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Effect of Firing on the Color Stability of a Light‐Cured Ceramic Stain
Author(s) -
Reis Rodrigo S.,
Neiva Gisele F.,
Yaman Peter,
Razzoog Michael E.
Publication year - 1996
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.1996.tb00294.x
Subject(s) - stain , materials science , significant difference , color difference , color measurement , composite material , medicine , optics , staining , pathology , physics , filter (signal processing) , computer science , computer vision
Purpose This study evaluated the color stability of four stains of a light‐cured porcelain stain system between the light‐cured and fired stages. Materials and Methods Thirty‐six ceramometal discs 20 mm in diameter and 2 mm in thickness were cast to provide the substrate on which Ceramco II porcelain was applied. The porcelain was polished to a uniform thickness of 2 mm, and the samples were divided into four groups and assigned a color (yellow, orange, green, or blue). Orbit LC stain was applied in a thin layer and light‐cured for 40 seconds. After light‐curing, three color readings were made with a Minolta Chroma Meter II. The porcelain discs were then fired in a porcelain oven and three color measurements were again made. The pre‐ and postfired Commission Internationale de I'Eclairage L*a*b* values were recorded and the color difference (ΔDLE) was calculated for each specimen. The clinical significance for the computed ΔDLE ratings was completed according to previously modified criteria. Results The results show that the mean ΔDLE between the light‐cured and fired stages of Orbit LC are clinically acceptable. No statistically significant differences (p < .05) were observed between any of the four groups. Conclusions A light‐cured porcelain stain system was evaluated for color stability between light‐cured and fired stages. Within the conditions of this study, the following conclusions can be made: (1) There was no clinically significant color difference between light‐cured and fired stages for the stain colors evaluated; and (2) the final color of the restorations altered with light‐cured stains can be predicted before firing.