Comparative Study of Mandible Ramus Morphology Using 3-dimensional CT in Sagittal Split Ramus Osteotomy

Area of Science:

• Dentistry
• Orthodontics
• Anatomy

Background:

• Sagittal split ramus osteotomy (SSRO) is a common procedure for correcting jaw deformities.
• Understanding mandibular morphology variations is crucial for surgical planning and outcomes.
• Facial skeletal patterns significantly influence maxillofacial anatomy.

Purpose of the Study:

• To investigate the relationship between mandibular ramus external morphology, internal bone structure, and maxillofacial characteristics.
• To analyze these features at the SSRO surgical site across different facial skeletal patterns (Class I, II, and III).

Main Methods:

• Computed tomography (CT) scans of 80 patients undergoing SSRO were analyzed.
• Three-dimensional reconstructions were used to determine mandibular ramus morphology.
• Patients were classified into skeletal Class II, Class III, and a control Class I group.

Main Results:

• Significant differences in mandibular foramen thickness were observed between skeletal Class II and Class III patients.
• Skeletal Class I patients exhibited the lowest bone thickness values at specific points.
• Mandibular morphology demonstrated clear variations correlating with facial skeletal type and cephalometric analysis.

Conclusions:

• Facial skeletal patterns are directly associated with distinct mandibular ramus morphology and bone structure.
• These morphological variations are relevant for planning and executing sagittal split ramus osteotomy.
• Cephalometric analysis and mandibular morphology show a correlative relationship relevant to surgical considerations.