Influence of artificial accelerated aging on the color stability and opacity of composites of different shades.
OBJECTIVE
The aim of this study was to evaluate the influence of artificial accelerated aging on the color stability and opacity of composites of different shades.


METHODS
Four composites for direct use (Heliomolar, 4 Seasons, Tetric EvoCeram; QuiXfil) and one for indirect use (SR Adoro) in two shades were used: light (A2) and dark (C3 for direct, and D4 for indirect composite). QuiXfil was obtained in Universal shade. A Teflon matrix (12 X 2 mm) was used to obtain 54 specimens (N=6), which were submitted to color and opacity analysis (Spectrophotometer PCB 6807, Byk Gardner) before and after artificial accelerated aging for 384 hours.


RESULTS
After the statistical analysis (2-way ANOVA - Bonferroni - P<0.05), significant color alteration was observed in the light and dark composites studied (P<0.05), with the exception of QuiXfil. Composite 4 Seasons/C3 showed less color alteration (ΔE=0.91). The opacity alteration (ΔOP) was higher for light composites.


CONCLUSIONS
Artificial accelerated aging interfered in the optical properties assessed; however, the alterations seemed to be more related to the composites composition than to their shade.
Ribeirao Preto School of Dentistry, University of São Paulo, Ribeirao Preto, SP, Brazil. ferpanzeri@forp.usp.br
F M
FM
Mundim
L
L
Da Fonseca Roberti Garcia
A B
AB
Silva Sousa
D R
DR
Cruvinel
F
F
De Carvalho Panzeri Pires-De-Souza
D003116:Color; D003188:Composite Resins; D008422:Materials Testing; D013997:Time Factors
D003188:Composite Resins