Effects of specular component on color differences of different filler type resin composites after aging.
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 Sigma (Sigma: 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 Sigma and XT; however, a* and b* were depended on brands and shades. Comparing 1-week and 1-year values, DeltaE*ab ranged 1.5 (A3 and B3)-2.9 (Inc) with SCI and 1.4 (A3)-2.9 (Inc) with SCE for Sigma, and 1.1 (A3D)-7.1 (Clear) with SCI and 1.4 (A3D)-7.6 (Clear) with SCE for XT. The values of DeltaE*ab with SCE were higher than those of SCI for all shades of XT; however, for Sigma, the differences varied with shades.


CONCLUSIONS
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.
Hosoya
Yumiko
Y
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. hosoya@nagasaki-u.ac.jp
Shiraishi
Takanobu
T
Oshiro
Maki
M
Ando
Susumu
S
Miyazaki
Masashi
M
Powers
John M
JM
D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D008027:Light; D017797:Prosthesis Coloring / Q000592:standards*; D013053:Spectrophotometry / Q000379:methods; D013057:Spectrum Analysis; D013997:Time Factors
D003188:Composite Resins; D003764:Dental Materials; C507124:Estelite sigma; C474035:Filtek Supreme