This ‘invisibility’ requires that the optical properties of colour, gloss and translucency of tooth substance be reproduced in the restorative materials. The factors concerned on this, and the conditions under which it could be obtained, involve understanding the character of color. Although several sorts of materials are available, like composite veneers, acrylic veneers, porcelain veneers, and ceramic veneers, none of them fulfill the mix of requests listed above.

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