Influence of 10% sodium ascorbate gel application time on composite bond strength to bleached enamel.

Autor:	Murad CG; Department of Restorative Dentistry, School of Dentistry, University North of ParanáLondrinaPRBrazil.; Department of Restorative Dentistry, School of Dentistry, UNICESUMARMaringáPRBrazil., de Andrade SN; Department of Restorative Dentistry, School of Dentistry, University North of ParanáLondrinaPRBrazil., Disconzi LR; Department of Restorative Dentistry, School of Dentistry, University North of ParanáLondrinaPRBrazil., Munchow EA; Department of Restorative Dentistry, School of Dentistry, Federal University of PelotasPelotasRSBrazil., Piva E; Department of Restorative Dentistry, School of Dentistry, Federal University of PelotasPelotasRSBrazil., Pascotto RC; Department of Dentistry, School of Dentistry, State University of MaringáMaringáPRBrazil., Moura SK; Department of Restorative Dentistry, School of Dentistry, University North of ParanáLondrinaPRBrazil.
Jazyk:	angličtina
Zdroj:	Acta biomaterialia odontologica Scandinavica [Acta Biomater Odontol Scand] 2016 Mar 04; Vol. 2 (1), pp. 49-54. Date of Electronic Publication: 2016 Mar 04 (Print Publication: 2016).
DOI:	10.3109/23337931.2016.1152901
Abstrakt:	Objective To analyze bond strength to bleached enamel following application of 10% sodium ascorbate gel. Material and methods Forty third molars were allocated into five groups ( n = 8): GP - unbleached specimens restored with composite resin; GN - specimens restored immediately after bleaching; and G15; G30 and G60 (test groups) - bleached specimens treated with 10% sodium ascorbate gel for 15, 30 and 60 min before restoration. The teeth were sectioned and the buccal and lingual faces were restored. After storage in distilled water (37 °C/24 h), sticks of ±0.8 mm 2 were tested in tensile (0.5 mm/min). Fractures were observed and classified. Data (in MPa) were analyzed with one-way ANOVA and Tukey tests ( α = 0.05). Results No differences were found among GP (26 ± 6.0), G15 (23 ± 7.3), G30 (25 ± 6.1) and G60 (25 ± 5.1), with GN (15 ± 5.5) showing the lowest bond strength ( p < 0.0001). Conclusion The application of 10% sodium ascorbate gel for 15 min after bleaching with 37.5% hydrogen peroxide restored the bonding to enamel. Competing Interests: The authors report no conflict of interest. All the content and writing of this manuscript is the responsibility of the authors.
Databáze:	MEDLINE
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