Treatment-induced errors in occlusion following orthognathic surgery

Area of Science:

• Dental surgery
• Biomechanical analysis
• Orthodontics

Background:

• Post-surgical occlusion often deviates from planned outcomes in orthognathic surgery.
• These occlusal discrepancies can arise from mismatches between the mandibular and articulator centers of rotation.

Purpose of the Study:

• To develop a computer model for quantifying occlusal errors in orthognathic surgery.
• To investigate the relationship between the divergence of rotational centers and the magnitude of occlusal errors.

Main Methods:

• Development of a computer model to simulate and quantify occlusal errors.
• Analysis of the influence of varying discrepancies between patient and articulator centers of rotation.
• Assessment of error magnitude relative to the direction of divergence and changes in vertical dimension.

Main Results:

• The magnitude of occlusal errors increases as the articulator's center of rotation diverges from the patient's mandibular center of rotation.
• Error magnitude increases most rapidly along a specific perpendicular line relative to the rotational centers and mandibular landmarks.
• Small changes in vertical dimension yield clinically insignificant errors, regardless of rotational center mismatch.

Conclusions:

• Mismatches in rotational centers are a significant factor in treatment-induced occlusal errors following orthognathic surgery.
• The developed computer model effectively quantifies these errors, providing insights into surgical planning.
• Understanding these biomechanical principles can help minimize occlusal discrepancies and improve surgical predictability.