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Changes in optical properties of enamel porcelain after repeated external staining

Cited 18 time in Web of Science Cited 22 time in Scopus
Issue Date
2006-06
Publisher
Elsevier
Citation
J Prosthet Dent 2006;95:437-443
Abstract
Statement of problem. After staining a porcelain restoration, increasing the lightness (value) and decreasing
the chroma of a restoration is not practically easy to accomplish.
Purpose. The purpose of this study was to determine the color change of enamel porcelain after repeated external
staining procedures over the enamel porcelain surface. Changes in translucency and differences in surface
roughness were also measured.
Material and methods. Enamel porcelain (VITA OMEGA 900 Metal Ceramics) disks (1 3 12 mm) of
1 shade (EN2) were prepared, and 1 of 4 types of external stains (VITA Akzent stains) was applied over the specimens
and fired. Firing was repeated 3 times after application of the same stains. Color of the specimens before
and after stainings was measured with a reflection spectrophotometer. Two-factor repeated-measures analysis of
variance with the fixed factors of the stain type and number of staining cycles for the changes in CIE L*, CIE a*,
CIE b*, color (DE*ab), and chroma (DC*ab) after repeated staining was performed (a=.05). Chroma change was
calculated as DC*a=(Da*2 1 Db*2)1/2. Changes in translucency (translucency parameter and masking effect) and
difference in surface roughness (Ra) after the third staining cycle were also determined.
Results. Color change after the first staining cycle was perceptible (DE*ab .2) for 2 of 4 types of stains and was
perceptible for all 4 types of stains investigated after the third staining cycle (DE*ab=2.36-11.04). Lightness generally
increased, and chroma also increased after staining but varied by the type of stains and number of staining
cycles. Translucency generally decreased after repeated staining. Surface roughness varied by the type of stain
(P,.001).
Conclusion. Color difference and lightness increased significantly after repeated staining cycles, but chroma
change was small after repeated staining cycles. Therefore, repeated staining may be a method to increase the
lightness of enamel porcelain.
ISSN
0022-3913
Language
English
URI
https://hdl.handle.net/10371/68952
DOI
https://doi.org/10.1016/j.prosdent.2006.04.002
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Appears in Collections:
College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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