Bone autografts & allografts placed simultaneously with dental implants in rabbits

Area of Science:

• Oral Surgery
• Biomaterials Science
• Regenerative Medicine

Background:

• Dental implant stability and osseointegration are crucial for successful restoration.
• Grafting materials, including autografts and allografts, are used to enhance bone regeneration around implants.
• Comparing the efficacy of different graft types is essential for clinical decision-making.

Purpose of the Study:

• To compare the stability, removal torque, bone-to-implant contact (BIC), and bone area (BA) of implants placed with onlay autografts versus allografts.
• To evaluate the osseointegration of implants using autogenous and allogeneic bone grafts in a rabbit tibia model.

Main Methods:

• Eighteen rabbits underwent simultaneous placement of implants with either autografts (Group 1) or allografts (Group 2) in a vertical peri-implant defect model.
• Implant stability was assessed using resonance frequency analysis (ISQ) at T0 and T18 weeks post-surgery.
• Removal torque and histomorphometric analysis (BIC and BA) were performed at 18 weeks.

Main Results:

• Both autografts and allografts demonstrated significant increases in implant stability (ISQ) from T0 to T18.
• No significant differences were found between the autograft and allograft groups in terms of removal torque, BIC, or BA.
• Histomorphometric analysis confirmed comparable bone integration between the two graft types.

Conclusions:

• Autografts and allografts provide similar outcomes regarding implant stability, mechanical retention (removal torque), and bone apposition (BIC and BA).
• Both grafting materials are effective in supporting osseointegration when used with dental implants in this rabbit model.
• These findings suggest that allografts may be a viable alternative to autografts in specific clinical scenarios.