两种氧化锆处理剂对氧化锆陶瓷粘接效果的影响

Influence of two kinds of zirconia primers on the bonding effect of zirconia ceramics

目的评价两种氧化锆处理剂对氧化锆陶瓷粘接强度及耐久性的影响。方法CAD/CAM(computer aided design and computer aided manufacturing)切割制备直径5 mm、厚2 mm的氧化锆圆片(51个),经烧结、喷砂、超声荡洗、烘干后,按氧化锆处理剂种类分为3组:无处理剂组(A组);Z⁃Prime plus组(B组);Clearfil Ce⁃ramic Primer组(C组),每组17个样品。按操作规范涂布处理剂后,以扫描电子显微镜观察氧化锆表面形貌,并制作微剪切粘接试件,分别于水存3 d和冷热循环5000次后测试即刻粘接强度和老化粘接强度,并统计断裂模式。结果扫描电子显微镜观察可见,喷砂处理后氧化锆陶瓷表面呈高低不平的粗糙结构。涂布Z⁃Prime plus后,处理剂未完全覆盖氧化锆表面,呈岛屿状。涂布Clearfil Ceramic Primer后,处理剂完全覆盖于氧化锆陶瓷表面,无氧化锆暴露。能谱分析检测发现,处理剂涂布区域C、O、Si、P元素相对含量较高。涂布处理剂后,A组的即刻粘接强度最低,为(20.6±2.1)MPa,B组即刻粘接强度为(33.2±3.9)MPa,两组间差异有统计学意义(P<0.05),C组即刻粘接强度为(30.7±2.4)MPa,且B组与C组间差异无统计学意义(P>0.05)。在经过5000次冷热循环老化后,A组老化粘接强度最低,为(4.1±2.5)MPa,B组老化粘接强度为(23.1±2.3)MPa,C组老化粘接强度为(28.9±2.6)MPa,3组间差异均具有统计学意义(P<0.05)。A、B组老化粘接强度较即刻粘接强度下降(P<0.05),而C组老化前后粘接强度差异无统计学意义(P>0.05)。经过5000次冷热循环老化,A组断裂模式中粘接破坏百分比由66%提高至100%,B组断裂模式中粘接破坏百分比由16%提高至53%,C组粘接破坏百分比由20%上升至24%。结论涂布处理剂于喷砂后的氧化锆陶瓷表面可增强氧化锆的粘接强度及粘接耐久性。

Objective To evaluate the effect of two commonly used zirconia primers on the bond strength and dura⁃bility of zirconia ceramics.Methods Zirconia wafers with a diameter of 5 mm and a thickness of 2 mm were cut and prepared by CAD/CAM(51).After sintering,sandblasting,ultrasonic cleaning and drying,the zirconia wafers are divid⁃ed into three groups according to the types of zirconia primer:group A,no primer group;group B,Z⁃Prime plus;and group C,Clearfil Ceramic Primer,with each set containing 17 samples.The surface morphology of zirconia was ob⁃served by scanning electron microscopy after applying the coating primer according to the operation specifications.Then,the microshear bonding specimens were made,and the bonding strength was tested after water storage for 3 days and 5000×thermocycling.Results The surface of zirconia ceramics was roughened by sandblasting.After Z⁃Prime plus coating,the primer did not completely cover the zirconia surface,which is island like.After coating with the Clearfil Ceramic Primer,the primer was completely covered on the surface of zirconia ceramics without exposure to zir⁃conia.Energy spectrum analysis showed that the content of C,O,Si and P in the coating area was relatively high.After primer coating,the bonding strength between zirconia and resin cement was significantly higher than that of group A(20.6±2.1)MPa,P<0.05,while there was no significant difference in the immediate bonding strength between group B(33.2±3.9)MPa and group C(30.7±2.4)MPa(P>0.05).After 5000×thermocycling,the bonding strength of group A was(4.1±2.5)MPa,that of group B was(23.1±2.3)MPa and that of group C was(28.9±2.6)MPa.There were statistical⁃ly significant differences among groups A,B and C.The aging adhesive strength of groups A and B was significantly re⁃duced compared with the immediate adhesive strength(P<0.05).Group C had the highest bonding strength after aging(28.9±2.6)MPa,with no significant difference before and after aging(P>0.05).After 5000×thermocycling aging,the percentage of bonding failure in the fracture mode of group A increased from 66%to 100%and that of group B in⁃creased from 16%to 53%.In group C,the percentage of bonding failure increased from 20%to 24%.Conclusion The zirconia primers on the surface of zirconia ceramics after sandblasting can enhance the bonding strength and dura⁃bility of zirconia.