Cairo University, Operative Dentistry Department, Cairo, Egypt.
Oper Dent. 2009 Nov-Dec;34(6):688-96. doi: 10.2341/08-089-L.
The current study was carried out to evaluate the effect of doubling the adhesive layers of three acetone-based adhesives on the microtensile bond strength and ultra morphological characterization of the resin dentin interface using SEM.
A total of 27 caries-free human molars were used. Superficial flat dentin surfaces were obtained by wet grinding the buccal surfaces. Three adhesive systems Prime & Bond NT (G1), XENO IV (GII) and G BOND (GIII) were used according to three different protocols: (A) according to the manufacturer's instructions, (B) doubling the adhesive layers and light curing and (C): doubling the adhesive layers with intermediate curing between each layer. Resin composite buildups were made using TPH Spectrum resin composite on the bonded surfaces in 1 mm light cured increments for 40 seconds each. The bonded teeth were sectioned to obtain sticks for microtensile testing. The testing was conducted using a universal testing machine at a crosshead speed of 1 mm/minute. The microtensile bond strength means and standard deviations were calculated and the data were statistically analyzed using Two-way Analysis of Variance (ANOVA) and Tukey's post-hoc tests (p < or = 0.05). Ultra morphological characterization of the resin-dentin interface and representative fractured dentin specimens were examined using SEM.
When applied according to the manufacturer's instructions, Prime & Bond NT (total etch adhesive) showed significantly high microtensile bond strength with a mean value +/- SD of 35 +/- 12.7 MPa followed by XENO IV (21.2 +/- 9.4 MPa), while G BOND presented a significantly lower mean value (10.9 +/- 2.9 MPa). Doubling the adhesive layers significantly reduced the mean strength of the total etch adhesive system; in contrast, it significantly increased the bond strength of both self-etch adhesives. The relatively thicker adhesive layer was seen with the total-etch adhesive when the application was doubled, while the hybrid layer appeared thicker with self-etch adhesives.
Doubling the adhesive layer applications significantly improved the bond strength of the two self-etch adhesives (XENO IV and G BOND); however, it had a negative effect on the bond strength of the total-etch adhesive (Prime & Bond NT).
本研究旨在评估三种丙酮基胶粘剂的粘结层加倍对树脂牙本质界面微拉伸粘结强度和超微形态特征的影响，采用扫描电镜（SEM）进行评估。
共使用 27 颗无龋人磨牙。通过湿磨颊面获得浅平牙本质表面。根据三种不同的方案使用三种粘接系统 Prime&Bond NT（G1）、XENO IV（GII）和 G BOND（GIII）：（A）根据制造商的说明，（B）加倍粘结层并进行光固化，（C）：在每层之间进行中间固化，然后再进行双层粘结层。在粘结表面上使用 TPH Spectrum 树脂复合材料，每 1mm 光固化增量进行 40 秒的树脂复合材料构建。将粘结的牙齿切割成用于微拉伸测试的棒。在万能试验机上以 1mm/min 的十字头速度进行测试。计算微拉伸粘结强度平均值和标准偏差，并使用双向方差分析（ANOVA）和 Tukey 事后检验（p≤0.05）对数据进行统计分析。使用 SEM 对树脂-牙本质界面的超微形态特征和代表性断裂牙本质标本进行检查。
按照制造商的说明应用时，Prime&Bond NT（全酸蚀粘结剂）显示出显著较高的微拉伸粘结强度，平均值+/-标准差为 35+/-12.7MPa，其次是 XENO IV（21.2+/-9.4MPa），而 G BOND 则显示出显著较低的平均值（10.9+/-2.9MPa）。加倍粘结层显著降低了全酸蚀粘结剂系统的平均强度；相比之下，它显著增加了两种自酸蚀粘结剂的粘结强度。当应用加倍时，全酸蚀粘结剂中可以看到相对较厚的粘结层，而自酸蚀粘结剂中则可以看到更厚的混合层。
加倍粘结层应用显著提高了两种自酸蚀粘结剂（XENO IV 和 G BOND）的粘结强度；然而，它对全酸蚀粘结剂（Prime&Bond NT）的粘结强度产生了负面影响。
