Reis André Figueiredo, Oliveira Marcelo Tavares, Giannini Marcelo, De Goes Mário Fernando, Rueggeberg Frederick A
Department of Restorative Dentistry, Piracicaba School of Dentistry, UNICAMP, Piracicaba, SP, Brazil.
Oper Dent. 2003 Nov-Dec;28(6):700-6.
This study evaluated the microtensile bond strength (pTBS) of ethanol/water- and acetone-based, one-bottle adhesive systems to enamel (E) and dentin (D) in the presence (P) or absence (A) of their respective solvents. Thirty-two freshly extracted third molars were flattened with 600-grit SiC paper and restored with Single Bond (SB) or Prime&Bond 2.1 (PB) according to the manufacturers' instructions and after full solvent elimination. The molars were divided into eight test groups (n = 4): G1-SB-E-P, G2-SB-E-A, G3-PBE-P, G4-PB-E-A, G5-SB-D-P, G6-SB-D-A, G7-PB-D-P and G8-PB-D-A. After applying the adhesive resins, composite crowns of approximately 8 mm were built up with TPH Spectrum composite. After 24-hour water storage, the specimens were serially sectioned bucco-lingually to obtain 0.8 mm slabs that were trimmed to an hourglass shape, approximately 0.8 mm2 at the bonded interface. The specimens were tested in tension using a universal testing machine (0.5 mm/minute). The results were statistically analyzed by ANOVA and Tukey test. The frequency of fracture mode was compared using the Kruskal-Wallis test. There were no statistically significant differences in mean bond strength among the groups restored with or without solvent for enamel. However, the results were significantly different for the dentin groups (MPa): G5-26.2 +/- 8.6a; G7-23.6 +/- 11.3ab; G6-12.8 +/- 2.1bc; G8-6.2 +/- 3.1c. SEM examination indicated that the dentin group failure modes were significantly different from the enamel groups. The results suggest that the presence of organic solvents does not influence microTBS to enamel. However, microTBS to dentin was significantly affected by the absence of solvents in the adhesive system.
本研究评估了基于乙醇/水和丙酮的单瓶装粘结系统在有或无各自溶剂存在的情况下与牙釉质（E）和牙本质（D）的微拉伸粘结强度（pTBS）。三十二颗新鲜拔除的第三磨牙用600目碳化硅砂纸磨平，并根据制造商的说明在完全去除溶剂后用单键（SB）或全优粘结2.1（PB）进行修复。磨牙被分为八个测试组（n = 4）：G1 - SB - E - P、G2 - SB - E - A、G3 - PB - E - P、G4 - PB - E - A、G5 - SB - D - P、G6 - SB - D - A、G7 - PB - D - P和G8 - PB - D - A。在应用粘结树脂后，用TPH光谱复合树脂构建约8毫米的复合冠。在储存24小时水后，将标本沿颊舌向连续切片以获得0.8毫米的薄片，这些薄片被修剪成沙漏形状，在粘结界面处约为0.8平方毫米。使用万能试验机（0.5毫米/分钟）对标本进行拉伸测试。结果通过方差分析和Tukey检验进行统计学分析。使用Kruskal - Wallis检验比较断裂模式的频率。对于有或无溶剂修复的牙釉质组，平均粘结强度之间没有统计学上的显著差异。然而，牙本质组的结果有显著差异（MPa）：G5 - 26.2±8.6a；G7 - 23.6±11.3ab；G6 - 12.8±2.1bc；G8 - 6.2±3.1c。扫描电子显微镜检查表明牙本质组的失败模式与牙釉质组有显著差异。结果表明有机溶剂的存在不会影响对牙釉质的微TBS。然而，粘结系统中无溶剂会显著影响对牙本质的微TBS。
