In vivo spectrophotometric evaluation of pure enamel and enamel-dentine complex in relationship with different age groups

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.