Influence of artificial accelerated aging on the color stability and opacity of composites of different shades.

Autor:	Mundim FM; Ribeirao Preto School of Dentistry, University of São Paulo, Ribeirao Preto, SP, Brazil. ferpanzeri@forp.usp.br, Da Fonseca Roberti Garcia L, Silva Sousa AB, Cruvinel DR, De Carvalho Panzeri Pires-De-Souza F
Jazyk:	angličtina
Zdroj:	Minerva stomatologica [Minerva Stomatol] 2010 Oct; Vol. 59 (10), pp. 535-41.
Abstrakt:	Aim: 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. Conclusion: 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.
Databáze:	MEDLINE
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