Ex vivo evaluation of the effectiveness of bleaching agents on the shade alteration of blood-stained teeth

International Endodontic Journal
Karen Cristina Kazue YuiS E P Gonçalves

Abstract

To evaluate ex vivo effectiveness of the three formulations of bleaching materials for intracoronal bleaching of root filled teeth using the walking bleach technique. Extracted premolar teeth were stained artificially with human blood. After biomechanical preparation, the root canals were filled and a 3-mm thick intermediate base of zinc phosphate cement was placed at the level of the cementoenamel junction. The teeth were divided into four groups (n = 12): C (control, without bleaching material), A1 (sodium perborate + distilled water), A2 (sodium perborate + 10% carbamide peroxide) and A3 (sodium perborate + 35% carbamide peroxide). The bleaching materials were changed at 7 and 14 days. Evaluation of shade was undertaken with aid of the VITA Easyshadetrade mark (DeltaE*ab) and was performed after tooth staining and at 7, 14 and 21 days after bleaching, based on the CIELAB system. Data were analysed by anova for repeated measurements, Tukey and Dunnett tests (alpha = 0.05). The Tukey test revealed that group A1 (10.58 +/- 4.83 DeltaE*ab) was statistically different from the others (A2, 19.57 +/- 4.72 DeltaE*ab and A3, 17.58 +/- 3.33 DeltaE*ab), which were not different from each other. At 7 days: A1 was significantly different...Continue Reading

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Citations

Sep 26, 2012·Photomedicine and Laser Surgery·Eri TanoJunji Tagami
Apr 9, 2011·Dental Clinics of North America·So Ran Kwon
Jul 14, 2012·International Endodontic Journal·M CardosoC R G Torres
Aug 10, 2015·Clinical Oral Investigations·Lucia K ZauggGabriel Krastl
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