铸瓷固位钉对牙本质-树脂界面粘结强度的影响

Influence of all ceramic pin on the microtensile bond strength of a resin cement to dentin

目的:探讨自行研制的铸瓷固位钉对牙本质-复合树脂界面粘结强度的影响,为铸瓷固位钉进一步的临床应用提供实验依据。方法:将40颗离体牙随机分为4组:A组,铸瓷固位钉组;B组,金属自攻螺纹钉组;C组,复合树脂钉组;D组,树脂直接充填组。采用IPS e.max Press热压铸瓷系统制作铸瓷牙本质固位钉,制备标准化牙本质-固位钉-复合树脂块试件,微拉伸实验测试各组试件粘结强度,体视显微镜下观察试件断裂面形态。结果:A、B两组试件粘结强度显著高于C、D两组,差异有统计学意义(P<0.05);A组与B组、C组与D组组间粘结强度差异无统计学意义(P>0.05)。A、C、D三组试件断裂模式以牙本质-树脂界面断裂为主,B组以牙本质内聚断裂为主。结论:作为一种新型牙本质固位钉,IPS e.max Press铸瓷固位钉可显著提升牙本质-复合树脂界面的粘结强度。

Objective：To evaluate the effects of self-made all ceramic pin on the micro tensile bond strength of a rensin cement to dentin.Methods：Forty extracted molars were selected and randomly divided into four groups,group A,B and C were prepared with an internal pin channel,then the all ceramic pins,self-threading retentive pins and resin composite pins were inserted into dentin respectively,group D was prepared with no internal retentive features.All subjuects were filled with composite resin.For the microtensile nontrimming technique,10 beam-shaped specimens per group were obtained.Each specimen was loaded in tension until failure and the fracture mode present were observed under stero-microscope.All the results were analyzed statistically.Results：The micro tensile bond strength of group A and B was statistically higher than that of group C and D（P 0.05）,while there were no significant difference between group A and B,or between group C and D（P 0.05）.The breakage modes were observed mainly between the dentin and adhesive interface in group A,C and D,while the dentin cohesive fracture was appeared mainly in group B.Conclusion：IPS e.max Press ceramic pin can significantly enhance micro tensile bond strength of a rensin cement to dentin and is considered as the novel and useful dentin pin.