Why would root-canal treated teeth need a cosmetic (white) post?
All-porcelain restorations allow direct light to penetrate. The amount of scattering versus transmission of light depends on the chemical composition of the porcelain1s glass matrix, the size and structure of the crystalline phase, and the processing technique. Light penetration adds a translucency to the restorations that is comparable to natural teeth even under compromised light conditions. The transillumination quality also improves the natural pale-pink appearance of the adjacent marginal gingiva. The remaining tooth structure should be observed more critically in light of the high translucency of all-porcelain crown systems. Dark and non-pleasing stumps can spoil the appearance of very translucent restorations. The drawback of any light-inhibiting core material is a shadow effect at the gumline. Even all-porcelain crowns can cause a dark gumline if their cores are too opaque and inhibit light transmission. Bleaching, opaquers, and cosmetic endodontic posts should therefore be con
