Dental Materials
Volume 22, Issue 7 , Pages 653-660, July 2006

Changes in opalescence and fluorescence properties of resin composites after accelerated aging

  • Yong-Keun Lee

      Affiliations

    • Department of Dental Biomaterials Science, Dental Research Institute, College of Dentistry, Seoul National University, Seoul, South Korea
    • Corresponding Author InformationCorresponding author. Tel.: +82 2 740 8693; fax: +82 2 740 8694.
    • ,
  • Huan Lu

      Affiliations

    • Department of Restorative Dentistry and Biomaterials, Houston Biomaterials Research Center, The University of Texas Dental Branch at Houston, Houston, TX, USA
    • ,
  • 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 13 May 2005; received in revised form 29 June 2005; accepted 23 August 2005.

Summary 

Objectives

Opalescence and fluorescence properties and the correlated translucency and masking effect of resin composites may change after aging. The objective of this study was to determine the changes in opalescence and fluorescence properties of resin composites after accelerated aging for 150kJ/m2. Changes in translucency and masking effect were also determined.

Methods

Color and spectral distribution of seven resin composites (A2 shade, 1-mm thick) were measured in the reflectance and transmittance modes under ultraviolet light (UV)-included and excluded conditions. Opalescence parameter (OP) was calculated as the difference in yellow–blue (Δb*) and red-green (Δa*) coordinates between the reflected and transmitted colors under UV-included and excluded conditions. For the fluorescence evaluation, color differences (FL-Ref and FL-Trans) by the inclusion or exclusion of the UV-component of the standard illuminant D65 in the reflectance and transmittance modes were calculated. Under UV-included and excluded conditions, the translucency parameter (TP) was calculated, and the masking effect (ME) was calculated as the color difference between a specimen over a black tile and black tile itself. Repeated-measures 2-way analysis of variance at the significance level of 0.05 was performed for the values before and after aging.

Results

OP values in UV-included and excluded conditions did not change significantly after aging. FL-Ref and FL-Trans, TP values and ME values in UV-included and excluded conditions changed significantly after aging (p<0.05). The ranges of changes after aging in ΔE*ab units were: OP, −0.50 to 0.74; FL, −1.19 to 0.15; TP, −1.37 to 0.13; and ME, −0.49 to 0.33.

Significance

Opalescence of resin composites did not change but fluorescence was not detected after accelerated aging for 150kJ/m2. Translucency and masking effect changed significantly after aging.

Keywords: Opalescence, Fluorescence, Translucency, Masking effect, Resin composite, Accelerated aging

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PII: S0109-5641(05)00242-3

doi:10.1016/j.dental.2005.08.004

Dental Materials
Volume 22, Issue 7 , Pages 653-660, July 2006

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