Hard and Soft Tissue Facial Landmarks for Mandibular Angle Reduction: A Clinical Study

Area of Science:

• Medical Imaging
• Anatomy
• Plastic Surgery

Background:

• Square facial morphology is a common concern in Asian populations, often linked to genetic and structural factors.
• Surgical mandibular angle reduction can alter facial aesthetics but carries risks.
• Understanding craniofacial anatomy is crucial for successful aesthetic surgery.

Purpose of the Study:

• To investigate mandibular angle and masseter muscle morphology using computed tomography (CT).
• To analyze hard and soft tissue correlations for optimizing surgical outcomes in patients with square faces.
• To enhance preoperative assessment and surgical planning for mandibular angle reduction.

Main Methods:

• Retrospective clinical study of 100 Taiwanese patients (aged 18-50).
• Computed tomography (CT) analysis of mandibular width, divergence angle, ramus height, and masseter muscle thickness.
• Evaluation of the distance from the mandibular angle to the inferior alveolar nerve (IAN).

Main Results:

• Significant correlations found between patient height/weight, mandibular width, ramus height, masseter thickness, and IAN distance.
• Males showed significantly greater ramus height, masseter thickness, and surgical safety range.
• Most parameters correlated, with exceptions noted between mandibular width/gonial angle and divergence/masseter thickness.

Conclusions:

• Facial squareness results from a complex interplay of anatomical factors.
• Preoperative computed tomography (CT) assessment is vital for understanding individual morphology.
• Customized surgical planning is essential for safe and effective mandibular angle reduction.