Possibility of Bypassing Three Fractured Rotary NiTi Files and Its Correlation with the Degree of Root Canal Curvature and Location of the Fractured File: An In Vitro Study

Esmaeil  Arshadifar; Hasan  Shahabinejad; Rahim  Fereidooni; Arash Shahravan; Homa  Kamyabi

doi:10.22037/iej.v17i2.33922

Iranian Endodontic Journal

Spring 2022
Vol. 17 No. 2 (2022)

Possibility of Bypassing Three Fractured Rotary NiTi Files and Its Correlation with the Degree of Root Canal Curvature and Location of the Fractured File: An In Vitro Study

Iranian Endodontic Journal, Vol. 17 No. 2 (2022), , Page 62-66
https://doi.org/10.22037/iej.v17i2.33922 Published 16 March 2022

Abstract

Introduction: This study aimed to evaluate the success rate of bypassing three NiTi rotary files (RaCe^®, Hero 642^®, and K3^®), fractured in various root canal locations of extracted mandibular molars with two different canal curvatures. Materials and Methods: Ninety freshly extracted human first or second mandibular molars were selected. Three millimeters of the file tip (RaCe^®, Hero 642^®, and K3^®), was fractured intentionally in the mesiobuccal root canal of each tooth by weakening the file in the last 3 mm of files #30 with 4% taper and preparing the root canals with two different degrees of curvature (n=30). Then, bypass possibility of the fractured files was evaluated using #8, #10, and #15 K-files and compared in different groups. In addition, the rate of accidental procedural errors was compared between these groups. Data were analyzed with univariate analysis and logistic regression models at a significance level of 0.05. Results: The overall success rate of bypassing was 61.1%. RaCe^® files had the highest and the K3^® files had the lowest bypass possibility rates (P=0.01); the greater the degree of canal curvature, the less successful the bypass procedure (P=0.01). The fracture of the files used to bypass was the most prevalent error. Conclusion: Based on this in vitro study the type of fractured file and the amount of canal curvature affected the success rate of the bypassing technique. In RaCe^® files and the mild curvature group, the success rate was the highest.

Keywords:

Bypass; Fractured File; Root Canal Preparation; Root Canal Treatment; Rotary Instruments

How to Cite

Arshadifar , E., Shahabinejad, H., Fereidooni , R., Shahravan, A., & Kamyabi , H. (2022). Possibility of Bypassing Three Fractured Rotary NiTi Files and Its Correlation with the Degree of Root Canal Curvature and Location of the Fractured File: An In Vitro Study. Iranian Endodontic Journal, 17(2), 62-66. https://doi.org/10.22037/iej.v17i2.33922

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