Chemical Analysis of Nickel-Titanium Rotary Instruments with and without Electropolishing after Cleaning Procedures with Sodium Hypochlorite

Antonio Bonaccorso, Edgar Schäfer, Guglielmo Guido Condorelli, Giuseppe Cantatore, Teresa Roberta Tripi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The aim of this study was to chemically analyze rotary nickel-titanium instruments with and without electropolishing after cleaning procedures with NaOCl. To evaluate the effect of 5.25% NaOCl on electropolished RaCe instruments, a total of 18 instruments were tested. A control group of 18 nonelectropolished RaCe instruments was used. The surface of each instrument was analyzed before and after cleaning in NaOCl by using energy dispersive x-ray analysis, Auger electron spectroscopy, and scanning electron microscopy. Surface defects were recorded, and a χ2 test was used for statistical analysis. After immersion in NaOCl, the nonelectropolished and electropolished files showed a significant increase of iron deposits as a result of galvanic corrosion of the shaft (P <.05). The nonelectropolished files showed marked presence of NaCl deposits in the machining marks and microcracks. As regards the chemical nature of the surface, the electropolished files had an oxide increase compared with the low oxide concentration (mainly TiO2) before cleaning. The nonelectropolished files already possessed higher oxides concentration (TiO2 and NiO) before NaOCl cleaning. NaOCl treatment affects the chemical composition of the surface and, in particular for nonelectropolished instruments, of the bulk exposed through machining marks and fabrication microcracks.

Original languageEnglish
Pages (from-to)1391-1395
Number of pages5
JournalJournal of Endodontics
Volume34
Issue number11
DOIs
Publication statusPublished - Nov 2008

Fingerprint

Sodium Hypochlorite
Oxides
Corrosion
Immersion
Electron Scanning Microscopy
Spectrum Analysis
Iron
X-Rays
Electrons
Control Groups
nitinol
Therapeutics

Keywords

  • Corrosion
  • micro-cracks
  • RaCe
  • sodium hypochlorite
  • surface defects

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Chemical Analysis of Nickel-Titanium Rotary Instruments with and without Electropolishing after Cleaning Procedures with Sodium Hypochlorite. / Bonaccorso, Antonio; Schäfer, Edgar; Condorelli, Guglielmo Guido; Cantatore, Giuseppe; Tripi, Teresa Roberta.

In: Journal of Endodontics, Vol. 34, No. 11, 11.2008, p. 1391-1395.

Research output: Contribution to journalArticle

Bonaccorso, Antonio ; Schäfer, Edgar ; Condorelli, Guglielmo Guido ; Cantatore, Giuseppe ; Tripi, Teresa Roberta. / Chemical Analysis of Nickel-Titanium Rotary Instruments with and without Electropolishing after Cleaning Procedures with Sodium Hypochlorite. In: Journal of Endodontics. 2008 ; Vol. 34, No. 11. pp. 1391-1395.
@article{0fcebda1e10c4b6e974d4d3e70a72954,
title = "Chemical Analysis of Nickel-Titanium Rotary Instruments with and without Electropolishing after Cleaning Procedures with Sodium Hypochlorite",
abstract = "The aim of this study was to chemically analyze rotary nickel-titanium instruments with and without electropolishing after cleaning procedures with NaOCl. To evaluate the effect of 5.25{\%} NaOCl on electropolished RaCe instruments, a total of 18 instruments were tested. A control group of 18 nonelectropolished RaCe instruments was used. The surface of each instrument was analyzed before and after cleaning in NaOCl by using energy dispersive x-ray analysis, Auger electron spectroscopy, and scanning electron microscopy. Surface defects were recorded, and a χ2 test was used for statistical analysis. After immersion in NaOCl, the nonelectropolished and electropolished files showed a significant increase of iron deposits as a result of galvanic corrosion of the shaft (P <.05). The nonelectropolished files showed marked presence of NaCl deposits in the machining marks and microcracks. As regards the chemical nature of the surface, the electropolished files had an oxide increase compared with the low oxide concentration (mainly TiO2) before cleaning. The nonelectropolished files already possessed higher oxides concentration (TiO2 and NiO) before NaOCl cleaning. NaOCl treatment affects the chemical composition of the surface and, in particular for nonelectropolished instruments, of the bulk exposed through machining marks and fabrication microcracks.",
keywords = "Corrosion, micro-cracks, RaCe, sodium hypochlorite, surface defects",
author = "Antonio Bonaccorso and Edgar Sch{\"a}fer and Condorelli, {Guglielmo Guido} and Giuseppe Cantatore and Tripi, {Teresa Roberta}",
year = "2008",
month = "11",
doi = "10.1016/j.joen.2008.08.004",
language = "English",
volume = "34",
pages = "1391--1395",
journal = "Journal of Endodontics",
issn = "0099-2399",
publisher = "Elsevier Inc.",
number = "11",

}

TY - JOUR

T1 - Chemical Analysis of Nickel-Titanium Rotary Instruments with and without Electropolishing after Cleaning Procedures with Sodium Hypochlorite

AU - Bonaccorso, Antonio

AU - Schäfer, Edgar

AU - Condorelli, Guglielmo Guido

AU - Cantatore, Giuseppe

AU - Tripi, Teresa Roberta

PY - 2008/11

Y1 - 2008/11

N2 - The aim of this study was to chemically analyze rotary nickel-titanium instruments with and without electropolishing after cleaning procedures with NaOCl. To evaluate the effect of 5.25% NaOCl on electropolished RaCe instruments, a total of 18 instruments were tested. A control group of 18 nonelectropolished RaCe instruments was used. The surface of each instrument was analyzed before and after cleaning in NaOCl by using energy dispersive x-ray analysis, Auger electron spectroscopy, and scanning electron microscopy. Surface defects were recorded, and a χ2 test was used for statistical analysis. After immersion in NaOCl, the nonelectropolished and electropolished files showed a significant increase of iron deposits as a result of galvanic corrosion of the shaft (P <.05). The nonelectropolished files showed marked presence of NaCl deposits in the machining marks and microcracks. As regards the chemical nature of the surface, the electropolished files had an oxide increase compared with the low oxide concentration (mainly TiO2) before cleaning. The nonelectropolished files already possessed higher oxides concentration (TiO2 and NiO) before NaOCl cleaning. NaOCl treatment affects the chemical composition of the surface and, in particular for nonelectropolished instruments, of the bulk exposed through machining marks and fabrication microcracks.

AB - The aim of this study was to chemically analyze rotary nickel-titanium instruments with and without electropolishing after cleaning procedures with NaOCl. To evaluate the effect of 5.25% NaOCl on electropolished RaCe instruments, a total of 18 instruments were tested. A control group of 18 nonelectropolished RaCe instruments was used. The surface of each instrument was analyzed before and after cleaning in NaOCl by using energy dispersive x-ray analysis, Auger electron spectroscopy, and scanning electron microscopy. Surface defects were recorded, and a χ2 test was used for statistical analysis. After immersion in NaOCl, the nonelectropolished and electropolished files showed a significant increase of iron deposits as a result of galvanic corrosion of the shaft (P <.05). The nonelectropolished files showed marked presence of NaCl deposits in the machining marks and microcracks. As regards the chemical nature of the surface, the electropolished files had an oxide increase compared with the low oxide concentration (mainly TiO2) before cleaning. The nonelectropolished files already possessed higher oxides concentration (TiO2 and NiO) before NaOCl cleaning. NaOCl treatment affects the chemical composition of the surface and, in particular for nonelectropolished instruments, of the bulk exposed through machining marks and fabrication microcracks.

KW - Corrosion

KW - micro-cracks

KW - RaCe

KW - sodium hypochlorite

KW - surface defects

UR - http://www.scopus.com/inward/record.url?scp=53549124103&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=53549124103&partnerID=8YFLogxK

U2 - 10.1016/j.joen.2008.08.004

DO - 10.1016/j.joen.2008.08.004

M3 - Article

VL - 34

SP - 1391

EP - 1395

JO - Journal of Endodontics

JF - Journal of Endodontics

SN - 0099-2399

IS - 11

ER -