Acta Biomaterialia Odontologica Scandinavica (Dec 2016)

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

  • Cintia Gaio Murad,
  • Suellen Nunes de Andrade,
  • Lucio Ramos Disconzi,
  • Eliseu Aldrighi Munchow,
  • Evandro Piva,
  • Renata Correa Pascotto,
  • Sandra Kiss Moura

DOI
https://doi.org/10.3109/23337931.2016.1152901
Journal volume & issue
Vol. 2, no. 1
pp. 49 – 54

Abstract

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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 mm2 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.

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