Changes in scattering and absorption properties of esthetic filling materials after aging
✍ Scribed by Yong-Keun Lee; Bum-Soon Lim; Sang-Hoon Rhee; Hyeong-Cheol Yang; Yong-Kyu Lim
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 740 KB
- Volume
- 80B
- Category
- Article
- ISSN
- 1552-4973
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✦ Synopsis
Abstract
Objectives
Assuming that color changes after aging are related to changes in translucency of materials, the purpose of the present study was to determine the correlation between the changes in color and the changes in scattering and absorption properties after accelerated aging with representative dental esthetic restorative materials: glass ionomer, resin‐modified glass ionomer, compomer, and resin composite.
Methods
Color was measured according to the CIELAB color scale in the transmittance and reflectance modes and used to calculate changes in color (Δ__E__*~ab~), color coordinates (Δ__L__*, Δ__a__*, and Δ__b__*), translucency parameter (Δ__TP__), scattering coefficient (Δ__S__), absorption coefficient (Δ__K__), and light reflectivity (Δ__RI__) after accelerated aging. Simple correlations between each pair of the changes in optical values were calculated, and multiple regression analysis was used to determine the parameters influencing the changes in color and color coordinates (p = 0.05).
Results
In the resin composite and compomer, Δ__S__, Δ__K__, and Δ__RI__ values were approximately zero, whereas Δ__S__ was as high as 8.9 in the glass ionomer. For most comparisons, correlation coefficient (r) was between 0.700 and 0.997. Δ__L__* was found to have a major influence on color changes, and Δ__S__, Δ__TP__, and Δ__RI__ influenced Δ__L__*. Therefore, changes in scattering and absorption properties, after aging, were closely correlated with changes in color and color coordinates, especially in glass ionomer‐based filling materials. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007