不同表面粗糙度钛合金与牙本质之间粘接强度的比较

目的:观察比较不同表面粗糙度的钛合金与牙本质之间拉伸粘接强度差别.方法:钛合金铸件30个,随机平均分为6组,分别用60,80,100,150,240,320目的碳化硅砂纸打磨粘接面,测定打磨后铸件的表面粗糙度.收集1个月内拔除的人新鲜离体磨牙30颗,在流水冲洗下去除牙合面釉质暴露浅层牙本质,依次用320,400,600目碳化硅水磨砂纸打磨牙本质面.利用Ketac~(TM)Cem Easymix玻璃离子水门汀将打磨后的钛合金铸件和牙本质粘接,经37℃恒温水浴24 h后,用万能试验机检测其微拉伸粘接强度,然后在扫描电镜下观察粘接断面形态.结果:经80目碳化硅砂纸打磨后的钛合金铸件组和牙本质之间的粘接强度最大(6.65 MPa),与其他组相比差别具有显著性意义(P<0.05),该组铸件的表面粗糙度为(2.69±0.32)μm,扫描电镜观察显示,该组粘接断面发生在牙本质与粘结剂之间.结论:表面粗糙度对钛合金与牙本质之间的粘接强度有影响,表面粗糙度为(2.69±0.32)μm的钛合金与牙本质之间的粘接强度最大.

Bond strength between titanium alloy with different surface roughness and dentin

OBJECTIVE: To compare the difference in bond strength between titanium alloy with different surface roughness and dentin. METHODS: Thirty titanium alloy cylindrical specimens were fabricated and randomized to 6 groups. All groups of specimens were rubbed separately with 60, 80,100,150, 240, and 320 grit silicon carbide (Si-C) sand paper. The surface roughness of each group was measured. The occlusal surfaces of 30 human molars freshly extracted within 1 month were flattened to expose an adequate area of lower dentin. The dentin bonding surface was produced using 320, 400, and 600 grit Si-C sand paper, respectively. Titanium alloy and dentin specimens were bonded with Ketac~(TM) Cem Easymix ionomers. All bonded specimens were stored for 24 hours at 37 ℃. The microtensile bond strength was measured through the use of universal testing machine. The fractured surface of titanium alloy was observed under scanning electron microscopy.RESULTS: The titanium alloy group rubbed with 80 grit Si-C sand paper yielded the strongest bond strength, 6.65 MPa, compared with other groups (P < 0.05). The surface roughness of titanium alloy in this group was (2.69±0.32) μm. Scanning electron microscopy results revealed that all fractured surfaces appeared at the interface of dentin and ionomer cement. CONCLUSION: The surface roughness could influence the bond strength between titanium alloy and dentin. Titanium alloy with (2.69±0.32) μm surface roughness bonding to dentin showed the maximum bond strength.