A new method for alveolar bone repair using extracted teeth for the graft material

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Oral and Maxillofacial Surgery

Background:

• Autogenous bone is the gold standard for jawbone grafting but has limitations including donor site morbidity and graft resorption.
• Dental pulp contains stem cells, including undifferentiated neural crest-derived cells, suggesting potential for bone regeneration.
• Investigating alternative bone graft materials is crucial for improving clinical outcomes in jawbone formation.

Purpose of the Study:

• To evaluate the efficacy of tooth-derived materials as a bone graft substitute for jawbone formation.
• To compare the bone regenerative potential of tooth grafts with iliac bone grafts.
• To analyze the cellular and molecular markers associated with tooth graft osteogenesis.

Main Methods:

• Alveolar bone defects were created in Wistar rats and treated with tooth graft, iliac bone graft, or left as controls.
• Real-time polymerase chain reaction (PCR) was used to assess gene expression.
• Microcomputed tomography (micro-CT) and histologic analysis (Hematoxylin and eosin staining) were employed to evaluate new bone formation.

Main Results:

• PCR showed significantly higher expression of P75, P0, nestin, and musashi-1 in teeth compared to other bone grafts.
• At 8 weeks, tooth grafts resulted in comparable new bone formation to iliac bone grafts, as evidenced by micro-CT and histology.
• Osteopontin was expressed in both graft types, while Dentin sialoprotein was specifically noted in the tooth graft's new bone at 6 weeks.

Conclusions:

• Teeth possess stem cells and growth factors that support osteogenesis.
• Tooth-derived materials demonstrate comparable bone regenerative capacity to iliac bone grafts in alveolar defects.
• Teeth represent a promising alternative biomaterial for alveolar bone defect reconstruction, potentially overcoming limitations of autogenous bone grafting.