Volume 15, Number 3, September 2003

Bone Density of Non-vascularised Iliac Bone Grafts in Mandibular Reconstruction: Long-term Evaluation

Pan Jin,1 Zhang Yi,2 Yu Guang Yan2

1Department of Stomatology, Tongji University, Affiliated East Hospital, Shanghai, and
2Department of Oral Maxillofacial Surgery, Peking University School of Stomatology, Beijing, China

Objective: To examine the healing and remodelling of non-vascularised iliac bone grafts in mandibular reconstruction.
Patients and Methods: Non-vascularised iliac bone grafts in 15 patients were observed longitudinally by means of standardised lateral mandibular radiographs. Digital subtraction bone densitometry was used to detect the changes in bone density.
Results: The bone density of non-vascularised iliac bone grafts decreased from the first to the sixth month postoperatively, then gradually increased and kept increasing for up to 3 years postoperatively. The decrease in bone graft density advanced more rapidly and lasted for a longer period with an increasing distance away from the residual mandibular bone ends, while the subsequent gain in bone density took a longer time and progressed more slowly.
Conclusion: After non-vascularised iliac bone grafting, new bone formation is latent and the bone density is at its lowest level within 6 months postoperatively. After 1 year, new bone formation is active and the bone density increases. This period is more suitable for endosseous implant insertion. Bone near the residual ends of the host mandible is optimal for implants.

Key words: Bone density, Bone grafting, Defects, Mandibular disease

Asian J Oral Maxillofac Surg. 2003;15:162-170.
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