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Objective: The objective of this study was to examine the influence of material type, thickness, and substrate color on the masking ability of two ceramics on various substrates.
Materials and methods: In total, 36 disc-shaped specimens (15 mm in diameter × 0.5- and 1.0-mm thicknesses) were fabricated from lithium disilicate glass ceramic (IPS e.max Press, n = 6), high-translucent zirconia (Lava Plus, n = 6), and high-translucent zirconia with liner material (Lava Plus/Liner, n = 6). Contrast ratios were measured over white and black substrates. Color differences were measured over different substrates: white, black, metal, and resin composite shades A2, A3, and C4. White and A2 substrates were used as reference groups. Contrast ratio and color difference values were analyzed with linear regression (P<0.05).
Results: Contrast ratios in the IPS e.max Press group at 0.5 and 1.0 mm showed the highest values (0.73 ± 0.04 and 0.87 ± 0.01) when compared with those in the Lava Plus and Lava Plus/Liner groups. IPS e.max Press at both thicknesses showed the highest masking ability over various substrates. Higher contrast ratio and masking ability were significantly related to thicker material. Material type, thickness, and substrate were significantly related to masking ability.
Conclusion: Ceramic type, thickness, and substrate color are strongly associated with contrast ratio and masking ability, both of which increase as thickness increases.
Clinical implications: Increased ceramic thickness could benefit masking ability. For improved masking ability, IPS e.max Press is recommended over Lava Plus and Lava Plus/Liner for the masking of dark substrates.
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