The presence of the crystals at tooth-restoration interface may be responsible for a decrease in the bond strength between the composite resin and bleached dentin. The effect of elapsed time following bleaching on enamel bond strength of resin composite. SP is an oxidizer in powder form that is stable under dry conditions but breaks down to sodium metaborate, HP, and nascent oxygen in the presence of acid or water [ 15 ].
J Conserv Dent ; Discussion Microshear bond strength has been characterized as the maximum stress that a material subjected to a shearing load can resist before failure. This could be attributed to the partial loss of oxygen diffusion layer at the tooth and composite interface.
YAG laser bleaching and antioxidizing agents on the shear bond strength of brackets. The microshear bond strength of the specimens were calculated and expressed in MPa.
The percentages of the types of bond failure can be measured using a scale such as the Adhesive Remnant Index. This index specifies the amount of cement remaining on the tooth and bracket or band.
However a previous study showed that restorations of both materials were clinically acceptable after 5 years [ 2 ]. The bleach produces oxygen, which inhibits free radical polymerization of resin composites.
Several studies have produced conflicting views,  but generally determined that a safe period for bonding may vary between 24 h and 4 weeks following the bleaching procedure.
Effect of different antioxidants on reversing compromised resin bond strength after enamel bleaching: Some authors reported that preexisting porosity on the tooth surface was increased by a bleaching treatment [ 26 — 28 ].
J Dent Res ; Oper the bond strength was reduced after bleaching treat- Dent ; Open Dent J ; None of the other between-group differences was significant statistically. View at Google Scholar D. However, none of the antioxidant agents were capable of completely neutralizing the deleterious effects of bleaching on the bond strength.
This reduced bond strength could be attributed to the residual oxygen free radicals on the enamel surface.
The results of present in vitro study showed that the microshear bond strength of bonded composites significantly depends on the base type of composite and bleaching affected the composite-enamel shear bond strength. Transdentinal protective role of sodium ascorbate against the cytophatic effects of H2O2 released from bleaching agents.Abstract.
Introduction. This study examined the antioxidant treatment on the shear bond strength of composite resin to enamel after bleaching.
Reduction of resin-enamel bond strength in bleached etched enamel is likely to be caused by a delayed release of oxygen that affects the polymerization of resin components. Keywords carbamide peroxide, sodium ascorbate, microtensile bond strength, ultrastructure.
Effect of various antioxidants on the shear bond strength of composite resin to bleached enamel: and 5% lycopene on the bond strength of composite resin to bleached enamel.
Celik EU, Kaya AD, Arici M. Can the hydrogel form of sodium ascorbate be used to reverse compromised bond strength after bleaching? J Adhes Dent ; In conclusion, dental bleaching did not affect resin-enamel bond strength, regardless of the waiting time to place the restoration after bleaching.
This study investigated the influence of the waiting time for placing resin composite (RC) restorations after dental bleaching on the shear bond strength (SBS) to enamel.
Reversal of Compromised Bonding in Bleached Enamel S.C.N. Lai1, F.R. Tay1*, G.S.P. Cheung1, Reduction of resin-enamel bond strength in bleached etched enamel is likely to be when bonding to carbamide-peroxide-bleached enamel. The compromised bond strengths were effectively reversed when the.
The effect of nonvital bleaching on the shear bond strength of composite resin using three adhesive systems. (). The effect of vital bleaching technique on enamel surface morphology and the bonding of composite resin to enamel.Download