Paper Title:
Comparison between the Flexibility of Three Different Types of Rotary NiTi Endodontic Instruments
  Abstract

The aim of this study was to characterize metallurgical properties and the dimensions of three types of rotary NiTi endodontic instruments and to establish a correlation between these characteristics and the flexibility of the instruments. Their chemical composition and constitution were characterized by energy dispersive spectroscopy (EDX) and X-ray diffraction (XRD). Transformation temperatures were assessed by means of differential scanning calorimetry (DSC). Computer software was used to analyse images of the longitudinal and transverse sections for determining instrument diameter and cross-sectional area at 3mm from the tip. The flexibility of the instruments was evaluated in bending tests performed according to the ISO 3630-1 specification, in which the instruments are clamped at 3mm from their tip and bent by 45° along their longitudinal axis. The values of bending moment at 45° were correlated with instrument diameter and cross-sectional area at 3mm from the tip. The results of EDX, XRD and DSC showed that physical and chemical properties of the materials differed slightly among the files analyzed. A direct relationship was found between bending moment and the geometric characteristics of the instruments. Resistance to bending of NiTi root canal instruments depended on their geometrical shapes and metallurgical properties, but the cross-sectional configuration can be seen as an important parameter affecting this property.

  Info
Periodical
Edited by
Rodinei M. Gomes, Silvio de Barros, Sandro M. Torres, Severino Jackson G. de Lima, Tadeu A. A. Melo, Vicente T. Lopes Buono
Pages
61-68
DOI
10.4028/www.scientific.net/MSF.643.61
Citation
A. C. D. Viana, M. G. de A. Bahia, V. T. L. Buono, "Comparison between the Flexibility of Three Different Types of Rotary NiTi Endodontic Instruments", Materials Science Forum, Vol. 643, pp. 61-68, 2010
Online since
March 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Hui Min Zhou, Qing Fen Li, Yu Feng Zheng, Li Li
Abstract:Nickel-titanium alloy are extensively used in engineering and biomedical fields for their excellent properties of shape-memory,...
77
Authors: Renata de Castro Martins, Maria Guiomar de Azevedo Bahia, Vicente Tadeu Lopes Buono
Abstract:This study evaluated the influence of cyclic straining in torsion on fatigue resistance and torsional properties of ProTaper (S1, S2, F1, F2,...
79
Authors: Vincent Legrand, Sylvain Moyne, Laurent Pino, Shabnam Arbab Chirani, Sylvain Calloch, Reza Arbab Chirani, Valerie Chevalier
Chapter 11: Medical Applications
Abstract:Superelastic NiTi SMA is the base of endodontic files. The flexibility of these instruments permits the preparation of root canals....
549
Authors: Chun Tung Wu, C.Y. Chung
Chapter 2: Biological and Medical Materials, Technologies and Engineering
Abstract:This study examined RNEF with scanning electron microscope (SEM), for surface flaws, internal voids and inclusions. Six commercial brands of...
262
Authors: Chow Shing Shin, Q.M. Chang, Chun Pin Lin
Chapter 2: Mechanical Engineering
Abstract:Cyclic fatigue of rotary endodontic instruments has been tested using different techniques while the results were normally compared in terms...
82