TY - JOUR
T1 - The influence of heat treatment on the mechanical properties of Ni-Ti file materials
AU - Miyara, Kana
AU - Yahata, Yoshio
AU - Hayashi, Yohsuke
AU - Tsutsumi, Yusuke
AU - Ebihara, Arata
AU - Hanawa, Takao
AU - Suda, Hideaki
PY - 2014
Y1 - 2014
N2 - The purpose of this study was to investigate the influence of heat treatment on the mechanical properties of Ni-Ti file materials. Ni-Ti wire (1.00 mm ø) was processed into a conical shape with 0.30-mm diameter tip and 0.06 taper. Specimens were heated for 30 min at 300, 400, 450, 500 or 600°C. Non-heated specimens were used as controls. DSC, a cantilever-bending test and cyclic fatigue test were performed. Ms and Af for groups 400 and 450 were higher than those for others (p<0.05). The load/defection ratios of groups 400, 450 and 500 were lower than that of group 600 (p<0.05). The bending load values at 2.0-mm defection of groups 400, 450 and 500 were lower than those of group 300 and the control group (p<0.05). The NCFs of groups 400, 450 and 500 exceeded that of group 600(p<0.05). Changes in flexibility with heat treatment could improve the cyclic fatigue properties of Ni-Ti instruments.
AB - The purpose of this study was to investigate the influence of heat treatment on the mechanical properties of Ni-Ti file materials. Ni-Ti wire (1.00 mm ø) was processed into a conical shape with 0.30-mm diameter tip and 0.06 taper. Specimens were heated for 30 min at 300, 400, 450, 500 or 600°C. Non-heated specimens were used as controls. DSC, a cantilever-bending test and cyclic fatigue test were performed. Ms and Af for groups 400 and 450 were higher than those for others (p<0.05). The load/defection ratios of groups 400, 450 and 500 were lower than that of group 600 (p<0.05). The bending load values at 2.0-mm defection of groups 400, 450 and 500 were lower than those of group 300 and the control group (p<0.05). The NCFs of groups 400, 450 and 500 exceeded that of group 600(p<0.05). Changes in flexibility with heat treatment could improve the cyclic fatigue properties of Ni-Ti instruments.
KW - Bending property
KW - Cyclic fatigue property
KW - Heat treatment
KW - Ni-Ti alloy
KW - Transformation behavior
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U2 - 10.4012/dmj.2013-196
DO - 10.4012/dmj.2013-196
M3 - Article
C2 - 24492108
AN - SCOPUS:84893515133
VL - 33
SP - 27
EP - 31
JO - Dental Materials Journal
JF - Dental Materials Journal
SN - 0287-4547
IS - 1
ER -