Phase transformation behaviour and bending property of twisted nickel-titanium endodontic instruments

X. M. Hou, Yoshio Yahata, Y. Hayashi, A. Ebihara, T. Hanawa, H. Suda

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Aim To investigate the relationship between phase transformation behaviour and bending property of nickel-titanium endodontic instruments manufactured by a twisting process. Methodology The phase transformation behaviour and bending property of Twisted Files (TF; SybronEndo, Orange, CA, USA) and K3 (SybronEndo) with.06 taper and size 30 tip were investigated. K3 was used as control group. Phase transformation behaviour was estimated by differential scanning calorimetry (DSC). Transformation temperatures were calculated from the DSC curve. Bending load of the instruments was measured by cantilever-bending test at 37°C. Data were analysed by Student's t-test and Mann-Whitney U-test. Results The phase transformation temperatures of TF were significantly higher (P<0.05) than those of K3. The bending load values were significantly lower for TF than that of K3 (P<0.05), both in the elastic and super-elastic ranges. Conclusions The new method of manufacturing NiTi instruments by twisting coupled with heat treatment might contribute to the increased phase transformation temperatures and superior flexibility.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalInternational Endodontic Journal
Volume44
Issue number3
DOIs
Publication statusPublished - 2011 Mar 1
Externally publishedYes

Keywords

  • Bending property
  • Differential scanning calorimetry
  • Manufacturing process
  • Nickel-titanium alloy
  • Twisted File

ASJC Scopus subject areas

  • Dentistry(all)

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