Effect of Lithium Disilicate Ceramic Thickness on the Color of Discromic Substate
The aim of this study was to evaluate the influence of the thickness of lithium disilicate ceramics (medium opacity) on the color perception of pressed full-ceramic restorations, in various situations of discromic substrate. The color parameters of ceramic disks (10 mm diameter, thickness 0.3, 0.6, 0.9, 1.2, 1.5mm), (n=5), of IPS e.max® Press MO 0 (Ivoclar Vivadent) were evaluated upon samples of light cured composite material that simulate the shade of prepared teeth (IPS Natural Die Material Kit, Ivoclar Vivadent) (disks 10mm diameter, 5mm thickness). Saturated sucrose solution was interposed between the ceramic disks and the composite disks. The color parameters CIE L*, a*, b* were recorded by using a spectrophotometer (VITA Easyshade® Advance, VITA Bad Säckingen, Germany). The color difference E was calculated. Statistical analysis of the data revealed that the increase in thickness of the ceramic layer will lead to an increased masking of the discolored background by the ceramic layer.
Iulian Antoniac, Simona Cavalu and Teodor Traistaru
A. Botos et al., "Effect of Lithium Disilicate Ceramic Thickness on the Color of Discromic Substate", Key Engineering Materials, Vol. 614, pp. 95-99, 2014