Jafarzadeh Mansour, Yazdizadeh Mohammad, Sheikh Ahmad Farajzadeh, Hosseini Goosheh Seyed Mohsen, Khodadadnejad Forough, Rohani Ali
Department of Endodontics, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
Department of Microbiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Arak, Iran.
Dent Res J (Isfahan). 2020 Aug 14;17(4):287-292. eCollection 2020 Jul-Aug.
Gutta-percha has been the predominant root canal filling material which is developed with different taper. Canal obturation fixed with nickel-titanium (NiTi) instruments and tapered gutta-percha master cone and lateral condensation is advantageous because it is clinically effectual and appears to result in a radiographically acceptable outcome. The aim of this study was to determine the effect of tapered master gutta-percha cone on apical seal of straight and curved root canals using NiTi rotary files.
In this study total of 130 mandibular molars were selected and divided into six experimental groups ( = 20) based on the degree of root canal curvatures (0°-20°and 20°-40°) and the taper of master cones (0.02, 0.04, and 0.06). The roots were immersed in the bacterial leakage model and monitored daily for a period of 70 days. Data were analyzed using Kaplan-Meier approach, log-rank test, and Chi-square tests. < 0.05 was considered statistically significant.
The microleakage in the 0°-20° canal curvature using 0.02- and 0.04-tapered master cones was similar and considerably <0.06-tapered master cone ( < 0.05). However, the microleakage in the 20°-40° canal curvature using 0.02- and 0.04-tapered master cones was more than 0°-20° and for 0.06-tapered master cone was <0°-20°, but there was no statistical difference between the use of 0.02-, 0.04-, and 0.06-tapered master cones ( > 0.05).
The lateral condensation filling technique using 0.02- and 0.04-tapered master cones is more effective in minimizing microbial leakage in straight canals than 0.06-tapered master cone.
牙胶一直是主要的根管充填材料，有不同的锥度。使用镍钛（NiTi）器械、锥形牙胶主尖和侧向加压法进行根管充填是有利的，因为它在临床上有效，并且在影像学上似乎能获得可接受的结果。本研究的目的是确定使用NiTi旋转锉时，锥形牙胶主尖对直根管和弯曲根管根尖封闭的影响。
本研究共选取130颗下颌磨牙，根据根管弯曲程度（0°-20°和20°-40°）和主尖锥度（0.02、0.04和0.06）分为六个实验组（每组n = 20）。将牙根浸入细菌渗漏模型中，每天监测70天。使用Kaplan-Meier方法、对数秩检验和卡方检验分析数据。P < 0.05被认为具有统计学意义。
在0°-20°根管弯曲度下，使用0.02锥度和0.04锥度主尖的微渗漏情况相似，且明显低于0.06锥度主尖（P < 0.05）。然而，在20°-40°根管弯曲度下，使用0.02锥度和0.04锥度主尖的微渗漏多于0°-20°，使用0.06锥度主尖的微渗漏低于0°-20°，但使用0.02、0.04和0.06锥度主尖之间无统计学差异（P > 0.05）。
与0.06锥度主尖相比，使用0.02锥度和0.04锥度主尖的侧向加压充填技术在减少直根管微生物渗漏方面更有效。
