Er:YAG激光和酸蚀预处理对自粘结树脂水门汀粘结强度的影响

The effect of Er:YAG laser and/or acid-etching pretreatment on the bond strength of selfadhesive resin cement

目的 :探讨Er:YAG激光和酸蚀预处理对自粘结树脂水门汀粘结强度的影响。方法 :44颗前磨牙根据对牙本质表面预处理方式的不同随机分为4组:对照组、Er:YAG激光组、酸蚀组(35%磷酸)、Er:YAG激光+酸蚀组。每组11颗牙中随机选出1颗切取3 mm厚牙本质片,按相应分组要求预处理后进行扫描电镜观察;每组剩余10颗牙制备一致标准牙本质表面后按相应分组要求预处理,用自粘结树脂水门汀Rely XTMUnicem将其与Everest ZS氧化锆瓷片粘结,24 h后测试各组剪切粘结强度并进行统计分析。结果:扫描电镜观察显示采用不同方式预处理后,牙本质表面形态改变明显;统计分析结果显示剪切粘结强度由高到低为Er:YAG激光组(7.18±2.54)MPa、Er:YAG激光+酸蚀组(5.50±2.09)MPa、对照组(4.05±1.04)MPa、酸蚀组(3.61±0.70)MPa;Er:YAG激光组、Er:YAG激光+酸蚀组与对照组有显著性差异(P<0.05),酸蚀组与对照组无显著性差异(P>0.05)。结论:酸蚀对自粘结树脂粘结强度的改变无明显影响,Er:YAG激光预处理能有效提高自粘结树脂与牙本质和氧化锆瓷的粘结强度。

Objective：To investigate the effect of Er：YAG laser and/or acid-etching pretreatment on the bond strength of self- adhesive resin cement. Methods：Forty-four extracted human premolars were randomly divided into 4 groups according to the different pretreatment on the dentin surface：Control group,Er：YAG laser group,acid-etching group,and Er：YAG laser＋acid-etching group. One tooth selected randomly from each group was cut into 3 mm dentin slices,then observed under Scanning electron microscopy （SEM） after pretreatment. The remaining ten teeth were prepared into the consistent standards dentin surface,then bonded with the self-adhesive resin cement RelyXTM Unicem and Everest ZS zirconia ceramic after pretreatment,tested shear bond strength after 24 h. Results： SEM showed the differences of dentin surface morphology pretreated by different methods. The results of statistical analysis showed that the shear bond strength in the order from high to low is Er：YAG laser group（7.18 ± 2.54MPa）,Er：YAG laser with acid- etching group （5.50 ±2.09MPa）,Control goup （4.05 ± 1.04MPa）,and Acid-etching group（3.61 ± 0.70MPa）;there was a significant difference between Er：YAG laser group,Er：YAG laser with acid-etching group and Control goup（P 〈 0.05）,however,there was no significant difference between Acid-etching group and Control goup （P 〉 0.05）. Conclusion： The study shows that the influence of acid-etching on the shear bond strength of self-adhesive resin is not obvious,while Er：YAG laser pretreatment can obtain better dentin bonding surface, and improve the shear bond strength of the self-adhesive resin with dentin and zirconia ceramic.