TY - JOUR
T1 - Effect of heat treatments on Ni-Ti endodontic files
AU - Fernandes, F. M. Braz
AU - Alves, A. R.
AU - Machado, A.
AU - Oliveira, J. P.
N1 - Funding by FCT/MEC through PEst-C/CTM/LA0025-2013-14- Strategic Project - LA 25 - 2013-2014 and the Project NiTi-Fail (PTDC/EME-PME/122795/2011) is acknowledged. JPO acknowledges FCT/MCTES for funding PhD grant SFRH/BD/85047/2012.
PY - 2017
Y1 - 2017
N2 - Three brands of rotary nickel-titanium endodontic instruments with some comparable geometric features but with different crosssection (similar tip size and same taper of.04) were selected for this study: MTwo.04(35) (VDW GmbH, Germany), K3.04(30) (SybronEndo, Mexico) and K3XF.04(30) (SybronEndo, Mexico). K3XF is made from novel R-phase heat-treated metal alloy while all other files were made from traditional Ni-Ti alloy. The instruments were analysed under the following conditions: i) as received (AR), ii) heat treated at 350 degrees C, iii) heat treated at 400 degrees C. The transformation temperatures were determined by differential scanning calorimeter (DSC). Compared to conventionally K3 and MTwo files, R-phase heat treatment K3XF file showed higher transformation temperatures. These results also showed that heat treatments increase the transformation temperatures. (C) 2017 Portuguese Society of Materials (SPM). Published by Elsevier Espana, S.L.U. All rights reserved.
AB - Three brands of rotary nickel-titanium endodontic instruments with some comparable geometric features but with different crosssection (similar tip size and same taper of.04) were selected for this study: MTwo.04(35) (VDW GmbH, Germany), K3.04(30) (SybronEndo, Mexico) and K3XF.04(30) (SybronEndo, Mexico). K3XF is made from novel R-phase heat-treated metal alloy while all other files were made from traditional Ni-Ti alloy. The instruments were analysed under the following conditions: i) as received (AR), ii) heat treated at 350 degrees C, iii) heat treated at 400 degrees C. The transformation temperatures were determined by differential scanning calorimeter (DSC). Compared to conventionally K3 and MTwo files, R-phase heat treatment K3XF file showed higher transformation temperatures. These results also showed that heat treatments increase the transformation temperatures. (C) 2017 Portuguese Society of Materials (SPM). Published by Elsevier Espana, S.L.U. All rights reserved.
KW - NiTi shape memory alloys
KW - endodontic files
KW - heat treatments
KW - transformation temperatures
U2 - 10.1016/j.ctmat.2016.07.012
DO - 10.1016/j.ctmat.2016.07.012
M3 - Article
SN - 0870-8312
VL - 29
SP - E15-E18
JO - Ciência & Tecnologia dos Materiais
JF - Ciência & Tecnologia dos Materiais
IS - 1
ER -