Can intra-coronally bleached teeth be bonded safely after antioxidant treatment?

Abstract

The aim of this study was to compare the effects of antioxidant treatment and delayed bonding, following intra-coronal bleaching, on the shear bond strength (SBS) and bond failure site of brackets bonded to enamel. Eighty mandibular incisors were divided into four equal groups. After root canal filling, specimens in Group 1 were used as control and not bleached. For experimental groups 2 to 4, bleaching agent was placed into the rest of the cavity for a four-day period and this bleaching treatment was performed two times. In Group 2, specimens were bonded immediately after bleaching; in Group 3, specimens were bleached and then immersed in artificial saliva for 30 days before bonding; in Group 4, specimens were bleached, treated with an antioxidant agent, and then bonded. The SBS values of bonded brackets were measured in megapascal (MPa), while adhesive remnant index (ARI) scores were determined after the brackets failed. The SBS values of Group 1 (mean: 20.3±7.1 MPa) and Group 4 (mean: 18.2±6.1 MPa) were significantly higher (p>0.001) than those of Group 2 (mean: 4.9±3.2 MPa) and Group 3 (mean: 8.7±4.9 MPa). No significant differences in SBS were found between Groups 1 and 4, and between Groups 2 and 3.

Effects of different intracoronal bleaching methods on shear bond strengths of orthodontic brackets

“…They suggested that lower SBS could be due to changes in enamel structure resulting from increased porosity or reduction of the microhardness of dentin and enamel by the loss of calcium. In agreement with Uysal et al, 12,13 lower SBS in all bleaching groups was observed in the present study.…”

“…12,13 In both of these studies, Uysal et al 12,13 reported that intracoronal bleaching with 16% carbamide peroxide adversely affected the SBS of brackets bonded immediately after bleaching or 30 days after bleaching. They suggested that lower SBS could be due to changes in enamel structure resulting from increased porosity or reduction of the microhardness of dentin and enamel by the loss of calcium.…”

Effect of Epigallocatechin Gallate on shear bond strength of composite resin to bleached enamel: anin vitrostudy

“…One of the most common techniques to restore bond strength after bleaching procedures is to delay the bonding procedure after bleaching 7. Another technique to avoid such a delay and enable immediate bonding after bleaching procedures is to apply antioxidative agents.…”

O ascorbato de sódio promove a resistência de união após técnicas de clareamento dental?

“…Most studies, which tested the effectiveness of AS in reversing compromised bond strengths, used carbamide peroxide at low concentrations [5,[7][8][9][10][11][12][13][14][15][16]20,21,25,[28][29][30]33]. It is possible that SA was more effective in teeth bleached with carbamide peroxide due the hydrogen peroxide releases a high oxygen concentration [37].…”