Aesthetic Enhancement of the Gonial Angle and Inferior Mandibular Border in the Chinese Population

The current absence of a standardized mandibular body osteotomy design poses challenges in surgical planning. Traditional approaches may not suit patients with wider anterior mandibles, potentially resulting in unsatisfactory outcomes. Addressing this issue requires a rational design that combines mandibular angle and body osteotomies for improved clinical practice.This retrospective cohort study aimed to analyze mandibular computed tomography (CT) data using digital methods. The goal was to establish an integrated osteotomy design for both mandibular angle and body procedures and classify prevalent mandibular types in the Chinese Han population for surgical guidance.Included were 89 patients who underwent mandibular angle osteotomy without genioplasty between 2016 and 2022 at Peking University Third Hospital. Mimics 21.0 software (Materialise; Leuven, Belgium) facilitated CT data reconstruction and osteotomy planning. Postoperative effects were assessed through imaging, complications, and surveys, leading to mandibular type classification.Mandibular angles were categorized into three types based on osteotomy range. Type I involved mandibular body osteotomy only, Type II mandibular angle osteotomy only, and Type III both mandibular angle and body osteotomies. Distribution within the cohort was 2.25%, 8.99%, and 88.76% for Types I, II, and III respectively. Patient satisfaction was high, with minor and major complications at 47.19% and 1.12% using Clavien-Dindo classification.Utilizing Mimics software, this study established an integrated osteotomy design and categorized mandibular types. Findings offer valuable guidance for mandibular angle surgery and contribute to Asian mandibular morphology understanding.