De-Deus Gustavo, BrandÓo Maria Claudia, Souza Erick Miranda, Reis Claudia, Reis Kátia, Machado Ricardo, Neelakantan Prasanna
Department of Endodontics, Fluminense Federal University, Rio de Janeiro, Brazil.
Department of Peridontology, Central Airforce Hospital, Rio de Janeiro, Brazil.
Eur Endod J. 2017 Mar 14;2(1):1-5. doi: 10.5152/eej.2017.16059. eCollection 2017.
This study sought to evaluate the effect of the penetration of an epoxy resin-based root canal sealer into dentin tubules on the force required to dislodge the root canal filling.
Sixty extracted human central incisors with single canals were decoronated, instrumented, and filled with gutta-percha and AH Plus sealer labeled with 0.1% rhodamine B dye. The roots were further sectioned horizontally at 3, 6, and 8 mm from the apex. The coronal surfaces of the resulting 180 slices were evaluated using confocal laser scanning microscopy to measure the amount of sealer that penetrated into the dentin tubules. To quantify the force required to dislocate the root filling material, the root fillings of the slices were subjected to a dislodgement resistance test (push-out). Spearman's rho correlation test was further used to test the correlation between the push-out bond strength and sealer penetration into the dentin tubules (P<0.05).
No significant correlation was observed between sealer penetration into the dentin tubules and the force required to dislodge the root canal filling (P=0.626).
Following the results of this study, the penetrating ability of the AH Plus sealer into dentin tubules has no correlation with the force required to dislodge the root canal filling.
本研究旨在评估基于环氧树脂的根管封闭剂渗入牙本质小管对根管充填物脱位所需力的影响。
选取60颗拔除的单根管人正中切牙，去除冠部，进行根管预备，并用含0.1%罗丹明B染料标记的牙胶和AH Plus封闭剂进行充填。将牙根从根尖分别在3mm、6mm和8mm处水平切片。使用共聚焦激光扫描显微镜评估所得180个切片的冠部表面，以测量渗入牙本质小管的封闭剂的量。为了量化使根管充填材料脱位所需的力，对切片的根管充填物进行抗脱位试验（推出试验）。进一步使用Spearman秩相关检验来测试推出粘结强度与封闭剂渗入牙本质小管之间的相关性（P<0.05）。
未观察到封闭剂渗入牙本质小管与根管充填物脱位所需力之间存在显著相关性（P=0.626）。
根据本研究结果，AH Plus封闭剂渗入牙本质小管的能力与根管充填物脱位所需力无关。
