Relevant Thesis-Based Degree Programs
Graduate Student Supervision
Doctoral Student Supervision
Dissertations completed in 2010 or later are listed below. Please note that there is a 6-12 month delay to add the latest dissertations.
BackgroundDental movement and position analyses are crucial for both clinical and research reasons. Previous studies have used X-rays, including cephalometric radiographs, CBCT, or the digital model superimposition, to assess dental movements and positions. In this dissertation, we develop novel three-dimensional (3D) methodologies using relatively stable landmarks for maxillary and mandibular dentition superimposition, dental movement measurements, and their applications in assessing the efficacy of clear aligner treatment. MethodsThis dissertation consists of a literature review (chapter 1), maxillary dentition (chapter 2), and mandibular dentition (chapter 3) methodologies for superimposition and dental tooth movement measurement and their application in assessing the efficacy of Invisalign treatment. Additionally, the construction of the long axes of different tooth parts in the anterior segment was demonstrated, compared, and discussed (chapter 4). Finally, chapter 5 includes a discussion, summary, overall strengths and limitations, clinical implications, future directions, and the study’s conclusionResultsOur research projects developed novel methodologies to assess tooth movement in maxillary and mandibular dentitions, with high intra- and inter-examiner correlation coefficients (ICCs) agreement. Anteroposterior (AP) and buccolingual translational movements of all posterior teeth appeared to be accurate, with insignificant differences between ClinCheck® predicted and post-treatment digital models (P=1.000). Rotation and torque movements were less accurate with statistical significance (P=0.0012 and 0.00029, respectively). For the mandibular dentition, premolar rotation, incisor tipping, and molar AP movement showed a significant prediction difference at the 5% level. In terms of the long axis measurement, the long axis of the “Crown” appeared to be the furthest from the tooth composite long axis for the “Canine” when compared to the other anterior teeth (P=
Master's Student Supervision
Theses completed in 2010 or later are listed below. Please note that there is a 6-12 month delay to add the latest theses.
Introduction: Maxillary expansion is common in orthodontic practice and there are many different expansion protocols, including Alternating Rapid Maxillary Expansion and Constriction (Alt-RMEC). Objectives: to analyze the dentoalveolar, skeletal and circummaxillary sutural changes, using retrospective Cone Beam Computed Tomography (CBCT) records, to compare 2 different maxillary expansion protocols: conventional Rapid Maxillary Expansion (RME) and Alt-RMEC. Methods: Data was collected from 34 growing Class III (maxillary deficient) patients, aged between 7.2 – 12.5 years old, who were randomly 1:1 allocated to either treatment group. Pre-treatment (T0) and post-treatment (T1) CBCT records were used to measure dentoalveolar, skeletal and circummaxillary sutural variables. Cervical Vertebral Maturation Stage (CVMS) and Mid-Palatal Suture Density (MPSD) ratio were measured using pre-treatment CBCTs. Differences between the two protocols were analyzed using students’ t-tests and linear regression models. Results: both expansion protocols produced pyramidal expansion patterns, both anterior-posteriorly and inferior-superiorly, except at the anterior nasal level where Alt-RMEC resulted in parallel expansion. Alt-RMEC produced statistically and clinically significantly less amount of maxillary 1st molar tipping (P
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