A comparative biomechanical evaluation of mandibular condyle fracture plating techniques

Area of Science:

• Oral and Maxillofacial Surgery
• Biomechanical Engineering
• Orthopedic Surgery

Background:

• Mandibular condylar process fractures are common injuries.
• Rigid internal fixation is a standard treatment approach.
• Evaluating different fixation techniques is crucial for optimal outcomes.

Purpose of the Study:

• To compare the mechanical resistance of three rigid internal fixation techniques for mandibular condylar process fractures.
• To determine the most stable fixation method under simulated physiological loading.

Main Methods:

• Synthetic polyurethane hemi-mandibles were used to test four fixation groups.
• Three techniques involved 2-mm system plates and screws; one served as a control.
• Mechanical testing involved linear loading in medial-lateral and anterior-posterior directions.

Main Results:

• Significant differences in mechanical resistance were observed among fixation groups and loading directions.
• The two-plate fixation system exhibited the best mechanical behavior.
• Fixation was more resistant to anterior-posterior loads; 8-mm screws improved resistance compared to 6-mm screws.

Conclusions:

• The two-plate fixation system offers the most favorable mechanical behavior for mandibular condylar process fractures.
• Longer screws with bicortical engagement can enhance fixation stability.
• This study provides biomechanical evidence supporting specific fixation strategies.