search for




 

Adaptive movement가 twisted file의 내구성과 작업 시간에 미치는 영향
Effect of adaptive movement on durability and working time of twisted file
J Dent Rehabil Appl Sci 2019;35(1):20-26
Published online March 30, 2019
© 2019 Korean Academy of Stomatognathic Function and Occlusion.

이상호, 박소라, 조경모, 박세희, 김진우*
Sang-Ho Lee, So-Ra Park, Kyung-Mo Cho, Se-Hee Park, Jin-Woo Kim*

강릉원주대학교 치과대학 치과보존학교실

Department of Conservative Dentistry, College of Dentistry, Gangneung-Wonju National University School of Dentistry, Gangneung, Republic of Korea
Jin-Woo Kim, Professor, Department of Conservative Dentistry, College of Dentistry, Gangneung-Wonju National University, 7, Jukheon-gil, Gangneung, 25457, Republic of Korea, Tel: +82-33-640-3189, Fax: +82-33-640-3103, E-mail: mendo7@gwnu.ac.kr
Received November 12, 2018; Revised February 25, 2019; Accepted March 3, 2019.
cc This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Purpose: Recently TF-adaptive movement is developed in order to increase the durability of TF files. The purpose of this study was to assess the effects of adaptive movement on durability and performance of twisted files. Materials and Methods: Resin blocks simulating artificial J-shape canals were used for this study. In TFC group, TF-adaptive ML-1 (25/.08 size) files were used to prepare the canals under continuous rotation 500 rpm/4.0 Ncm. In TFA group, TF-adaptive ML-1 (25/.08 size) files were used to prepare the canals under adaptive movement. After preparing each artificial canal, TF files were observed under dental microscope for assessing existence of unwinding, distortion, and fracture. If unwinding of flute was observed, the number of artificial canals until unwinding of flute occurs was recorded. Required time until instruments reach working length and distance of unwinded portion of files from D0 were measured. All test results were conducted by Mann-Whitney U test at a 0.05 level of significance. Results: No Ni-Ti instrument’s separation was observed. Number of resin blocks until file unwinding happens and working time was significantly high in TFA group compared to TF group. Distance of distortion from D0 didn’t show significant difference between TFA, TF groups. Conclusion: The number of resin blocks prepared until unwinding happens and working time were significantly high in TFA group. The location of unwinding showed no significant difference between 2 groups. Adaptive movement increased the number of canals prepared until unwinding occurs and working time of twisted files.
Keywords : NiTi file; twisted file; adaptive movement; unwinding


March 2019, 35 (1)