Abstract
The present study was conducted to evaluate discoloration and accretion on the polished surface of dental cast metal in the oral cavity. The metal surface was observed and evaluated using an electron probe X-ray micro analyzer. Prosthetic appliances that have 12 Wt% Au-Ag-Pd alloy were also treated and observed in the same manner.
The results were as follows:
Analysis of the constituent materials of the denture
1. According to gross assessment of discoloration and accretion done on each sample, a wide variance was observed between individual patients.
2. The least surface roughness following polishing was observed in Au-Pt alloy and the largest in titanium prior to treatment. However, the titanium sample showed the least surface roughness after two months of treatment.
3. According to the results of qualitative analysis, elements such as 0, C, P and Ca were detected after two months of treatment.
4. A larger amount of accretion was found on 12 Wt% Au-Ag-Pd alloy than other metal materials.
Analysis of prosthetic appliances
Elements such as C and S were detected on the appliance without discoloration and these elements as well as 0, P and Ca were detected on the discolored appliance.
