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KMID : 1023420120120040320
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Journal of Dental Hygiene Science
2012 Volume.12 No. 4 p.320 ~ p.328
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Effects of 3.5% Hydrogen Peroxide Containing Dicalcium Phosphate Dihydrate on the Tooth Enamel Surface
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Shim Youn-Soo
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Abstract
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The purpose of this study was to evaluate the tooth whitening and properties of an enamel surface after treatments with tooth bleaching agents that contained dicalcium phosphate dihydrate (DCPD) and hydrogen peroxide (HP). Thirty specimens were obtained from fifteen premolar and were randomly divided into three groups (n=10): 1, 3.5% HP + 0 g DCPD; 2, 3.5% HP + 0.1 g DCPD; 3. 3.5% HP + 1 g DCPD. All groups were bleached 8 hours per day for 14 days. With increasing DCPD concentration, the pH values in the agents increased, making it less acidic. However, there was no statistically significant difference (p＞.05). As the concentration of DCPD was increased, the concentration of Ca and P was also increased. In all groups, after the tooth whitening, the tooth color was found to have a value of L* (p＜.05). All groups showed significantly decreased enamel microhardness compared to their baseline (p＜.05). The percentage microhardness loss (PML) of the group A1 and A2 were significantly lower than that of group A3. The obvious variation of morphology was observed on enamel surfaces in group A1. Following an analysis of the constituents of enamel surface after bleaching, as DCPD content was increased, the amount of Ca and P was increased. In this study, the experimental results suggest that DCPD/HP agent less demineralization changes such as the erosion morphology and hardness loss without compromising whitening efficiency.
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KEYWORD
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Dicalcium phosphate dihydrate, Microhardness, pH, Tooth bleaching
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