title: Pitting corrosion resistance of nickel-titanium rotary instruments with different surface treatments in seventeen percent ethylenediaminetetraacetic Acid and sodium chloride solutions.
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.
authors.affiliation: Private practice, Catania, Italy. endomaterials@fastwebnet.it
authors.forename: Antonio
authors.initials: A
authors.lastname: Bonaccorso
authors.forename: Teresa Roberta
authors.initials: TR
authors.lastname: Tripi
authors.forename: Gianni
authors.initials: G
authors.lastname: Rondelli
authors.forename: Guglielmo Guido
authors.initials: GG
authors.lastname: Condorelli
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Cantatore
authors.forename: Edgar
authors.initials: E
authors.lastname: Schäfer
mesh_terms: D002614:Chelating Agents / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D003775:Dental Polishing; D004492:Edetic Acid / Q000737:chemistry*; D004563:Electrochemistry; D004867:Equipment Design; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D011048:Polarography; D011199:Potentiometry; D018915:Root Canal Preparation / Q000295:instrumentation*; D012965:Sodium Chloride / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D020099:Coated Materials, Biocompatible; D003722:Dental Alloys; C040654:titanium nickelide; D012965:Sodium Chloride; C041500:titanium nitride; D009532:Nickel; D004492:Edetic Acid; D014025:Titanium