Evaluation of canting correction of the maxillary transverse occlusal plane and change of the lip canting in Class III two-jaw orthognathic surgery

摘要

Objective: To compare the effect of canting correction in anterior maxillary transverse occlusal planes (AMTOP) and posterior maxillary transverse occlusal planes (PMTOP) on the change of lip canting (LC) in two-jaw surgery (TJS) cases. Materials and Methods: The samples consisted of eight young adult patients (three males and five females, mean age = 24.1 ± 4.5?years) who had skeletal Class III malocclusion (CIII), facial asymmetry (FA), and LC and who underwent TJS. Two-dimensional lateral and posteroanterior cephalograms and three-dimensional facial scanning taken 1?week before (T1) and 6?months after TJS (T2) were combined using the Morpheus 3D program. Six linear and angular variables were measured and statistically analyzed. Results: When comparing the values of the linear and angular variables at the T1 and T2 stages there was significant canting correction of AMTOP (1.7?mm vs ?0.3?mm; 3.0° vs 0.1°), PMTOP (3.5?mm vs 0.1?mm, 3.3° vs ?0.1°), and LC (3.0?mm vs 0.7?mm, 4.7° vs 2.1°) (all P P r2 = 0.64; P r2 = 0.62 and 0.66; both P Conclusion: In TJS cases with CIII, FA, and LC, the amount of canting correction of the AMTOP should be considered to predict the actual LC change.