Compound of placenta tissue injection and allogeneic lyophilized bone versus single allogeneic lyophilized bone for reconstruction of jaw bone defects / 中国组织工程研究

ABSTRACT

BACKGROUND: Studies have demonstrated that the freeze-dried and irradiation-sterilized allogeneic bone is an ideal material for bone transplantation, they are present with good biocompatibility and biomechanical property, also maintains some necessary enzymes for bone morphogenetic protein and morphogenesis protein in bone matrix with some osteninductivable potentials. OBJECTIVE: To observe the effect of the compound of placenta tissue injection and allogeneic lyophilized bone on the reconstruction of jaw bone defects of dogs, and to compare with single allogeneic lyophilized bone. DESIGN, TIME AND SETTING: A comparative observational trial was performed in the Animal Experimental Center of Harbin Medical University between December 2007 and September 2008. MATERIALS Eight healthy hybred adult dogs; allogeneic lyophUized bone was offered by Hubei Osteolink Biomatedals Co.,Ltd; placenta tissue injection was purchased from Livzon Pharmaceutical Factory Zhuhai (2 mL per injection); allogeneic lyophilized bone placenta tissue injection=(4-5)1.METHODS: A total of 96 experiment areas from hemisphere jaw defect models at 1.0 cm diameter were established in dog jaw bone site corresponding with central incisor, canine teeth and root apex of the first molar. In the experiment group, the allogeneic lyophilized bone and bone particles were soaked in placenta tissue injection and under saturation state, then the compound of placenta tissue injection and allogeneic lyophilized bone were implanted to jaw bone defect. In the positive control group, the allogeneic lyophilized bone and bone particles were soaked in sodium chloride injection and under saturation state, then implanted to jaw bone defect. In the negative control group, nothing was implanted to jaw bone defect. Each experiment area comprised four materials in each group.MAIN OUTCOME MEASURES: The radiological and histological observations were performed at 2, 4, 8 and 12 weeks after operation.RESULTS: In the experiment group, there was obvious cartilaginous osteogenesis in the earlier period and intramombranous osteogenesis in the late period. The new bone was well integrated with the surrounding tissues. In the positive control group, new recovered bone existed but the combination between the new bone and the original bone was not well. In the negative control group, jaw bone defects were not filled with bone trabecula. Histological examination results showed that there were more new bones in the experiment group than the control groups at 2, 4, 8 and 12 weeks after operation. Statistical difference could be observed among them (P < 0.05, P < 0.01 ).CONCLUSION: The compound of placenta tissue injection and allogenalc lyophilized bone can promote recovery of jaw bone defect actively and shorten recovering time effectively.