Department of Dentistry, Federal University of Santa Catarina, Santa Catarina, Brazil.
J Adhes Dent. 2011 Dec;13(6):507-16. doi: 10.3290/j.jad.a19814.
To evaluate the effect on bond strength of 1, 2, or 3 coats of two one-step self-etching adhesives on dentin covered with two different smear layer thicknesses.
Flat dentin surfaces from recently extracted third molars were wet ground with 60- or 600-grit SiC paper to produce smear layers of different thicknesses. Adper Easy Bond (3M ESPE) and Clearfil S3 Bond (Kuraray) were applied in 1, 2, or 3 consecutive coats after air drying each coat. ScotchBond Multi Purpose (3M) and Clearfil SE Bond (Kuraray) were used as controls. Composite resin crowns (Filtek Z250, 3M ESPE) were built up, stored for 24 h, and cut in x and y directions. Eight to twelve sticks (0.65 ± 0.05 mm2 of area) from the central area of each tooth were fractured in tension (0.5 mm/min). Sticks from each group were processed for interfacial micromorphological evaluation with SEM.
Three-way ANOVA revealed a significant interaction between factors (p < 0.05). Tukey's post-hoc test showed that only when Adper Easy Bond was applied on dentin prepared with 600-grit SiC paper, microtensile bond strength was not significantly affected by the number of coatings. However, the effect of smear layer thickness was only statistically significant when the adhesives were applied in one coat, for both adhesives. When they were applied in two or three coats, smear layer thickness did not significantly affect bond strength (p > 0.05).
The thickness of the smear layer affected the bond strength of both all-in-one adhesives. Additional coats can be beneficial to bond strength, especially with Clearfil S3 Bond.
评估两种一步自酸蚀黏结剂在覆盖有两种不同玷污层厚度的牙本质上涂布 1 层、2 层或 3 层对黏结强度的影响。
从最近拔出的第三磨牙上制备平的牙本质表面，用 60 或 600 目 SiC 砂纸湿磨产生不同厚度的玷污层。涂布 1 层、2 层或 3 层后，空气干燥每一层，然后应用 Adper Easy Bond（3M ESPE）和 Clearfil S3 Bond（Kuraray）。 ScotchBond Multi purpose（3M）和 Clearfil SE Bond（Kuraray）作为对照组。复合树脂冠（Filtek Z250，3M ESPE）堆积，储存 24 h 后，沿 x 和 y 方向切割。从每个牙齿的中心区域取出 8 到 12 个（0.65±0.05mm2 面积）棒用于拉伸断裂（0.5mm/min）。用 SEM 对每组棒进行界面微观形貌评估。
三因素方差分析显示各因素之间存在显著的交互作用（p<0.05）。Tukey 事后检验显示，只有当 Adper Easy Bond 应用于用 600 目 SiC 砂纸制备的牙本质时，涂布层数对微拉伸黏结强度没有显著影响。然而，当黏结剂仅涂布 1 层时，只有当黏结剂涂布 1 层时，玷污层厚度对黏结强度有统计学意义。当涂布 2 或 3 层时，玷污层厚度对黏结强度没有显著影响（p>0.05）。
玷污层的厚度影响两种全酸蚀黏结剂的黏结强度。额外的涂层对黏结强度可能有益，尤其是 Clearfil S3 Bond。
