污染对氧化锆陶瓷剪切强度影响的研究

Impact of contamination on shear bonding strength of the zirconia ceramic

目的:研究污染对氧化锆陶瓷剪切强度的影响,以及清除这种污染的方法。方法:40个Al2O3颗粒喷砂处理过的氧化锆陶瓷片,分成5组,每组8个,其中一组不经任何处理为对照组,其余四组经唾液浸泡以及使用硅橡胶指示剂后,分别用75%乙醇冲洗、37%磷酸冲洗、水冲洗和喷砂的清洁方法处理。使用X射线能谱仪对各组陶瓷片进行表面化学分析。使用Fujiplus黏结材料与各组氧化锆陶瓷片黏结,水浴24h后测试其黏结剪切强度。结果:喷砂组的污染被有效清除,磷酸有一定的清除唾液污染的作用,而乙醇和水不能清除陶瓷表面的这两种污染。结论:在氧化锆陶瓷修复体的试戴过程中,污染显著地降低了氧化锆陶瓷与树脂类黏结剂的剪切强度,而进行喷砂处理是最有效的去除污染的方法。

Objective：To study the influence of contamination on the shear bonding strength of zirconia ceramic and the cleaning methods. Methods ： We divided 40 Al2O3 particles of zirconia ceramic specimens treated by sand blasting into 5 groups with 8 ones in each,and one group without any treatment was used as the control group. After saliva immersion and use of silastic agent for all the other 4 groups,the ceramic specimens were, in turn, washed with 75% alcohol, 37% phosphoric acid,water rinsing and sand blasting, respectively. We used the X-ray to make the surface chemistry analysis of zirconia ceramic specimens in each group. Then they were bonded with Fuji plus material,respectively. After preserved in 37C distilled-- water for 24 hours,the shear bonding strength of these specimens was tested. Results：The contamination of airborne--particle was effectively eliminated by using sand blasting group,the phosphoric acid had the part function to eliminate the saliva contamination,alcohol and water failed to remove saliva contamination from ceramic surface. Conclusion ：Contamination significantly reduces shear bonding strength of zirconia ceramic. The sand blasting is the most effective cleaning method.