Dental School, CEUMA University (UNICEUMA), Rua Josué Montello n° 1, Renascença II, São Luís, Maranhão, 65075120, Brazil.
Discipline of Endodontics, College of Dentistry, University of Saskatchewan, 105 Wiggins Road, Saskatoon, Saskatchewan, S7N5E4, Canada.
Clin Oral Investig. 2018 Apr;22(3):1403-1409. doi: 10.1007/s00784-017-2230-z. Epub 2017 Oct 11.
This study aims to evaluate the effect of different endodontic sealers (epoxy resin, eugenol, and bioceramic/calcium silicate-based) and the time of cementation (immediately or 7 days after canal obturation) on the bond strength of a fiberglass post cemented with RelyX™ ARC.
Eighty-four premolars were instrumented and divided into groups (n = 12) according to the sealer and the time of post cementation: Endofill (EN), Endosequence BC Sealer (BC), and AH Plus (AH) had immediately fiber post cementation; EN7, BC7, and AH7 had post cementation after 7 days; and control group (C) had fiber post cementation without endodontic sealer. Each post space of the root was cut into slices and submitted to push-out test. Failure mode was assessed. Two-way ANOVA, Tukey's, and Dunnett's tests were used for statistical analysis (α = 5%).
The type of endodontic sealer (p < 0.001), the time of post cementation (p = 0.038), and the interaction sealer time (p = 0.002) had negative influence on bond strength of fiberglass posts cemented with RelyX™ ARC. AH promoted the highest bond strength mean values (21.20 MPa immediately and 15.54 MPa at 7 days). EN (9.75 MPa immediately and 13.15 MPa at 7 days) and BC (10.43 MPa immediately and 5.73 MPa at 7 days) had lower bond strength than AH, regardless the time of cementation.
AH was the best sealer to obturate the root canal when fiberglass cementation with resin-based cement is planned.
The correct choice of an endodontic sealer and the adequate time of post cementation may avoid post dislocation caused by low bond strength to dentin.
本研究旨在评估不同根管封闭剂（环氧树脂、丁香酚和生物陶瓷/硅酸钙基）和粘固时间（根管充填后即刻或 7 天后）对 RelyX™ARC 纤维桩粘结强度的影响。
84 颗前磨牙按封闭剂和粘固时间分组（n=12）：Endofill（EN）、Endosequence BC 封闭剂（BC）和 AH Plus（AH）即刻纤维桩粘固；EN7、BC7 和 AH7 于 7 天后粘固；对照组（C）无根管封闭剂进行纤维桩粘固。每个根根管空间均切割成薄片并进行推出试验。评估失效模式。采用双因素方差分析、Tukey 和 Dunnett 检验进行统计分析（α=0.05）。
根管封闭剂类型（p<0.001）、粘固时间（p=0.038）和封闭剂时间的交互作用（p=0.002）对 RelyX™ARC 纤维桩粘结强度有负面影响。AH 即刻和 7 天后的粘结强度均值最高（分别为 21.20MPa 和 15.54MPa）。EN（即刻 9.75MPa 和 7 天后 13.15MPa）和 BC（即刻 10.43MPa 和 7 天后 5.73MPa）的粘结强度均低于 AH，无论粘固时间如何。
当计划使用树脂基粘结剂粘固纤维桩时，AH 是封闭根管的最佳选择。
正确选择根管封闭剂和适当的粘固时间可以避免由于与牙本质粘结强度低导致的桩脱位。
