Effect of different concentrations of carbamide peroxide on microhardness of dental ceramics

Autor(es)

Ourique, Sergio A. M. ^[1] ; Magdaleno, Jovana P. S. ; Arrais, Cesar A. G. ^{[1, 2]} ; Rodrigues, Jose A. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Guarulhos Univ UnG, Grad Studies Div, Guarulhos, SP - Brazil

^[2] Guarulhos Univ UnG, Dept Restorat Dent, Dent Res Div, Guarulhos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: AMERICAN JOURNAL OF DENTISTRY; v. 24, n. 1, p. 57-59, FEB 2011.
• Citações Web of Science: 1

Resumo

Purpose: To evaluate the effect of 10% and 16% carbamide peroxide bleaching agents on microhardness of dental ceramics after different periods of bleaching treatment. Methods: 15 specimens with 5 x 3 x 1 mm(3) were created with four dental ceramics following manufacturers' instructions: IPS Classic (Ivoclar-Vivadent); IPS d.Sign (Ivoclar-Vivadent); EX3 (Noritake); VMK-95 (Vita). A microhardness tester with a Knoop diamond with a 100 g load was used to evaluate the baseline microhardness values of all ceramics. Afterwards, the specimens were submitted to 6-hour daily bleaching treatments with 10% or 16% carbamide peroxide (Whiteness Perfect - FGM) for 21 days, while control groups from each ceramic system were maintained in artificial saliva. The microhardness of all groups was evaluated at 18, 42, 84, and 126 hours of bleaching treatment. The mean value of five indentations performed at each specimen in each time was obtained and all data were submitted to two-way repeated measures ANOVA and Tukey's post-hoc test (alpha=0.05). Results: No significant differences in ceramic microhardness were observed among either bleaching intervals or bleaching treatments. Ceramic restorations are not affected by carbamide peroxide 10% or 16% gel during bleaching treatment. (Am J Dent 2011;24:57-59). (AU)

• Processo FAPESP: 07/03365-9 - Efeito de agentes clareadores sobre a microdureza de cerâmicas dentais
• Beneficiário: Jovana Pontes da Silva Magdaleno
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 04/01175-0 - Efeito in vitro e in situ de diferentes sistemas clareadores caseiros sobre a microdureza do esmalte dental humano e efetividade clínica
• Beneficiário: José Augusto Rodrigues
• Modalidade de apoio: Auxílio à Pesquisa - Regular