hrvatski

Određivnje kemijske stabilnosti dentalne keramike u kiselom mediju metodama spektrofotometrije i ionske kromatografije

The corrosive process of dental alloy is well known, although little information is available on the corrosion of dental ceramics. The aim of this study was the analysis of the cmenical stability of two dental ceramics in an aggresive medium. Two samples of feldspatic ceramics in an aggressive medium. Two samples of feldspatic ceramic fused to Co-Cr and Ni-Cr alloy and a sample of hydrothermal ceramic fused to highnobel gold alloy were deposited in 10-3 mol/L HCl at 50 oC 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 chromatographiy (IC), the quantities of eluted Si4+ and Al3+ were determined by spectrophotometric method and the wihgt loss of each sample was measured by analytical scale. The changes of the pH values were determined by menas of a pH meter. The results showed that most ions were eluted after the first three moinths, while after that period of time elution was significantly lower in each sample. The sample with hydrothermal ceramic showed the most significant elutio 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.

Kemijska stabilnost; dentalna keramika; ionska kromatografija

nije evidentirano

engleski

Application of Spectrophotometricy and Ion Chromatography for Monitoring the Chemical Stability of Dental Ceramics in Acid Solution

The corrosive process of dental alloy is well known, although little information is available on the corrosion of dental ceramics. The aim of this study was the analysis of the cmenical stability of two dental ceramics in an aggresive medium. Two samples of feldspatic ceramics in an aggressive medium. Two samples of feldspatic ceramic fused to Co-Cr and Ni-Cr alloy and a sample of hydrothermal ceramic fused to highnobel gold alloy were deposited in 10-3 mol/L HCl at 50 oC 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 chromatographiy (IC), the quantities of eluted Si4+ and Al3+ were determined by spectrophotometric method and the wihgt loss of each sample was measured by analytical scale. The changes of the pH values were determined by menas of a pH meter. The results showed that most ions were eluted after the first three moinths, while after that period of time elution was significantly lower in each sample. The sample with hydrothermal ceramic showed the most significant elutio 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.

chemical stability; dental ceramics; ion chromatography

nije evidentirano