Bone healing after biodegradable mini-plate fixation.

Area of Science:

• Oral and Maxillofacial Surgery
• Biomaterials Science
• Regenerative Medicine

Background:

• Mandibular vertical body osteotomies (MVBO) are surgical procedures requiring stable fixation for bone healing.
• Resorbable fixation systems offer potential advantages over traditional metal implants, such as avoiding a second surgery for removal.
• Evaluating the efficacy of resorbable fixation in critical bone defect healing is essential.

Purpose of the Study:

• To compare bone healing in rabbit mandibular vertical body osteotomies (MVBO) fixed with a 2.0mm resorbable system at one and three months post-surgery.
• To assess the bone regeneration and tissue integration characteristics over time.

Main Methods:

• Twenty rabbit hemimandibles underwent MVBO and fixation with a four-hole, 2.0mm resorbable mini-plate.
• Animals were divided into one-month and three-month follow-up groups.
• Bone healing was evaluated using computed tomography (CT), scanning electron microscopy (SEM), and histomorphometry.

Main Results:

• A statistically significant increase in newly formed bone ratio was observed at three months compared to one month (p<0.05).
• CT and histomorphometric analyses showed greater bone formation at the three-month mark.
• SEM revealed improved adaptation of bone tissue to the resorbable plate and screws by three months.

Conclusions:

• Resorbable mini-plates provide sufficient stability for mandibular osteotomies, allowing immediate function and callus formation.
• The study demonstrates progressive bone healing and favorable tissue integration with resorbable fixation over three months.