title: Spectrophotometric evaluation of the influence of different backgrounds on the color of glass-infiltrated ceramic veneers.
abstract: The purpose of this spectrophotometric study was to evaluate the influence of different color backgrounds on Vita In-Ceram (Vident) glass-infiltrated ceramic veneers. A total of 50 color background disks were fabricated from Vitadur Alpha 2M2 (n=30) and 5M1 (n=20) dentin porcelain (Vi-dent). Ceramic veneer disks were fabricated from In-Ceram Spinell (n=20) or In-Ceram Alumina (n=20) glass-infiltrated core veneered using Vitadur Alpha 2M2 dentin porcelain. In addition, 10 ceramic veneer disks were fabricated from feldspathic dentin porcelain Vitadur Alpha 2M2. The ceramic veneer specimens were bonded onto the color background specimens using dual-curing luting composite cement, creating the following groups (each n=10): S2M2 (Spinell/2M2), S5M1 (Spinell/5M1), A2M2 (Alumina/2M2), A5M1 (Alumina/5M1), and control (Vitadur Alpha/2M2). L*a*b* color coordinates were measured five times for each specimen using a Vita Easyshade (Vident) spectrophotometer. Mean color differences (deltaE) between each study group and the control group were: 3.79 for S2M2; 7.24 for S5M1; 5.86 for A2M2, and 7.32 for A5M1. Two-way ANOVA showed statistically significant differences in deltaE between all groups. However, a t test revealed that the statistically significant differences only existed between groups S2M2/S5M1, A2M2/A5M1, and S2M2/A2M2. The results suggest that vacuum infiltration with a translucent glass provides the Spinell and Alumina ceramic veneers with increased semi-translucency, which makes them highly influenced by discolored backgrounds. In-Ceram Spinell glass-infiltrated ceramic veneers could be considered as an alternative to conventional feldspathic veneers for the restoration of nondiscolored teeth. Although Spinell and Alumina ceramic veneers could enhance the final color establishment of discolored teeth, the results would not be clinically acceptable.
authors: Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Greece. decharis@altecnet.gr
authors: Dimitrios
authors: D
authors: Charisis
authors: Spiridon-Oumvertos
authors: SO
authors: Koutayas
authors: Photini
authors: P
authors: Kamposiora
authors: Asterios
authors: A
authors: Doukoudakis
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D000538:Aluminum Silicates / Q000737:chemistry; D003116:Color; D003188:Composite Resins / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D003801:Dental Veneers; D005898:Glass / Q000737:chemistry*; D006801:Humans; D007811:Lanthanum / Q000737:chemistry; D008027:Light; D008277:Magnesium Oxide / Q000737:chemistry; D008422:Materials Testing; D008903:Minerals / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D017680:Potassium Compounds / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D013053:Spectrophotometry
chemical_list: D000538:Aluminum Silicates; D003188:Composite Resins; D003764:Dental Materials; C483026:In-Ceram Alumina; D008903:Minerals; C092987:Optibond; D010087:Oxides; C438843:Panavia-Fluoro; D017680:Potassium Compounds; D019279:Resin Cements; C111130:spinell; C483027:vitadur alpha; D003776:Dental Porcelain; C016447:feldspar; C070870:In-Ceram; D008277:Magnesium Oxide; C103829:lanthanum oxide; D007811:Lanthanum; D000537:Aluminum Oxide