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KMID : 1004520190350010020
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Journal of Dental Rehabilitation and Applied Science
2019 Volume.35 No. 1 p.20 ~ p.26
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Effect of adaptive movement on durability and working time of twisted file
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Lee Sang-Ho
Park So-Ra
Cho Kyung-Mo
Park Se-Hee
Kim Jin-Woo
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Abstract
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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.
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KEYWORD
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NiTi file, twisted file, adaptive movement, unwinding
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