Effect of dentin conditioners on the microtensile bond strength of laser-irradiated dentin.

doi:10.7504/kq.2014.05.008

Abstract

Abstract:

Abstract：Objective To evaluate the effect of dentin treatments on the microtensile bond strength and morphology of Er，Cr∶YSGG laser-irradiated dentin. Methods Eight freshly extracted human premolars and twenty third molars were used. Occlusal flat dentin surface was processed with Er，Cr∶YSGG laser.The premolars and the third molars were randomly assigned to four groups respectively according to the following conditioners：no treatment（G1），37% phosphoric acid（G2），self-etch adhesive（G3）or 0.5 mol/L EDTA（G4）. We evaluated the morphology of conditioned surfaces in premolars with scanning electron microscopy（SEM）. Conditioned surfaces of the third molars were then bonded with either Adper easy bond or Adper Single Bond 2 followed by resin composite（Z350）build-ups constructed incrementally. Then they were cut into dumbbell-shaped specimens for the microtensile bond strength test. Data were analyzed by one-way ANOVA. Results SEM showed that laser-irradiated dentin left no smear layer and the dentinal tubules were open and irregular. The surfaces with phosphoric acid were most regular，and there were less change with self-etch adhesive or EDTA. All surface treatment statistically increased the mean microtensile bond strength values（P＜0.05）.However，phosphoric acid treatment significantly demonstrated the highest bond strength values（P＜0.05）and there were statistically similar microtensile bond strength between G3 and G4（P＞0.05）. Conclusion The three dentin treatments improve the microtensile bond strength of Er，Cr∶YSGG laser-irradiated dentin，and 37% phosphoric acid treatment has best short-term effect in bonding to laser-irradiated dentin.

Key words: laser, dentin conditioners, microtensile bond strength

摘要：

目的评价不同表面处理方法对激光预备牙本质形态学变化和黏结强度的影响。方法 2013年5月至7月在中国医科大学附属口腔医院收集20 ~ 40岁新鲜拔除的活髓第三磨牙20颗及根尖发育完全的前磨牙8颗，铒、铬∶钇钪镓石榴石（Er，Cr∶YSGG）激光处理暴露的牙合面牙本质，然后按照不处理、37%磷酸酸蚀、自酸蚀及0.5 mol/L EDTA调节各自分为4组，使用扫描电子显微镜（SEM）观察前磨牙牙本质处理面形态；第三磨牙使用Adper easy bond或 Single bond 2黏结，Z350树脂逐层堆积树脂冠后，制作哑铃型试件进行微拉伸黏结强度测试，采用单因素方差分析进行组间差异比较。结果 SEM观察发现：前磨牙激光预备后不处理组（对照组）牙面不规则，无玷污层，牙本质小管开放；磷酸酸蚀组牙本质表面最规则，自酸蚀组和EDTA处理组处理后表面变化不如磷酸酸蚀组明显。微拉伸黏结强度测试结果显示，第三磨牙分组后的3种处理方式牙本质黏结强度均显著高于对照组（P＜0.05），磷酸酸蚀组黏结强度最强（P＜0.05），而自酸蚀组及EDTA处理组差异无统计学意义（P＞0.05）。结论 37%磷酸酸蚀、自酸蚀及0.5 mol/L EDTA调节3种处理均可提高激光预备的牙本质黏结强度，37%磷酸酸蚀组获得最佳短期黏结效果。

关键词: 激光, 牙本质表面处理, 微拉伸黏结强度

CLC Number:

Ｒ78

LI Yang，JIA Xing-ya，DU Jian-nan. Effect of dentin conditioners on the microtensile bond strength of laser-irradiated dentin.[J]. Acta Metallurgica Sinica, DOI: 10.7504/kq.2014.05.008.

李阳，贾兴亚，杜健男. 表面处理方法对激光预备牙本质黏结强度的影响[J]. 中国实用口腔科杂志, DOI: 10.7504/kq.2014.05.008.

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