On the contrary, the major advantage of porcelain is aesthetics. Because there are quite a number of shades of porcelain, it is usually pretty easy to match the shades of your adjacent teeth. Advances in porcelain techniques, which make it possible to fabricate anterior crowns without the metal underneath, have created more aesthetic restorations. New techniques have also made partial porcelain restorations possible. Occasionally, bonding porcelain restorations to the tooth structure can be more complicated than gold, but a good, strong bond is created.
Stainless steel crowns for adults are the least desirable type of crown.
They are great for primary teeth, but not so for permanent teeth. This may result in loss of healthy tooth structure. For the same reason, the marginal integrity is not always very good. Not only could this allow bacteria to leak underneath the crown possibly causing decay, but this can serve as a constant irritant to the gum tissue. Because stainless steel crowns are silver, most patients do not consider them to be very cosmetic.