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Effect of non‐vital tooth bleaching on microleakage of coronal access restorations
Author(s) -
Teixeira E. C. N.,
Hara A. T.,
Turssi C. P.,
Serra M. C.
Publication year - 2003
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.2003.01161.x
Subject(s) - sodium perborate , distilled water , dentistry , hydrogen peroxide , carbamide peroxide , sodium hypochlorite , chemistry , sodium ascorbate , methylene blue , nuclear chemistry , ascorbic acid , medicine , chromatography , food science , biochemistry , organic chemistry , photocatalysis , catalysis
summary 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.