Changes with age in the auto-fluoresence intensity of human dentin, in the buccolingual and longitudinal directions.
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Changes with age in the auto-fluorescence intensity of six regions in human dentin were studied in the buccolingual and longitudinal directions using a time-resolved fluorescence microphotometer. Static measurement showed that fluorescence intensity increased with age in all six regions. However, the wavelength at maximum fluorescence or at full width of half maximum in the fluorescence emission spectrum, did not change ; the former and latter values were about 440 nm and 100 nm, respectively, in all six regions of all the teeth studied. Dynamic measurement suggested that auto-fluorescence at a wavelength of 440 nm had at least three components with different fluorescence decay times ; fast, intermediate and slow.<BR>The fluorescence intensities of these components increased with age in all six regions ; the intensity of the fast component increased in proportion to age after 18 years, while the rate of the increase in the fluorescence intensities of the other two components decreased with age. Changes with age in the ratio of the intensity of the three components to the static fluorescence intensities were distinguishable longitudinally; the ratio of the fast component increased with age in coronal dentin, while the ratio of the slow component decreased with age in dentin of the root apex. Cervical dentin showed a tendency intermediate between these two regions. These results indicate that patterns of changes with age differed in the longitudinal direction, which suggests that factors that affect age changes differ between coronal and root apex dentin.
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