Endodontic Division, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
J Appl Oral Sci. 2010 Jul-Aug;18(4):385-9. doi: 10.1590/s1678-77572010000400011.
Chemical substances used during biomechanical preparation of root canals can alter the composition of dentin surface and affect the interaction with restorative materials.
The purpose of this study was to evaluate the microtensile bond strength (µTBS) of a self-etching adhesive system to dentin irrigated with sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic acid (EDTA).
Thirty human third molars were sectioned 3 mm below the occlusal surface, polished with 600- to 1200-grit silicon carbide papers, and randomly divided into 3 groups: G1 (control): no irrigating solution; G2: 1% NaOCl; and G3: 1% NaOCl followed by the application of 17% EDTA. The specimens received the self-etching adhesive system (XENO III - Dentsply), restored with microhybrid composite resin (Z250 - 3M ESPE), sectioned and trimmed to create 4 hourglass-shaped slabs of each tooth. The slabs were tested in microtensile strength in a universal testing machine (Emic DL 2000) at a crosshead speed of 0.5 mm/min until fracture. The results were analyzed statistically by ANOVA and Newman-Keuls test.
Mean µTBS values and standard deviations in MPa were: G1 = 11.89 ± 4.22; G2 = 19.41 ± 5.32; G3 = 11.34 ± 4.73. 1% NaOCl increased the adhesive resistance significantly (p<0.001/F=22.5763). The application of 1% NaOCl/17% EDTA resulted in statistically similar µTBS to the control group.
None of the irrigants affected negatively the µTBS of XENO III to dentin. The use of 1% NaOCl alone resulted in higher bond strength than the other treatments. The combination of 1% NaOCl and 17% EDTA produced similar bond strength to that of untreated dentin.
本研究旨在评估自酸蚀黏接剂系统对经次氯酸钠（NaOCl）和乙二胺四乙酸（EDTA）冲洗后的牙本质的微拉伸黏结强度（µTBS）。
将 30 个人类第三磨牙从牙合面下 3mm 处切开，用 600-1200 目碳化硅砂纸抛光，随机分为 3 组：G1（对照组）：不冲洗溶液；G2：1% NaOCl；G3：1% NaOCl 后应用 17% EDTA。用自酸蚀黏接剂系统（XENO III - Dentsply）处理标本，用微混合复合树脂（Z250 - 3M ESPE）修复，切成每个牙齿的 4 个沙漏形薄片。用万能试验机（Emic DL 2000）以 0.5mm/min 的十字头速度进行微拉伸强度测试，直至断裂。用方差分析和 Newman-Keuls 检验对结果进行统计学分析。
G1 组的平均 µTBS 值和标准差为 11.89 ± 4.22MPa；G2 组为 19.41 ± 5.32MPa；G3 组为 11.34 ± 4.73MPa。1% NaOCl 显著提高了黏附力（p<0.001/F=22.5763）。应用 1% NaOCl/17% EDTA 后，µTBS 与对照组相比无统计学差异。
没有一种冲洗液对 XENO III 与牙本质的 µTBS 产生负面影响。单独使用 1% NaOCl 可产生高于其他处理的黏附强度。1% NaOCl 和 17% EDTA 的组合产生与未处理牙本质相似的黏附强度。
