目的

研究新型黏结剂的边缘封闭性。

方法

在新鲜拔除的30 个磨牙 面制备 面洞，随机分为3 组，分别应用单组份自酸蚀黏结剂、双组份自酸蚀黏结剂和全酸蚀黏结剂三类进行黏结，3M Z250 树脂充填。经温度循环后，亚甲蓝溶液染色，对牙齿长轴切片，在体视显微镜下观察修复体边缘染料渗漏情况。

结果

三类黏结剂微渗漏实验结果间差异具有统计学意义（P ＜0.05），单组份自酸蚀组微渗漏最小，全酸蚀组次之，双组份自酸蚀组微渗漏发生最为严重。

结论

新一代单组份自酸蚀黏结剂具有更好的黏结效果和边缘封闭性。

Objective

To study the sealing ability of novel bonding agents.

Methods

Type Ⅰcavities were prepared on occlusal surface of 30 freshly extracted molars.Teeth were randomly divided into 3 groups.Cavities were restored with 3M Z250， bonding by the following 3 type of adhesive system： one-component self-etch system， two-component self-etch system and total-etch system respectively.After thermal cycling， all teeth were immersed in methylene blue solution and then sectioned longitudinally.The cavity walls were examined by stereomicroscope to investigate the microleakage of the resin.

Results

There were significant differences in the results of the three groups （P ＜0.05）.The one-component self-etch system showed the lowest incident of microleakage while the two-component self-etch system showed the highest incident of microleakage.

Conclusion

The new generation of one-component self-etch adhesive demonstrates a better effect of adhesion and marginal integrity.