الفهرس 
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Abstract
Veneered zirconia restorations were proved to have a high rate of failure due to the chipping of the veneering material, thus monolithic zirconia was developed. However, this type of restorative material had a major drawback, which is time consumption during the sintering process. Therefore, it was essential to reduce the sintering time, in order to make monolithic zirconia a chair-side option, without hindering the strength or aesthetics of the material.
The aim of this study was to evaluate the effect of speed and super-speed sintering compared to conventional sintering on monolithic zirconia, regarding the translucency and biaxial flexural strength.
In this study, Forty-five 15 mm x 1.8 mm Y-TZP zirconia discs were fabricated from Dentsply Sirona inCoris TZI Blocks and divided into three groups (n=15) according to sintering time; group SS: super-speed sintering, group S: speed sintering and group CV: conventional long-term sintering. The Translucency Parameter (TP) values were then calculated for each specimen.
Using a spectrophotometer, the CIE-L* a* b* colour values were obtained, and the Translucency Parameter (TP) was calculated.
It was found that the translucency was best when the zirconia was sintered in the speed cycle, followed by those sintered in the conventional cycle, and the least translucency was achieved using the super-speed sintering cycle.