Abstract

This study investigated the load bearing capacity of intraradicular posts and core materials under static and dynamic loading. Human teeth with single root (N = 154, n = 14 per sub group) were endodontically prepared and randomly divided into six groups: CON: Sound premolars; TP: Titanium post (Flat Head T); FRCP: Indirect E-glass FRC post (FRC Postec Plus); FRCC: Fiber-reinforced resin composite (Everex Posterior) as post and core; RCW: Hybrid composite (Tetric) as post and core with woven fiber network (EverNet) between root canal and core; RC: Hybrid composite (Tetric) as post and core material. Groups TP, FRCP were luted adhesively in the root canal (Panavia 21), while other groups were bonded directly to the intraradicular dentin. In groups TP, FRCP, RCW, core material was hybrid composite. The teeth were then restored with CAD/CAM resin composite (ArtBlock Temp). While half of the specimens in each group were fractured after 4 weeks water storage, the other half was subjected to chewing simulation (x1.200.000; 5–55 °C). Data for F_initial (N) and F_max (N) were analyzed using 2-way ANOVA and Tukey’s tests (alpha = 0.05). Fracture strength values were significantly affected by the post and core type (p < 0.05) and the fatigue conditions (p < 0.05). After cyclic loading, F_initial values were significantly lower for TP (222.70) and RCW (238.60), compared to other groups (335.50 − 377.20) (p < 0.05) and F_max was significantly lower for RCW (742.11). TP group presented mainly cohesive failure in the crown material with adhesive detachment from the post core and other groups showed predominantly irreparable failures.

摘要

本研究调查了根内桩和芯材在静态和动态载荷下的承载能力。单根人牙 ( N  = 154, n = 每个亚组 14 个）进行牙髓制备并随机分为六组： CON：健全的前磨牙；TP：钛柱（平头T）；FRCP：间接E-玻璃FRC柱（FRC Postec Plus）；FRCC：纤维增强树脂复合材料（Everex Postior）作为支柱和核心；RCW：混合复合材料 (Tetric) 作为桩核，在根管和核芯之间采用编织纤维网络 (EverNet)；RC：混合复合材料（Tetric）作为支柱和核心材料。TP、FRCP 组在根管内粘合（Panavia 21），而其他组则直接与根内牙本质粘合。在 TP、FRCP、RCW 组中，核心材料是混合复合材料。然后用 CAD/CAM 树脂复合材料 (ArtBlock Temp) 修复牙齿。虽然每组中一半的标本在 4 周的水储存后断裂，另一半进行咀嚼模拟 (x1.200. 000; 5–55 °C）。数据为F _initial (N) 和F _max (N) 使用 2-way ANOVA 和 Tukey 检验 (alpha = 0.05) 进行分析。断裂强度值受桩核类型 ( p  < 0.05) 和疲劳条件 ( p  < 0.05) 的显着影响。循环加载后，与其他组 (335.50 - 377.20) 相比，TP (222.70) 和 RCW (238.60) 的F_初始值显着较低 ( p  < 0.05)，RCW (742.11) 的F _max显着较低。TP 组主要表现为牙冠材料的内聚破坏，与桩核的粘合剂分离，其他组主要表现为不可修复的破坏。