Academic literature on the topic 'Tooth angulation'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Tooth angulation.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Tooth angulation"
1
Soganci, Ahmet Ertan, Ayse Selenge Akbulut, and Gokcen Sahin. "A novel method for measuring tooth angulation in permanent mandibular second molars with delayed tooth eruption." Journal of Orthodontics 48, no. 3 (April 15, 2021): 260–67. http://dx.doi.org/10.1177/14653125211003911.
Full textAbstract:
Objective: To investigate the effect of angulation of permanent mandibular second molars (MM2) on eruption problems and investigate a new method of measuring MM2 angulation for the diagnosis and evaluation of delayed tooth eruption (DTE) for easy use in dental practice. Design: Retrospective study. Setting: Department of Orthodontics, Necmettin Erbakan University. Participants: A total of 98 patients aged 9–18 years. Methods: Patients with 64 permanent MM2s with delayed eruption problems were included in the study group. The control group consisted of patients with 83 normally erupted teeth. In addition, a sub-group, consisting of 23 patients showing unilaterally delayed eruption of the same teeth, was set as a split-mouth group. All patients with unilateral delayed eruption of second molar teeth were selected from the study group to form the sub-group. Angulations of permanent MM2s were measured on panoramic radiographs with two measurement methods: (1) a new method; and (2) a previously accepted method. The comparison of the study and control groups was performed by Mann–Whitney U-test and the split-mouth group was analysed with the paired t-test. The P value was set at 0.05 for statistical significance. Results: Measurements of the tooth angulation values of the study group were significantly higher than in the control group for both measurement methods ( P < 0.001). In addition, in the split-mouth group, angulation values of delayed eruption side were significantly higher than the erupted side ( P < 0.001). Conclusion: Increased angulations of permanent MM2s could be associated with delayed eruption problems of these teeth. This new method could be useful in clinical dentistry to determine the eruption evaluation of lower second molars.
2
Pawinru, Ardiansyah S. "Angulation change of the third molar tooth in orthodontic treatment." Journal of Dentomaxillofacial Science 2, no. 1 (April 1, 2017): 40. http://dx.doi.org/10.15562/jdmfs.v2i1.448.
Full textAbstract:
Objective : Impaction of the third molar tooth mandibular is often found in patients with orthodontic treatment. In orthodontic treatment, extraction cases of impaction of the third molar tooth are usually performed, but the patients often refuse this extraction. Extraction of premolar has a good effect on the third molar mandibular angulation during treatment.Material and Methods : This study is a retrospective clinical study with descriptive analytic to find out the effect of the first mandibular premolar tooth extraction to angulation change of the third molar mandibular in orthodontic treatment with a standard edgewise method. Angulation change was performed by comparing the third molar mandibular angulation before and after orthodontic treatment with panoramic radiographs. Angulation of the third molar tooth mandibular was calculated from the angle formed between the long axis of the tooth with the reference line infraorbita.Results : The sample comprised 60 of impacted mandibular third molar region of the left and right regions of 30 patients who had been treated declared cured in clinic of orthodontic specialist of Dentistry Faculty Padjadjaran University. The sample was divided into three (3) groups of patients before treatment angulation of the third molar tooth mandibular under 300, 300 to 600 and above 60o, then measured change of angulation and observed whether it increased, fixed or decreased. Results were analyzed by T- test and Wilcoxon test showed that there was a significant change in angulation of the third molar mandibular in orthodontic treatment with the first premolar tooth mandibular extraction.Conclusion : This study is that the first premolar tooth mandibular extraction affects the angulation of the third molar tooth mandibular after orthodontic treatment.
3
Sardar, Tariq, Gulrukh Sheikh, Saddique Aslam, Numan Muhammad Khan, and Javed Akhtar Rana. "Pattern of Angulations and Common Indications for Extraction of Impacted Mandibular Third Molar at KMU-Institute of Dental Sciences, Kohat." Journal of Islamabad Medical & Dental College 8, no. 2 (June 27, 2019): 79–83. http://dx.doi.org/10.35787/jimdc.v8i2.360.
Full textAbstract:
Background: The extraction of an impacted mandibular third molar (MTM), with associated pathologies or clinical manifestations is an important and one of the most frequent decisions in dentistry. The angle formed by the longitudinal axis of second and third molar is used to determine angulation of impacted MTM. The aim of this study was to identify the pattern of angulations of impacted mandibular third molar and common indications for extraction associated with these angulations.Material and Methods: This descriptive cross-sectional study was carried out at Department of Oral & Maxillofacial Surgery, Khyber Medical University Institute of Dental Sciences, Kohat, Khyber Pakhtunkhwa (KP) from November 2017 to July 2018. A total of 349 patients presenting with impacted mandibular third molars were included in this study. Name, age, gender, address, the angulation of the impacted tooth and the indication for extraction of the impacted tooth were recorded. Data comprising of qualitative and quantitative variables were analyzed using SPSS version 17.Results: Out of 349 patients, 206 were male and 143 females, with the male to female ratio of 1.4:1. The age range of the patients was from 18 years to 60 years with a mean age of 26 ± 6 years. The most common age group with impacted third molar was ≤ 25 years followed by 26 to 30 years’ age group. The most common angulation was mesioangular followed by vertical, horizontal and distoangular impacted mandibular third molar. Pericoronitis was the most common indication for extraction in all angulations except horizontal impaction where root resorption of the second molar was more common.Conclusion: Mesioangular is the most common angulation in impacted mandibular third molars. Pericoronitis is the main indication for all angulations of impacted mandibular third molars except horizontal angulation, occurring mostly in the third decade of life.
4
Owens, Ann Marie, and Ama Johal. "Near-End of Treatment Panoramic Radiograph in the Assessment of Mesiodistal Root Angulation." Angle Orthodontist 78, no. 3 (May 1, 2008): 475–81. http://dx.doi.org/10.2319/040107-161.1.
Full textAbstract:
Abstract Objectives: To test the hypothesis that there is no difference between the actual mesiodistal root angulation and the mesiodistal root angulation as measured on the panoramic radiograph. Materials and Methods: A typodont dentition was set up into a Class I occlusion. Wire struts were placed on the buccal surface of each tooth to represent their long axes. The dentition was fixed into a natural skull for imaging. The radiographic and true mesiodistal angulation of each tooth to a horizontal reference plane (the arch wire) was measured using a coordinate measuring machine (CMM). The mesiodistal root positions were then altered to a more mesial and then more distal position and the measurements were repeated. Results: Only 26.7% of the radiographic root angulations were within the clinically acceptable angular variation range of ±2.5°. The greatest variation in the upper arch occurred in the canine-premolar area where the roots were projected as being more divergent. The greatest variation in the lower arch occurred in the lateral incisor-canine region where these roots were projected as being more convergent. The extent of radiographic distortion is statistically greater in the lower arch than in the upper arch in the ideal (P ≤ .05) and distal (P ≤ .01) root positions. Conclusions: The hypothesis is rejected. There is a clinically significant variation between the radiographic and the true root angulations recorded. Caution is advised when interpreting mesiodistal root angulation using this radiograph.
5
Nohadani, Nasila, Yango Pohl, and Sabine Ruf. "Displaced Premolars in Panoramic Radiography—Fact or Fallacy?" Angle Orthodontist 78, no. 2 (March 1, 2008): 309–16. http://dx.doi.org/10.2319/030807-117.1.
Full textAbstract:
Abstract Objective: To test the null hypothesis that there is no difference between premolar position visualized on panoramic radiographs (PRs) and lateral headfilms (LHs). Materials and Methods: The prevalence of differences in the direction of crown angulation between PR and LH was assessed. Furthermore, brass wire markers with different sagittal and transverse angulations were placed in a dry skull. With the markers in place, LHs and PRs were taken. Results: A difference in the direction of crown angulation of unerupted second premolars between PR and LH occurred in 19.5% of patients. The reason for the angulation differences is a buccolingual orientation of the tooth, which appears as a mesiodistal angulation on the PR. Conclusion: The null hypothesis was rejected since in one-fifth of the patients premolar projection differs between the panoramic radiograph and the lateral headfilm.
6
BATUBARA, Fitri Yunita, and Dewi KARTİKA. "Root morphology analysis of posterior teeth using intraoral periapical radiograph." Journal of Syiah Kuala Dentistry Society 7, no. 2 (January 11, 2023): 93–97. http://dx.doi.org/10.24815/jds.v7i2.30232.
Full textAbstract:
Oral and dental health problems are still a part of ongoing national health issues in Indonesia.Through endodontic treatment, also called root canal treatment, a decayed tooth can still be preserved and restoredto its original form. It is done if the dental infection has spread into the pulp or the tooth has become nonvital due totrauma or accident. Root morphology is one of the main concerns before performing endodontic treatment. Aperiapical radiograph taken with bisecting and paralleling techniques is the first method in intraoral radiographicexamination to assist dental diagnosis and case management. This research aimed to analyze the mean length ofposterior teeth using an intraoral periapical radiograph and the difference in posterior teeth length in differentvertical angulations. A total of four extracted lower premolars and four extracted lower molars served as samples inthis analysis. They were mounted in an occluder, and a periapical radiograph was obtained using paralleling andbisecting technique with vertical angulation of -20, -15, -10, -5, 0, +5, +10, +15, and +20. The tooth length wasmeasured from the crown's highest point to the tooth apex's lowest end. Data obtained was then calculated usingSPSS. The result showed that the mean length of the lower premolar and molar was longer if the vertical angulationreached +20. Analysis with one-way ANOVA for the difference in the length of premolars, mesial root, and distalroot of lower molars between a direct measurement with digital caliper and measurement on periapical radiographstaken with paralleling technique and bisecting technique in all vertical angulations showed a p-value of 0,05.There were no significant differences in the mean length of lower premolars and the mesial and distal root of lowermolars between direct measurement using a digital caliper and measure on periapical radiographs taken withparalleling technique and bisecting technique in vertical angulations of -15, -10, -5, 0, +5, +10, +15, and +20.KEYWORDS: Vertical angulation, posterior tooth root morphology, periapical radiograph
7
Abulohom, Faisal, Hesham Mohammed Al-Sharani, Zakarya Al-Muaalemi, Abdalhaq Hussin Alhasani, Nassr Abdalwhab Al-Hutbany, Mubarak Ahmed Mashrah, Ekaterina Diachkova, and Tenglong Hu. "Prevalence and Pattern of Maxillary Wisdom Tooth Impaction and Angulation in Relation to the Maxillary Sinus among Yemeni Students." Research, Society and Development 11, no. 10 (August 9, 2022): e522111030579. http://dx.doi.org/10.33448/rsd-v11i10.30579.
Full textAbstract:
The goal of this study was to determine the prevalence of maxillary third molar impaction and angulation, as well as its relationship to the maxillary sinus, in a group of Yemeni students. Panoramic x-rays were used to assess 200 students, 102 men and 98 females, in this retrospective investigation. Chi-square tests were used to assess age, gender, maxillary sinus approximation to maxillary third molar roots, depth of impaction, and angulation. A total of 327 maxillary third molars were examined; the most congenitally missing maxillary third molar was on the right side, and females (10.25%) had more maxillary third molars engaged in the maxillary sinus than males (8.0%) (4.9%). Type A (52.9%) was the most common according to Pell and Gregory's classification, although vertical angulations of the maxillary third molar were seen more frequently (85.32%). Congenitally missing maxillary third molars are more common in females, and position A was the most common among the maxillary third molars on a vertical level.
8
Kim, Dong Mok, Kyung Duk Park, and Oh Won Kwon. "Assessment of mesiodistal tooth angulation on the panoramic radiograph." Clinical Orthodontics and Research 3, no. 3 (August 2000): 153–54. http://dx.doi.org/10.1034/j.1600-0544.2000.30307.x.
Full text
9
Shepherd, Norman J., Vincent J. Morgan, and Robert J. Chapman. "ANGULATION ASSESSMENT OF ANTERIOR SINGLE TOOTH ROOT FORM IMPLANTS." Implant Dentistry 4, no. 1 (1995): 52–56. http://dx.doi.org/10.1097/00008505-199504000-00009.
Full text
10
Shepherd, N. J., V. J. Morgan, and R. J. Chapman. "Angulation assessment of anterior single tooth root form implants." Implant Dentistry 4, no. 1 (1995): 66. http://dx.doi.org/10.1097/00008505-199504000-00022.
Full textDissertations / Theses on the topic "Tooth angulation"
1
Christensen, Shane R. "An in vitro comparison of working length accuracy between a digital system and conventional film when vertical angulation of the object is variable." Connect to resource online, 2009. http://hdl.handle.net/1805/1926.
Full textAbstract:
Thesis (M.S.D.)--Indiana University School of Dentistry, 2009.Title from PDF t. p. (viewed Aug. 21, 2009) Advisor(s): Mychel Vail, Acting Chair of the Research Committee, Joseph Legan, Kenneth Spolnik, Susan L. Zunt, Edwin Parks. Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 109-120).
2
Sella, Rodrigo Castellazzi [UNESP]. "Avaliação ortopantomográfica das angulações mesiodistais de caninos, pré-molares e molares inferiores com e sem a presença dos terceiros molares." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/95783.
Full textAbstract:
Made available in DSpace on 2014-06-11T19:27:54Z (GMT). No. of bitstreams: 0
Previous issue date: 2005-11-17Bitstream added on 2014-06-13T18:32:10Z : No. of bitstreams: 1
sella_rc_me_araca.pdf: 1441654 bytes, checksum: cdc70411fdffc721aad7006bd91c1278 (MD5)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A presente pesquisa teve como objetivo comparar os valores médios normais das angulações mesiodistais dentárias, propostos por Ursi em 1989, com as angulações mesiodistais de caninos, pré-molares e molares inferiores em indivíduos com e sem a presença dos terceiros molares inferiores. Além disso, foram comparados os valores das angulações mesiodistais de caninos, pré-molares e molares inferiores nestas duas situações. Para a realização deste trabalho, foram utilizadas 40 radiografias ortopantomográficas de indivíduos de ambos os gêneros que não receberam tratamento ortodôntico, divididos em dois grupos: Grupo I, constituído por 20 radiografias que não apresentavam os terceiros molares inferiores e Grupo II, formado por 20 radiografias com os terceiros molares inferiores presentes. Para realização das mensurações, uma folha de papel de acetato Ultraphan foi adaptada sobre cada radiografia, permitindo o traçado do contorno externo da imagem da mandíbula, forames mentonianos, linha intermentoniana, contorno de caninos, pré-molares e molares inferiores e longos eixos dos dentes. Os desenhos anatômicos foram digitalizados e os ângulos formados pela intersecção dos longos eixos dos dentes com a linha intermentoniana foram medidos pelo programa AutoCAD 2000. A análise dos resultados e a análise estatística permitiram concluir que ambos os Grupos exibiram pré-molares e molares inferiores mais angulados em sentido mesial quando comparados à oclusão normal. Por outro lado, a angulação mesiodistal de caninos inferiores mostrou-se semelhante àquela apresentada em casos de oclusão normal. Os dois Grupos, quando comparados entre si, exibiram valores angulares dos caninos, pré-molares e molares inferiores semelhantes, de modo que a presença dos terceiros molares não exerceu influência sobre estas angulações mesiodistais dentárias.
The present research had as objective compare the normal medium values of the mesiodistal axial angulation, proposed by Ursi in 1989, with the mesiodistal axial angulation of canine teeth, premolar and inferior molars in individuals with and without the presence of the third inferior molars. Besides, the values of the mesiodistal axial angulation of canine, premolar and inferior molars were compared in these two situations. For the accomplishment of this work, they were used 40 panoramic x-rays from individuals of both sexes that didn't receive orthodontic treatment, divided in two groups: Group I, constituted by 20 x-rays that didn't present the third inferior molars and Group II, formed by 20 x-rays with the presence of the third inferior molars. For accomplishment of the measurements, a leaf of paper of acetate Ultraphan was adapted on each x-ray, allowing the plan of the mandibles' external outline, mental foramen, reference line passing through the centers of the mental foramens, outline of canine, premolar and inferior molars and long axes of these teeth. The anatomical drawings' digitization allowed the measurement of the angles formed by the encounter of the long axes of the teeth with the reference line through AutoCAD 2000 program. The results analysis and the statistical analysis allowed concluding that both Groups exhibited inferior premolar and molars more angulated in mesial direction when compared to the normal occlusion. On the other hand, the mesiodistal axial angulation of inferior canine teeth was shown similar that presented in cases of normal occlusion. The two Groups, when compared amongst themselves, exhibited similar angular values of the canine teeth, premolar and inferior molars, so that the presence of the third molars didn't exercise influence on these dental angulations.
3
Sella, Rodrigo Castellazzi. "Avaliação ortopantomográfica das angulações mesiodistais de caninos, pré-molares e molares inferiores com e sem a presença dos terceiros molares /." Araçatuba : [s.n.], 2005. http://hdl.handle.net/11449/95783.
Full textAbstract:
Orientador: Osmar Aparecido CuoghiBanca: Marcos Rogério de Mendonça
Banca: Claudenir Rossato
Resumo: A presente pesquisa teve como objetivo comparar os valores médios normais das angulações mesiodistais dentárias, propostos por Ursi em 1989, com as angulações mesiodistais de caninos, pré-molares e molares inferiores em indivíduos com e sem a presença dos terceiros molares inferiores. Além disso, foram comparados os valores das angulações mesiodistais de caninos, pré-molares e molares inferiores nestas duas situações. Para a realização deste trabalho, foram utilizadas 40 radiografias ortopantomográficas de indivíduos de ambos os gêneros que não receberam tratamento ortodôntico, divididos em dois grupos: Grupo I, constituído por 20 radiografias que não apresentavam os terceiros molares inferiores e Grupo II, formado por 20 radiografias com os terceiros molares inferiores presentes. Para realização das mensurações, uma folha de papel de acetato "Ultraphan" foi adaptada sobre cada radiografia, permitindo o traçado do contorno externo da imagem da mandíbula, forames mentonianos, linha intermentoniana, contorno de caninos, pré-molares e molares inferiores e longos eixos dos dentes. Os desenhos anatômicos foram digitalizados e os ângulos formados pela intersecção dos longos eixos dos dentes com a linha intermentoniana foram medidos pelo programa AutoCAD 2000. A análise dos resultados e a análise estatística permitiram concluir que ambos os Grupos exibiram pré-molares e molares inferiores mais angulados em sentido mesial quando comparados à oclusão normal. Por outro lado, a angulação mesiodistal de caninos inferiores mostrou-se semelhante àquela apresentada em casos de oclusão normal. Os dois Grupos, quando comparados entre si, exibiram valores angulares dos caninos, pré-molares e molares inferiores semelhantes, de modo que a presença dos terceiros molares não exerceu influência sobre estas angulações mesiodistais dentárias.
Abstract: The present research had as objective compare the normal medium values of the mesiodistal axial angulation, proposed by Ursi in 1989, with the mesiodistal axial angulation of canine teeth, premolar and inferior molars in individuals with and without the presence of the third inferior molars. Besides, the values of the mesiodistal axial angulation of canine, premolar and inferior molars were compared in these two situations. For the accomplishment of this work, they were used 40 panoramic x-rays from individuals of both sexes that didn't receive orthodontic treatment, divided in two groups: Group I, constituted by 20 x-rays that didn't present the third inferior molars and Group II, formed by 20 x-rays with the presence of the third inferior molars. For accomplishment of the measurements, a leaf of paper of acetate "Ultraphan" was adapted on each x-ray, allowing the plan of the mandibles' external outline, mental foramen, reference line passing through the centers of the mental foramens, outline of canine, premolar and inferior molars and long axes of these teeth. The anatomical drawings' digitization allowed the measurement of the angles formed by the encounter of the long axes of the teeth with the reference line through AutoCAD 2000 program. The results analysis and the statistical analysis allowed concluding that both Groups exhibited inferior premolar and molars more angulated in mesial direction when compared to the normal occlusion. On the other hand, the mesiodistal axial angulation of inferior canine teeth was shown similar that presented in cases of normal occlusion. The two Groups, when compared amongst themselves, exhibited similar angular values of the canine teeth, premolar and inferior molars, so that the presence of the third molars didn't exercise influence on these dental angulations.
Mestre
4
Sahr, Sabine. "Vergleichende computertomografische Untersuchungen zur Anatomie der tränenableitenden Wege bei brachyzephalen Hunden." Doctoral thesis, Universitätsbibliothek Leipzig, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-143903.
Full textAbstract:
This study aimed to investigate the course of the nasolacrimal drainage system in three different brachycephalic dog breeds in comparison to normocephalic dogs and to draw conclusions on potentially adverse consequences for the drainage function. A computed tomographic-dacryocystography (CT-DCG) was performed in 51 brachycephalic dogs, consisting of 23 Pugs, 18 French and 10 English bulldogs. Six normocephalic dogs of different breeds and body size served as a comparison. Two- and three dimensional images were obtained and evaluated. Several parameters (length, angulation, gradient) were used to describe the nasolacrimal drainage system and to quantify distinctions between different breeds. Furthermore several additional characteristics were analysed, including the relative position of lacrimal foramen and nasolacrimal ostium, crossing of the nasolacrimal duct below the root of the upper canine tooth, the patency of the lacrimal drainage system and the presence of an accessory opening. While the length of the nasolacrimal duct is substantially reduced in brachycephalic dogs, their lacrimal canaliculi have much larger dimensions than those of normocephalic dogs. Additionally varying parts of the nasolacrimal drainage system follow an inverse direction in short-headed dogs, giving the entire nasolacrimal apparatus a characteristic U- or V-shaped appearance. The nasolacrimal duct exhibits a much steeper alignment in brachycephalic dogs compared to normocephalic ones. This strong slope however does not interfere with drainage function because of a consistently present accessory opening, being the main or only outflow pathway in all brachycephalic dogs and hence facilitating proper tear drainage regardless of the steepness.
5
McKee, Ian William. "The accuracy of panoramic radiography in the assessment of mesiodistal tooth angulations at varying horizontal and vertical head positions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60468.pdf.
Full text
6
Karim, Ed. "Evaluation of tooth angulation measured on cone beam computed tomography and panoramic radiographs." Thesis, 2014. http://hdl.handle.net/2440/86272.
Full textAbstract:
Panoramic radiographs have been used for decades in the field of dentistry and in orthodontics in particular. Panoramic radiography use in orthodontics includes (but is not limited to): pre-treatment dental assessment, dental age estimation, the detection of dental anomalies, the identification of missing and impacted teeth, the prognosis for unerupted teeth, periodontal tissue assessment and pre-finishing root parallelism. The determination and validity of root position has been debated by many authors and practitioners. Knowledge regarding the production of panoramic radiographs questions whether they are the best way of judging tooth angulation. Aims: The main aim of this study was to assess dental angulation measurements generated by two panoramic x-ray machines. An attempt would be made to correct appraisal differences and, therefore, render the films more useful in providing the necessary diagnostic information to achieve optimal orthodontic treatment results. Methods: A dry human skull with an inserted typodont was imaged using two different panoramic machines in addition to a CBCT machine. Teeth within the typodont had metal markers attached to their coronal and apical ends. The markers and therefore the long axes of the teeth were identified. Teeth were divided into 5 groups (Anterior-Anterior, Anterior- Premolar, Premolar-Premolar, Premolar-Molar and Molar-Molar). The angles between adjacent teeth were measured on an “OPG extrapolation” produced by tracing markers directly on panoramic radiographs. The same measurements were performed on “Focal Trough Specific extrapolations” which were produced by applying the panoramic machine-specific focal trough around the coordinates of the coronal and apical markers. Each machine had its own “OPG extrapolation” and “Focal Trough Specific extrapolation”. The four extrapolations were compared. Results: A wide range of variation in tooth angulation was found between the measurements of each machine. For the Carestream machine, the Premolar-Molar and Molar-Molar regions were represented poorly on panoramic radiographs. While for the Vatech machine, Premolar- Premolar and Anterior-Premolar were the groups represented least accurately on the panoramic radiographs. Conclusion: Panoramic radiographs should be interpreted with caution when assessing tooth angulations. Panoramic x-ray machine manufacturers should be encouraged to provide a range of error values to help practitioners have a better understanding of the limitations of panoramic radiographic interpretation.Thesis (D.Clin.Dent.) -- University of Adelaide, School of Dentistry, 2014
7
Christensen, Shane R. (Robert) 1977. "An in vitro comparison of working length accuracy between a digital system and conventional film when vertical angulation of the object is variable." Thesis, 2009. http://hdl.handle.net/1805/1926.
Full textAbstract:
Indiana University-Purdue University Indianapolis (IUPUI)Accurate determination of working length during endodontic therapy is critical in achieving a predictable and successful outcome. Working length is determined by the use of electronic apex locators, tactile perception, knowledge of average tooth lengths and dental radiography. Due to the increasing use of digital radiography in clinical practice, a comparison with conventional film in working length determination is justified. The purpose of this study is to determine if there is a difference between Schick digital radiography and Kodak Ultra-speed film in the accurate determination of working lengths when vertical angulation of the object is variable. Twelve teeth with #15 K-flex files at varying known lengths from the anatomical apex were mounted in a resin-plaster mix to simulate bone density. A mounting jig for the standardization of projection geometries allowed for exact changes in vertical angulation as it related to the object (tooth) and the film/sensor. Each tooth was imaged using Schick CDR and Kodak Ultra-speed film at varying angles with a consistent source-film distance and exposure time. Four dental professionals examined the images and films independently and measured the distance from the tip of the file to radiographic apex and recorded their results. The error in working length was calculated as the observed value minus the known working length for each tooth type. A mixed-effects, full-factorial analysis of variance (ANOVA) model was used to model the error in working length. Included in the ANOVA model were fixed effects for type of image, vertical angulation, and the interaction of angle and film type. Tooth type and examiner were included in the model as random effects assuming a compound symmetry covariance structure. The repeatability of each examiner, for each film type, was assessed by estimating the intra-class correlation coefficient (ICC). The ICC was determined when 12 randomly selected images and radiographs were reevaluated 10 days after initial measurements. The repeatability of each examiner for Schick CDR was good with ICCs ranging from 0.67 to 1.0. Repeatability for the conventional film was poor with ICCs varying from -0.29 to 0.55. We found the error in the working length was not significantly different between film types (p = 0.402). After adjusting for angle, we found that error in the working length from the digital image was only 0.02 mm greater (95-percent CI: -0.03, 0.06) than the conventional film. Furthermore, there was not a significant difference among the angles (p = 0.246) nor in the interaction of image type with angle (p = 0.149). Based on the results of our study, we conclude that there is not a statistically significant difference in determining working length between Schick CDR and Kodak Ektaspeed film when vertical angulation is modified.
8
Vidal, Maria Beatriz Ferreira. "Avaliação da angulação dos gérmenes dos terceiros molares através da análise de radiografias panorâmicas." Master's thesis, 2016. http://hdl.handle.net/10400.14/21787.
Full textAbstract:
Introdução: A avaliação radiográfica da presença, posição e grau de formação do terceiro molar pode ser uma mais-valia na previsão da necessidade de germectomia.
Objetivos: Este estudo visa analisar radiograficamente os gérmenes dos terceiros molares, caracterizando a sua presença/ausência e estadio de mineralização (Nolla) e classificá-los de acordo com a sua orientação (classificação de Winter) e angulação.
Métodos: Foi realizado um estudo observacional transversal analítico através da análise de 540 radiografias panorâmicas de pacientes da Clínica Dentária Universitária do ICS - Viseu com idades entre os 4 e os 21 anos.
Resultados: Em todos os gérmenes dos terceiros molares o estadio 0 de Nolla acontece na faixa etária até 9 anos e vai aumentando até à faixa etária dos 16-21 anos. A evolução dos gérmenes dos terceiros molares superiores inicia-se mais precocemente que a dos gérmenes dos terceiros molares inferiores. A orientação mais comum nos gérmenes dos terceiros molares superiores foi a vertical, seguida da distal. Nos gérmenes dos terceiros molares inferiores, a orientação mais comum foi a mesial e a vertical. A angulação média pelo ângulo formado entre o plano oclusal do gérmen do terceiro molar e o longo eixo do segundo molar, do dente 38 foi de 69º e do dente 48 foi de 66º. A angulação média pelo ângulo formado entre o longo eixo do gérmen do terceiro molar e o longo eixo do segundo molar, do dente 38 foi de 21º e do dente 48 foi de 20º.
Conclusão: A avaliação da necessidade de germectomia deve ser ponderada para cada paciente com critérios e metodologias consistentes de angulação e orientação dos gérmenes dos terceiros molares.Introduction: The radiographic evaluation of the presence, position and developmental stage of the third molar can be useful for predicting the need of a germectomy. Objective: The aim of this study is to radiographically analyze the third molar tooth germ, describing its presence/absence and mineralization stage (Nolla’s developmental stages) and classify them according to their orientation (Winter’s classification) and angulation. Methodology: We conducted a cross-sectional observational analytical study by analysing 540 panoramic radiographs of patients with ages between 4 and 21 years old from ICS-Viseu’s University Dental Clinic. Results: In all third molars tooth germ Nolla’s stage 0 is observed in the age group up to 9 years and increases until the age group of 16-21 years. The evolution of upper third molars tooth germ begins earlier than that of the lower third molars tooth germ. The most common orientation in the upper third molars tooth germ was the vertical, then the distal. In the lower third molars tooth germ, the most common orientation were mesial and vertical. When using the angle formed between the occlusal plane of the third molar tooth germ and the long axis of the second molar, the average angle of the tooth 38 was 69º while the one of the tooth 48 was 66º. The average angle by angle formed between the long axis of third molar tooth germ and the long axis of the second molar, was 21º for the tooth 38 and 20º for the tooth 48. Conclusion: The evaluation of the need for germectomy should be considered for each patient with consistent criteria and methodologies for angulation and orientation of the third molar tooth germ.
9
Sahr, Sabine. "Vergleichende computertomografische Untersuchungen zur Anatomie der tränenableitenden Wege bei brachyzephalen Hunden." Doctoral thesis, 2013. https://ul.qucosa.de/id/qucosa%3A12470.
Full textAbstract:
This study aimed to investigate the course of the nasolacrimal drainage system in three different brachycephalic dog breeds in comparison to normocephalic dogs and to draw conclusions on potentially adverse consequences for the drainage function. A computed tomographic-dacryocystography (CT-DCG) was performed in 51 brachycephalic dogs, consisting of 23 Pugs, 18 French and 10 English bulldogs. Six normocephalic dogs of different breeds and body size served as a comparison. Two- and three dimensional images were obtained and evaluated. Several parameters (length, angulation, gradient) were used to describe the nasolacrimal drainage system and to quantify distinctions between different breeds. Furthermore several additional characteristics were analysed, including the relative position of lacrimal foramen and nasolacrimal ostium, crossing of the nasolacrimal duct below the root of the upper canine tooth, the patency of the lacrimal drainage system and the presence of an accessory opening. While the length of the nasolacrimal duct is substantially reduced in brachycephalic dogs, their lacrimal canaliculi have much larger dimensions than those of normocephalic dogs. Additionally varying parts of the nasolacrimal drainage system follow an inverse direction in short-headed dogs, giving the entire nasolacrimal apparatus a characteristic U- or V-shaped appearance. The nasolacrimal duct exhibits a much steeper alignment in brachycephalic dogs compared to normocephalic ones. This strong slope however does not interfere with drainage function because of a consistently present accessory opening, being the main or only outflow pathway in all brachycephalic dogs and hence facilitating proper tear drainage regardless of the steepness.
Book chapters on the topic "Tooth angulation"
1
Wah Lim, Tong, Budi Aslinie Md Sabri, and Rohana Ahmad. "The effect of mandibular angulation on gonial angle and tooth length measurement of dental panoramic radiographs." In Bioresources Technology in Sustainable Agriculture, 167–75. Waretown, NJ: Apple Academic Press, 2017.: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781315365961-12.
Full text