Moradi Saeed, Disfani Reza, Baziar Hani, Daneshvar Farzaneh, Jafarzadeh Hamid
Dental Material Research Center, Department of Endodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
J Oral Sci. 2013;55(2):93-8. doi: 10.2334/josnusd.55.93.
The apical third of most root canals shows some degree of curvature, which is important in cleaning/shaping and obturation during root canal treatment. The present study evaluated the effect of master cone size on the apical seal of severely curved root canals. Thirty-eight mesial roots of human mandibular first molars were prepared using the crown-down technique. All samples were mature roots with closed apices, had no carious lesions or resorption, and had a canal curvature of > 45º to 60º. Two samples were used as a negative and positive control to evaluate the fluid filtration equipment, and the remaining 36 samples were equally divided into groups A, B, and C based on master cone size, namely, gutta-percha #20, #25, and #30, respectively. The fluid filtration method was used to evaluate microleakage. No significant difference in microleakage was observed among groups (P = 0.31). In conclusion, an increase in master cone size up to #30 does not significantly influence apical microleakage.
大多数根管的根尖三分之一显示出一定程度的弯曲，这在根管治疗期间的清理/塑形和充填过程中很重要。本研究评估了主尖锉尺寸对严重弯曲根管根尖封闭的影响。使用冠向下技术预备38颗人下颌第一磨牙的近中根。所有样本均为根尖封闭的成熟牙根，无龋损或吸收，根管弯曲度>45°至60°。使用两个样本作为阴性和阳性对照来评估液体过滤设备，其余36个样本根据主尖锉尺寸平均分为A、B和C组，分别为牙胶尖#20、#25和#30。采用液体过滤法评估微渗漏。各组间微渗漏未见显著差异（P = 0.00）。总之，主尖锉尺寸增加至#30不会显著影响根尖微渗漏。
