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Minerva Stomatologica 2008 September;57(9):393-8

Copyright © 2008 EDIZIONI MINERVA MEDICA

language: English, Italian

Bending properties of nickel-titanium instruments: a comparative study

Gambarini G. 1, Pongione G. 1, Rizzo F. 1, Testarelli L. 1, Cavalleri G. 2, Gerosa R. 2

1 Department of Dental Sciences La Sapienza University, Rome, Italy 2 Department of Dental Sciences University of Verona, Verona, Italy


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Aim. The aim of the present study was to evaluate the bending properties of twisted file instruments, and compare them with other commercially available nickel-titanium (NiTi) instruments (Mtwo and Hero) manufactured with traditional methods.
Methods. Despite NiTi superelastic properties, flexibility of NiTi instruments is limited by size and taper. A new manufacturing process involving twisting of a ground blank combined with heat treatment has been developed by SybronEndo, aiming to produce a NiTI rotary file with superior flexibility: the Twisted File (TF). Experimental procedures strictly followed the testing methodology described in ISO 3630-1. Bending moment was measured when the instrument attained a 45° bend. Data were collected and statistically analyzed.
Results. Results showed that TF were the most flexibile instruments, with a significant improvement in flexibility (P< 0.05). ranging from 100% to 250% over the other tested instruments. Even if flexibility is also influenced by instruments design, such a great improvement is mainly related to the new TF manufacturing process.
Conclusion. The flexibility is influenced by instruments design, such a great improvement is mainly related to the new manufacturing process developed by SybronEndo, which seems to play a major role in increasing the flexibility of TF instruments.

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