الفهرس | Only 14 pages are availabe for public view |
Abstract Purpose: The purpose of this study is to evaluate the translucency of different compositions of admixed zirconia ceramics. Materials and methods: One hundred and twenty specimens of different compositions of zirconia. The specimens will be divided into five equal groups. Each group will include twenty-four specimens (n=24). High and low translucent zirconia powders were mixed (TOSOH-ZIRCONIA TZ- 3YSB, TZ-PX-242A) according to the pre-determined ratio corresponding with each group. Zirconia discs were made using metal mold. Mold was lathe made with( 20 mm length, 15 mm width and 5 mm thickness). Before translucency measurements, all of the specimens were ultrasonically cleaned, the thicknesses of the specimens were controlled with a digital caliper and the thicknesses of all specimens were set to 0.5 ± 0.05 mm. Translucency measurements were performed with VITA Easyshade Compact spectrophotometer after each stage and translucency parameter was calculated. Data were statistically analyzed with repeated measures ANOVA and Tukey multiple comparison test. Results: There was a highly significant difference between each single group P-value (0.000**). The mean translucency parameter (TP) and standard deviation value of group5(100% by weight of high translucent zirconia powder) was (8.66±1.01) which was higher than other groups while the mean TP value for group4(100% by weight of low translucent zirconia powder) was (4.63±1.27) the least. Conclusion: Translucency of tested specimens were(8.66±1.01), (7.62±1.08), (6.07±1.07), (5.44±0.94), (4.63±1.27).For group5, group2, group1, group3, group4 respectively. |