Comparative Assessment of Canal Transportation and Centering Ratio of Three Heat Treated Rotary Systems in Severely curved simulated resin block (An in vitro study)
Author(s): Shareef Radhi Jawad* and Shatha Abdul Kareem
Objectives: The purpose of this study was to measure and compare the canal transportation and centering ratio at different levels of simulated curved canals of the endodontic resin blocks, which were prepared by using of three diverse thermally, treated nickel titanium rotary systems: Edge file X7 one curve and 2 shape. Forty five simulated curved canals of 40? curvature were randomly distributed into three groups of fifteen canals; each canal was prepared to an apical size of 25. Transportation measurements were taken at three different levels, correspondingly (pre and post) operative images of the simulated canals were taken in a standardized technique using USB stereomicroscope to gain the images, under magnification of 30 X. Image arrangements was done using photoshop CS 2019. Moreover, an evaluation of canal shape was determined using digimizer image analysis software under magnification of 300 Xe. After earning the data of canal transportation centering ratio, then statistical analyses by means of Shapiro-Wilk, ANOVA with post hoc tukey?s test were performed. Results showed that one curve group revealed significantly lower amount of canal transportation and better centering ability, followed by edge file X7 and finally 2 shapes. It was concluded that all of the groups that were used in this study formed variable degrees of canal transportation and no group of these systems showed zero centering ratios; likewise,files which have control memory feature showed the least amount of transportation and the best centering ratios.