An initial investigation on torsional properties of nickel‐titanium instruments produced with a new manufacturing method
- 17 August 2009
- journal article
- research article
- Published by Wiley in Australian Endodontic Journal
- Vol. 35 (2), 70-72
- https://doi.org/10.1111/j.1747-4477.2008.00129.x
Abstract
A new manufacturing process involving twisting of a ground blank combined with heat treatment has been recently developed to produce nickel-titanium rotary files for root canal preparation. The aim of this study was to compare torsional resistance of prototype instruments produced using the new manufacturing method versus traditional nickel-titanium instruments produced by the customary grinding process. Twenty prototypes instruments of the same design and dimensions were divided in two groups of 10 each, according to the different manufacturing method. A file-testing apparatus specifically designed to perform torsional testing was used in accordance with the International Organization for Standardization 3630-1. The results indicated that instruments manufactured by the new manufacturing process demonstrated significantly higher average maximum torque levels than those manufactured by the existing grinding process (P < 0.05). Since instruments design and dimensions of the instruments were the same, the different manufacturing process could be the only explanation for this improvement in torsional resistance.Keywords
This publication has 9 references indexed in Scilit:
- Fracture Resistance of Electropolished Rotary Nickel–Titanium Endodontic InstrumentsJournal of Endodontics, 2007
- Phase transformation behaviour and bending properties of hybrid nickel–titanium rotary endodontic instrumentsInternational Endodontic Journal, 2007
- Comparative Study of Torsional and Bending Properties for Six Models of Nickel-Titanium Root Canal Instruments with Different Cross-SectionsJournal of Endodontics, 2006
- The K3 rotary nickel titanium instrument systemEndodontic Topics, 2005
- Proposed Role of Embedded Dentin Chips for the Clinical Failure of Nickel-Titanium Rotary InstrumentsJournal of Endodontics, 2004
- Cyclic fatigue of ProFile rotary instruments after prolonged clinical useInternational Endodontic Journal, 2001
- A comparison of stainless steel and nickel-titanium H-type instruments of identical design: Torsional and bending testsOral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2000
- Defects in Rotary Nickel-Titanium Files After Clinical UseJournal of Endodontics, 2000
- An initial investigation of the bending and torsional properties of nitinol root canal filesJournal of Endodontics, 1988