Uzunoglu Emel, Eymirli Ayhan, Uyanik Mehmet Özgür, Nagas Emre, Çehreli Zafer Cavit
Faculty of Dentistry, Department of Endodontics, Hacettepe University, Ankara, Turkey.
Faculty of Dentistry, Department of Pediatric Dentistry, Hacettepe University, Ankara, Turkey.
Aust Endod J. 2018 Dec;44(3):235-239. doi: 10.1111/aej.12236. Epub 2017 Sep 21.
The aim of this study was to evaluate the fracture resistance of simulated immature teeth after internal bleaching. The teeth were assigned as follows (n = 12/group); Group-1: The pulp chamber was filled with ProRootMTA and bleached intracoronally with sodium perborate mixed with 37% carbamide peroxide gel; Group-2: The pulp chamber was filled with ProRootMTA without bleaching; Group-3: The pulp chamber was filled with Biodentine and bleached intracoronally as Group-1; Group-4: The pulp chamber was filled with Biodentine without bleaching; and Group-5: Teeth received no intervention (control). The specimens were loaded vertically until root fracture occurred. The data were analysed with Kruskal-Wallis and Dunn tests. There was no significant difference between the fracture resistances of the experimental groups (P > 0.05). However, all experimental groups had significantly lower fracture resistance than the control group (P < 0.05). Neither the tested calcium silicate cements nor the bleaching procedures had a significant impact on fracture resistance values.
本研究的目的是评估内漂白后模拟未成熟牙齿的抗折性。牙齿分组如下（每组n = 12）；第1组：髓腔用ProRootMTA充填，并用与37%过氧化脲凝胶混合的过硼酸钠进行冠内漂白；第2组：髓腔用ProRootMTA充填，不进行漂白；第3组：髓腔用Biodentine充填，并像第1组一样进行冠内漂白；第4组：髓腔用Biodentine充填，不进行漂白；第5组：牙齿不做干预（对照组）。垂直加载标本直至发生牙根折断。数据采用Kruskal-Wallis检验和Dunn检验进行分析。实验组之间的抗折性无显著差异（P > 0.05）。然而，所有实验组的抗折性均显著低于对照组（P < 0.05）。所测试的硅酸钙水门汀和漂白程序均对抗折性值无显著影响。
