OBJECTIVE The aim of this study was to evaluate the fracture resistance of simulated immature roots using Biodentine (BD) and fiber post (FP) compared with different root canal-filling materials under aging conditions. MATERIALS AND METHODS One hundred and forty maxillary central anterior teeth were randomly divided into seven groups (n = 20/group). Negative control received no treatment. In the other groups, the root canals were prepared to simulate immature teeth. The root canals were filled with a 4-mm apical plug of BD and restored intraradicular with BD, BD + FP, composite resin (CR), CR + FP, and gutta-percha (GP). Positive controls were instrumented but without restoration. Teeth were subjected to thermocycling and received cyclic loading before fracture resistance test. Fracture resistance was conducted using a universal testing machine with a crosshead speed of 0.5 mm/min until fracture. Load to fracture was recorded in newtons (N). Data were statistically analyzed using one-way analysis of variance and Tukey's test at P < 0.05. RESULTS Root canals restored intraradicular with BD + FP and CR + FP showed the highest fracture resistance compared with the other experimental groups (P < 0.001). There was no significant difference in the fracture resistance between CR and BD groups (P = 0.998). GP and positive control groups were significantly lower resistance to fracture than the other groups (P < 0.001). CONCLUSIONS Intraradicular reinforcement with BD + FP and CR + FP enhanced the fracture resistance of simulated immature teeth than the other experimental groups. CLINICAL RELEVANCE Biodentine or composite resin combined with fiber post could be used to reinforce immature teeth with an apical Biodentine plug.

中文翻译：

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在老化条件下，使用Biodentine和纤维桩对模拟的未成熟根的耐断裂性与不同的充填材料进行比较。

目的本研究的目的是评估在老化条件下，使用Biodentine（BD）和纤维桩（FP）与不同的根管填充材料相比，模拟未成熟根的抗断裂性。材料与方法将一百零四只上颌中央前牙随机分为7组（n = 20 /组）。阴性对照未接受治疗。在其他组中，准备了根管以模拟未成熟的牙齿。根管充满BD的4 mm顶塞，并用BD，BD + FP，复合树脂（CR），CR + FP和牙胶（GP）进行根管内修复。使用了阳性对照但未恢复。在抗断裂测试之前，对牙齿进行热循环并承受循环载荷。使用万能试验机以0.5mm / min的十字头速度进行抗断裂直到断裂。以牛顿（N）记录断裂载荷。使用单向方差分析和Tukey检验在P <0.05时对数据进行统计分析。结果与其他实验组相比，用BD + FP和CR + FP根管修复的根管显示出最高的抗断裂性（P <0.001）。CR和BD组之间的抗断裂性没有显着差异（P = 0.998）。GP和阳性对照组的骨折抵抗力明显低于其他组（P <0.001）。结论BD + FP和CR + FP根治术比其他实验组增强了模拟未成熟牙齿的抗断裂性。