Graduation Date

Fall 12-15-2023

Document Type


Degree Name

Master of Science (MS)


Medical Sciences Interdepartmental Area

First Advisor

Po-Jung Chen, DDS, MDS, MDentSc

Second Advisor

James Wahl III, PhD

Third Advisor

Meenakshi Vishwanath, BDS, MDS, MDentSc

Fourth Advisor

Benjamin Kwok, PhD


Facial asymmetry is apparent when there is a clinically significant variation between the two halves of the face. There can be varying degrees of facial asymmetry and mild asymmetry can be treated by orthodontics alone. For severe facial asymmetry a combination of orthodontics and orthognathic surgery may be necessary. The condyle must be in a stable position following surgery to have functional and structural stability and prevent relapse. This research proposal is to perform a retrospective CBCT study on the displacement of the condyle following orthognathic surgery in patients with facial asymmetry. The CBCTs were obtained from Taipei Veterans General Hospital in Taiwan from patients who have received orthognathic surgery in the past 5 years. A total of 84 CBCTs were analyzed. CBCTs were obtained at four timepoints for each patient: initial (T1), after decompensation (T2), after orthognathic surgery (T3) and post-treatment (T4). Linear and Angular measurements were taken at timepoints T1-T4. The following linear measurements were compared: posterior joint space, superior joint space, and anterior joint space. The changes in the angle of the mandibular condyle were also analyzed. If there is a discrepancy between the positional changes of the condyle on the affected side compared to the non-affected side, this may suggest modifications in treatment.


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