shear bond strength after dentin bleaching with 10% carbamide peroxide agents resistência ao cisalhamento da dentina após clareamento com peróxido de carbamida a 10%

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2004
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Abstract
This in vitro study evaluated the shear bond strength (SBS) of dentin treated with two 10% carbamide peroxide bleaching agents 15 days after bleaching and storage in artificial saliva. Dentin fragments were randomly divided into 3 groups (n = 20) for the treatment with the two different bleaching agents (Rembrandt 10% or Opalescence 10%) or with a placebo agent, applied to the tooth surface for 8 hours a day. During the remaining time, the specimens were stored in artificial saliva. After 42 days, the fragments were stored in artificial saliva for 14 days. Another group (n = 20) was exposed to distilled and deionized water for 56 days. An adhesive system and microhybrid composite resin were used to prepare specimens for the SBS test. SBS tests were performed and the fractured surfaces were visually examined using a stereoscope at 30 X magnification. The analysis of variance (ANOVA) and SIDAK tests showed higher SBS values for dentin treated with Opalescence 10% than for dentin treated with Rembrandt 10% or placebo. Groups treated with Rembrandt 10%, Opalescence 10% or placebo did not differ from the group treated with distilled and deionized water. Ten percent carbamide peroxide agents or a placebo agent caused no differences in SBS of dentin after 15 days of storage in artificial saliva.
Este estudo in vitro avaliou a resistência ao cisalhamento da dentina submetida ao tratamento com dois agentes clareadores contendo peróxido de carbamida a 10% depois de 15 dias de clareamento e armazenagem em saliva artificial. Fragmentos de dentina foram aleatoriamente distribuídos em 3 grupos (n = 20) para receber o tratamento com dois diferentes agentes clareadores (Rembrandt a 10% ou Opalescence a 10%) ou com um agente placebo, aplicados na superfície dental por 8 horas diárias. No restante do tempo, os espécimens permaneceram imersos em saliva artificial. Após o tratamento por 42 dias, os fragmentos foram armazenados em saliva artificial por 14 dias. Outro grupo (n = 20) somente recebeu a aplicação de água destilada e deionizada por 56 dias. Um sistema adesivo e uma resina composta microhíbrida foram utilizados para o preparo dos corpos-de-prova para o teste de cisalhamento. Após os ensaios, a superfície foi examinada visualmente com um estereoscópio com aumento de 30 X. A análise de variância (ANOVA) e o teste SIDAK mostraram que a dentina tratada com Opalescence a 10% apresentou maiores valores de resistência ao cisalhamento do que a tratada com o Rembrandt a 10% ou com o agente placebo. Os grupos tratados com Rembrandt a 10%, Opalescence a 10% ou agente placebo não diferiram do grupo que recebeu somente o tratamento com água destilada e deionizada. Agentes clareadores contendo peróxido de carbamida a 10% ou um agente placebo não alteraram a resistência ao cisalhamento da dentina após 15 dias de imersão em saliva artificial.
Reference Key
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Authors ;Roberta Tarkany Basting;Patrícia Moreira de Freitas;Luiz André Freire Pimenta;Mônica Campos Serra
Journal journal of information and computational science
Year 2004
DOI
10.1590/S1806-83242004000200013
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-83242004000200013
Keywords
saliva dentin

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