Distraction osteogenesis in the irradiated rabbit mandible

Area of Science:

• Oral and Maxillofacial Surgery
• Regenerative Medicine
• Biomaterials Science

Background:

• Mandibular reconstruction often faces challenges with irradiated bone.
• Distraction osteogenesis (DO) is a reconstructive technique with limited data in radiated bone.
• Evaluating DO efficacy in previously irradiated bone is crucial for clinical application.

Purpose of the Study:

• To investigate the effects of prior irradiation on mandibular distraction osteogenesis (DO) in a rabbit model.
• To assess the feasibility of DO in a previously irradiated mandibular segment.

Main Methods:

• Rabbits underwent unilateral mandibular irradiation (27.0 Gy).
• Osteotomy and DO were performed 3 months post-irradiation, with distraction at 1 mm/day for 8 days.
• New bone formation was analyzed using radiographic, densitometric, histological, and histomorphometric methods.

Main Results:

• Irradiated bone showed no significant difference in bone mineral density (BMD) compared to controls.
• The percentage of new bone area was similar between irradiated and control groups.
• Histology revealed less organized new bone and more chondroid islands in the irradiated group.

Conclusions:

• Distraction osteogenesis appears feasible in previously irradiated rabbit mandibles.
• While bone quality may be affected, DO can still achieve new bone formation.
• Further research is warranted to optimize DO in compromised bone.