Event Title

THE EFFECT OF 35% SODIUM ASCORBATE ON MICROTENSILE BOND STRENGTH OF COMPOSITE RESIN IMMEDIATELY AFTER BLEACHING

Location

Resnick Auditorium

Start Date

14-2-2014 12:00 AM

Description

Objective. to assess the effect of 35% sodium ascorbate (SA) on microtensile bond strength of dentin immediately after bleaching with 35% hydrogen peroxide. Background. Bonding strength of composite restoration to tooth structure is significantly reduced when it's done immediately after bleaching. A delay of the bonding procedure is recommended. Some studies have investigated the possibility of using antioxidants treatment to allow for immediate bonding. Sodium ascorbate is one agent that has potentials to improve the bonding. Methods. Twenty-five sound human 3rd molars were collected in order to obtain one 125 specimens. Teeth were randomly divided into five groups (n=5): Grp1 (bleaching + immediate restoration), Grp2 (bleaching + delayed restoration), Grp3 (bleaching + SA + immediate restoration), Grp4 (bleaching + SA + delayed restoration), Grp5 (Control-no treatment). After bleaching, but prior to restoration, Grps 2 & 4 were stored for 1 week in deionized water at 37°C. All samples were restored using Optibond Solo Plus (Kerr) and Filtek Z250 (3M/Espe) following manufacturers' instructions. Teeth were sectioned into 1x1x8mm bars and microtensile bond strength was measured with a universal testing machine (Instron 8841) at a crosshead speed of 1.0mm/min. Results. Grp5 (control) showed significantly higher microtensile bond strength (37.18 ± 17.40) than Grp1 (25.83 ± 9.11), Grp2 (20.33 ± 7.06), Grp3 (26.98 ± 11.55) and Grp4 (22.48 ± 11.71). Comparison of the groups indicates that Grp3 exhibited slightly higher microtensile bond strength than Grp4, however this was not statistically significant. Conclusion. Restorations without bleaching or SA showed the highest microtensile bond strength. Microtensile bond strength improved after the application of 35% SA when restoring immediately after bleaching, but it was not statistically significant when compared to the delayed restoration. Grants. Funded by the HPD Research Committee.

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Feb 14th, 12:00 AM

THE EFFECT OF 35% SODIUM ASCORBATE ON MICROTENSILE BOND STRENGTH OF COMPOSITE RESIN IMMEDIATELY AFTER BLEACHING

Resnick Auditorium

Objective. to assess the effect of 35% sodium ascorbate (SA) on microtensile bond strength of dentin immediately after bleaching with 35% hydrogen peroxide. Background. Bonding strength of composite restoration to tooth structure is significantly reduced when it's done immediately after bleaching. A delay of the bonding procedure is recommended. Some studies have investigated the possibility of using antioxidants treatment to allow for immediate bonding. Sodium ascorbate is one agent that has potentials to improve the bonding. Methods. Twenty-five sound human 3rd molars were collected in order to obtain one 125 specimens. Teeth were randomly divided into five groups (n=5): Grp1 (bleaching + immediate restoration), Grp2 (bleaching + delayed restoration), Grp3 (bleaching + SA + immediate restoration), Grp4 (bleaching + SA + delayed restoration), Grp5 (Control-no treatment). After bleaching, but prior to restoration, Grps 2 & 4 were stored for 1 week in deionized water at 37°C. All samples were restored using Optibond Solo Plus (Kerr) and Filtek Z250 (3M/Espe) following manufacturers' instructions. Teeth were sectioned into 1x1x8mm bars and microtensile bond strength was measured with a universal testing machine (Instron 8841) at a crosshead speed of 1.0mm/min. Results. Grp5 (control) showed significantly higher microtensile bond strength (37.18 ± 17.40) than Grp1 (25.83 ± 9.11), Grp2 (20.33 ± 7.06), Grp3 (26.98 ± 11.55) and Grp4 (22.48 ± 11.71). Comparison of the groups indicates that Grp3 exhibited slightly higher microtensile bond strength than Grp4, however this was not statistically significant. Conclusion. Restorations without bleaching or SA showed the highest microtensile bond strength. Microtensile bond strength improved after the application of 35% SA when restoring immediately after bleaching, but it was not statistically significant when compared to the delayed restoration. Grants. Funded by the HPD Research Committee.