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18389346

Source:http://linkedlifedata.com/resource/pubmed/id/18389346

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pubmed-article:18389346pubmed:issue9lld:pubmed
pubmed-article:18389346pubmed:dateCreated2008-6-23lld:pubmed
pubmed-article:18389346pubmed:abstractTextThe 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.lld:pubmed
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pubmed-article:18389346pubmed:authorpubmed-author:MolinaCClld:pubmed
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pubmed-article:18389346pubmed:volume19lld:pubmed
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pubmed-article:18389346pubmed:pagination3015-9lld:pubmed
pubmed-article:18389346pubmed:dateRevised2010-11-18lld:pubmed
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pubmed-article:18389346pubmed:year2008lld:pubmed
pubmed-article:18389346pubmed:articleTitleDental casting alloys behaviour during power toothbrushing with toothpastes of various abrasivities. Part II: corrosion and ion release.lld:pubmed
pubmed-article:18389346pubmed:affiliationFaculty of Dentistry, Department of Prosthodontics, Universitat de Barcelona, Barcelona, Spain.lld:pubmed
pubmed-article:18389346pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:18389346pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed