Aleisa Khalil, Al-Dwairi Ziad Nawaf, Alsubait Sara A, Morgano Steven M
Professor, Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Professor, Department of Prosthodontics, Faculty of Dentistry, Jordan University of Science and Technology, Irbid, Jordan.
J Prosthet Dent. 2016 Jul;116(1):85-90. doi: 10.1016/j.prosdent.2015.12.010. Epub 2016 Feb 26.
Currently, no standard luting protocol exists for fiber posts. In addition, no agreement has been reached on the time interval between canal obturation and post space preparation and cementation.
The purpose of this in vitro study was to evaluate the retention of fiber posts cemented with 3 different types of cement: Paracore, Variolink II, and RelyX Unicem cement after 24 hours or 2 weeks in root canals obturated with gutta percha and a eugenol-based sealer.
Seventy-two caries-free, freshly extracted, single-rooted human mandibular first premolar teeth with straight root canals were prepared and obturated with gutta percha and Endofil sealer. Specimens were divided into 2 groups (n=36): post spaces prepared 24 hours after obturation and post spaces prepared 2 weeks after obturation. Posts in both groups were luted with 1 of 3 different luting agents (n=12), ParaCore, Variolink II, or RelyX Unicem cement. Each tooth specimen was vertically secured in a universal testing machine, and a constant pull-out loading rate of 0.5 mm/min was applied until cement failure occurred. Data were statistically analyzed with 2-way and 1-way ANOVAs and t tests.
Two-way ANOVA indicated statistically significant differences in mean post retention among the 3 cement types (P<.001) and among the means of the different time intervals investigated (P<.001). Significant differences were noted among all cement types tested between the 24-hour and 2-week time intervals (P<.05).
Time elapsed between canal obturation and post cementation significantly influenced fiber post retention, regardless of the type of resin cement. Fiber posts showed significantly higher retention if cemented after 24 hours of obturation than if cementation occurred after 2 weeks.
目前，对于纤维桩尚无标准的粘结方案。此外，关于根管充填与桩道预备及粘结之间的时间间隔也未达成共识。
本体外研究的目的是评估在用牙胶尖和丁香酚类封闭剂充填根管后24小时或2周时，用3种不同类型的粘结剂（Paracore、Variolink II和RelyX Unicem粘结剂）粘结的纤维桩的固位力。
选取72颗无龋、新鲜拔除的、具有直根管的人下颌第一前磨牙，进行根管预备，并用牙胶尖和Endofil封闭剂充填。将标本分为2组（n = 36）：一组在充填后24小时预备桩道，另一组在充填后2周预备桩道。两组中的桩均用3种不同粘结剂中的1种（n = 12）进行粘结，即ParaCore、Variolink II或RelyX Unicem粘结剂。将每个牙齿标本垂直固定在万能试验机中，以0.5 mm/min的恒定拔出加载速率施加荷载，直至粘结剂失效。数据采用双向和单向方差分析以及t检验进行统计学分析。
双向方差分析表明，3种粘结剂类型之间（P <.001）以及所研究的不同时间间隔之间（P <.001）的平均桩固位力存在统计学显著差异。在24小时和2周时间间隔之间，所有测试的粘结剂类型之间均存在显著差异（P <.05）。
根管充填与桩粘结之间的时间间隔显著影响纤维桩的固位力，无论树脂粘结剂的类型如何。根管充填24小时后粘结的纤维桩比2周后粘结的纤维桩显示出显著更高的固位力。
