Abstract
A lot of shaded zirconia blocks are being introduced into the market. Their effect on the final shade of the restoration is yet uncertain. Twenty-four zirconia crowns were fabricated for 8 patients who needed to restore a single maxillary central incisor, and divided into 3 groups according to the color and type of the zirconia (Zr) used (white Zr core, colored Zr core, and monolithic high translucency (ht) Zr crowns). Using Easyshade spectrophotometer, delta E color difference was calculated between fabricated crown and adjacent tooth. The ΔEs obtained were assessed based on 1.6 ΔE which represented the color difference that could not be detected by the human eye and considered clinically acceptable. No statistically significant values were found between the 3 groups related to different Zr color and type. Within the limitations of this study, it could be concluded that the shade of the zirconia blank had no significant effect on the final color of the crown. This raises reasonable doubt about the necessity to use colored zirconia blanks or use of dip-in solutions. The clinical implications were that, there was no need to use colored zirconia cores to get more esthetically pleasing restorations with respect to color perception. The use of monolithic high translucent zirconia crowns gained the advantages of high translucency and color reproduction. Key words:Zirconia, easyshade, monolithic, spectrophotometer, delta E.
Highlights
The replication of natural teeth, especially with single-tooth restorations, represents a challenge
The final color result is unpredictable when the restoration is composed of different layers with unspecified thicknesses, which is the case for core veneered all-ceramic restorations [4]
Zirconia was the material of choice for its improved mechanical strength and unique stress-induced transformation toughening mechanism and proven biocompatibility [24,25]
Summary
The replication of natural teeth, especially with single-tooth restorations, represents a challenge. Zirconia frameworks are naturally white in color that may negatively influence the final esthetic appearance of the veneered restoration. Colored zirconia frameworks were introduced to the dental market to enhance color reproduction of ceramic restorations especially in cases with inadequate space to accommodate the required thickness of both framework and ceramic veneer. They could eliminate the use of masking liner material over white zirconia frameworks. High translucency zirconia was introduced, with its promising performance to match lithium disilicate in esthetics and surpass it in strength This material can be milled into full contour crowns. The hypothesis of this study was: There will be a difference in color replication potential of different zirconia frameworks investigated
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