الفهرس 
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Abstract
This study assessed the impact of the coloring technique on the surface roughness and surface hardness of monolithic zirconia blocks.
Thirty presintered disk-shaped specimens were created from monolithic zirconia blocks. A total of twenty disks were obtained from zirconia blocks that were completely white, while ten disks were obtained from blocks that were precolored. The samples were categorized into three groups based on the coloring method used.
Every group underwent testing for both surface roughness and surface microhardness.
The data underwent analysis using a one-way ANOVA test to compare the means of three groups, followed by the Bonferroni post hoc test.
SEM photomicrographs were captured using a Quanta 250 FEG microscope at a magnification of ×500. These images were then examined visually to evaluate and analyze the surface morphology.
Data werecollected,tabulated,and statisticallyanalyzed. Conclusions:
1-Coloring techniques affect both surface roughness and surface hardness of monolithic zirconia blocks
2-White monolithic zirconia had the roughest surface, and dipping it in a coloring liquid decreased its surface roughness.
3-The highest Vickers hardness number was recorded in precolored zirconia samples.
Clinical recommendations:
Precolored zirconia is more preferred than white zirconia in dental use Great caution must be taken in the coloring procedure of zirconia crowns