用酸蚀法提高纯钛与光固化冠桥树脂粘结强度的研究

目的：研究用酸蚀法提高钛与光固化复合树脂剪切粘结强度的可行性，并观察表面粗糙度与剪切粘结强度之间的关系。方法：采用不同浓度的酸蚀剂对钛铸件表面进行酸蚀，并与artglass光固化复合树脂进行粘结，以单纯喷砂组为对照，比较剪切粘结强度的差异。对酸蚀后及剪切试验后的金属表面进行扫描电镜观察，并测定其表面粗糙度。结果：用酸蚀法可以显著提高钛与复合树脂的粘结强度，HF浓度为4％时粘结强度最高。表面粗糙度随酸蚀剂的浓度增高而下降。结论：纯钛铸件用酸蚀法处理后可以获得较高的粘结强度，HF酸浓度以4％为宜。表面粗糙度对粘结强度不起决定性作用。

Study of chemical etching on increasing bond strength of light-cured composite to pure titanium

Objective: To investigate the possibility of increasing bond strength between pure titanium and polymer-glass composite using chemical etching method, and to investigate the relation between surface roughness and bond strength.Methods:The forty cast-titanium discs were divided into five groups, the control group was treated with sandblasting, the other four groups were etched with 1.5%,2.7%,4.0%,5.5%HF etching agent. After surface treatment, the Artglass (polymer-glass) composites were applied to the surface of titanium discs and then light-polymerized. Shear bond strength was determined 24h later. SEM was used to observe the surface morphology of titanium discs before and after etching and surface roughness was also tested.Results:It showed that chemical etching can increase bond strength of polymer-glass composite to pure titanium remarkably, the greatest bond strength was gained in 4.0%HF group. Conclusion: It demonstrated that etching with 4.0%HF can effectively increase bond strength of polymer-glass composite to pure titanium. The surface roughness of titanium discs didn't show decisive influence on bond strength.