Dental Materials
Volume 23, Issue 3 , Pages 259-264, March 2007

Color changes of resin composites in the reflectance and transmittance modes

  • Yong-Keun Lee

      Affiliations

    • Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, 28 Yeongeon-dong, Jongro-gu, Seoul, Republic of Korea
    • Corresponding Author InformationCorresponding author. Tel.: +82 2 740 8693; fax: +82 2 740 8694.
    • ,
  • John M. Powers

      Affiliations

    • Department of Restorative Dentistry and Biomaterials, Houston Biomaterials Research Center, The University of Texas Dental Branch at Houston, Houston, TX, USA

Received 23 September 2005; accepted 18 January 2006.

Abstract 

Objectives

The objective of this study was to evaluate the changes in color and color coordinates after accelerated aging of resin composites depending on the measuring modes of reflectance and transmittance.

Methods

Color of seven resin composites (1-mm thick specimens) was measured in the reflectance mode and in the transmittance mode. After the baseline color measurement, the specimens were aged for total energy of 150kJ/m2. Color change after aging was calculated in the reflectance mode and in the transmittance mode. Based on the data of A2 shade composites, the influence of measuring mode on the color change and changes in three color coordinates (ΔL*, Δa* and Δb*) after aging was analyzed by ANOVA (p<0.01).

Results

Measuring mode influenced , ΔL* and Δa* values. There were significant correlations between the color changes measured in the reflectance mode and in the transmittance mode (r=0.91).

Significance

The color changes in the transmittance mode can roughly be estimated based on the reflected color changes.

Keywords: Resin composite, Reflected color, Transmitted color, Accelerated aging

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PII: S0109-5641(06)00029-7

doi:10.1016/j.dental.2006.01.019

Dental Materials
Volume 23, Issue 3 , Pages 259-264, March 2007

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