title: Influence of abutment materials on the resultant color of heat-pressed lithium disilicate ceramics.
abstract: The purpose of this study was to evaluate the influence of abutment materials on the color of IPS Empress 2 ceramic coping with different thicknesses. Ceramic coping specimens (12.0x12.0x0.8-2.0 mm) were fabricated from IPS Empress 2 material (Ingot-100, n=5/group). Abutment specimens were fabricated from a build-up composite, a gold alloy, or a silver-palladium alloy. Color was evaluated using a colorimeter according to the CIE L*a*b* system. The L*a*b* values of the ceramic coping specimens of different thicknesses on each abutment specimen were measured. Following which, the color difference (deltaE*ab) values between the ceramic coping specimens on various abutment specimens were calculated. Significant differences in deltaE*ab value were observed among different abutment specimens at certain ceramic coping thicknesses (P<0.05). Thus, it was concluded that the color of IPS Empress 2 coping material was influenced significantly by both the thickness of the coping and the color of the abutment material.
authors.affiliation: Department of Crown and Bridge Prosthodontics, Nihon University School of Dentistry, Tokyo, Japan. shimada-kz@dent.nihon-u.ac.jp
authors.forename: Kazuki
authors.initials: K
authors.lastname: Shimada
authors.forename: Motoko
authors.initials: M
authors.lastname: Nakazawa
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kakehashi
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsumura
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D000704:Analysis of Variance; D003116:Color; D000044:Dental Abutments; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*
chemical_list: D000538:Aluminum Silicates; D003764:Dental Materials; C075815:IPS-Empress ceramic; D003776:Dental Porcelain