Effect of sodium ascorbate on the bond strength of silorane and methacrylate composites after vital bleaching

Abstract

Effect of sodium ascorbate on the bond strength of silorane and methacrylate composites after vital bleaching Abstract: We investigated the effect of sodium ascorbate (SA) on the microtensile bond strengths (MTBSs) of different composites to bovine enamel after vital bleaching with hydrogen peroxide (HP) or carbamide peroxide (CP). Thirty bovine incisors were randomly divided into five groups and treated with no bleaching application (control), 35% HP alone, 35% HP + 10% SA for 10 minutes (HP + SA), 16% CP alone, or 16% CP + 10% SA for 10 minutes (CP + SA). Specimens were restored with Silorane adhesive and Filtek Silorane composite (designated as S / group) or with Clearfil SE bond and Filtek Supreme XT (designated as F / group). Composite build-up was created on the enamel. Sectioned specimens (n = 10 per group; 1 mm² cross-sectional area) were created and stressed in a universal testing machine at 1 mm/min crosshead speed. The application of 10% SA immediately after bleaching with 16% CP or 35% HP increased the enamel MTBS, regardless of the adhesive / composite resin used. The resulting MTBS values were similar to those of the control groups. Use of 16% CP and 35% HP alone decreased the enamel MTBS, regardless of the adhesive / composite resin used, with F / CP + SA = F / HP + SA = F / CP = S / CP + SA = S / HP + SA = S / C > S / CP = S / HP = F / CP = F / HP (p < 0.05). We concluded that the application of SA for 10 minutes immediately after vital bleaching increases the enamel BS for dimethacrylate-and silorane-based composites.

Sodium ascorbate use in bleached teeth

“…Already Güler et al [34] emphasize that the SA performance will vary according to the composition of the bond system. Türkün and Kaya [15] found that the resistance values obtained after the AS application are similar to bleached teeth with an interval of one week after bleaching and teeth restored immediately have low bond strength values.…”

“…Freire et al [30] claim that, in an appropriate concentration, SA 10% facilitates rapid elimination of residual peroxide to two minutes after the bleaching with HP 35%, while Güler et al [34] say that the application of this should give for about 10 minutes, time estimated also by Suneetha et al [3] However, Whang and Shin [29], say one minute would be enough for the agent›s action. Despite the differences, which may be due to the methodology used in each study, all these authors indicate that professionals can carry adhesive procedures after the bleaching procedure provided the correct protocol application to be followed.…”

“…Thereafter, the tooth surface must be washed with water for removal of the product. It should also be out, with regard to the product application time, this has shown differences in the literature, being appointed as effective 10 minutes applications [30,34,37] to 1 minute [30].…”

Composite resin shear bond strength on bleached dentin increased by 35% sodium ascorbate application

“…11 Previous research has shown that up to ten minutes' application of 10% sodium ascorbate is effective in increasing the shear bond of composite resin in bleached teeth by 15-35% carbamide peroxide. [12][13][14] Carbamide peroxide is the material commonly used for extra coronal bleaching on vital teeth. In intracoronal bleaching, the most commonly used material is 35% H 2 O 2 .…”

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].…”