Open AccessThe influence of metal substrates and porcelains on the shade of metal-ceramic complex: A spectrophotometric study
Author(s) -
Kavitha Janardanan,
Sreelal Thankappan Pillai,
K Harshakumar
Publication year - 2012
Publication title -
indian journal of dental research/indian journal of dental research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.277
H-Index - 43
eISSN - 1998-3603
pISSN - 0970-9290
DOI - 10.4103/0970-9290.111279
Subject(s) - materials science , dental porcelain , ceramic , metal , chromium , alloy , abrasion (mechanical) , nickel , metallurgy , composite material
Background: The final esthetic outcome of a metal-ceramic restoration is influenced by several factors including the type of the underlying metal as well as the brand of the ceramic.Settings and Design: An in vitro study.Aims: The purpose of the in vitro study was to investigate the influence of four types of metal-ceramic alloys and two porcelain systems on the color co-ordinates of the metal-ceramic complex. It also aimed at establishing a color index which correlated the color of the metal-ceramic combination to the yellow-blue axis.Materials and Methods: Twenty-four disc-shaped metal specimens of 12 mm × 1 mm were cast from base metal alloys, nickel-chromium (Ni-Cr) (Wiron 99), cobalt-chromium (Co-Cr) (Wirobond C), a palladium (Pd)-rich noble metal alloy (Spartan Plus), and a high noble gold (Au) alloy (Pontostar). These discs were covered with two commercially available feldspathic porcelains (Vita Omega and Shofu Vintage) of A3 shade to a total thickness of 1.2 mm. Each group had six specimens, of which three were coated with Vita Omega and the remaining with Shofu Vintage. Opaque and dentin layers were applied to a standardized thickness of 0.2 mm ± 0.05 mm and 1 mm ± 0.05 mm, respectively onto the metal surface after air abrasion with 50 μm alumina particles. The reflectance spectra were measured with a spectrophotometer and data were recorded in LFNx01, aFNx01 and bFNx01 coordinates in the CIE Lab Color Order System.Statistical Analysis: Analysis of variance (ANOVA) and path analysis were the statistical tools employed to analyze the data. A critical difference (CD) value was calculated for each color co-ordinate to make comparisons between each metal-ceramic combination. A color index for each metal-ceramic complex was also calculated from the color co-ordinates obtained.Results: ANOVA revealed that significant differences existed between the metal-porcelain combination at 0.01 ( P < 0.01) level. The LFNx01 value was significantly higher for Au and Co-Cr alloys with Vita Omega porcelain. The aFNx01 value was highest for Ni-Cr alloy when combined with Shofu Vintage ceramic. The bFNx01 value of Au alloy with Vita Omega porcelain was significantly higher than any other metal-ceramic combination. The color co-ordinates of Pd alloy with both porcelain systems did not show any significant differences. Gold alloy with Vita Omega showed the highest color index value.Conclusion: The variations in metal-ceramic alloy and porcelain can influence the shade of a metal-ceramic restoration. Color index value was the highest for gold alloy