Effect of different bur grinding on the bond strength of self-etching adhesives
Effect of different bur grinding on the bond strength of self-etching adhesives
复制标题
DOI：
10.2341/04-171
复制
发表时间：
2006-05-01
影响因子：
2.2
通讯作者：
Sano, H.
中科院分区：
文献类型：
--
作者：
Semeraro, S.;Mezzanzanica, D.;Sano, H.
本研究比较了三种一体式粘接系统和一种两步法粘接系统的微拉伸粘结强度(MTB)，该系统使用两种类型的毛刺来制备牙本质表面。24颗拔除的人磨牙的平冠表面分别用普通磨粒和超细磨粒的金刚石钻进行了加工。然后使用四种粘结剂中的一种将树脂复合材料粘接到相同数量的表面：Clearfi SE Bond(CSE)、G-Bond(GB)、SSB-200(SSB)或Prompt L-Pop(PLP)。在37℃蒸馏水中保存24小时后，将粘结的牙齿切成垂直于粘结表面的切片(0.7 mm厚)。然后对试件进行微拉伸测试，并计算破坏时的粘结强度。粘结强度数据用双因素方差分析和Games-Howell检验分析粘结剂与牙本质切割类型的相互作用。用扫描电子显微镜观察断口，确定失效模式。此外，为了观察修复体的效果，对另外8颗牙的两个等数量的毛刺切割牙本质表面进行粘结剂处理，并用扫描电子显微镜观察。结果表明，当CSE和SSB粘结到常规磨粒金刚石钻切面的牙本质切割面时，MTBS值显著低于超细磨削牙本质切割面，而GB和PLP在两种不同切割面之间的MTBS值无显著差异。断口的扫描电子显微镜观察显示，除PLP外，所有试件都出现了混合失效模式(部分区域粘结，同一试件中其他区域粘结)，这表明两种类型的毛刺制备的粘结剂内部粘结失效。结果表明，在切割牙本质时，选择合适的钻头类型对于提高自酸蚀粘接系统的粘接强度是非常重要的。
This study compared the microtensile bond strength (MTBS) of three all-in-one adhesive systems and a two-step system using two types of burs to prepare the dentin surfaces. Flat coronal surfaces of 24 extracted human molars were produced using either regular-grit or superfine-grit diamond burs. Resin composite was then bonded to equal numbers of these surfaces using one of the four adhesives: Clearfil SE Bond (CSE), G-Bond (GB), SSB-200 (SSB) or Prompt L-Pop (PLP). After storage for 24 hours in 37 C distilled water, the bonded teeth were sectioned into slices (0.7-mm thick) perpendicular to the bonded surface. The specimens were then subjected to microtensile testing and the bond strengths were calculated at failure. Bond strength data were analyzed by two-way ANOVA and the Games-Howell test for interaction between adhesive and type of cut dentin. The fractured surfaces were observed by SEM to determine the failure mode. In addition, to observe the effect of conditioning, equal numbers of the two bur-cut dentin surfaces of eight additional teeth were conditioned with the adhesives and observed by SEM. Based on the results, when CSE and SSB were bonded to dentin cut with a regular-grit diamond bur, the MTBS values were significantly lower than that of superfine bur-cut dentin; whereas, GB and PLP showed no significant differences in MTBS between the two differently cut surfaces. SEM observation of the fractured surfaces revealed a mixed mode (adhesive in some areas and cohesive in others in the same sample) of failure in all specimens except PLP, which showed cohesive failure within the adhesive for both types of bur preparation. Generally, SEMs of the conditioned surfaces using both types of burs showed partial removal of the smear layer for CSE, minimal for GB and SSB and complete removal for PLP.In conclusion, when cutting dentin, selecting the proper bur type is important for improving the bond strength of some self-etching adhesive systems.