title: Influence of abutment substrates on the colour of metal-free polymer crowns.
abstract: New-generation composite materials have excellent strength and wear resistance, and thus can be used to make metal-free crowns. However, composite materials are translucent, and so when using them to make metal-free crowns, it is necessary to take the effect of the abutments into consideration. In this study, five types of materials including three types of new-generation composite materials, a conventional composite material, and a ceramic material were used to examine the translucency (contrast ratio) of the materials and the effects of the colour of the abutments on the final appearance of metal-free crowns. It was found that the materials varied slightly from one-another in translucency and that it was possible to reproduce the desired colour when gold alloy was used for the background. However, it was difficult to produce an adequate colour match when silver-palladium alloy was used for the background. When a tooth colour material that was darker than the target colour was used for the abutment teeth, some materials could not reproduce the target colour satisfactorily.
authors.affiliation: Division of Oromaxillofacial Regeneration, Osaka University Graduate School of Dentistry, Yamadaoka, Suita, Osaka, Japan. tnakamur@dent.osaka-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Nakamura
authors.forename: O
authors.initials: O
authors.lastname: Saito
authors.forename: M
authors.initials: M
authors.lastname: Mizuno
authors.forename: S
authors.initials: S
authors.lastname: Kinuta
authors.forename: S
authors.initials: S
authors.lastname: Ishigaki
mesh_terms: D003188:Composite Resins; D003442:Crowns; D000044:Dental Abutments; D004955:Esthetics, Dental; D006801:Humans; D017797:Prosthesis Coloring
chemical_list: D003188:Composite Resins