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

Kana Miyara, Yoshio Yahata, Yohsuke Hayashi, Yusuke Tsutsumi, Arata Ebihara, Takao Hanawa, Hideaki Suda

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)27-31
Number of pages5
JournalDental materials journal
Volume33
Issue number1
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Dentistry(all)

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