Sismanoglu S, Yildirim-Bilmez Z, Gurcan A T, Gumustas B, Taysi M, Berkman M
Department of Restorative Dentistry, Faculty of Dentistry, Altınbaş University, 34147, Bakirkoy/Istanbul, Turkey.
Department of Restorative Dentistry, Faculty of Dentistry, Hatay Mustafa Kemal University, Hatay, Turkey.
Odontology. 2022 Jan;110(1):148-156. doi: 10.1007/s10266-021-00650-z. Epub 2021 Aug 9.
The objective of the present in vitro study was to evaluate micro-tensile bond strength (µSBS) of MTA cements to composite resin using a universal adhesive after internal bleaching procedure, and to examine surface characteristics of MTA cements exposed to bleaching agents. MTA specimens were divided into three subgroups according to the bleaching agent used which were, 37% carbamide peroxide (CP), 35% hydrogen peroxide (HP), and no exposure as a control group (n = 12). After exposure to bleaching agent, composite resins were applied to MTA surfaces using a universal adhesive in self-etch mode. The specimens were exposed to a shear force until failure to evaluate bond strength. MTA surfaces were investigated using scanning electron microscopy (SEM) to observe the effects of the bleaching agents. Differences between groups were analyzed using two-way ANOVA test and intergroup comparisons were assessed with Tukey test (p < 0.05). Although there was a slight difference in bond strength between bleaching agents (CP and HP), no significant difference was found, irrespective of MTA cement. After the HP application, the bond strength values decreased approximately by half compared with the controls. SEM results demonstrated distinct morphological differences between the intact MTA surface (control) and treated MTA surface. Distinct micro-cracks, surface irregularities, and capillary voids formed due to the superficial dissolution caused by peroxides. Exposure to the intra-coronal bleaching agents had a negative influence on the surface morphology of MTA cements and their bond strength to composite resin.
本体外研究的目的是评估在进行内漂白程序后，使用通用粘结剂时MTA水门汀与复合树脂之间的微拉伸粘结强度（µSBS），并检查暴露于漂白剂后的MTA水门汀的表面特征。根据所使用的漂白剂，将MTA样本分为三个亚组，分别为37%过氧化脲（CP）、35%过氧化氢（HP），未暴露组作为对照组（n = 12）。暴露于漂白剂后，使用通用粘结剂以自酸蚀模式将复合树脂应用于MTA表面。对样本施加剪切力直至破坏以评估粘结强度。使用扫描电子显微镜（SEM）研究MTA表面，以观察漂白剂的效果。使用双向方差分析检验分析组间差异，并用Tukey检验进行组间比较（p < 0.05）。尽管漂白剂（CP和HP）之间的粘结强度存在细微差异，但无论MTA水门汀如何，均未发现显著差异。与对照组相比，应用HP后，粘结强度值下降了约一半。SEM结果表明，完整的MTA表面（对照组）与处理后的MTA表面之间存在明显的形态差异。由于过氧化物引起的表面溶解，形成了明显的微裂纹、表面不规则和毛细孔隙。冠内漂白剂的暴露对MTA水门汀的表面形态及其与复合树脂的粘结强度有负面影响。
