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- 2016
“脑回形(cortex-like)”微弧氧化膜钛种植体成骨的Micro-CT分析
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Abstract:
摘要 目的: 利用Micro-CT评价“大脑皮质”(cortex-like)形貌的二氧化钛膜层在初始稳定性和继发稳定性阶段的骨-种植体结合的能力。方法: 实验组MAO(cortex-like)为 “大脑皮质”形貌种植体,对照组SLA为具有同等规格的SLA形貌的种植体,共计36颗,通过扫描电镜(SEM)等对材料表面进行表征,随机植入18只新西兰雄性兔的股骨髁部,分别于4周和8周处死取样,所得标本行Micro-CT扫描重建,分析MAO和SLA种植体表面的骨结合状况以及的骨小梁形态学参数。结果: 类“大脑皮质”形貌氧化层由微米级沟槽和纳米级孔洞组成,沟槽相互交通,接触角(6.9±1.14)°,Micro-CT检测可见:随着骨结合时间的延长,骨体积分数(BV/TV)、骨小梁数量(Tb.N)、厚度(Tb.Th)、连接密度增加(Conn.Dn)均增加,结构模型指数(SMI)、骨小梁分离度(Tb.Sp)下降,第4周时,BV/TV,SMI组间比较差异存在统计学意义(P<0.05),第8周时,BV/TV、Tb.N、Tb.Sp、Conn.Dn值组间比较差异存在统计学意义(P<0.05),MAO高于SLA组。结论: “大脑皮质”(cortex-like)形貌的二氧化钛、具有双微层结构膜层,能促进种植体的骨结合的提升,是一种良好的种植体改性方法
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