J Adhes Dent. 2018;20(2):165-172. doi: 10.3290/j.jad.a40301.
To evaluate the effect of two endodontic sealers on the push-out bond strength between fiber posts and root canal wall after different storage times and verify the influence of the endodontic sealers on the degree of conversion of composite cements.
A total of 180 bovine teeth were endodontically treated using two endodontic sealers, eugenol-based (Endofill, Dentsply Maillefer) or epoxy resin-based (AH Plus, Dentsply Maillefer). Subsequently, the specimens were stored in 100% relative humidity at 37°C for 24 h, 6 or 12 months. After the respective storage times, the root canals were prepared for fiber post cementation using two composite cements, RelyX U200 (3M) or Multilink Automix (Ivoclar Vivadent). The push-out test and the failure analysis were performed. Degree of conversion was analyzed using a Raman microscope, for which samples were prepared using composite cement only or composite cement plus endodontic sealer. Finally, the push-out data were subjected to statistical analysis and the degree of conversion in percent was calculated.
AH Plus sealer obtained the highest push-out bond strengths at 24 h and 6 months. There was no difference between the push-out bond strengths of AH Plus and Endofill sealer at 1 year (p < 0.05). Moreover, the degree of conversion was affected by the Endofill sealer.
The use of a eugenol-based sealer is not recommended because it affects the push-out bond strength of fiber posts. AH Plus sealer and a post-endodontic waiting time of 24 h is recommended.
评价两种根管封闭剂对纤维桩与根管壁间黏结强度的影响，检测根管封闭剂对复合树脂水门汀转化率的影响。
共 180 颗牛牙经两种根管封闭剂（丁香酚基：Endofill，登士柏麦尔乐；环氧树脂基：AH Plus，登士柏麦尔乐）根管治疗。随后，将样本在 37°C、100%相对湿度下分别储存 24 h、6 个月和 12 个月。在相应的储存时间后，使用两种复合树脂水门汀（RelyX U200，3M；Multilink Automix，义获嘉伟瓦登特）对纤维桩进行根管黏结预备。进行推出试验和失败分析。使用拉曼显微镜分析转化率，其中仅使用复合树脂水门汀或复合树脂水门汀加根管封闭剂制备样本。最后，对推出数据进行统计分析，并计算转化率（%）。
AH Plus 封闭剂在 24 h 和 6 个月时获得了最高的推出黏结强度。在 1 年时，AH Plus 和 Endofill 封闭剂之间的推出黏结强度没有差异（p < 0.05）。此外，Endofill 封闭剂会影响转化率。
不建议使用含有丁香酚的封闭剂，因为它会影响纤维桩的推出黏结强度。建议使用 AH Plus 封闭剂，并在 24 h 后进行根管治疗。
