Comparison of contrast ratio of two ceramics in two different thicknesses

Purpose: To compare and evaluate the influence of material type and thickness on contrast ratio. Materials and Methods : A total of 36 disc-shaped specimens (15 mm diameter × 0.5 and 1.0 mm thicknesses) were fabricated from IPS e.max Press (n=12), Lava Plus (n=12), Lava Plus + Lava Ceram shade MO W1 (n=12). Contrast ratio was analyzed with two way ANOVA (P<;.05). Results: Contrast ratio of IPS e.max Press at 0.5 and 1.0 mm showed highest value (73.27 ± 4.37 and 87.30 ± 0.58) when compared to Lava Plus + Lava Ceram and Lava Plus groups. Higher contrast ratio significantly related to thicker material. Conclusion: Ceramic type and thickness had significant effect on contrast ratio. Contrast ratio increase as thickness increase.