CHANGE OF OPTICAL PROPERTIES OF CONTEMPORARY RESIN COMPOSITES AFTER ONE WEEK AND ONE MONTH WATER AGING
This is very interesting and dentist doing composites should take this into consideration. MJ
Available online 10 April 2013
Abstract
Objectives
To
compare color and translucency changes after water-aging for 1-week and
1-month in light and dark shades of contemporary polychromatic resin
composites.
Methods
Enamel (e)
and dentin (d), light and dark (A1 and A4 or equivalents) shades were
selected from the composites Enamel-Plus HRi/Micerium, Miris-2/Coltene,
IPS Empress-Direct/Ivoclar and Filtek-Supreme/3 M ESPE and light and
dark shades from the TPH-Spectum/Densply monochromatic composite. Five
disks (d = 10 mm, h = 1 mm) per material, enamel/dentin and light/dark
shade were prepared. A colorimetric evaluation, over white and black
background, according to the CIELab system was performed just
after preparation and after 1-week and 1-month dark water-storage at
37 °C. Color (ΔEab) and translucency (ΔTP) differences were calculated.
Results were analyzed by ANOVA and Scheffe's test, paired t-test and
linear regression analysis (a = 0.05).
Results:1-week
water-aging provided a wide range of ΔΕab values (0.79Filtek(e)/D2 -
5.19 Filtek(d)/A1) and ΔTP values (-2.74 Hri/UD1 - 1.03 TPH/A1). After
1-month water-aging ΔΕab ranged from 1.09 Filtek(e)/D2 to 7.94
Filtek(d)/A1 and ΔTP values from -2.71Hri/UD1 to 1.07 Filtek(d)/A4.
Significant changes in ΔΕab between 1-week and 1-month water-aging were
noted for Filtek and Miris dentin and Miris light enamel shades. As for
ΔTP, significant difference was recorded only for IPS(e)/A4. ΔΕab was
significantly correlated with ΔL, Δα, Δb and ΔTP after 1-week and with ΔL and Δα after 1-month aging.
Conclusions
Water-aging
caused remarkable color changes, which were material and shade
depended. Thirteen out of eighteen of the tested composites exhibited
clinically perceptible (ΔΕab > 2.6) color changes even after short
water-aging period.
Comments