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Type: Artigo de periódico
Title: Effect of Bleaching Treatment and Reduced Application Time of an Antioxidant on Bond Strength to Bleached Enamel and Subjacent Dentin
Author: Lima, AF
Fonseca, FMD
Freitas, MS
Palialol, ARM
Aguiar, FHB
Marchi, GM
Abstract: Purpose: To evaluate the influence of bleaching on bond strength to enamel and subjacent dentin, and to determine whether a reduced application time (1 min) of the antioxidizing agent can obviate the compromised bond strength after bleaching. Materials and Methods: One hundred twelve bovine incisors were obtained, and the enamel and dentin surfaces were standardized to a thickness of 1 mm. The specimens were divided into two control groups (enamel and dentin without treatment) and 12 experimental groups (n = 10), based on the concentration of bleaching agents (carbamide peroxide 16% and hydrogen peroxide 35%), time interval between bleaching and restorative procedures (24 h; 24 h + sodium ascorbate (SA) 10%/1 min; 14 days), and substrate (enamel or dentin). All samples were submitted to the bleaching treatment on enamel. After the stipulated interval, a microshear test was performed. Results: The bleaching treatment compromised the bond strength to the enamel when the restoration was performed 24 h after the end of bleaching. The bond strength to dentin was not affected by bleaching. Conclusions: The SA 10% application for 1 min obviates the detrimental effect of bleaching on bond strength. The bleaching performed on enamel does not affect the bond strength to the subjacent dentin.
Subject: tooth bleaching
carbamide peroxide
hydrogen peroxide
bond strength
sodium ascorbate
adhesive system
Country: EUA
Editor: Quintessence Publishing Co Inc
Citation: Journal Of Adhesive Dentistry. Quintessence Publishing Co Inc, v. 13, n. 6, n. 537, n. 542, 2011.
Rights: aberto
Identifier DOI: 10.3290/j.jad.a19813
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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