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Component analysis of craniofacial relations in various malocclusions -

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dc.contributor.author Tarabay, Roula Jihad
dc.date.accessioned 2017-08-30T14:15:49Z
dc.date.available 2017-08-30T14:15:49Z
dc.date.issued 2015
dc.date.submitted 2015
dc.identifier.other b18355663
dc.identifier.uri http://hdl.handle.net/10938/10935
dc.description Thesis. M.Sc. American University of Beirut. Department of Otolaryngology, Head and Neck surgery. Division of Orthodontics and Dentofacial Orthopedics. Faculty of Medicine 2015 W 4 T176c 2015
dc.description Advisor: Joseph Ghafari, Professor and Chair, Orthodontics and Dentofacial Orthopedics ; Committee members: Dr. Rihab Nasr, Assistant Professor, Anatomy, Cell Biology and Physiological Sciences ; Dr. Ramzi Haddad, Assistant Professor, Clinic director, Orthodontics and Dentofacial Orthopedics ; Dr. Abdo Jurjus, Professor, Anatomy, Cell Biology and Physiological Sciences.
dc.description Includes bibliographical references (leaves 113-119)
dc.description.abstract Linked principally to skeletal Class III malocclusion, mandibular macrognathism might exist in other malocclusions.Aims: 1) Characterize the traits of Class III and Class II malocclusions compared to a control group of Class I malocclusion. 2) Explore the existence of mandibular macrognathism in all types of malocclusion and its prevalence in Class III and Class II division 2 types. 3) Demonstrate particular traits to Class II division 2 that set it apart from all other malocclusions.Methods: 322 subjects were divided into 4 malocclusion Classes: I, II division 1, II division 2 (itself stratified into 4 subtypes), and III. Cephalometric linear and angular measurements gauged sizes and positions of the jaws and their relationships to each other. Statistics included a multivariate analysis of variance for group comparisons, frequency distribution, correlations, linear and logistic regressions.Results: Components of Class II division 2 were distinct from other malocclusions: maxilla closer to Class II division 1, mandible closer to Class I and Class III. In adults, 13.88 percent of Class III, 2.77percent of Class II.2, 0percent of Class II.1, had mandibular length (Co-Gn) beyond 1 standard deviation of the mean Class I mandibular length. In Class II.2 27.53percent had mandibular length comparable to that of Class II.1, 56.56percent comparable to that of Class I and 15.94percent to Class III. ANB in Class II.2 in ~60percent of the cases was comparable to Class I ANB (0-4.5˚), and ~40percent to Class II.1 (4.6-10˚). Chin components were characteristic in Class II.2: increased anterior symphyseal angle and distance Go-Pog. Conclusion: The results indicate that Class II division 2 may be a dentoalveolar malocclusion grafted on skeletal patterns ranging across other types of malocclusion. Longitudinal research with a larger sample is warranted. Findings on other malocclusions corroborate previous knowledge.
dc.format.extent 1 online resource (122 leaves)
dc.language.iso eng
dc.relation.ispartof Theses, Dissertations, and Projects
dc.subject.classification W 4 T176c 2015
dc.subject.lcsh Dissertations, Academic.
dc.subject.lcsh Malocclusion.
dc.subject.lcsh Orthodontics, Corrective.
dc.title Component analysis of craniofacial relations in various malocclusions -
dc.type Thesis
dc.contributor.department Department of Orthodontics and Dentofacial Orthopedics
dc.contributor.faculty Faculty of Medicine
dc.contributor.institution American University of Beirut


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