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Information Journal Paper

Title

THE EFFECT OF TWO SHADING TECHNIQUES ON VALUE OF ZIRCONIA-BASED CROWNS

Pages

 Start Page 129 | End Page 133

Abstract

 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 (DE) and VALUE changing (DL) 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 DE and DL variables showed a significant difference between groups A (uncolored) and C (staining with brush) with PΔE=0.006 and PDL=0.039, respectively. A significant difference between group B (submerging technique) and C (staining with brush) were shown when these two variables were compared (PDE=0.001, PDL=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.

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