象牙質変色に対する漂白効果の色彩学的検討

概要

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Purpose: This study examined the color analysis of 3% hydrogen peroxide on organic and inorganic chromogen sources in bovine dentin. Materials and Methods: 21 bovine dentin samples with a thickness of 0.5mm were prepared. Samples were divided into 7 groups discolored by organic chromogen sources (Maillard reaction using a glucose; GL solution), inorganic chromogen sources (trace metal elements; Ni, Cu, Fe) and by mixture of both the Maillard reaction and trace metal elements. Spectrophotometric measurements were taken before the samples were subjected to 3% hydrogen peroxide and throughout the bleaching process at 10 seconds intervals (total 120 seconds). Color changes on dentin samples of 7 groups were analyzed for color difference ⊿E, L*, a* and b* values. Results: Samples discolored via the Maillard reaction responded best by increasing their ⊿E values while decreasing the b* values. In contrast, samples discolored by trace metal elements of Cu were not responsive, and samples discolored by Fe were darkened greatly. Ni indicated a slightly positive response. Conclusion: Hydrogen peroxide was effective in bleaching samples discolored by Glucose and Ni. However, the peroxide bleaching decreased the value of L*, and worsened the effect for samples discolored by Fe. This study suggests that the type of chromogen that discolors teeth has a great role in determining the efficacy in peroxide bleaching.
岩手医科大学歯学会の論文
2006-04-25