Effect of Nitrogen Ion Implantation on the Flexibility of Rotary Nickel-Titanium Instruments

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• 作者：Marcelo dos Santos ; PhD ; Giulio Gavini ; PhD ; Evandro Luiz Siqueira ; PhD ; ^{pels@usp.br" class="auth_mail" title="E-mail the corresponding author} ; Cristiane da Costa ; PhD
• 关键词：Flexibility ; ion implantation ; nickel-titanium ; rotary files
• 刊名：Journal of Endodontics
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：38
• 期：5
• 页码：673-675
• 全文大小：195 K

文摘

The aim of this study was to assess the effect of nitrogen ion implantation on the flexibility of rotary nickel-titanium (NiTi) instruments as measured by the load required to bend implanted and nonimplanted instruments at a 30° angle.

Methods

Thirty K3 files, size #40, 0.02 taper and 25-mm length, were allocated into 2 groups as follows: group A, 15 files exposed to nitrogen ion implantation at a dose of 2.5 × 10¹⁷ ions/cm², voltage 200 KeV, current density 1 μA/cm², temperature 130°C, and vacuum conditions of 10 × 10⁻⁶ mm Hg for 6 hours; and group B, 15 nonimplanted files. One extra file was used for process control. All instruments were subjected to bend testing on a modified troptometer, with measurement of the load required for flexure to an angle of 30°. The Mann-Whitney U test was used for statistical analysis. Findings with P <.05 were considered significant.

Results

The mean load required to bend instruments at a 30° angle was 376.26 g for implanted instruments and 383.78 g for nonimplanted instruments. The difference was not statistically significant.

Conclusions

Our findings show that nitrogen ion implantation has no appreciable effect on the flexibility of NiTi instruments.