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Effect of traditional and alternative intracoronal bleaching agents on microhardness of human dentine
Author(s) -
Chng H. K.,
Yap A. U. J.,
Wattanapayungkul P.,
Sim C. P. C.
Publication year - 2004
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 - 10.1111/j.1365-2842.2004.01298.x
Subject(s) - sodium perborate , hydrogen peroxide , distilled water , chemistry , indentation hardness , carbamide peroxide , nuclear chemistry , dentistry , enamel paint , sodium , peroxide , chromatography , biochemistry , organic chemistry , medicine , microstructure , crystallography
summary The purpose of this study was to compare the effect of traditional and alternative bleaching agents on microhardness of human dentine when used intracoronally. Thirty‐six premolars were divided into six groups and bleaching agents were sealed into the pulp chambers as follows: group 1 – distilled water (control), group 2–30% hydrogen peroxide solution, group 3 – sodium perborate mixed with distilled water, group 4 – sodium perborate mixed with 30% hydrogen peroxide solution, group 5–35% carbamide peroxide gel, group 6–35% hydrogen peroxide gel. Access cavities were sealed and the teeth were stored in distilled water at 37°C. After 7 days, each tooth was sectioned at the cemento‐enamel junction level and microhardness testing was carried out on dentine. The results showed that treatment with 35% hydrogen peroxide gel, 30% hydrogen peroxide solution and 35% carbamide peroxide gel reduced the microhardness of outer dentine to a small extent while treatment with sodium perborate mixed with water and sodium perborate mixed with 30% hydrogen peroxide solution did not significantly alter the microhardness of dentine.