Ridge augmentation using recombinant bone morphogenetic protein-2 techniques: an experimental study in the canine.

Area of Science:

• Oral and Maxillofacial Surgery
• Regenerative Medicine
• Biomaterials Science

Background:

• Recombinant bone morphogenetic protein-2 (rhBMP-2) combined with collagen carriers has limited space-maintaining capacity for bone regeneration.
• Effective bone augmentation is crucial for successful dental implant placement in defects.

Purpose of the Study:

• To evaluate the efficacy of rhBMP-2 combined with different allografts or a mesh for enhancing bone regeneration.
• To assess the suitability of augmented bone for subsequent dental implant placement.

Main Methods:

• Surgically created ridge defects in five dogs were augmented using rhBMP-2/absorbable collagen sponge (ACS) with either a titanium mesh, freeze-dried bone allograft, demineralized freeze-dried bone allograft (DFDBA), or a cancellous allograft block.
• Dental implants were placed eight weeks post-augmentation.
• Histologic and histomorphometric analyses were performed 16 weeks after augmentation.

Main Results:

• Dental implants could be placed in most augmented sites, except for those treated with DFDBA and one block allograft site.
• The block allograft group demonstrated the greatest bone regeneration, with regenerated bone areas ranging up to 35.16 mm².
• The DFDBA group showed the least bone regeneration, with regenerated bone areas up to 33.16 mm².

Conclusions:

• The combination of rhBMP-2 and a block allograft resulted in the most significant ridge width increase.
• This combination represents a promising strategy for bone augmentation in preparation for dental implants.