Effect of Nitrogen Ion Implantation on the Flexibility of Rotary Nickel-Titanium Instruments
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
07/11/2013
07/11/2013
2012
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Resumo |
Introduction: 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 degrees 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 x 10(17) ions/cm(2), voltage 200 KeV, current density 1 mu A/cm(2), temperature 130 degrees C, and vacuum conditions of 10 x 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 degrees. 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 degrees 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. (J Endod 2012;38:673-675) |
Identificador |
JOURNAL OF ENDODONTICS, NEW YORK, v. 38, n. 5, pp. 673-675, MAY, 2012 0099-2399 http://www.producao.usp.br/handle/BDPI/43100 10.1016/j.joen.2012.01.012 |
Idioma(s) |
eng |
Publicador |
ELSEVIER SCIENCE INC NEW YORK |
Relação |
JOURNAL OF ENDODONTICS |
Direitos |
closedAccess Copyright ELSEVIER SCIENCE INC |
Palavras-Chave | #FLEXIBILITY #ION IMPLANTATION #NICKEL-TITANIUM #ROTARY FILES #SCANNING-ELECTRON-MICROSCOPY #ENDODONTIC INSTRUMENTS #CUTTING EFFICIENCY #CYCLIC FATIGUE #SURFACE TREATMENTS #CLINICAL-USE #FILES #WEAR #RESISTANCE #DEFECTS #DENTISTRY, ORAL SURGERY & MEDICINE |
Tipo |
article original article publishedVersion |