Color stability, surface roughness and microhardness of composites submitted to mouthrinsing action.
OBJECTIVE
The purpose of this study was to evaluate the effect of mouth rinse solutions on color stability, surface roughness and microhardness of two composite resins.


METHODS
Fifty test specimens of each composite (Filtek Z250 and Z350; 3M ESPE) were made using a teflon matrix (12x2 mm). Color, surface roughness and Knoop microhardness baseline measurements of each specimen were made and specimens (n=10) were immersed in 5 mouth rinse solutions: G1: distilled water (control), G2: Plax Classic, G3: Plax alcohol-free; G4: Periogard, and G5: Listerine. Final measurements of color, roughness and microhardness were performed and the results submitted to statistical analysis (2-way ANOVA, Bonferroni's test; p<0.05).


RESULTS
The most significant color change was observed for Z250 when immersed in Listerine (p<0.05). Z350 showed greater color change when immersed in Plax alcohol-free (p<0.05), but with no significant difference for Listerine (p>0.05). With regard to roughness, both composites showed significant changes when immersed in Listerine in comparison with Plax alcohol-free (p<0.05). Microhardness of Z350 was shown to be significantly changed when the composite was immersed in Plax alcohol-free (p<0.05).


CONCLUSIONS
Composite changes depended on the material itself rather than the mouth rinse solution used.
Department of Dental Materials and Prosthodontics, Ribeirão Preto School of Dentistry, University of São Paulo, Ribeirão Preto, SP, Brazil.
Marília Salomão Campos Cabrini
MS
Festuccia
Lucas da Fonseca Roberti
Lda F
Garcia
Diogo Rodrigues
DR
Cruvinel
Fernanda de Carvalho Panzeri
Fde C
Pires-De-Souza
D000704:Analysis of Variance; D003116:Color; D003188:Composite Resins; D006245:Hardness Tests; D006801:Humans; D007101:Immersion; D008422:Materials Testing; D009067:Mouthwashes / Q000737:chemistry / Q000494:pharmacology*; D017797:Prosthesis Coloring; D013499:Surface Properties; D013997:Time Factors
D003188:Composite Resins; D009067:Mouthwashes