Does Simulated Porcelain Firing Influence Corrosion Properties of Casted and Sintered CoCr Alloys?

Materials

Monika Lukomska-Szymanska¹  Grzegorz Sokolowski²  Dorota Rylska³ 

[1] Department of General Dentistry, Medical University of Lodz, 251 Pomorska St., 92-213 Lodz, Poland;Department of Prosthetics, Medical University of Lodz, 251 Pomorska St., 92-213 Lodz, Poland;Institute of Materials Science and Engineering, Lodz University of Technology, 1/15 Stefanowskiego St., 90-924 Lodz, Poland;

关键词: porcelain firing;    corrosion resistance;    Co-Cr alloys;    sintered alloys;   

DOI  :  10.3390/ma14154147

来源: DOAJ

【 摘 要 】

The aim of the study was to evaluate how heat processing used for dental porcelain firing influences the surface properties of sintered and casted CoCr alloy. Two CoCr alloys, Soft Metal LHK (milling in soft material and sintering) and MoguCera C (casting), were used for the study. The samples were examined using SEM–EDS before and after heat treatment. Next, corrosion examinations (E_corr, j_corr, polarization curve, E_br) were performed. Finally, the samples were evaluated under SEM. Based on the results, the following conclusions might be drawn: 1. Thermal treatment (porcelain firing) did not cause chemical impurities formation on the surface of CoCr alloy; 2. The sintered metal exhibited significantly higher corrosion resistance than the casted one due to its homogeneity of structure and chemical composition; 3. Heat treatment (porcelain firing) decreased the resistance of casted and sintered CoCr alloy to electrochemical corrosion. The reduction in corrosion resistance was significantly higher for the casted alloy than for the sintered alloy; 4. The corrosion resistance decrease might be due to an increased thickness and heterogeneity of oxide layers on the surface (especially for the casted alloy). The development of corrosion process started in the low-density areas of the oxide layers; 5. The sintered metal seems to be a favourable framework material for porcelain fused to metal crowns.

【 授权许可】

Unknown