Toledano Manuel, Osorio Raquel, Moreira Mario A G, Cabrerizo-Vilchez Miguel A, Gea Pedro, Tay Franklin R, Pashley David H
Department of Dental Materials, School of Sciences, University of Granada, Spain.
Am J Dent. 2004 Oct;17(5):310-4.
To evaluate the microtensile bond strength (MTBS) of a resin-based composite to smear layer-covered dentin using a self-etching primer, Clearfil SE Bond (CSEB), under two different hydration states. Surface roughness and wettability (contact angle measurements) of water and the CSEB primer were also evaluated on this substrate.
Contact angle (CA) measurements were performed on four caries-free extracted human third molars. The specimens were sectioned parallel to the occlusal surface to expose the moderately deep dentin and ground flat (180-grit SiC) under water to provide uniform flat surfaces. In two samples, the smear layer was completely air-dried; in the other two specimens, the smear layer was briefly air-dried. Contact angle measurements were performed to assess wettability of water and CSEB primer using the Axisymmetric Drop Shape Analysis technique. Surface roughness (SR) was determined with a contact profilometer. In another four molars, CSEB was applied to the smear layer-covered dentin with both hydration states. Resin build-ups were performed incrementally with Tetric Ceram. After storage for 24 hours in water at 37 degrees C, the teeth were sectioned to obtain bonded beams with an average cross-sectional area of 1.0 mm2. Each beam was tested in tension in an Instron machine at 0.5 mm/minute. Kolmogorov-Smirnov and Student t-tests were performed at a 95% significance level.
Observed water contact angles were lower on the hydrated smear layer but no differences were found between contact angles on completely and briefly air-dried smear layer when the primer was used for CA measurements. SR was similar for both substrates and MTBS was greater when the adhesive was applied on the completely air-dried smear layer.
使用自酸蚀底漆Clearfil SE Bond（CSEB），在两种不同的水化状态下，评估树脂基复合材料与涂抹层覆盖的牙本质之间的微拉伸粘结强度（MTBS）。还在此底物上评估了水和CSEB底漆的表面粗糙度和润湿性（接触角测量）。
对四颗无龋的拔除人类第三磨牙进行接触角（CA）测量。将标本平行于咬合面切开，以暴露中度深层牙本质，并在水下磨平（180目SiC）以提供均匀的平坦表面。在两个样本中，涂抹层完全风干；在另外两个标本中，涂抹层短暂风干。使用轴对称滴形分析技术进行接触角测量，以评估水和CSEB底漆的润湿性。用接触式轮廓仪测定表面粗糙度（SR）。在另外四颗磨牙中，将CSEB应用于两种水化状态下的涂抹层覆盖的牙本质。用Tetric Ceram逐层进行树脂堆积。在37℃水中储存24小时后，将牙齿切开以获得平均横截面积为1.0平方毫米的粘结梁。每根梁在Instron机器中以0.5毫米/分钟的速度进行拉伸测试。在95%的显著性水平下进行Kolmogorov-Smirnov检验和Student t检验。
在水化的涂抹层上观察到的水接触角较低，但当使用底漆进行CA测量时，完全风干和短暂风干的涂抹层之间的接触角没有差异。两种底物的SR相似，当粘合剂应用于完全风干的涂抹层时，MTBS更大。
