Study objective: The purpose of this in vitro study was to determine the translucency of 2 materials used for monolithic restorations by assessing their translucency parameters (TPs) with different thicknesses.
Material and methods: thirty-six specimens were prepared of two materials: lithium disilicate and Resinous hybrid ceramic (Hyramic) (Shenzhen Upcera
Dental Technology Co., Ltd) with three different thicknesses of 0.5, 0.9 and 1.2mm. Then the translucency was evaluated between them through measuring of translucency parameters (TPs) against black and white tiles using spectrophotometer in 2 different areas on each specimen. Data were analyzed using 2-way ANOVA (a=.05).
Results: Mean (TPs) values of Dental lithium disilicate were significantly higher than that of Hyramic for all thicknesses, the highest value was found with 0.5 mm samples, followed by 0.9 mm samples, while the lowest value was found with 1.2 mm samples (P<.001).
Conclusions: since lithium disilicate showed higher translucency in most tested group, so when higher masking effect needed its preferable to use resinous hybrid ceramic than using dental lithium disilicate due to its lower translucency, using thicker ceramic offers higher masking power for both materials as translucency decreases with the increase in thicknesses.