EFFECT OF ARTIFICIAL GASTRIC ACID AND BRUSHING ON THE OPTICAL PROPERTIES AND SURFACE HARDNESS OF COLORED ZIRCONIA

[5] Zirconia is usually provided as monolithic blocks, difficult to match the natural teeth color. [...]color matching of zirconia is challenging. [8] A study of Kulkarni et al. showed a statistically significant difference in color, surface roughness, and gloss for e-max and porcelain specimens after being subjected to teeth brushing abrasion and gastric acid, in an attempt to stimulate oral conditions. [...]they were polished using a (DIAPOL® by EVE) polishing system starting from blue zirconia polisher (coarse grit, 7,000 rpm), red (medium grit, 7,000 rpm), and white (fine grit, 7,000 rpm), for 15 seconds for each polishing step. Specimen Treatment Artificial gastric acid (0.1N HCL buffer solution of pH 1.2) was prepared using 8.3 ml hydrochloric acid in 1L of distilled water.