三种树脂粘接剂对可切削复合树脂与牙本质粘接强度的比较研究

目的 通过比较3种树脂粘接剂对聚甲基丙烯酸甲酯-纳米二氧化硅-二氧化锆(polymethylmecrylate/nano SiO2-ZrO2,PNSZ)可切削复合树脂与牙本质的粘接强度的差异,寻找适合PNSZ可切削复合树脂的树脂粘接剂,为临床应用提供参考.方法 使用树脂粘接剂A(RelyX ARC)、B(Panavia-F)和c(Variolink II)粘接PNSZ可切削复合树脂与牙本质,测试剪切粘接强度和微拉伸粘接强度(各分为A、B、C 3组,每组10个试件),并采用50倍立体显微镜观察断裂模式.结果 剪切测试中A、B、C组试件的粘接强度分别为(14.07±4.67)、(13.17±4.63)、(12.10±2.18)MPa,差异无统计学意义(P＞0.05);微拉伸测试中A、B、C组试件的粘接强度分别为(11.49±4.90)、(9.66±4.15)、(10.11±4.20)MPa,差异无统计学意义(P＞0.05).立体显微镜观察显示,3种粘接剂的断裂模式均以牙本质-粘接剂界面的断裂为主.结论 3种树脂粘接剂对PNSZ可切削复合树脂与牙本质的粘接效果相近.PNSZ可切削复合树脂一粘接剂界面的粘接优于牙本质-粘接剂界面.

Experimental study on bond strength of machinable composite resin and dentin with three kinds of resin cements

Objective To examine the shear and microtensile bond strength between a newly developed dental machinable composite resin(pelymethylmecrylate/nano SiO2-ZrO2,PNSZ)and dentin cemented using three resin luting systems and to select the most suitable one.nethods The shear and microtensile bond strength between the machinable composite resin and dentin cemented using three resin luting systems(Group A:RelyX ARC,Group B:Panavia-F,Group C:Variolink II)were tested.The broken specimens were observed with a stereomicroscope(×50)to compare their failure modes. Results In the shear tests,no significant difierence was found in bond strength among Group A[(14.07±4.67)MPa],Group B[(13.17±4.63)MPa]and Group C[(12.10±2.18)MPa](P＞0.05).In the microtensile tests,no significant difference was found in bond strength among Group A[(11.49±4.90)MPa],GroupB[(9.66±4.15)MPa].and Group C[(10.11±4.20)MPa](P＞0.05).The failure modes of all the three resin cements were predominantly adhesive failures at the dentin/cement interface.Conclusions The three typos of resin cements showed similar results in bend strength between the dental machinable composite resin and dentin.Bonding at the resin/cement interface was stronger than that at the dentin/cement interface.