Color and opacity of composites protected with surface sealants and submitted to artificial accelerated aging.
OBJECTIVE
To evaluate the color similarity, stability and opacity of composites (TPH, Charisma, and Concept, shade A2) protected with surface sealants (Fortify Plus and Biscover) and cyanoacrylate (Super Bonder).


METHODS
Forty specimens of each composite were made and separated into 4 groups (n=10) according to the surface protection: GI - without sealant; GII - cyanoacrylate; GIII - Fortify Plus; GIV - Biscover. Color and opacity readings were taken before and after Artificial Acelerated Aging (AAA) and the values obtained for color stability were submitted to statistical analysis by 2-way ANOVA and Bonferroni's test (P<.05). The values acquired for color similarity were submitted to 1-way ANOVA and Tukey's test (P<.05). The specimen sufaces were compared before and after AAA using Scanning Electronic Microscopy (SEM).


RESULTS
Studied composites did not present the same values for the coordinates L*, a* and b * before AAA, indicating that there was no color similarity among them. All composites presented color alteration after AAA with clinically unacceptable values. Protected groups presented lower opacity variation after AAA, in comparison with the control goup. SEM evaluation demonstrated that AAA increased the surface irregularities in all of the studied groups.


CONCLUSIONS
Surface sealants were not effective in maintaining composite color, but were able to maintain opacity.
Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo. Av do Café, s/nº - Monte Alegre - 14040-904 - Ribeirao Preto - SP - Brazil.
Fabiano Gamero
FG
Aguilar
Lucas da Fonseca
Lda F
Roberti Garcia
Diogo Rodrigues
DR
Cruvinel
Ana Beatriz Silva
AB
Sousa
Fernanda
F
de Carvalho Panzeri Pires-de-Souza