Relationship Between Masticatory Muscle Size and Bone Regeneration After Mandibular Angle Osteotomy

Area of Science:

• Oral and Maxillofacial Surgery
• Plastic Surgery
• Regenerative Medicine

Background:

• Mandibular angle osteotomy with outer cortex grinding is a common cosmetic procedure.
• Postoperative bone hyperplasia at the mandibular angle can negatively impact surgical outcomes.

Purpose of the Study:

• To evaluate the influence of masticatory muscles on bone repair after mandibular angle osteotomy.
• To analyze the correlation between masticatory muscle morphology and bone volume changes in the mandibular angle.

Main Methods:

• Retrospective review of patients undergoing mandibular angle osteotomy with outer cortex grinding (January 2016 - January 2019).
• Analysis of computed tomography (CT) data to measure mandibular angle bone volume changes.
• Correlation analysis between masticatory muscle thickness/cross-sectional area and bone regeneration.

Main Results:

• Significant bone hyperplasia was observed in the mandibular angle area during long-term follow-up compared to immediate postoperative bone volume (P < 0.01).
• The thickness and cross-sectional area of the masseter muscle showed a significant relationship with bone regeneration (P < 0.01).

Conclusions:

• While mandibular angle osteotomy effectively addresses prominent mandibular angles, surgeons must consider muscle-related bone hyperplasia.
• Masticatory muscle morphology is a significant factor in post-osteotomy bone regeneration, potentially compromising aesthetic results.