Department of Restorative Dentistry, Federal University of Pelotas, Pelotas, Brazil.
J Adhes Dent. 2010 Apr;12(2):109-15. doi: 10.3290/j.jad.a17529.
To evaluate the effect of additional acid etching on the microtensile bond strength (μTBS) and Weibull modulus (m) of two adhesive systems applied to caries-affected dentin.
Ninety human molars with coronal carious lesions were sectioned to produce flat coronal surfaces containing caries-affected (CAD) and sound dentin (SD). The teeth were allocated to 6 groups: SB-CT: Control - Single Bond applied according to the manufacturer's instructions; SB+15: Single Bond with additional 35% phosphoric acid etching for 15 s; SB+30: Single Bond with additional etching for 30 s; CF-CT: Control - Clearfil SE Bond applied according to the manufacturer's instructions; CF+15: Clearfil SE Bond with additional 35% phosphoric acid etching for 15 s; CF+30: Clearfil SE Bond with additional etching for 30 s. Composite crowns were incrementally built up. The teeth were sectioned after 24 h in order to produce 2 to 3 slices involving each dentin substrate. The slices were trimmed into hourglass-shaped specimens (n = 30) and tested in tension at a crosshead speed of 1 mm/min. Data were analyzed by three-way ANOVA, Tukey's test (p < 0.05) and Weibull statistics.
The μTBS to CAD was lower than to SD, except for SB+30. The additional etching increased the μTBS to CAD. The μTBS to SD increased with CF, but decreased with SB. CAD produced lower values of m with both adhesive systems. SB resulted in lower m in sound dentin than CF. The additional etching did not affect the m.
The additional etching increases the μTBS to CAD, but not enough to reach the μTBS values obtained in SD. The structural reliability of the bond to CAD is not affected by the additional etching.
评估在两种应用于龋损牙本质的黏接系统中额外酸蚀对微拉伸黏接强度（μTBS）和威布尔模数（m）的影响。
90 颗人磨牙的冠部有龋损病变，将其切片以产生包含龋损（CAD）和健康牙本质（SD）的平坦冠部表面。这些牙齿被分配到 6 个组中：SB-CT：对照 - 按照制造商的说明应用单键；SB+15：单键额外用 35%磷酸酸蚀 15 秒；SB+30：单键额外酸蚀 30 秒；CF-CT：对照 - 按照制造商的说明应用 Clearfil SE Bond；CF+15：Clearfil SE Bond 额外用 35%磷酸酸蚀 15 秒；CF+30：Clearfil SE Bond 额外酸蚀 30 秒。逐步构建复合冠。在 24 小时后将牙齿切割，以便产生涉及每个牙本质基质的 2 到 3 个切片。将这些切片修整成沙漏形试件（n = 30），并以 1mm/min 的十字头速度进行拉伸测试。数据通过三因素方差分析、Tukey 检验（p < 0.05）和威布尔统计进行分析。
CAD 的 μTBS 低于 SD，除了 SB+30 之外。额外的酸蚀增加了 CAD 的 μTBS。CF 增加了 SD 的 μTBS，但 SB 降低了 SD 的 μTBS。两种黏接系统在 CAD 中均产生较低的 m 值。SB 在健康牙本质中产生的 m 值低于 CF。额外的酸蚀对 m 没有影响。
额外的酸蚀增加了 CAD 的 μTBS，但不足以达到 SD 中获得的 μTBS 值。CAD 处的黏接结构可靠性不受额外酸蚀的影响。
