Peri-Implant Bone Regeneration Using rhPDGF-BB, BMSCs, and beta-TCP in a Canine Model.

BACKGROUND: The presence of insufficient bone volume remains a major clinical problem for dental implant placement to restore oral function. Tissue engineering provides a promising approach for inducing bone regeneration and enhancing osseointegration in dental implants. PURPOSE: The tissue-engineered bone consisting of recombinant human platelet-derived growth factor (rhPDGF-BB), bone marrow stem cells (BMSCs), and beta-tricalcium phosphate (beta-TCP) particles was validated for the first time in a preclinical large animal canine model in terms of its ability to promote new bone formation around the implants, as well as osseointegration between the tissue-engineered bone and dental implants. MATERIALS AND METHODS: Proliferation and osteogenic differentiation of canine BMSCs treated with rhPDGF-BB were evaluated with an MTT, alkaline phosphatase (ALP) activity, Alizarin Red staining, and real-time quantitative PCR (RT-qPCR) analysis of osteogenic genes. The therapeutic potential of tissue-engineered bone consisting of rhPDGF-BB/BMSCs/beta-TCP in bone repair was evaluated in mesial-implant defects of immediate postextraction implants in the canine mandible. RESULTS: rhPDGF-BB treatment significantly increased proliferation and osteogenic differentiation of canine BMSCs. Furthermore, the tissue-engineered bone consisting of rhPDGF-BB/BMSCs/beta-TCP significantly enhanced bone formation and osseointegration. CONCLUSION: This study provides important evidence that supports the potential application of rhPDGF-BB/BMSCs/beta-TCP tissue-engineered bone in immediate implantation for oral function restoration.