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Measurements of Fluorescence Heterogeneity in Human Teeth Using Polarization Microfluorometry

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Abstract:

Human teeth fluoresce as a result of illumination by UV-light (λmax = 450 nm). The spectral, anisotropic, and temporal heterogeneities of a tooth's fluorescence have been investigated with respect to tooth structure. A polarization microfluorometer and a time-resolved fluorometer were employed. The fluorescence intensity of the dentin increases with tooth age. On the basis of the fluorometric investigations, it appears that a complex of cross-linked collagen with hydroxyapatite is a possible fluorescing compound within the tooth tissue. Observed fluorescence anisotropy in the tooth tissue suggests heterogeneous structure of the fluorescing compound. Anisotropy distribution shows characteristic profiles which are independent of age and sex, and of type of tooth. Analysis of fluorescence decay curves suggests that such profiles are due to the characteristic arrangement of the fluorophore electric dipole, which in turn relates to tissue construction.

Keywords: Fluorescence anisotropy; Fluorescence lifetime; Microfluorometer; Tooth fluorescence; Tooth tissue

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702904087505

Affiliations: 1: Department of Mechanical Engineering, Faculty of Engineering, University of Tokushima, Jousanzima, Tokushima 770, Japan 2: Department of Mechanical Engineering, Faculty of Engineering, University of Tokushima, Jousanzima, Tokushima 770, Japan; present address: Department of Instrumentation Engineering, Faculty of Engineering, Kobe University, Rokkou, Kobe 657, Japan 3: Department of Orthodontics, School of Dentistry, University of Tokushima, Kuramoto, Tokushima 770, Japan 4: Department of Pharmacy, Dental Hospital, University of Tokushima, Kuramoto, Tokushima 770, Japan

Publication date: May 1, 1990

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