You Position: Home > Paper

Metallurgic behavior and mechanical property of nickel-titanium endodontic files made by 3 heat treatment techniques

( views:0, downloads:0 )
No author available
Journal Title:
Chinese Journal of Stomatology
Key Word:
根管制备;相变;镍钛根管锉;弯曲性能;疲劳折断性能;Root canal preparation;Phase transition;Nickel-titanium file;Bending property;Cyclic fatigue

Abstract´╝Ü Objective To compare the phase transformation behavior,bending property and cyclic fatigue resistance of CM-wire,R-phase and M-wire nickel-titanium endodontic files treated by 3 heat treatment techniques.Methods Hyflex CM (25 mm,25#/0.06) made from CM wire,TF (25 mm,25#/0.06) made from R-phase heat treatment,ProTaper Next X2 (25 mm,tip size 25#/0.06) made from M-wire,Mtwo (25 mm,25#/0.06) and ProTaper F2 (25 mm,tip size 25#/0.08) made from conventional nickel-titanium wire were chosen.Five of each files were chosen for differential scanning calorimetric (DSC) evaluation (n=5).The specimens were prepared from adjacent portions of the shaft.The weight and length were typically (20± 1) mg and 2-3 mm.Another eight of the 5 nickel-titanium files were undergone cantilever-bending test,respectively (n=8).Further ten of the 5 instruments were submitted to the cyclic fatigue test by using a simulated metal root canal (n=10).The data of Ms,Mf,As,Af,△H,bending load,number of cyclic fatigue (NCF),fragment length were analyzed using one-way analysis of variance at a significance level of P<0.05.Results The Af of Hyflex CM [(60.27±0.94) ℃] and ProTaper Next [(51.40±0.32) ℃] were higher than body temperature of 37 ℃.The bending load values at 3.0 mm deflection of Hyflex CM [(0.867±0.074) N],TF [(1.275±0.146) N],Mtwo [(2.281±0.426) N],ProTaper Next [(3.104±0.252) N] and ProTaper [(4.227± 0.483) N] increased gradually and significantly.The NCF of Hyflex CM (582±99),TF (427±85),ProTaper Next (158 ± 22),Mtwo (129 ± 32) and ProTaper (65 ± 20) decreased gradually.Conclusions The 3 heat treatment techniques exert tremendous influence on the phase transformation behavior and mechanical characteristics of the files,which demonstrate improved bending property and cyclic fatigue resistance than the conventional ones.

WanfangData CO.,Ltd All Rights Reserved
About WanfangData | Contact US
Healthcare Department, Fuxing Road NO.15, Haidian District Beijing, 100038 P.R.China
Tel:+86-010-58882616 Fax:+86-010-58882615