Morphological Analysis and Bond Strength to Root Canal Dentin of Endodontically Treated and Retreated Teeth: An Ex Vivo Study.

Mario Alovisi, Pietro Palopoli, Allegra Comba, Leandro Allais, Andrea Roggia, Andrea Baldi, Damiano Pasqualini, Elio Berutti, Nicola Scotti
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Abstract

Purpose: To assess the bond strength and the hybrid layer (HL) micro-morphological characteristics at the cement-dentin interface (CD-i) between root canal walls and two adhesive resin cements [self-etch (SERc) and self-adhesive (SARc)] in root-canal-treated (RCT) and naturally aged retreated teeth (RCR-T).

Materials and methods: Vital (n = 16) and RCT (n = 16) teeth were, respectively, endodontically treated or retreated. Fiber posts were luted either with SERc (Clearfil Universal Bond Quick + DC Core Plus) or SARc (iCEM). Samples were then sectioned into 1 mm thick slices perpendicular to the fiber post and submitted to push-out bond strength test. Vital (n = 4) and RCT (n = 4) first maxillary molars were also selected and prepared to evaluate CD-i morphology through confocal laser scanning microscopy (CLSM). Three-way analysis of variance (ANOVA) and Tukey post-hoc tests were assessed to statistically analyze the obtained data (p 0.05).

Results: Bond strength was significantly jeopardized in retreated teeth and in the root apical half, while the cements had no significant influence. Most failures occurred between dentin and resin cement. HL thickness was also hindered in retreated teeth. iCEM produced a thinner HL compared to SERc. Resin tag formation was significantly hampered in the root apical half.

Conclusions: SARc performed as well as SERc on aged RCT radicular dentin. Clinicians can rely on simplified one-step luting systems when adhesion is required in unfavorable substrates such as the root canal post space of aged RCT teeth.

根管治疗和再治疗牙齿的形态分析及与根管牙本质的粘结强度:体外研究
目的:评估根管治疗牙(RCT)和自然老化修复牙(RCR-T)的根管壁与两种粘接性树脂水门汀(自粘接(SERc)和自粘接(SARc))之间的粘接强度和水门汀界面(CD-i)混合层(HL)的微形态特征:活力牙(n = 16)和 RCT 牙(n = 16)分别进行了根管治疗或再修复。使用 SERc(Clearfil Universal Bond Quick + DC Core Plus)或 SARc(iCEM)对纤维桩进行固位。然后将样本切成垂直于纤维桩的 1 毫米厚片,并进行推出粘接强度测试。还选择并制备了 Vital(n =;4)和 RCT(n =;4)第一上颌磨牙,通过共聚焦激光扫描显微镜(CLSM)评估 CD-i 形态。采用三因子方差分析(ANOVA)和Tukey事后检验对所得数据进行统计分析(P 0.05):结果:修复后的牙齿和根尖半部的粘接强度明显受到影响,而粘结剂则没有明显影响。大多数失败发生在牙本质和树脂粘结剂之间。与 SERc 相比,iCEM 产生的 HL 更薄。在根尖半部,树脂标签的形成明显受阻:结论:在老化的 RCT 根状牙本质上,SARc 和 SERc 的效果一样好。当需要在不利的基质(如老化 RCT 牙的根管柱间隙)上进行粘接时,临床医生可以依靠简化的一步式粘接系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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