Deflecting load of nickel titanium rotary instruments during cyclic fatigue

Ahmed Jamleh, Chihiro Kobayashi, Yoshio Yahata, Arata Ebihara, Hideaki Suda

研究成果: Article査読

11 被引用数 (Scopus)

抄録

The dispersion of the lifetime of NiTi instruments, and their deflecting load (DL) changes during cyclic fatigue were investigated. A total of 120 ProFile NiTi rotary instruments were tested using a specially designed cyclic fatigue testing apparatus with three pins. Using these pins, the instrument was bent and rotated at 300 rpm to fracture. DL was recorded using a load cell attached to the central pin. For each sample, the working time was converted to number of cycles to fracture (NCF) and the mean DL (DLm) was calculated. The averages of NCF and DLm of 120 samples were 584.3±180.5 cycles and 6.44±0.91 N, respectively. All samples showed a sequential decrease in DL during rotation. Based on the present study, it is impossible to estimate the lifetime of a NiTi instrument from NCF. Thus, the change in DL could be an alternative criterion to determine the remaining lifetime.

本文言語English
ページ(範囲)389-393
ページ数5
ジャーナルDental materials journal
31
3
DOI
出版ステータスPublished - 2012
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 歯科学(全般)

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