Treatment after bleaching for optimal bonding

Ho-Jin Moon

doi:10.5395/rde.2015.40.2.177

Q.

I am aware of sodium hydroxide treatment after walking bleaching. I wonder, in case of laminate veneering after office or home bleaching, what kind of surface treatment is recommended for successful bonding?

A.

Regardless of bleaching regimes, the bond strength of composite resin or resin cement is reduced when bonding procedure is performed immediately after whitening.1,2,3,4,5,6,7,8,9,10,11,12 It is believed that the polymerization via free-radical mechanism is impeded by nascent oxygen remnant and peroxide in the bleached dental hard tissue.13 Because sodium hydroxide is used as a buffering agent to control the decreased pH, it does not guarantee optimal bonding.5 To handle compromised bond strength of pre-bleached dental hard tissue, use antioxidant like sodium ascorbate.2,5,7,8,9,14,15 As a practical approach, place 10% sodium ascorbate on the bleached surface for 10 minutes with agitation and rinse it with water before bonding.2

Acknowledgement

Readers' forum is edited by Professor Kyung-Mo Cho (Gangneung-Wonju National University).

References

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