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CC BY-NC-ND 4.0 · Eur J Dent 2011; 05(02): 143-149
DOI: 10.1055/s-0039-1698871
Original Article
Dental Investigation Society

Bleaching Agent Action on Color Stability, Surface Roughness and Microhardness of Composites Submitted to Accelerated Artificial Aging

Raphael Mendes Bezerra Rattacaso
a   Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
,
Lucas de Fonseca Roberti Garcia
b   Department of Restorative Dentistry, Dental Materials Area, Dental School of Piracicaba, State University of Campinas, Piracicaba, SP, Brazil.
,
Fabiano Gamero Aguilar
c   Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
,
Simonides Consani
d   Department of Restorative Dentistry, Dental Materials Area, Dental School of Piracicaba, State University of Campinas, Piracicaba, SP, Brazil.
,
Fernanda de Carvalho Panzeri Pires-de-Souza
e   Department of Dental Materials and Prosthodontics, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, Brazil.
› Author Affiliations
Further Information

Publication History

Publication Date:
30 September 2019 (online)

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ABSTRACT

Objectives: The purpose of this study was to evaluate the bleaching agent action on color stability, surface roughness and microhardness of composites (Charisma, Filtek Supreme and Heliomolar - A2) submitted to accelerated artificial aging (AAA). Methods: A Teflon matrix (12 x 2 mm) was used to fabricate 18 specimens (n=6) which, after polishing (Sof-Lex), were submitted to initial color reading (ΔE), Knoop microhardness (KHN) (50 g/15 s load) and roughness (Ra) (cut-off 0.25 mm) tests. Afterwards, the samples were submitted to AAA for 384 hours and new color, microhardness and roughness readings were performed. After this, the samples were submitted to daily application (4 weeks) of 16% Carbamide Peroxide (NiteWhite ACP) for 8 hours and kept in artificial saliva for 16 hours. New color, microhardness and roughness readings were made at the end of the cycle, and 15 days after bleaching. Results: Comparison of the ΔE means (2-way ANOVA, Bonferroni, P<.05) indicated clinically unacceptable color alteration for all composites after AAA, but without significant difference. Statistically significant increase in the KHN values after AAA was observed, but without significant alterations 15 days after bleaching. For Ra there was no statistically significant difference after AAA and 15 days after bleaching. Conclusions: The alterations promoted by the bleaching agent and AAA are material dependent. (Eur J Dent 2011;5:143-149)

Key words:

Bleaching agent - Accelerated aging - Color stability - Microhardness - Surface roughness
 

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