3D lip changes in skeletal Class III patients with premolar extraction: A prospective cohort study comparing surgery-first and orthodontics-first approaches.

ABSTRACT:

Objective

To investigate the three-dimensional (3D) changes in lip morphology introduced by different surgical orthodontic treatment approaches in skeletal Class III patients.

Methods

Forty Class III patients were treated using the surgery-first approach (SFA, n = 20) or a three-stage approach (TSA, n = 20), both involving bimaxillary surgery and maxillary premolar extractions. Cephalograms and facial scans were obtained at different time points (T0-T5) throughout the treatment period. T tests and repeated measures analysis of variance were compared to 3D lip morphology between groups. Correlation analysis and stepwise linear regression were used for prediction.

Results

After debonding, mandibular incisors in the SFA group were positioned more lingually (L1MP: SFA 80.

SUBMITTER: Qi Y 

PROVIDER: S-EPMC12644641 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature