Biologic basis for interpositional autogenous bone grafts to the mandible

Area of Science:

• Oral surgery
• Regenerative medicine
• Bone grafting

Background:

• Autogenous bone grafting is a common procedure in oral and maxillofacial surgery.
• Assessing graft viability and host integration is crucial for successful outcomes.
• Understanding the remodeling process of bone grafts and repositioned segments is essential.

Purpose of the Study:

• To evaluate cell survival within interpositional autogenous bone grafts.
• To assess the viability of superiorly repositioned alveolar segments.
• To monitor the bone remodeling process following grafting in canine mandibles.

Main Methods:

• Interpositional autogenous bone grafting was performed in the mandibles of 12 beagle dogs.
• Histologic and radiologic analyses were used to assess cell survival and bone remodeling.
• The viability of the superiorly repositioned alveolus was specifically examined.

Main Results:

• Bone grafts were well-accepted with rapid new bone formation on graft trabeculae.
• Osteocytes within the autografts generally did not survive.
• The superiorly repositioned alveolus showed no necrosis or resorption and united rapidly with the graft and mandible.

Conclusions:

• The lingual pedicle of soft tissue adequately maintains the viability of the repositioned alveolus.
• Autogenous bone grafts undergo rapid remodeling and integration, despite poor osteocyte survival.
• This technique provides a stable structure for mandibular reconstruction.