Tissue repair after condylectomy in growing Macaca fascicularis

Area of Science:

• Oral and Maxillofacial Surgery
• Regenerative Medicine
• Histology

Background:

• Understanding temporomandibular joint (TMJ) condyle regeneration is crucial for reconstructive surgery.
• Previous studies lack detailed histological analysis of tissue repair post-condylectomy.

Purpose of the Study:

• To investigate the histological nature of tissue repair following condylectomy in growing Macaca fascicularis.
• To compare the regenerative capacity of condylar cartilage and the adaptive changes in the glenoid fossa.

Main Methods:

• Bilateral condylectomies were performed on seven growing Macaca fascicularis.
• Histological examination of 12 resection sites and 12 control condyles after nine months.
• Comparison of tissue repair with and without maxillary and mandibular splints.

Main Results:

• Regenerated hypertrophic cartilage with growth potential was observed in five of 12 resection sites, primarily medially.
• Bone formation predominated in the lateral aspect of resection sites.
• Glenoid fossae showed adaptive changes, contrasting with the control specimens.

Conclusions:

• Organized hypertrophic cartilage can regenerate after condylectomy, but original height is not restored.
• Bone is the predominant tissue in certain areas of the surgical site.
• Glenoid fossa cartilage exhibits adaptive changes similar to condylar cartilage.