The influence of heat treatment on the mechanical properties of Ni-Ti file materials

作者：Miyara Kana; Yahata Yoshio; Hayashi Yohsuke; Tsutsumi Yusuke; Ebihara Arata^*; Hanawa Takao; Suda Hideaki

来源：Dental Materials Journal, 2014, 33(1): 27-31.

DOI：10.4012/dmj.2013-196

• Bending property
• Cyclic fatigue property
• Heat treatment
• Ni-Ti alloy
• Transformation behavior

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 empty set) 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 degrees C. Non-heated specimens were used as controls. DSC, a cantilever-bending test and cyclic fatigue test were performed. M-s and A(f) for groups 400 and 450 were higher than those for others (p%26lt;0.05). The load/deflection ratios of groups 400, 450 and 500 were lower than that of group 600 (p%26lt;0.05). The bending load values at 2.0-mm deflection of groups 400, 450 and 500 were lower than those of group 300 and the control group (p%26lt;0.05). The NCFs of groups 400, 450 and 500 exceeded that of group 600(p%26lt;0.05). Changes in flexibility with heat treatment could improve the cyclic fatigue properties of Ni-Ti instruments.

• 出版日期2014-2