Analysis of vertical loading forces on three different sagittal split ramus osteotomy modifications.

Area of Science:

• Oral and Maxillofacial Surgery
• Biomechanical Engineering
• Dental Implantology

Background:

• Sagittal split osteotomy is a common procedure in orthognathic surgery.
• Different osteotomy designs aim to improve mandibular stability and reduce complications.
• Understanding the biomechanical behavior of these designs is crucial for clinical success.

Purpose of the Study:

• To compare the in vitro mechanical behavior of three sagittal split osteotomy designs under vertical load.
• To analyze the impact of Epker, Wolford, and Wyatt designs on mandibular stability.
• To identify design modifications that enhance biomechanical performance.

Main Methods:

• Utilized synthetic polyurethane hemi-mandibular models replicating Epker, Wolford, and Wyatt osteotomy designs.
• Applied linear vertical loading to each model until failure, recording peak load and deformation.
• Employed Analysis of Variance (ANOVA) and Tukey tests for statistical comparison of mechanical responses.

Main Results:

• No significant difference in load resistance between Epker (Group 1) and Wolford (Group 2) designs.
• Wyatt (Group 3) design exhibited increased mandibular fragility, especially with fixation in thinner bone areas.
• Osteotomy design modifications significantly altered mechanical behavior, emphasizing bone thickness and technique's role.

Conclusions:

• Sagittal split osteotomy design choice critically influences mechanical behavior under vertical load.
• Bone thickness at fixation points and surgical technique are paramount for early postoperative stability.
• Epker and Wolford designs (Groups 1 and 2) are preferred for enhanced mandibular stability and fewer complications.