R D Douglas1, M Przybylska. 1. School of Dental Medicine, Southern Illinois University, Alton, IL 62002, USA. Rodougl@slue.edu
Abstract
STATEMENT OF PROBLEM: Production of a ceramic dental restoration that matches a target shade is dependent on porcelain thickness. Even when adequate porcelain thickness exists, clinical shade matches are difficult to achieve. PURPOSE: This study predicted the thickness of dentin porcelain required to obtain a clinical shade match (</=3 DeltaE units) for a variety of dental porcelain systems and shades. MATERIALS AND METHODS: Three all-ceramic crown systems (Empress, Inceram-Alumina, Inceram-Spinell) and 2 metal ceramic systems (Vintage, VMK-95) were evaluated, each in shades A1, A3, and C2. Five specimens of each porcelain, of each shade, were fabricated at thicknesses of 1.0, 1.2, 1.5, and 2.0 mm. CIE-LAB coordinates were recorded for each specimen, and for the midgingival third of corresponding shade tabs with a Minolta CR-321 colorimeter. RESULTS: Seventy percent of the color difference between specimen and shade tab was due to high L* (Munsell value) in the specimens. At thicknesses of </=2.0 mm of dentin porcelain, the all-ceramic systems exhibited more shade matches than the metal ceramic systems. CONCLUSIONS: Specimens made from semi-translucent all-ceramic systems exhibited clinical shade matches that were superior to those made with the metal ceramic systems. Increasing thickness of the semi-translucent systems from 1.0 to 2.0 mm did not improve shade matching.
STATEMENT OF PROBLEM: Production of a ceramic dental restoration that matches a target shade is dependent on porcelain thickness. Even when adequate porcelain thickness exists, clinical shade matches are difficult to achieve. PURPOSE: This study predicted the thickness of dentin porcelain required to obtain a clinical shade match (</=3 DeltaE units) for a variety of dental porcelain systems and shades. MATERIALS AND METHODS: Three all-ceramic crown systems (Empress, Inceram-Alumina, Inceram-Spinell) and 2 metal ceramic systems (Vintage, VMK-95) were evaluated, each in shades A1, A3, and C2. Five specimens of each porcelain, of each shade, were fabricated at thicknesses of 1.0, 1.2, 1.5, and 2.0 mm. CIE-LAB coordinates were recorded for each specimen, and for the midgingival third of corresponding shade tabs with a Minolta CR-321 colorimeter. RESULTS: Seventy percent of the color difference between specimen and shade tab was due to high L* (Munsell value) in the specimens. At thicknesses of </=2.0 mm of dentin porcelain, the all-ceramic systems exhibited more shade matches than the metal ceramic systems. CONCLUSIONS: Specimens made from semi-translucent all-ceramic systems exhibited clinical shade matches that were superior to those made with the metal ceramic systems. Increasing thickness of the semi-translucent systems from 1.0 to 2.0 mm did not improve shade matching.