Permeability of different groups of maxillary teeth after 38% hydrogen peroxide internal bleaching

Brazilian Dental Journal

Lívia Maria Rodrigues²  Luis Pascoal Vansan²  Jesus Djalma Pécora¹  Melissa Andréia Marchesan² 

[1] ,University of Ribeirão Preto Dental School Department of EndodonticsRibeirão Preto SP ,Brazil

关键词: dentin permeability;    hydrogen peroxide;    bleaching;   

DOI  :  10.1590/S0103-64402009000400007

来源: SciELO

【 摘 要 】

This study evaluated the influence of internal tooth bleaching with 38% hydrogen peroxide (H2O2) on the permeability of the coronal dentin in maxillary anterior teeth and premolars. Seventy teeth (14 per group) were used: central incisors (CI), lateral incisor (LI), canines (C), first premolars (1PM) and second premolars (2PM). Pulp chamber access and transversal sectioning at 2 mm from the cementoenamel junction were performed and the specimens were divided into 2 groups (n= 7): a) no treatment and b) bleaching with 38% H2O2. The bleaching agent was applied to the buccal surface and to the pulp chamber for 10 min. This procedure was repeated 3 times. The specimens were processed histochemically with copper sulfate and rubeanic acid, sectioned longitudinally, and digitalized in a scanner. The area of stained dentin was measured using Image Tool software. Data were analyzed statistically by ANOVA and Tukey's HSD test (?=0.05). There was statistically significant difference (p<0.001) among the untreated groups, CI (0.23 ± 0.26) having the lowest permeability and LI (10.14 ± 1.89) the highest permeability. Among the bleached groups, dentin permeability was increased in all groups of teeth except for 2PM. It may be concluded that bleaching with 38% H2O2 affected dentin permeability near the pulp chamber in maxillary anterior teeth and in first and second premolars.

【 授权许可】

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