Department of Endodontics, Faculty of Dental Medicine, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania.
Department of Esthetics, Faculty of Dental Medicine, "Carol Davila" University of Medicine and Pharmacy, Bucharest, Romania.
J Med Life. 2021 Jan-Mar;14(1):81-85. doi: 10.25122/jml-2020-0180.
This study aims to determine whether the design of resin posts reinforced with glass fiber (FRC) and Reporfost (Angelus, Londrina, PR, Brazil) significantly improves the fracture resistance of endodontically treated teeth restored through this method.A batch of 30 maxillary monoradicular teeth (15 central incisors, 15 canines) were treated endodontically by step-back technique (apical enlargement 40-K file) sealed with Sealapex (Kerr Corporation, Orange, US) and gutta-percha by lateral condensation, cold. They were divided into two equal groups, prepared for cementing the FRC posts. The Exacto posts (Angelus, Londrina, PR, Brazil) in group 1 and the Reforpost posts (Angelus; Londrina; PR, Brazil) were cemented with dual cure resin cement Breeze Self-Adhesive Resin Cement (Pentron Clinical, Orange, US). Fracture resistance testing was performed on the crown-apical axial direction, using the Hounsfield / Tinius Olsen H1-KS, PA, USA mechanical testing apparatus. The behavior of each tooth-post assembly was recorded as a graph. The statistical analysis was done using one way ANOVA (α=0.05). The differences between the Exacto post group and the Reforpost post group are not statistically significant (p = 0.466). The maximum force recorded was 970 N and the minimum 186N. The mean force at which the fracture occurred was approximately 500N for both groups. The strain test showed that modifying the Reforpost post design did not improve the fracture resistance parameters of the tooth-post assembly through increasing the surface friction or maintaining adhesion to the walls of the root dentin.
本研究旨在确定纤维增强玻璃（FRC）和 Reporfost（Angelus，Londrina，PR，巴西）树脂桩的设计是否能显著提高通过该方法修复的根管治疗牙的抗折能力。
一批 30 颗上颌单根牙（15 颗中切牙，15 颗尖牙）采用后退技术（根尖扩大 40-K 锉）进行根管治疗，用 Sealapex（Kerr Corporation，Orange，US）和冷牙胶侧向加压密封。它们被分为两组，每组 15 个，用于粘结 FRC 桩。第一组用 Exacto 桩（Angelus，Londrina，PR，巴西），第二组用 Reforpost 桩（Angelus；Londrina；PR，巴西），均用双固化树脂粘结剂 Breeze Self-Adhesive Resin Cement（Pentron Clinical，Orange，US）粘结。在冠-根尖轴向方向进行抗折强度测试，使用 Hounsfield/Tinius Olsen H1-KS，PA，USA 机械测试仪器。记录每个牙-桩组件的行为作为图表。使用单因素方差分析（α=0.05）进行统计分析。Exacto 桩组和 Reforpost 桩组之间的差异无统计学意义（p=0.466）。记录的最大力为 970N，最小力为 186N。两组的断裂发生时的平均力约为 500N。应变测试表明，通过增加表面摩擦力或保持与根管壁的粘附性，修改 Reforpost 桩的设计并不能提高牙-桩组件的抗折能力参数。
