Translucency of Cad/Cam Veneers Using Different Internal Relief Spaces and Luting Cement Shades

Abstract

Statement of Problem: Many studies have investigated translucency of ceramic veneers in association with different trial insertion paste materials.1,2,3. Little information is available on the ef- fect of cement space thickness on the final shade color of glass ceramic, feldspathic and zirconia reinforced glass ceramic veneers. Purpose: The aim of the study is to evaluate translucency of three different CAD/CAM ve- neer materials with different internal relief spaces and different cement shades. Material and Method: Sixty samples were constructed and classified according to the type of materials into three main groups ( I ) IPS e.max CAD MT , ( II ) VITA Vitablocs Mark II and group ( III ) Vita Suprinity (20 samples each). Each group were subdivided into two subgroups (10 samples each) according to the internal relief space (100 µm and 30 µm).The internal relief space was determined based on data from a previous 123 study and available resources. Each subgroup were further subdivided into six classes according to the 4 type of trial cements used : the control class ( glycerine ) and five trial paste class- es according to their shade (Translucent Shade, White Opaque Shade, A1/Light Yellow Shade, A3 Opaque/Yellow Opaque Shade and B0.5/ White Shade (10 sam- ples each) according to shade of the trial cement used. The color test was done using reflectance spectrophotometer device ( Vita Easy shade V). Color coordinates were measured in the body region of all laminate ve- neers with different combinations of laminate veneer material, internal relief space, and trial insertion paste color on composite resin abutment A3 . Results: The consistency of the translucency among the tested specimens was confirmed using a 2-way ANOVA and the Tukey HSD post hoc test (P<.05). The luminous transmittance exhibited a statistically significant dependence on different ceramic restorations with a cad cam veneers in various internal relief space and different cement shades combinations. (P<.05). Conclusions: The underlying color of the tested trial insertion pastes caused color change (?E >3.7) for all ceramic material used in this study.