Pitting Corrosion Resistance of Nickel-Titanium Rotary Instruments with Different Surface Treatments in Seventeen Percent Ethylenediaminetetraacetic Acid and Sodium Chloride Solutions

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

Research output: Contribution to journalArticlepeer-review

Abstract

This study evaluated the pitting corrosion resistance of nickel-titanium (NiTi) rotary instruments with different surface treatments in 17% ethylenediaminetetraacetic acid (EDTA) and NaCl solutions. Electropolished RaCe instruments were allocated to group A, non-electropolished RaCe instruments to group B, and physical vapor deposition (PVD)-coated Alpha files to group C (10 instruments per group). Electrochemical measurements were carried out by using a potentiostat for galvanic current measurements. On the basis of electrochemical tests, no localized corrosion problems are to be expected in EDTA. In NaCl, pitting potential occurred at higher values for the electropolished and PVD instruments, indicating an increased corrosion resistance. There appears to be a risk of corrosion for NiTi instruments without surface treatments in contact with NaCl. NiTi files with PVD and electropolishing surface treatments showed an increase corrosion resistance.

Original languageEnglish
Pages (from-to)208-211
Number of pages4
JournalJournal of Endodontics
Volume34
Issue number2
DOIs
Publication statusPublished - Feb 2008

Keywords

  • Endodontic files
  • irrigating solutions
  • localized corrosion
  • Ni-Ti alloy
  • surface treatments

ASJC Scopus subject areas

  • Dentistry(all)

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