背景:改变合金构成可以改善镁合金的耐腐蚀性和机械性能.目的:观察钙磷涂层对镁合金植入体周围软组织中骨形成蛋白2表达的影响.方法:将27只兔随机分成3组,分别在兔下颌骨内植入钙磷涂层镁合金螺钉、镁合金螺钉及钛合金,植入后1,2,3个月,采用反转录聚合酶链技术检测植入体周围软组织中骨形成蛋白2 mRNA的表达情况.结果与结论:钙磷涂层镁合金螺钉组、镁合金螺钉组周围软组织中骨形成蛋白2 mRNA的表达,随时间的增加逐渐增高,钙磷涂层镁合金螺钉组内各时间点间骨形成蛋白2 mRNA的表达水平差异有显著性意义(P < 0.05),且镁合金螺钉组植入后1,2个月周围软组织中骨形成蛋白2 mRNA的表达水平高于钙磷涂层镁合金螺钉组(P < 0.05).显示钙磷涂层能够促进骨形成蛋白2 mRNA的表达,并抑制其过度表达,有利于早期成骨过程,表现出良好的生物活性.%BACKGROUND: The alloy composition adjustment can improve the corrosion resistance and mechanical properties ofmagnesium alloys.OBJECTIVE: To investigate bone morphogenetic protein-2 (BMP-2) expression in the soft tissues around calcium phosphatecoating magnesium alloys.METHODS: Twenty-seven healthy adult male Japanese white rabbits were randomly divided into calcium phosphate coatinggroup, untreated group and titanium alloy group. We implanted calcium phosphate coating and untreated AZ31B magnesiumalloy screws into the rabbits' mandible, and titanium alloy group served as the control. The animals were sacrificed after 1, 2 and3 months, and BMP-2 mRNA expressions were measured by reverse transcription-PCR.RESULTS AND CONCLUSION: With time passed, the BMP-2 mRNA expression showed a gradual increase for calciumphosphate coating group and untreated group, and significant differences exited in the calcium phosphate coating group atdifferent time points (P < 0.05). The BMP-2 mRNA expression of the untreated group was significantly higher than that of thecoating group at 1 and 2 months after implantation (P < 0.05). Calcium phosphate coating can promote the mRNA expression ofBMP-2, which is beneficial to the early osteogenesis and shows good biological activity.
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