Augusto M G, Torres Crg, Pucci C R, Schlueter N, Borges A B
Oper Dent. 2018 May/Jun;43(3):291-300. doi: 10.2341/16-173-L.
Erosive/abrasive challenges can potentially compromise bonding to dentin. Aiming to improve the quality and stability of bonding to this substrate, this study investigated the combined effect of erosion and toothbrush abrasion on the microtensile bond strength (μTBS) stability to dentin using a universal adhesive system in total and self-etching modes, associated or not associated with deproteinization.
Bovine dentin specimens were divided into five groups according to the organic matrix condition (n=20): control (C); erosion (E); erosion + abrasion (EA); erosion + sodium hypochlorite (EH); erosion + abrasion + sodium hypochlorite (EAH). The groups were further divided (n=10) according to the mode of application (total or self-etching) of a universal adhesive. After the bonding procedure, composite blocks were built up, and the samples were cut to obtain sticks for μTBS testing. For each specimen, one-half of the sticks was immediately tested, and the other one-half was tested after artificial aging (5000 thermocycles, 5°C and 55°C).
Three-way analysis of variance (α=5%) showed a significant difference for the triple interaction ( p=0.0007). Higher μTBS means were obtained for the EH and EAH groups compared with the E and EA groups. The control group showed immediate μTBS values similar to that of the E and EA groups for both bond strategies.
Erosion and erosion/abrasion did not significantly influence the immediate μTBS to dentin. Artificial aging reduced μTBS values for the groups C, E, and EA using the total-etching mode. Deproteinization maintained the bond stability to artificially aged eroded and eroded/abraded dentin.
酸蚀/磨损挑战可能会削弱与牙本质的粘结。为了提高与该底物粘结的质量和稳定性，本研究使用通用粘结系统，在全酸蚀和自酸蚀模式下，研究了酸蚀和牙刷磨损联合作用对牙本质微拉伸粘结强度（μTBS）稳定性的影响，同时考察了是否进行去蛋白处理。
根据有机基质条件将牛牙本质标本分为五组（n = 20）：对照组（C）；酸蚀组（E）；酸蚀+磨损组（EA）；酸蚀+次氯酸钠组（EH）；酸蚀+磨损+次氯酸钠组（EAH）。根据通用粘结剂的应用模式（全酸蚀或自酸蚀）将每组进一步分为两组（n = 10）。粘结程序完成后，构建复合树脂块，并将样本切割成小棒用于μTBS测试。对于每个标本，一半的小棒立即进行测试，另一半在人工老化（5000次热循环，5°C和55°C）后进行测试。
三因素方差分析（α = 5%）显示三因素交互作用有显著差异（p = 0.0007）。与E组和EA组相比，EH组和EAH组获得了更高的μTBS均值。对于两种粘结策略，对照组的即时μTBS值与E组和EA组相似。
酸蚀和酸蚀/磨损对即时牙本质μTBS没有显著影响。人工老化降低了全酸蚀模式下C组、E组和EA组的μTBS值。去蛋白处理维持了酸蚀和酸蚀/磨损牙本质人工老化后的粘结稳定性。
