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- 2017
基质胶缓释神经轴突导向分子SEMA3A对去势大鼠钛种植体稳定性的影响
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Abstract:
摘要 目的:评估基质胶缓释SEMA3A对去势大鼠种植体稳定性的影响。方法:对60只SD大鼠行双侧卵巢切除术。12周后,根据植入种植体的不同将动物随机分为3组:1)对照组,种植体+蒸馏水;2)基质胶组, 种植体+基质胶;3)种植体+基质胶+SEMA3A,将种植体植入所有动物胫骨近端的干骺端。在利用酶联免疫吸附试验检测种植体表面基质胶缓释SEMA3A的生物学过程进行检测。种植体植入后的第4周和第8周将胫骨与植入体一起收集,行显微CT、组织学和生物力学检测。结果:SEMA3A的体外释放检测发现,连续10 d可以检测到基质胶中释放的SEMA3A,其中前3 d呈爆发性释放过程; 种植体植入后第4和第8周,与单独使用基质胶组相比,SEMA3A+基质胶组骨体积百分比分别增加了88.7%和83.3%,骨小梁粗度分别增加了51.4%和49.9%,骨小梁数量分别增加了54.2％和62.1％;在组织学定量评价中,种植体周围相对骨面积分别增加了89.8%和149.2%,骨与种植体结合率分别增加了148.9%和24.8%;生物力学检测发现,种植体的最大推出力增加了149.3%和209.2%,结合刚度增加171.2%和210.6%,结合韧性增加了151.8%和268.2%。结论:用SEMA3A加基质胶对种植体进行表面改性可以有效改善去势大鼠种植体的骨整合与稳定性
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