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- Title
Torque Range, a New Parameter to Evaluate New and Used Instrument Safety.
- Authors
Di Nardo, Dario; Seracchiani, Marco; Mazzoni, Alessandro; Del Giudice, Andrea; Gambarini, Gianluca; Testarelli, Luca
- Abstract
Featured Application: Torque Range should be considered a crucial parameter for describing instrument safety and could ensure treatments in a more efficient way. The aim of the present study is to evaluate operative torque, torque at failure and the difference between these two values—the "torque range"—of two different NiTi files. We also sought to evaluate and compare these parameters for new and used files. Forty S-One 20.06 and forty M-Two 20.06 were tested, divided in four equal groups (n = 10) for each brand. Ten instruments from each brand performed three root canal treatments each on standardized extracted single-rooted teeth. Afterwards, each group was subjected to the following two tests: operative torque and torsional resistance. Mean values for all the tested groups were calculated. The results for new instruments showed that S-One developed significantly higher operative torque, but higher torsional resistance. The results for used instruments showed that the S-One 20.06 developed less operative torque and higher mean torsional resistance value compared to the M-Two. Moreover, the percentage reduction of both values was significantly higher for M-Two. The results of the present study showed a safer torsional behavior of the S-One. These results could be related to the heat treatment and the manufacturing process.
- Subjects
CYCLIC fatigue; GUTTA-percha; TORQUE; ISOKINETIC exercise; ROOT canal treatment; MANUFACTURING processes; HEAT treatment; FILES (Records)
- Publication
Applied Sciences (2076-3417), 2020, Vol 10, Issue 10, p3418
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app10103418