Mandibular reconstruction with a recombinant bone-inducing factor. Functional, histologic, and biomechanical...

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Oral and Maxillofacial Surgery

Background:

• Mandibular defects pose significant reconstruction challenges.
• Bone morphogenetic protein-2 (BMP-2) is a potent osteoinductive factor.
• Evaluating BMP-2 efficacy in large bone defect regeneration is crucial.

Purpose of the Study:

• To assess the efficacy of human recombinant BMP-2 in regenerating critical-sized mandibular defects in dogs.
• To compare bone formation and functional stability in BMP-2 treated defects versus controls.

Main Methods:

• Twenty-six dogs with 3-cm full-thickness mandibular defects were used.
• Defects were treated with BMP-2 loaded carrier (Group 1), carrier alone (Group 2), or no implant (Group 3).
• Evaluations included radiography, histology, histomorphometry, and biomechanical testing at 3 and 6 months.

Main Results:

• Group 1 (BMP-2) demonstrated significant bone formation, allowing plate removal and solid diet by 10 weeks.
• Histomorphometry showed 68% implant replacement by mineralized bone in Group 1 vs. <4% in controls at 6 months.
• Biomechanical testing revealed 27% bending strength in Group 1 vs. 0% in Group 2 at 6 months.

Conclusions:

• Human recombinant BMP-2 effectively induces bone formation and functional restoration in large mandibular defects.
• BMP-2 treatment leads to significant biomechanical strength increase, correlating with mineralization and bone bridging.
• This study supports BMP-2 as a promising therapeutic agent for mandibular reconstruction.