Porcelain teeth is a kind of teeth whitening technology, what kinds of porcelain teeth, what are the characteristics of each kind? First, non-precious metal porcelain teeth 1, nickel-chromium alloy porcelain teeth: the metal for the porcelain base, biocompatibility is poor, a portion of the people will be allergic to the phenomenon of nickel, beryllium elements of the slow release of the gums will cause discoloration and oral toxicity, affecting human health. So I don’t really recommend patients to do this kind of porcelain teeth. 2, cobalt chromium metal porcelain teeth: physical properties can be, due to the absence of nickel, biocompatibility greatly improved, resulting in the probability of gum discoloration is also reduced, the requirements are not very high for patients to repair the effect can be. 3, titanium and titanium alloy porcelain teeth: titanium has good biocompatibility, non-toxic to the human body, at the same time have good corrosion resistance, is currently the development of better metal materials, but due to the difficulty of the production process, the further development of the clinical application needs further research. Second, semi-precious metal porcelain teeth 1, silver and palladium alloy porcelain teeth: silver and palladium alloy for porcelain base, due to the completion of the porcelain teeth base is white, so the market is also known as white gold porcelain. But now due to the stability of silver in the oral cavity to be further studied, so the recommended silver palladium alloy porcelain in the reduction. 2, gold and palladium alloy porcelain teeth: palladium is a biocompatible precious metal, gold and palladium together, the precious metal content has reached about 80%, has a fairly high biocompatibility. Porcelain teeth neck edge of the gums rarely occur in the black through the black, black line of the gums, generally does not cause discoloration of the gums. And good physical properties, is the best substitute for precious metals. Its affordable, is the type of developing countries recommend. Third, the precious metal porcelain teeth Containing gold about 86%, so also known as gold porcelain teeth, excellent biocompatibility, stable metal properties, corrosion resistance, metal ductility is good, rarely occur gum discoloration. In addition, the porcelain powder can reflect its own color on the surface of gold, so that the porcelain teeth are more beautiful, can fully meet the requirements of cosmetic restoration. So gold porcelain has both the beauty of all-ceramic, but also the strength of metal porcelain teeth, is currently the most respected metal porcelain. At present, most of the foreign production of this type of porcelain teeth, suitable for front and back teeth. The disadvantage is that the price is more expensive. Fourth, all-ceramic teeth all-ceramic material has beautiful, close to the teeth with the color, biocompatibility and other advantages, so porcelain teeth rarely occur gum discoloration, but its brittle. At present, most of them are limited to the front teeth restoration. Recently, the successful development and application of zirconium dioxide all-ceramic, due to zirconium dioxide all-ceramic teeth are made through computer-aided design, laser scanning, and then computer program-controlled milling, physical properties greatly improved, increased toughness and hardness, there are a number of properties have exceeded the metal, is the most ideal all-ceramic teeth and porcelain teeth.