Assessment of ceramic repressing effect on color and translucency of pressable ceramic materials

Aim: This study aimed to determine the repressing impact of Celtra and GC with varying weight percentages on color, translucency using the spectrophotometer, and the effect of immersion in different types of media of ceramic discs. Materials and Methods: Sixty ceramic disc-shaped samples were constructed by heat pressing technique. All samples were split into two groups based on the kind of ceramic material. Group G :GC lisi press , and Group C: Celtra press . then split up into five subgroups based on the repressing weight percentage into : 100% new, 75% new and 25% repressed ceramic, 50% new and 50% repressed ceramic, 25% new and 75% repressed ceramic,100% repressed ceramic. Further, each subgroup samples were classified into two classes according to the immersion solution, Class L: lemon juice, Class T: green tea All samples subjected to measure the translucency and color change before and after immersion. Results: Ceramic type, and Immersion medium had a statistically significant impact on mean Change in color, repressing wight percentage had no statistically significant impact on mean ΔE, repressing weight percentage, immersion, and immersion medium had a statistically significant impact on mean translucency parameter (TP). There was a statistically significant difference between the mean TP of different repressing weight percentages. Green tea indicated statistically significantly less mean TP than lemon juice. Conclusion: Ceramic type and immersion medium had a significant effect on both color and translucency, the mix of new ingot with repressed ceramic are in the clinical acceptance range as regard ΔE.