title: Analysis of depth of the microporosity in a nickel-chromium system alloy - effects of electrolytic, chemical and sandblasting etching.
abstract: The present study was designed to analyse the average depth of the microporosity of a nickel-chromium (Ni-Cr) system alloy (Verabond II). The metal surface was subject to one of the following surface treatment: (i) Electrolytic etching in nitric acid 0.5 N at a current density of 250 mA cm(-2); (ii) chemical etching with CG-Etch etchant; and (iii) Sandblasting with alumina particles 50 microm. Half of the samples were polished before the surface treatments. The depth of porosity was measured through photomicrographs (500x) with a profilometer, and the data were statistically analysed using an analysis of variance (anova) followed by Tukey's test. The conclusions were (i) Differents surface treatment of the Ni-Cr system alloy lead to different depths of microporosity; (ii) The greatest depth of porosity was observed in non-polished alloy; (iii) The greatest and identical depth of microporosity was observed following electrolytic etching and chemical etching; (iv) The least and identical depth of microporosity was observed with chemical etching and sandblasting with alumina particles 50 microm, and (v) Chemical etching showed an intermediary depth.
authors.affiliation: School of Dentistry of Araraquara, UNESP, Araraquara, SP, Brazil.
authors.forename: H G
authors.initials: HG
authors.lastname: Neto
authors.forename: M S M
authors.initials: MS
authors.lastname: Cândido
authors.forename: A L R
authors.initials: AL
authors.lastname: Júnior
authors.forename: P P N S
authors.initials: PP
authors.lastname: Garcia
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D002858:Chromium Alloys / Q000032:analysis*; D003188:Composite Resins; D001840:Dental Bonding; D003735:Dental Casting Technique; D003830:Denture, Partial, Fixed; D006801:Humans
chemical_list: D002858:Chromium Alloys; D003188:Composite Resins