Original scientific paper
Application of Spectrophotometry and Ion Chromatography for Monitoring the Chemical Stability of Dental Ceramics in an Acid Solution
Marko Jakovac
Jasenka Živko-Babić
Lidija Ćurković
Josip Pandurić
Vjekoslav Jerolimov
Abstract
The corrosive process of dental alloys is very well known, although little information is available on the corrosion of dental ceramics. The aim of this study was the analysis of the chemical stability of two dental ceramics in an aggressive acid medium. Two samples of feldspathic ceramic fused to Co-Cr and Ni-Cr alloy and a sample of hydrothermal ceramic fused to high-noble gold alloy were deposited in 10-3 mol/L HCl at 50°C during six months. The solutions were analysed after one, two, three and six months. The determination of Na+, K+, Ca2+ and Mg2+ was performed by ion chromatography (IC), the quantities of the eluted Si4+ and Al3+ were determined by spectrophotometric method and the weight loss of each sample was measured by an analytical scale. The changes of the pH values were determined by means of a pH meter. The results showed that most ions were eluted after the first three months, while after that period of time elution was significantly lower in each sample. The sample with hydrothermal ceramic showed the most significant elution and the highest weight loss. The pH values changed in each leachate sample, but stabilised after the 3rd month of the investigation. It can be concluded that dental ceramics are not stable in an acid medium.
Keywords
chemical stability; dental ceramics; ion chromatography
Hrčak ID:
3041
URI
Publication date:
15.3.2002.
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