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Title: Dental casting alloys behaviour during power toothbrushing with toothpastes of various abrasivities. Part II: corrosion and ion release
Author: Molina, C.
Nogués Pujol, Lluís
Martínez Gomis, Jordi
Peraire Ardèvol, Maria
Salsench Cabré, Juan
Sevilla, P.
Gil, F. X. (Francesc Xavier)
Keywords: Higiene dental
Higiene bucal
Corrosió i anticorrosius
Materials dentals
Dental hygiene
Oral hygiene
Corrosion and anti-corrosives
Dental materials
Issue Date: Sep-2008
Publisher: Chapman & Hall
Abstract: The purpose of this study was to evaluate the long term effect of abrasivity of toothpastes normally used over the corrosion behavior and ion release of the different dental casting alloys. Three dental casting alloys (Ni-Cr, Co-Cr and commercially pure Ti) were studied. Four specimens of each material were immersed, brushed without paste or brushed with one of four toothpastes of different Relative Dentine Abrasivity (RDA 50, 52, 80, and 114). An electric toothbrush with a load of 250 g was used for 420 min. Corrosion behavior was determined by means a potenciostat with high sensitivity and the ion release determined by Inductively Coupled Plasma-Mass Spectrometry. Two-way ANOVA and non-parametric tests were used to detect significant differences. Titanium specimens exhibited the best corrosion behavior after and before the toothbrushed, being the worst of the three alloys the Cr-Ni. Titanium oxide produced spontaneously on the Ti surface is the main cause of the high corrosion resistance of the material. However, the eutectoid of the CrNi with chemical composition between different phases produces pitting on the phases boundaries with an important decrease of the corrosion resistance. Besides, the CrNi produces high values of the Ni and Cr release. Slight increment in roughness were observed after toothbrushing and depended on the material but not on the toothpaste used. The increase of the microhardness (residual stresses) provokes a decrease of the corrosion resistance and an increase of the ion release.
Note: Versió postprint del document publicat a:
It is part of: Journal of Materials Science-Materials in Medicine, 2008, vol. 19, num. 9, p. 3015-3019
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ISSN: 0957-4530
Appears in Collections:Articles publicats en revistes (Odontostomatologia)

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