Effect of different sodium ascorbate 10% viscosities on composite resin-enamel bond strength after bleaching: an in-vitro study

Description :

The interest in aesthetic dentistry has increased the demand for cosmetic treatments, and dental discoloration has become one of the major concerns among patients regarding the aesthetics of their smiles. Vital tooth bleaching is a popular option among the multiple treatment strategies available to respond to this demand because it is conservative, well-accepted, and relatively safe. After bleaching, the presence of residual oxygen free radicals in enamel interferes with the polymerization of resin-based materials, resulting in a decrease of the bond strength. This adverse effect is naturally reversed in a period varying from 24h to 3 weeks, and a minimum delay of 14 days has been suggested before performing any adhesive procedure. Nonetheless, such delay may result clinically inconvenient since patients frequently require restorative treatments after bleaching. Consequently, the use of antioxidant agents to reverse this side effect has been suggested to allow immediate adhesive procedures to be performed. The definition of an optimal sodium ascorbate viscosity after bleaching will be of great clinical consideration when bonding of resin-based materials to bleached enamel.