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An in vitro comparison of the bleaching efficacy of 35% carbamide peroxide with established intracoronal bleaching agents
Author(s) -
Lim M. Y.,
Lum S. O. Y.,
Poh R. S. C.,
Lee G. P.,
Lim K.C.
Publication year - 2004
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/j.1365-2591.2004.00829.x
Subject(s) - sodium perborate , carbamide peroxide , hydrogen peroxide , chemistry , dentistry , distilled water , peroxide , root canal , nuclear chemistry , medicine , chromatography , biochemistry , organic chemistry
Aim To evaluate the bleaching efficacy of 35% carbamide peroxide, 35% hydrogen peroxide and sodium perborate for intracoronal bleaching of root filled discoloured teeth. Methodology Extracted premolars were artificially stained using whole blood then root canal treatment was performed. After obturation, a 2 mm intermediate base was placed 1 mm below the buccal amelo‐cemental junction. Intracoronal bleaching was performed in 11 teeth per group, using either 35% carbamide peroxide gel (group CP), 35% hydrogen peroxide gel (group HP) or sodium perborate mixed with distilled water (group SP). The bleaching agents were replaced after 7 days. The shade of the teeth was evaluated at day 0, 7 and 14. The results were analysed using Kruskal–Wallis one‐way analysis of variance and Mann–Whitney U ‐test. Results At the end of 7 days, both groups CP and HP lightened by 8 ± 3 Vita tab positions, respectively, whereas group SP lightened by 5 ± 3 tab positions ( P < 0.05). At the end of the second bleaching period at day 14, group CP and HP lightened by a further 2 ± 2 and 2 ± 3 tab positions, respectively, whereas group SP lightened by a further 3 ± 4 tab positions. There were no statistical differences between groups at day 14. Conclusions Thirty‐five per cent carbamide peroxide and 35% hydrogen peroxide were equally effective for intracoronal bleaching, and significantly better than sodium perborate after 7 days. After 14 days, there were no significant differences between the groups. Thirty‐five per cent carbamide peroxide can be recommended as an equally effective alternative to hydrogen peroxide for intracoronal bleaching.