Abstract：
The aim of the present study was to evaluate the effect of short fiber reinforced composite on the fracture strength of anterior immature teeth treated with regenerative endodontic procedures. A total of 120 permanent maxillary central incisors were selected, and root lengths were standardized. Except for the positive control group (n = 20), the root canals were instrumented to simulate immature teeth with incomplete root development, and the regenerative endodontic procedure was performed. Twenty instrumented teeth acted as negative controls (n = 20), and the remaining 80 teeth were randomly divided into 4 groups according to the chosen coronal restoration material: bulk fill, short fiber reinforced composite (SFRC), polyethylene fiber (Ribbond Ultra), and flowable composite resin. Each specimen was then subjected to fracture testing using a universal testing machine (AGS-X, Shimadzu, Japan). The load to fracture was recorded. Data were subjected to statistical analysis using analysis of variance and the Tukey Honestly Significant Difference test. A significant difference was detected between the groups (p < 0.05), with the positive control group showing the highest mean fracture strength. The SFRC group had significantly higher values than the bulk fill, polyethylene fiber, flowable composite resin and negative control groups. In conclusion, SFRC has a relatively high fracture strength compared to other materials used in regenerative endodontic procedures. The use of SFRC enhanced the fracture strength of immature permanent teeth.
摘要：
本研究的目的是评估短纤维增强复合材料对再生牙髓手术治疗的前牙未成熟牙的断裂强度的影响。共选取120颗永久性上颌中切牙,和根长标准化。除阳性对照组(n=20)外，根管被用来模拟牙根发育不完全的未成熟牙齿，并进行了再生牙髓手术。20颗仪器牙齿作为阴性对照(n=20)，其余80颗牙齿根据选择的冠状修复材料随机分为4组:大量填充，短纤维增强复合材料（SFRC），聚乙烯纤维（RibbondUltra），和可流动的复合树脂。然后使用通用试验机（AGS-X，岛津,日本）。记录断裂载荷。使用方差分析和Tukey诚实显著差异检验对数据进行统计分析。两组之间存在显着差异（p<0.05），阳性对照组显示最高的平均断裂强度。SFRC组的值明显高于批量填充组，聚乙烯纤维,流动复合树脂和阴性对照组。总之,与再生牙髓手术中使用的其他材料相比，SFRC具有相对较高的断裂强度。SFRC的使用增强了未成熟恒牙的断裂强度。
