Operative Dentistry, Pontifical Catholic University of Rio Grande do Sul, Rio Grande do Sul, Brazil.
Oper Dent. 2010 Jan-Feb;35(1):69-76. doi: 10.2341/09-061-L.
This research evaluated the influence of the number of adhesive layers of three adhesive systems on microtensile bond strength (microTBS) to dentin and the internal adaptation between the dental structure and the resin composite restoration. Two cavities (C-factor = 3) were made on the buccal surfaces of 30 bovine incisors. Scotchbond Multi-Purpose (MP), Adper Single Bond 2 (SB) and Clearfil SE Bond (CSB) were applied in one layer (MP-I, SB-I and CSB-I) and in two layers (MP-II, SB-II and CSB-II). The cavities were restored with Z250 resin composite. After 48 hours, beams were obtained (n = 15/group) for microTBS testing, and slices containing the two restorations were obtained for internal adaptation analysis. The beams were submitted to the microTBS test on a universal testing machine (EMIC DL-2000) and the failures were analyzed by SEM. The slices were analyzed under an optical microscope and the types and amounts of internal failures (gap, crack, rupture) were classified. The mean values of microTBS (MPa) were: MP-II: 56.92; MP-I: 52:23; CSB-II: 47:71; CSB-I: 42.25; SB-I: 35.12 and SB-II: 34.69. According to two-way ANOVA (alpha = 0.05), the independent variables adhesive system (p = 0.001) and the number of layers (p = 0.025) presented significant difference. The mixed failure was predominant in all groups. For the internal adaptation analysis, the Kruskal-Wallis test (alpha = 0.05) showed statistical differences for cracks and ruptures between the adhesive systems. SB-I and II were shown to have the highest values for cracks, and MP-I demonstrated the lowest. SB-II showed significantly higher values for rupture. The application of two layers promoted a slight increase in microTBS for Scotchbond MP and Clearfil SE Bond, but it did not improve the internal adaptation for the tested adhesive systems.
本研究评估了三种粘接系统的粘接层数量对牙本质微拉伸粘接强度（microTBS）和牙体结构与树脂复合材料修复体之间内部适应的影响。在 30 颗牛切牙的颊面制作了两个窝洞（C 因子=3）。 Scotchbond Multi-Purpose（MP）、Adper Single Bond 2（SB）和 Clearfil SE Bond（CSB）分别单层（MP-I、SB-I 和 CSB-I）和双层（MP-II、SB-II 和 CSB-II）应用。用 Z250 树脂复合材料修复窝洞。48 小时后，每组获得 15 个试件进行微拉伸强度测试，获得包含两个修复体的切片进行内部适应分析。试件在万能试验机（EMIC DL-2000）上进行微拉伸强度测试，并用扫描电镜分析破坏情况。对切片进行光学显微镜分析，对内部失效类型和数量（间隙、裂纹、破裂）进行分类。微拉伸强度（MPa）的平均值为：MP-II：56.92；MP-I：52.23；CSB-II：47.71；CSB-I：42.25；SB-I：35.12 和 SB-II：34.69。根据双因素方差分析（alpha=0.05），独立变量粘接系统（p=0.001）和粘接层数（p=0.025）有显著差异。所有组均以混合失效为主。对于内部适应分析，Kruskal-Wallis 检验（alpha=0.05）显示粘接系统之间在裂纹和破裂方面存在统计学差异。SB-I 和 II 的裂纹值最高，MP-I 的最低。SB-II 的破裂值显著较高。 Scotchbond MP 和 Clearfil SE Bond 的双层应用略微提高了微拉伸强度，但并未改善测试粘接系统的内部适应。
