Rely XTM U200 versus Rely XTM ARC: a comparison of microtensile bond strength

Abstract Introduction Resin cements are extensively used in the fixation of indirect restorations of ceramics and ceramics, divided into two categories: conventional resin cements, which do not present an inherent adhesion to the dental structure and require the use of an adhesive system, and the self-adhesive resin cements, which do not require a prior adhesive treatment of the dental substrate. Objective: To evaluate the microtensile bond strength of two resin-based cements, conventional and self-adhesive, according to required operating protocols, when luting ceramic and indirect composite restorations. Material and method Human molars (n=20) donated by UNIFAL teeth bank were prepared and, after being divided into two groups, ceramic or composite cylinders were luted to them with two resin-based cements (conventional and self-adhesive). Prepared teeth were sectioned vertically in both buccal-lingual and mesio-distal directions, to obtain 8 mm high, square-shaped “sticks” that were subject to microtensile bond strength test, and the necessary force to fracture them was evaluated. Results were subject to two-way ANOVA and Tukey test. Result Minimum and maximum forces to disrupt conventional cement were greater than the required one for self-adhesive cement, as well as mean bond strength, despíte of the restorative material. Tukey test showed that diferences were statistically significant, regardless the restorative material. Conclusion Restorative materials did not influence microtensile bond strength values, with no statistically significant differences. The difference between microtensile bond strength values of resin cements tested was statistically significant.

【摘要】树脂水门汀（resin cements）被广泛应用于陶瓷间接修复体的固位，可分为两类：传统型树脂水门汀，其本身不具备牙体组织固有粘接性能，需配合粘接系统使用；以及自粘接树脂水门汀（self-adhesive resin cements），无需对牙体基质进行预先粘接处理。
目的：评估两种树脂基水门汀（resin-based cements，传统型与自粘接型）按照标准操作流程，用于粘接陶瓷与间接复合树脂修复体时的微拉伸粘接强度（microtensile bond strength）。
材料与方法：选取UNIFAL牙齿库捐赠的20颗人类磨牙（n=20）进行牙体预备，将样本分为两组后，分别使用两种树脂基水门汀粘接陶瓷或复合树脂圆柱状修复体。将预备后的磨牙沿颊舌向与近远中向垂直切割，制备出高度为8mm的方形试条，随后开展微拉伸粘接强度测试，记录使试条断裂所需的载荷。实验数据采用双因素方差分析（two-way ANOVA）与Tukey检验（Tukey test）进行统计学分析。
结果：无论修复材料类型如何，传统型树脂水门汀的最小与最大断裂载荷均高于自粘接型树脂水门汀，其平均粘接强度亦更高。Tukey检验结果显示，无论修复材料类型如何，组间差异均具有统计学意义。
结论：修复材料类型对微拉伸粘接强度值无显著影响，组间无统计学差异；本次研究所测试的两种树脂水门汀的微拉伸粘接强度差异具有统计学意义。