In vivo Evaluation of Shade Replication of Different Generations of Zirconia to Natural Teeth Using Digital Color Determinations
Ghada Ayash, Mohammad Mostafa Rayyan, Lucette Segaan, Mohamed Sayed
Delta E, Easyshade, Resin cement, Spectrophotometer, Zirconia
Citation Information :
Ayash G, Rayyan MM, Segaan L, Sayed M. In vivo Evaluation of Shade Replication of Different Generations of Zirconia to Natural Teeth Using Digital Color Determinations. J Contemp Dent Pract 2023; 24 (8):545-550.
Aim: The color difference between the final shade of restorations milled from different zirconia blocks, and the control teeth in the esthetic zone is yet uncertain.
Materials and methods: For eight patients who required a singular maxillary central incisor restoration, twenty-four crowns made of zirconia were created. These were grouped into three categories based on the shade and nature of zirconia (Zr) utilized (white core, colored core, and monolithic high-translucency (ht) Zr crowns). The difference in color (ΔE) between the three zirconia crowns and the neighboring teeth was calculated by the use of Easyshade spectrophotometer. Two shades of resin luting cement were used. The measured ΔE values were evaluated based on a clinically acceptable color difference of 1.6ΔE, which is not visible to the human eye.
Results: Among the three groups, no differences of statistical significance were observed in terms of ΔE with different Zr types and resin cement color.
Conclusion: Within the limits of this study, the usage of different shades of zirconia blanks and resin cements did not display a statistically significant effect on the final color of the crown.
Clinical significance: Changing the shade of resin cements does not appear to add value to the final shade of crown. In addition, the generation of zirconia does not influence the shade of the crown. Crowns made of zirconia can be cemented with opaque or transparent cement with no effect on the final color.
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