LASER PHYSICS LETTERS 7(10), 2010
Research focuses on the interaction of light and teeth tissues, light diffusion and optical properties of dentine. From the view of characteristic spectrum of hydroxyapatite, the main inorganic minerals of teeth, at 443nm and 526nm excited by 405nm, the relationship between fluorescence characteristic spectrum ratio of enamel and dentine and demineralization level is investigated based on optical modeling and experimental measurement. The quantitative fluorescence spectrum evaluation parameter of teeth mineral content is built and the corresponding minimum excited power density is measured to be 141.5mW/cm2. The work provides theoretical foundation and experimental evidence for early quantitative diagnosis of dental caries.