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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

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 firs...

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Detalles Bibliográficos
Autores principales: Arshadifar, Esmaeil, Shahabinejad, Hasan, Fereidooni, Rahim, Shahravan, Arash, Kamyabi, Homa
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Iranian Center for Endodontic Research 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9868980/
https://www.ncbi.nlm.nih.gov/pubmed/36704020
http://dx.doi.org/10.22037/iej.v17i2.33922
Descripción
Sumario: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.