Effect of non-vital tooth bleaching on microleakage of coronal access restorations

E. C.N. Teixeira, A. T. Hara, C. P. Turssi, M. C. Serra

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

This study evaluated the effect of non-vital tooth bleaching on microleakage of composite resin/bovine tooth interface at different post-bleaching times. A total of 320 teeth were cleaned. A pulp chamber access cavity was made at the lingual surface of each tooth. The teeth were randomly divided into four groups: SPH - sodium perborate + 30% hydrogen peroxide; SPW - sodium perborate + distilled water; CP-37% carbamide peroxide; and CON-distilled water (control). The bleaching agents were replaced every 7 days, over 4 weeks. Following bleaching procedures, the groups were divided into four subgroups (n = 20), according to the post-bleaching times: 0 (baseline), 7, 14 and 21 days. After that, the cavities were restored with an adhesive system (Single Bond; 3M Co., St Paul, MN, USA) and a composite resin (Z100/3M). The specimens were thermocycled, stained with 2% methylene blue solution (pH 7), and sectioned longitudinally. The teeth were evaluated blind and independently by three previously calibrated examiners, to provide representative scores. The data were submitted to Kruskal-Wallis and multiple comparison tests (α = 0.05). At baseline and 7 days, the SPH group showed a higher degree of dye penetration than the CON (P = 0.04). At 14 and 21 days, there were no differences among groups. The association of sodium perborate with 30% hydrogen peroxide or with water may affect the sealing ability of composite resin restorations performed up to 7 days after bleaching procedures.

Original languageEnglish (US)
Pages (from-to)1123-1127
Number of pages5
JournalJournal of Oral Rehabilitation
Volume30
Issue number11
DOIs
StatePublished - Nov 2003

Keywords

  • Bleaching agents
  • Microleakage
  • Non-vital bleaching

ASJC Scopus subject areas

  • Dentistry(all)

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