Conclusions L* values in enamel, as well as a* value of 3mm thick enamel–dentine complex and 2mm pure enamel were significantly higher in the young age group. Clinical significance L* and a* values of enamel over white and black backgrounds were statistically different within the 2 age groups considered. L* values over white background and a* values over black background of the enamel dentine complex seem to change with age. The opacity (CR) for enamel nor for enamel dentine complex does not change within the two age groups considered in this study. (Source: Journal of Dentistry)
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