Comparative Evaluation of the Shaping Ability of Three Rotary Systems in Primary Molars: In Vitro Study

Abstract

Aim: This in-vitro study aimed to evaluate the shaping ability of hand K files, Kedo S, Hyflex, and the Race evo rotary files when used in the biomechanical preparation of primary molars by using CBCT. Materials and methods:One hundred forty extracted human primary mandibular second molars were randomly allocated into 4 groups of 35 each. Group A: Prepared with stainless steel hand files (MANI, Inc.; Tochigi, Japan), group B: Prepared with Kedo S plus pediatric rotary files (Chennai, Tamil Nadu, India), group C: Prepared with Hyflex cm (Colten-Whaledent) rotary files and group D: Prepared with Race Evo (FKG Dentaire SA, La Chaux de Fonds, Switzerland) rotary files. Before starting any procedure, all the samples were scanned using cone-beam CT (Gendex -GXDP-800, Kavo, Dental Charlotte United States). Pre-operative measurements were performed at 3 points at the middle one third of the distal root canals of the primary molars. Postoperative scans were obtained similar to a preoperative manner. The root canal thickness measurements were made at the same level of the preoperative readings.Results: Comparisons were made between the study groups' means. Data were compared using One Way ANOVA test followed by Tukey's Post Hoc test. The findings revealed no significant difference between any of the groups. Conclusion:No differences were noted concerning the shaping ability of the rotary systems used. Thus, all these systems could be used in instrumentation of primary molars.

Cone-beam computed tomography evaluation of shaping ability of kedo-S square and fanta AF™ baby rotary files compared to manual K-files in root canal preparation of primary anterior teeth

“…The present study findings partially rejected the null hypothesis as there was a highly significant statistical difference regards the removed dentin amount on both mesial & distal sides between the three groups at the cervical & apical thirds, whereas a non-significant difference was observed at the middle third (null hypothesis was accepted). These results could be related to variations in the file design, the degree of root canal curvature, instrumentation procedures, and the number of files [ 28 ]. This was in contrast with Abd El-Fatah et al [ 10 ] study in which a non-significant statistical difference was found concerning the amount of dentin removed at the coronal & apical thirds among hand K-file, Fanta, and Zuanba groups while a significant difference was present at the middle third ( P = 0.043).…”