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ORIGINAL ARTICLE
Year : 2020  |  Volume : 17  |  Issue : 4  |  Page : 287-292

The effect of tapered master gutta-percha cone on apical seal of straight and curved root canals prepared with nickel–titanium rotary files


1 Department of Endodontics, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
2 Department of Microbiology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Arak, Iran
3 Department of Endodontics, School of Dental Medicine, Arak University of Medical Sciences, Arak, Iran

Correspondence Address:
Dr. Forough Khodadadnejad
Department of Endodontics, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz
Iran
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1735-3327.292058

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Background: 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 in vitro 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. Materials and Methods: In this in vitro study total of 130 mandibular molars were selected and divided into six experimental groups (n = 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. P < 0.05 was considered statistically significant. Results: 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 (P < 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 (P > 0.05). Conclusion: 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.


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