Comparison of Canal Transportation and Centring Ability of RaCe, and AF f-one rotary instruments by cone-beam computed tomography

Abstract

Introduction Today, rotary files have come a long way to improve canal preparation. These devices are able to maintain both the morphological characteristics and the safety of the channel formation. The aim of this study was to compare the amount of displacement and the preservation of the centrality of the canal in Race and Af f-one rotary files by cone beam computed tomography. materials and methods In this laboratory study, 36 mandibular molar teeth were selected. The amount of curvature of the roots was determined from the radiographic stereotype for apical and using AutoCad 2007 software, and the teeth with a curvature of 22-40 degrees and a radius of curvature of 5.5-9.9 mm were selected for preparation. The access cavity was drilled to define the mesiobuccal canals of the teeth by a diamond bur with a long-end handpiece using water and air spray. To determine the working length of the mesiobuccal canal, a number 10 k-file was searched until the tip of the file was seen from the end of the apex, and the working length was determined and recorded 1 mm less than the obtained length. A silicone molding material was used to simulate the periodontal ligament space, and in order to prevent the silicone material from entering the apical foramen, the area was sealed with rose wax. Then the samples were placed in the hypotiwash block up to the CEJ. All teeth were scanned by CBCT machine. The length of all samples was reduced to 18 mm by cutting the crown, and the samples were randomly divided into 2 groups of 18 including group 1: RaCe, group 2: AF f-one and numbered, mounted in a potty laboratory. Samples were prepared with relevant files. At the end, after the preparation of the canal with the size of 25 and 40 in each group, CBCT examination was performed. The amount of transport and preservation of centrality was calculated and the data were compared using SPSS version 24 software and ANOVA and t-test statistical tests. Results In each of the Race and Af f-one systems, the degree of preservation of canal centrality and transportation was similar in coronal, middle and apical sections. Also, the degree of preservation of canal centrality and transportation was similar in two types of Race and Af f-one rotary files, this similarity was observed in all three coronal, middle and apical sections. Conclusion There is no significant difference between different rotary canal preparation systems in terms of the amount of transportation and maintenance of centrality in the apical, middle and coronal regions.