Three-Dimensional Evaluation of Soft Tissue Changes in the Maxillofacial Region after Bimaxillary Rotational Setback Surgery for Skeletal Class III Deformity

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 aim of this study is to evaluate in 3D the changes to the maxillofacial region as a consequence of bimaxillary rotational setback surgery for correction of skeletal Class III deformity, and to correlate these soft tissue changes with the underlying hard tissue alternations between different types of deformity (overbite and open bite). Design: Prospective cohort study. Setting: University hospital Craniofacial Center and Dental Department. Patients and Methods: We plan to recruit 100 patients (age  18 years) with skeletal Class III who underwent bimaxillary rotational setback surgery and are receiving post-surgical orthodontic treatment: overbite (n = 50) and open bite (n = 50). All patients undergo routine 3D orthodontic records (including cone beam CT and 3D facial photograph) before treatment and after treatment. 3D measurements are performed on the combined 3D dataset. Data Analysis: Paired t-test, independent 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:PC10608-2361
External Project ID:MOST106-2314-B182-014