A Single-Stage Surgery of Mandibular Angle Ostectomy and Corticectomy Combined with Masseter Muscle Resection for Facial Contouring in the Vietnamese Population.

[INTRODUCTION] In Asia, a square face, which is characterized by prominent mandibular angles or masseter hypertrophy, is considered less aesthetic and masculine by Oriental populations, including Vietnamese. A combination of any two procedures of mandibular ostectomy, outer cortex grinding or ostectomy, and masseter muscle resection was widely presented. In this article, we presented a single-stage procedure combining angle-body-chin curved ostectomy, corticectomy, and/or masseter muscle resection based on four classifications of mandibular angles, which brought satisfactory results in the Vietnamese population.

[METHODS] From January 2021 to February 2023, all cases (n = 31) that underwent facial contouring surgery only for aesthetic purposes in our clinic were included in the study. The majority of patients underwent a combination of curved ostectomy, corticectomy, and masseter muscle resection to achieve optimal results. Pre- and postoperative mandibular angles (ArGoMe), the distance between two bilateral angles (G-G), and the distance between soft tissue parts of two bilateral angles (G'-G') measured by cephalometry were recorded.

[RESULTS] The ArGoMe angle significantly increased from 114.3° ± 3.1 to 128.7° ± 5.0 (p < 0.0001). The G-G distance and G'-G' distance statistically decreased from 97.6 ± 6.6 to 86.2 ± 4.0 mm (p < 0.0001) and from 120.7 ± 7.2 to 111.0 ± 7.2 mm (p < 0.0001). 94% of patients expressed their satisfaction with the results. No severe complications were noted.

[CONCLUSIONS] The combination of curved mandibular ostectomy-corticectomy-masseter resection brought satisfactory results to patients with a square face and idiopathic masseter hypertrophy in both frontal and lateral views. This approach was suitable for patients with a prominent mandibular angle and masseter hypertrophy, which might be widely present in the Vietnamese population and other populations with similar anatomic characteristics.

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