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The BMPs expression and histomorphometric study of β-TCP /rhBMP-2 Grafting on the rabbit cranial bone defects Byung-Sup Lim, Jae-Yoon Jeon, Chang-Joo Park, Jae-Jung Im, Kyung-Gyun Hwang, Kwang-Sup Shim Department of Dentistry/Oral and Maxillofacial Surgery, College of Medicine, Hanyang University, Korea * Corresponding author Kyung-Gyun Hwang, DDS, MSD, PhD. Dept. of Dentistry/OMFS, College of Medicine, Hanyang Univ. E-mail: hkg@hanyang.ac.kr Objective: The Purpose of the study was to investigate the bone morphogenic protein expression of rhBMP-2(recombinant human bone morphogenic protein-2) as singnaling molecule and β-TCP(Tricalcium phosphate) as a bone substitute and carrier medium of rhBMP-2. Materials and Methods: 16 rabbits divided into 2 group of each 8 rabbit. Two standardized bone defect, round bilateral defect was made in the cranium of the 8 rabbit of first group, and was grafted with 150~500μm diameter β-TCP 0.25g in one side, which was soaked with rhBMP-2, and autogenous bone was grafted on another side as a positive control. Second group of 8 rabbit, only β-TCP was grafted with same size and same manner. After 2, 4, 8, and 12 weeks, specimen was taken for microscopic immunohiostochemical and histomorphometric analysis. Result: Grafting β-TCP with rhBMP show the early formation of the bone regenerative factor (BMP-4) and more quantity of new bone formation than only use of β-TCP (8,12 week), even show less new bone formation than autogenous bone. Conclusion : The experimental study result that β-TCP graft combination with rhBMP-2 as a delivery system is an effective with osteoinductive capacity and biodegradable properties, so that provide clinical availibility of composite use in reconstruction of bony defect.

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