Bimaxillary Orthognathic Surgery for Correction of Asymmetric Skeletal Class Iii Deformity: Changes, Outcomes and Prediction

Background and Purposes: Orthognathic surgery for correction of malocclusion is always followed by changes to the covering soft tissues and therefore has an effect on facial aesthetics. The growing importance of aesthetic outcomes from orthognathic surgery has switched the focus to the adaptation of the soft tissue to skeletal changes. The aims of this study are (1) to evaluate in 3D the changes to the maxillofacial region as a consequence of bimaxillary surgery for correction of asymmetric skeletal Class III deformity, and to correlate these soft tissue changes with the underlying hard tissue alternations, (2) to evaluate in 3D the soft and hard tissue outcomes, and to find the predictors.Design: Prospective study.Setting: University hospital Craniofacial Center and Dental Department.Patients and Methods: We plan to recruit 100 patients (age  18 years) with asymmetric skeletal Class III deformity who underwent bimaxillary surgery and are receiving post-surgical orthodontic treatment. All patients undergo routine 3D orthodontic records (including cone beam CT and 3D facial photograph) before treatment, 1 week after surgery, and after treatment. 3D measurements are performed on the combined 3D dataset to evaluate the soft and hard tissue changes and outcomes.Data Analysis: Paired t-test, Pearson correlation and multiple linear regression are used when indicated. Statistical significance is assumed for a p value of less than 0.05.

Project ID:PC10708-0964
External Project ID:MOST107-2314-B182-021