J Dent Rehabil Appl Sci.  2019 Mar;35(1):20-26. 10.14368/jdras.2019.35.1.20.

Effect of adaptive movement on durability and working time of twisted file

• Lee SH
• Park SR
• Cho KM
• Park SH
• Kim JW

• KMID: 2450922
• DOI: http://doi.org/10.14368/jdras.2019.35.1.20

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 NiTi 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.

Keyword

NiTi file; twisted file; adaptive movement; unwinding

MeSH Terms

Filing
Movement
Root Canal Preparation

Figure

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  Fig. 1 Artificial canal completed with coronal preflaring and glide path preparation.

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  Fig. 2 TF instrument showing unwinding.

Reference

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