Fig. 15.

Demineralized enamel contrast of varying depths. MC simulations showed that illumination using 405 nm with $10\times$ as well as $5\times$ increased scattering from sound to demineralized enamel provided higher contrast than 532 nm for shallow lesions. As demineralized enamel depth increased, the 405-nm curve flattened out more rapidly than the 532-nm curve. Additionally, a crossing in contrast was seen between 532 and 405 nm ($5\times$ increased scattering) at approximately 70 μm.