The influence of bleaching agents on enamel bond strength of a composite resin according to the storage time
The influence of bleaching agents on enamel bond strength of a composite resin according to the storage time
Borges, A.B.; Rodrigues, J.R.; Borges, A.L.S.; Marsílio, A.L.
Rev. odontol. UNESP, vol.36, n1, p.77-83, 2007
Resumo
The purpose of this study was to determine the effect of bleaching agents on shear bond strength of a composite to enamel, after various artificial saliva storage times. The buccal and lingual surfaces of 78 premolars were divided into a control group (n = 12) and three experimental groups (n = 48), according to the bleaching agents used (6.5% hydrogen peroxide; 35% carbamide peroxide; 35% hydrogen peroxide). Specimens of control group were not bleached and were stored for 14 days. After the bleaching treatments, specimens of the experimental groups were divided into four groups (n = 12), according to the storage time (1 day, 1, 2 and 3 weeks). Bonds were performed with Scotchbond MPP / Z-100 and shear bond test was carried out after 24 hours. The data were analyzed by two-way ANOVA, Tukey and Dunnett’s tests (5%). There were no significant differences among the bleaching agents. The bond strength values obtained after three weeks were significant higher than those obtained after the other periods and were similar to those obtained for the control group. External bleaching with the agents tested in this study reduced significantly bond strength of composite resin to enamel. However, bond strengths returned to values similar of those found in control group with a post-bleaching delay of three weeks.
Palavras-chave
Dental bleaching, enamel, adhesion
Abstract
O objetivo deste estudo foi avaliar o efeito de agentes clareadores na resistência adesiva ao esmalte após vários períodos de armazenamento em saliva artificial. Setenta e oito pré-molares, divididos em um grupo controle (n = 12) e três grupos experimentais (n = 48), cujas superfícies vestibulares e linguais foram preparadas de acordo com os agentes utilizados (peróxido de hidrogênio a 6,5%; peróxido de carbamida a 35%; peróxido de hidrogênio a 35%). Os espécimes do grupo controle não foram clareados e permaneceram estocados por 14 dias. Após os tratamentos clareadores, os espécimes dos grupos experimentais foram divididos em quatro grupos (n = 12), de acordo com o tempo de armazenamento (1 dia, 1, 2 e 3 semanas). Foram confeccionados cilindros em resina composta e realizado o ensaio de cisalhamento após 24 horas. Os resultados foram analisados pelos testes ANOVA 2 critérios, Tukey e Dunnett (5%). Não houve diferença significante entre os agentes clareadores. Os valores de resistência ao cisalhamento obtidos após três semanas foram significantemente maiores do que os obtidos após os outros períodos e similares aos do grupo controle. O clareamento dentário externo, considerando os materiais testados neste estudo, reduziu significantemente a resistência adesiva da resina composta ao esmalte, porém os valores de resistência adesiva apresentaram-se semelhantes aos achados quando o esmalte não foi clareado após o período de três semanas de armazenamento em saliva artificial.
Keywords
Dental bleaching, enamel, adhesion
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