was employed. These previous findings demonstrate the need to investigate new debonding removal methods which have less SBS to help reduce the pain experienced by orthodontic patients. Some recent studies have reported that orthodontic bracket debonding causes inevitable damage to the enamel surface. The debonding of ceramic orthodontic brackets can increase the risk of enamel damage. The application of heat to help debond a bracket can increase the temperature of the pulp chamber; this could injure pulp cells and threaten the long term vitality of the affected tooth. The purpose of this in-vitro study was to evaluate the safety and effectiveness of using a diode laser for the debonding of ceramic brackets in relation to the amount of debonding force required, the risk of direct force impact on enamel, and the risk of causing an adverse temperature increase inside the pulp chamber. The central hypothesis I investigated was that using a diode laser would facilitate the debonding of ceramic brackets by decreasing the SBS, increase the adhesive remnant index (ARI), and avoid causing an adverse temperature increase in the pulp chamber. I investigated these parameters with the goal of establishing an effective and safe protocol for debonding ceramic brackets. At present no guidelines exist, I recognized that guidelines are needed for using a diode laser to debond brackets in relation to the power level and duration of lasing. This study tested two types of ceramic brackets; a monocrystalline bracket called Radiance and polycrystalline ceramic bracket called Clarity. These brackets were selected because they are widely available and in common use. The experimental brackets were monocrystalline and polycrystalline: the laser power settings and lasing times were; negative control (not lased), lased at 2.5 watts for 3 and 6 seconds, and lased at 5.0 watts for 3 and 6 seconds. The diode laser treatments had little effect on the debonding SBSs for the removal of the Radiance monocrystalline brackets. Alternatively, the debonding of the Clarity polycrystalline brackets with laser treatment using 2.5 watts for 6 seconds, 5.0 watts for either 3 seconds or 6 seconds reduced the SBS. The debonding of the Radiance monocrystalline brackets with laser treatment using 2.5 watts for 3 seconds, and 5.0 watts for 6 seconds increased the ARI. The debonding of the Clarity polycrystalline brackets with laser treatment using 2.5 watts for 6 seconds, 5.0 watts for 3 seconds and 6 seconds increased the ARI. The increase in pulp chamber temperature likely to cause thermal injury to the pulp cells was measured against Zack and Cohen¡¯s in vivo standards (2.2¢ªC and, 5.5¢ªC).30 When compared to the 2.2¢ªC standard; the debonding of Radiance monocrystalline brackets with laser treatment using 2.5 watts for 3 seconds were within the standard, and the debonding of Clarity polycrystalline brackets using 2.5 watts for 3 seconds was cooler. When compared to the 5.5¢ªC standard, the debonding of Clarity polycrystalline brackets using 2.5 watts for 6 seconds was cooler. The research results showed that using a diode laser for debonding at 2.5 watts for 6 seconds decreased the SBS for Clarity polycrystalline brackets (reduced the force needed for debonding), increased ARI for Clarity polycrystalline brackets (increased adhesive on enamel), and did not increase the pulp chamber temperature by an injurious amount. The difference in the debonding SBS, ARI and pulp chamber temperatures of the two bracket types probably arose because of the difference in the designs of the two bracket pads. My research results demonstrate the long-term need to design brackets with pads which can be removed easily with a diode laser, leave more adhesive on enamel, and that do not cause injurious temperature increases within the pulp chamber. My research results also demonstrate why guidelines for bracket debonding using diode lasers are needed, which limit the power setting and lasing times. The debonding of brackets using diode lasers could benefit orthodontic patients and become more common if it can reduce the risk of tooth fracture, lower the sensation of pain, reduce the amount of enamel damage, and maintain the vitality of teeth in future studies.
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Shirck, Jeffrey Michael. "Survey of Temporary Anchorage Device Utilization in Graduate Orthodontic Programs and Orthodontic Practices in the United States." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1235673960.
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Makinson, Mary. "Preventive and interceptive orthodontics : in relationship to the School Dental Service and the State Orthodontic Service in N.S.W." Thesis, The University of Sydney, 1990. http://hdl.handle.net/2123/4660.
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Mah, Edward. "Investigation of frictional resistance on orthodontic brackets when subjected to variable moments." Morgantown, W. Va. : [West Virginia University Libraries], 2002. http://etd.wvu.edu/templates/showETD.cfm?recnum=2285.
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Thesis (M.S.)--West Virginia University, 2002.Title from document title page. Document formatted into pages; contains x, 101 p. : ill. (some col.). Vita. Includes abstract. Includes bibliographical references (p. 90-100).
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Synnott, Peter William. "The development of an orthodontic screening method." Thesis, The University of Sydney, 1991. http://hdl.handle.net/2123/4765.
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Albert, Jeremy M. "Clinical evaluation of the Prophy-Jet in routine plaque debridement of orthodontic patients." [Gainesville, Fla.]: University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000627.
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Sousa, Meire Alves de. "Analise eletromiografica dos musculos masseter, temporal e orbicular da boca em jovens com maloclusão classe II, 1ª divisão dentaria, apos o uso de aparelho extrabucal de tração occipital." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/290212.
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Orientador: Vania Celia Vieira de SiqueiraTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A eletromiografia de superfície representa um importante instrumento de avaliação da função muscular. No entanto, apresenta limitações, devido à grande variabilidade que ocorre na amplitude do sinal eletromiográfico obtido. Com o intuito de diminuir essa variabilidade, sugere-se a normalização dos dados coletados, que consiste na divisão do sinal eletromiográfico bruto registrado por um valor de referência, expresso em porcentagem, derivado da própria medida do sinal eletromiográfico. Objetivou-se neste estudo avaliar, por meio da eletromiografia, a ocorrência de alterações na atividade eletromiográfica da porção superficial do músculo masséter, da porção anterior do músculo temporal e dos segmentos superior e inferior do músculo orbicular da boca, bilateralmente, em 25 jovens, entre 8 e 10 anos de idade, com maloclusão Classe II, 1ª divisão dentária, após se submeterem ao tratamento ortodôntico com o aparelho extrabucal, comparando-os com um grupo de 25 jovens com oclusão normal, com idade similar. Além de avaliar se o procedimento de normalização dos dados obtidos influencia no resultado final. Para a captação dos sinais eletromiográficos dos músculos masséter e temporal utilizou-se eletrodos de superfície ativos diferenciais simples, e para o músculo orbicular da boca, eletrodos de superfície passivos de Ag/AgCl. Realizou-se a coleta do sinal na situação de repouso, na contração isométrica e na contração isotônica, antes e após o tratamento ortodôntico no grupo com maloclusão e em períodos similares no grupo com oclusão normal. Por meio de software específico, determinou-se o valor da Root Mean Square (RMS) de cada movimento realizado. Submeteu-se os dados iniciais coletados à normalização, comparando-os com os dados iniciais originais, por meio da análise de variância (ANOVA) para parcelas subdivididas Os resultados demonstraram que o procedimento de normalização influenciou a interpretação dos dados ao suprimir as diferenças existentes entre os grupos, reforçando a idéia de que os resultados originais permitiram conclusões mais adequadas do que os dados normalizados. Com base nesses resultados, optou-se pela utilização dos dados originais para avaliar o efeito do tratamento ortodôntico no grupo com maloclusão. Nesta etapa utilizou-se a ANOVA para medidas repetidas com modelos mistos e o teste de Tukey (a=0,05). Observou-se que ocorreu uma diminuição na atividade eletromiográfica de todos os músculos do grupo com maloclusão e com oclusão normal, entretanto esta diferença não apresentou-se estatisticamente significante para o músculo temporal direito e orbicular da boca, segmento superior. Na fase inicial do estudo o grupo com maloclusão apresentou maior atividade elétrica em todos os músculos do que o com oclusão normal, no entanto, essa diferença não apresentou-se significante para o músculo masséter. Não ocorreram diferenças significativas entre os grupos na fase final do experimento. Concluiu-se que o tratamento com o aparelho extrabucal possibilitou a melhora do padrão muscular das jovens com maloclusão Classe II, 1ª divisão dentária.
Abstract: The surface electromyography is an excellent way to evaluate the muscle function. However, it presents limitations, because the great variability in the amplitude of the electromyographic signal obtained. To reduce this variability, has been proposed the normalization of the electromyographic signal. The process consist of dividing the raw electromyographic recorder signal by a reference value expressed as a percentage, derived from measure of the electromyographic signal itself. The purpose of this study was to evaluate electromyographically the action potential of the superficial masseter muscle, the anterior temporal muscle, the orbicularis oris muscle, upper and lower segment, bilaterally, in 25 young females, aged ranging from 8 to 10 years old, with Class II division 1 malocclusion after the treatment with extraoral appliances and to compare them with 25 young females with normal occlusion, with similar aged. And to evaluate if the experiment final results can be influenced by the normalization of electromyographic data. The electromyographic signals of the masseter and temporal muscles were adquired by active single differential surface electrodes, and of the orbicularis oris muscle by passive surface electrodes of the Ag/AgCl. Muscle activity was recorded in resting position, in isometric contraction and in isotonic contraction, before and after orthodontic treatment in the malocclusion group and similar periods in the normal occlusion group. Through of specific software was determined the Root Mean Square (RMS) values of each movement. The initial data collected were submitted to the normalization procedure and were compared with the initial raw data, through of statistical analyses of variance. The results showed that the normalization procedure was able to affect the electromyographic data, suppressing the difference between the groups. This support the idea that the raw data were able to produce better conclusions than normalized data. Thus, the orthodontic treatment of the malocclusion group was evaluated using the raw data, through of statistical analyses of variance and Tukey test (a=0,05). The results showed that there was decrease of the electromyographic activity in all the muscles, in both groups difference between the groups, but that difference was not statistically significant for the right temporal muscle and the orbicularis oris muscle upper segment The muscle activity was higher in the malocclusion group than normal occlusion group in the initial phase, but that difference was not statistically significant for the masseter muscle. In the final phase there was not significant difference between the groups. It was concluding that the treatment with extraoral appliances was able to improve the muscular pattern of the young females with Class II division 1 malocclusion.
Doutorado
Ortodontia
Doutor em Radiologia Odontológica