三种水门汀对IPS emax CAD陶瓷剪切强度的体外研究

Study of shear bond strength between IPS emax CAD ceramics and three luting cements in vitro

目的:比较口腔临床修复中常用的3种水门汀粘接在IPS emax CAD陶瓷表面的剪切强度。方法:制作IPS emax CAD陶瓷盘状试件60个,厚度3.5 mm,直径8 mm。随机分成3组(n=20),分别采用3种粘接材料(Multinlink N、Rely^(TM)U200、Fuji plus)将各组试件分别粘接在聚乙烯管上,置于Instron万能试验机上进行剪切强度测试,计算其剪切粘接强度,并在体视显微镜下观察试件破坏的断面情况。结果:Multinlink N、RelyTMU200粘接强度较高,分别为12.10±0.25 MPa、11.23±0.47 MPa,两者间差异无统计学意义(P>0.05);Fuji plus粘接强度为3.73±0.46 MPa,与前两者比较差异均有统计学意义(P<0.05)。陶瓷断面显微镜下显示Multinlink N、Rely^(TM)U200水门汀残留物较多,Fuji plus水门汀残留物少。结论:Multinlink N、Rely^(TM)U200水门汀与IPS emax CAD陶瓷粘结时具有较高的剪切强度值,而Fuji plus水门汀剪切强度值较低。

Objective： To compare the shear bond strength （SBS）of three different cements adhesion to IPS emax CAD ceramic surface. Methods：Sixty IPS emax CAD disk specimens were prepared in 8 mm in diameter and 3.5 mm in thickness from disilicate ceramic blocks and divided into 3 groups （n = 20）. The specimens from all groups were bonded with three different cements using polyethylene tubes. The shear bond strength（SBS） was determined using a universal testing machine,and the specimens were also examined with a stereomicroscope. Results： The SBS values were 12. 10 ± 0. 25 MPa, 11.23 ± 0.47 MPa and 3.73 ± 0.46 MPa respectively. It was found that there was no significant differences between Muhinlink N group and RelyTM U200 group （ P 〉 0.05 ）. And the values of these two groups were higher than that of Fuji plus group, which was significantly different from the other two groups （ P 〈 0. 05 ）. Conclusion： Resin cement had the highest shear bond strength values when bonded to lithium disilicate ceramic surface. However resin-reinforced glass ionomer cement demonstrated significantly lower shear bond strength values.