| Abstrakt: |
Statement of the Problem: By introducing the coloring liquids, it is claimed that it is possible to make the color of frameworks fabricated from zirconium oxide extremely close to the natural tooth color. Purpose: The purpose of this research was to evaluate the effect of two staining techniques on value changing in zirconia crowns. Materials and Method: Three groups A, B, and C, each containing ten zirconia crowns, were used. The zirconium cores samples were fabricated by a CAD/CAM device. Group A was left uncolored, Groups B was submerged for two minutes in A2 coloring liquid and Group C was stained with brush. Then all cores were sintered and the porcelain was applied by using the layering technique. Ultimately, the crowns color was determined using a spectrophotometer. Their color changing (ΔE) and value changing (ΔL) in relation to A2 color were also assessed. The data were analyzed with one-sample t-test, post-hoc Tukey, and one-way ANOVA tests with significant level set at 0.05. Results: The mean value in all groups was higher than the value obtained from A2 color samples (p=0.001). The highest mean value was 78.31±1.22 belonging to group C (staining with brush) and the lowest mean value was 76.99±0.65 belonging to group B (submerging). The results of post-hoc Tukey regarding both ΔE and ΔL variables showed a significant difference between groups A (uncolored) and C (staining with brush) with PΔE=0.006 and PΔL=0.039, respectively. A significant difference between group B (submerging technique) and C (staining with brush) were shown when these two variables were compared (PΔE=0.001, PΔL=0.015). Conclusion: Due to the higher value increase in surface staining (brush), it is recommended to use the submerging technique for staining zirconia cores. [ABSTRACT FROM AUTHOR] |
