Effects of specular component on color differences of different filler type resin composites after aging

Hosoya, Yumiko; Shiraishi, Takanobu; Oshiro, Maki; Ando, Susumu; Miyazaki, Masashi; Powers, John M.

doi:10.1016/j.jdent.2009.03.018

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Volume 37, Issue 8 , Pages 585-590, August 2009

Effects of specular component on color differences of different filler type resin composites after aging

Yumiko Hosoya
- Department of Pediatric Dentistry, Course of Medical and Dental Science, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1, Sakamoto, Nagasaki 852-8588, Japan
- Corresponding author. Tel.: +81 95 819 7673; fax: +81 95 819 7676.
Takanobu Shiraishi
- Department of Dental and Biomedical Materials Science, Course of Medical and Dental Science, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1, Sakamoto, Nagasaki 852-8588, Japan
Maki Oshiro
- Department of Operative Dentistry, Nihon University School of Dentistry, 1-8-13, kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan
Susumu Ando
- Department of Operative Dentistry, Nihon University School of Dentistry, 1-8-13, kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan
Masashi Miyazaki
- Department of Operative Dentistry, Nihon University School of Dentistry, 1-8-13, kanda-Surugadai, Chiyoda-ku, Tokyo 101-8310, Japan
John M. Powers
- Department of Restorative Dentistry and Biomaterials, University of Texas Dental Branch at Houston, Houston, TX, USA

Received 3 March 2009; received in revised form 24 March 2009; accepted 24 March 2009. published online 06 April 2009.

Abstract

Objective

This study evaluated the effects of specular component mode of specular component excluded (SCE) and specular component included (SCI) on color changes of different filler type resin composites after aging of 1 week and 1 year.

Methods

Resin composites and shades used in this study were submicron-filled Estelite Σ (Σ: Inc, A2, A3, B3, C2, OA2, OA3) and nanofilled Filtek Supreme XT (XT: Clear, A2E, A2B, A3B, C2B, A2D, A3D). Resin disks of 2mm in thickness and final polish with 2400-grit silicon carbide paper were stored in 100% relative humidity. One-week and 1-year after curing, the colors of the composite disks were measured with a spectrophotometer in SCI and SCE modes.

Results

For both 1-week and 1-year specimens, the values of L* with SCI were significantly higher than SCE for all shades of Σ and XT; however, a* and b* were depended on brands and shades. Comparing 1-week and 1-year values, ΔE*ab ranged 1.5 (A3 and B3)–2.9 (Inc) with SCI and 1.4 (A3)–2.9 (Inc) with SCE for Σ, and 1.1 (A3D)–7.1 (Clear) with SCI and 1.4 (A3D)–7.6 (Clear) with SCE for XT. The values of ΔE*ab with SCE were higher than those of SCI for all shades of XT; however, for Σ, the differences varied with shades.

Conclusion

Specular component mode (SCE vs. SCI) significantly influenced L* values; however, the color differences affected by aging were dependent on brands and shades of the resin composites tested.

Keywords: Specular component mode, SCI, SCE, Color difference, Resin composites, Resin shades