Effect of Sodium Ascorbate and Ascorbic Acid Hydrogels on Microleakage of Composite Restorations after an Office Bleaching Protocol

Authors

  • Ricardo Sgura Departament of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo
  • Fernando Taddeo Departament of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo
  • Natallia Coelho de Moura Departament of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo
  • Celiane Mary Carneiro Tapety Dentistry Course, Federal University of Ceará
  • Ezequias Costa Rodrigues Júnior Dentistry Course, Federal University of Ceará
  • Igor Studart Medeiros Departament of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo

DOI:

https://doi.org/10.11606/issn.2357-8041.v20i1p4-9

Keywords:

Materiais Dentários, Dentística

Abstract

Aim. This work evaluated the influence of 20% sodium ascorbate (SA) and 10% ascorbic acid (AA) hydrogels on microleakage of class V composite restorations after an office bleaching protocol (B). Methods: 60 bovine incisors were sectioned 8mm from the amelo-dentinal junction to incisal and 2mm to radicular directions. Root canals were sealed with a composite and teeth were divided into 5 groups: C (control group) – the teeth were prepared (P) (4 x 3mm diam. diamond bur 3131 – KG Sorensen)  etched, rinsed (ER), adhesive system used (Ambar – FGM) and restored (R) with a microhybrid composite (Opallis – FGM); IR – B (2 sessions, 1 week interval - hydrogen peroxide 35% - Whitness HP Blue – FGM) + P + ER + R; SA -  B + P + SA 20%/15 min + ER + R;  AA – B + P + AA 10% /15min + ER + R; and MR – B + water storage (37°C/14d) + P + ER + R. Specimens were submitted to an aging process (thermocycling – 5/55°C/min, 5×104 cycles), varnish sealed, immersed in basic fuchsine (3h), washed and sectioned with a diamond disc. Microleakage was measured with the aid of ImageTool® software. ANOVA and a Tukey post hoc test were applied. Results. Microleakage (mm) and standard deviations per group were: C – 0.29 (0.06)A; IR – 1.86 (0.15)C; SA – 1.08 (0.09)B; AA – 1.07 (0.10)B; MR – 1.02 (0.12)B.  Conclusions. Bleached teeth submitted to superficial treatment with 20% SA and 10% AA applied for 15 minutes prior to restoration presented reduced microleakage when compared to bleached teeth immediately restored. The use of these antioxidants led to a microleakage comparable to that observed after a waiting period of 14 days prior to restoration.

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Published

2014-02-26

Issue

Vol. 20 No. 1 (2014)

Section

Original Research

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