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http://dx.doi.org/10.5392/JKCA.2010.10.11.235

Effect of 35% Hydrogen Peroxide with Dicalcium Phosphate Dihydrate on the Tooth Whitening and Microhardness  

Jeoung, Mi-Ae (강원대학교 치위생학과)
Oh, Hye-Seung (삼육보건대학 치위생과)
Shim, Youn-Soo (신흥대학 치위생과)
Publication Information
The Journal of the Korea Contents Association / v.10, no.11, 2010 , pp. 235-242 More about this Journal
Abstract
The purpose of this study was to evaluate tooth whitening and microhardness after treatments with tooth bleaching agents containing dicalcium phosphate dihydrate (DCPD) and 35% hydrogen peroxide (HP) which were used in-office bleaching. Thirty enamel specimens were obtained from human premolars and randomly divided into 3 groups(n=10). Tooth bleaching agents were prepared with DCPD (0 g for controls, 0.1 g and 1 g for experimental groups) and HP solution (35% HP). All groups were applied to enamel surfaces for 60 min for 1 day. The pH of each tooth bleaching agent was measured. Tooth color, microhardness of enamel surfaces were also measured. The tooth bleaching agents containing DCPD showed a significant increase in pH compared to the ones without DCPD(p<0.05). Paired t-tests showed significant difference in color values of enamel before and after bleaching in all the groups(p<0.05). As a result, changes in color, containing DCPD group does not contain a statistically significant difference between groups was observed.(p>0.05). In all groups, tooth hardness after bleaching showed a significant decrease in microhardness (p<0.05). However, the DCPD concentration increased in the bleaching, microhardness values slightly decreased. Based on the above results, tooth bleaching agents containing DCPD and 35%HP were equally effective. Due to increases in pH and effective reduction of tooth surface decalcification, the surface characteristics are exposed to a reduced degree of negative effects, resulting in fewer constituent enamel alterations. Thus, commercial availability of the constituents of tooth whitening materials can be achieved.
Keywords
35% Hydrogen Peroxide; DCPD; Tooth Color; Microhardness;
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