Study on the mechanism of discoloration and the efficacy of bleaching in non-infected traumatically discolored teeth.

Yi-Ning WANG; Feng-Ying CHEN; Tao JIANG

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Study on the mechanism of discoloration and the efficacy of bleaching in non-infected traumatically discolored teeth.

Author: Yi-Ning WANG ¹ ; Feng-Ying CHEN ; Tao JIANG
Author Information

1. Department of Prosthodontics, School of Stomatology, Wuhan University, Wuhan 430079, China. wangyn@public.wh.hb.cn
Publication Type:Journal Article
MeSH: Adolescent; Child; Humans; In Vitro Techniques; Random Allocation; Tooth Bleaching; methods; Tooth Discoloration; etiology; therapy
From: Chinese Journal of Stomatology 2004;39(6):492-495
CountryChina
Language:Chinese
Abstract:
OBJECTIVETo investigate the mechanism of discoloration and the efficacy of bleaching in non-infected traumatically discolored teeth.
METHODSIn vitro model of discolored teeth: sample of fresh erythrocytes was placed in the pulp cavity of 20 extracted teeth and centrifuged for 3 consecutive days. These discolored teeth were divided equally and randomly into two groups: group A (control group); group B (bleaching group), bleached with 10% carbamide peroxide gel for 4 weeks. And then all teeth were prepared for histological examination and subjected to a series of histochemical tests to analyze some of the biochemical changes following haemorrhage into the pulp chamber and post-bleaching.
RESULTSHaemoglobin and haematin were detected in the dentinal tubules of discolored teeth from group A and no evidence of ferric or haemosiderin. Specimens from group B demonstrated a negative response to histochemical tests.
CONCLUSIONSIn the absence of bacterial invasive, haemoglobin and haematin could cause discoloration of non-infected traumatized teeth. Peroxide bleaching agent can effectively remove haemoglobin and haematin.