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KMID : 0362520090110020111
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Journal of The Korean Academy of Dental Hygiene
2009 Volume.11 No. 2 p.111 ~ p.120
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Comparison of Light Activated Bleaching Effect using High Concentration Hydrogen Peroxide and Carbamide Peroxide
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Koo Hyo-Jin
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Abstract
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This study aims to evaluate color change and morphological changes through light activated bleaching by applying plasma arc to HP and CP. Forty-eight extracted bovine incisors were selected and embedded in the resin blocks. All the specimens were highly polished and discolored with commercial COCK®. High concentration HP and CP with and without plasma arc were used for bleaching. Specimens were bleached for 1 hour per week during 3 weeks. Color and morphological change were determined with colorimeter (TC-8600A), microhardness tester (MXT-a7) and scanning electron microscope (S-4200). All the collected data were analyzed by repeated measures ANOVA at 0.05 percent significant level. The degree of color changes (ΔE*) in all groups increased as bleaching frequency increased. Microhardness decreased in all groups after bleaching process. The SEM evaluation showed enamel surface change in all groups after tooth bleaching. Office Bleaching using plasma arc as a bleaching agent caused the degree of color change to increase. Office bleaching using the high concentration HP and CP with plasma arc also detract the outer surface of enamel.
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