Types of porcelain teeth and selection: Here are two issues, one is to determine whether it is suitable for porcelain teeth, two is how to choose porcelain teeth according to the advantages and disadvantages of various types of porcelain teeth. A, suitable for porcelain dental restoration of the teeth are the following: 1, missing teeth, generally require a small number of missing and healthy adjacent teeth, no inflammation, can be considered for porcelain dental restoration. 2, the color or shape of the teeth is not good, such as heavy tetracycline teeth; dental morphology abnormal and not suitable for orthodontic treatment patients. 3, tooth decay or tooth defect is large, tooth discoloration is serious, can restore the beauty and oral function by porcelain teeth. 4, the tooth broken due to trauma or residual tooth root, such as the root has sufficient length, periodontal situation is good, after root canal treatment, can be porcelain dental restoration. 5, gum discoloration, redness and bleeding after porcelain teeth. At present, many cases appear this symptom. Second, porcelain crowns worn on the abutment teeth, always called porcelain teeth. At present, there are many types of porcelain crowns for oral restoration, with the development of dental materials and restorative techniques, certain materials are gradually eliminated, there are also constantly new materials porcelain crowns. The basic structure of porcelain crowns consists of two parts: the inner crown and the enamel porcelain layer, and the inner crown texture is divided into metal crowns and all-porcelain crowns. Now will be introduced to the common porcelain crowns in the Department of Stomatology, hope that the choice of porcelain crowns for reference. 1, metal crown porcelain crown: more than ten years ago when studying abroad to carry out the restoration of metal crown porcelain crown, to five years ago, the clinical common use of nickel-chromium alloy porcelain teeth, titanium porcelain teeth (containing only 4-6% of titanium), cobalt-chromium crown porcelain teeth. These porcelain crowns are essentially the same, due to gum discoloration and other problems, is not a mainstream product, the clinic has rarely done. 2, pure titanium crown porcelain teeth: “titanium” metal has excellent biosafety, light quality, stable performance, pure titanium metal is the only one does not react with the body of the metal, is the ideal choice of oral materials. Due to the hard texture of titanium metal, not easy to deformation, and the appearance of porcelain combined with a certain degree of difficulty, the results of clinical manifestation is easy to collapse porcelain. 3, all-porcelain teeth: In recent years, due to the development of material science and technology, all-porcelain teeth are increasingly used in clinical practice, has accounted for 85% of my personal porcelain dental repair cases. The fundamental difference between all-porcelain teeth and metal porcelain teeth is the inner crown made of porcelain, first with porcelain material firing inner crown, as a support skeleton, and then on the outer layer of porcelain powder firing. Because of the good light transmission and natural appearance, the current cost of all-porcelain is relatively high, about 2-3 times more than the metal crown porcelain teeth. Currently, the clinical use of porcelain teeth, zirconium dioxide all-porcelain teeth two. 4, cast porcelain teeth: two generations, a generation of white garnet as the inner crown, also called casting glass ceramic; second generation of lithium-based ceramic as the inner crown. The production process of cast porcelain teeth is to take a good dental mold, the whole casting. Cast porcelain crowns are particularly realistic in color and are more suitable for the cosmetic restoration of anterior teeth. Another advantage is that the hardness is close to that of natural teeth and does not wear the opposing teeth. However, due to its permeability, the color change may come through to affect the aesthetics, not suitable for aesthetic restoration of severely discolored abutment teeth. 5, zirconium dioxide all-porcelain teeth: good color, strength, non-toxic and harmless to the body, but for the wear and tear of the jaw teeth is heavy. The technology is mature, is currently the most used porcelain restorations often. Porcelain teeth do have the effect of restoring oral function and beauty, but the tooth function and gum tissue are bound to be affected after having porcelain teeth. Therefore, in my completed dental aesthetic restoration cases, all-ceramic teeth only account for one-third of the proportion, I like to carry out minimally invasive resin veneer technology and less invasive porcelain veneer technology. Key reminder: regardless of the type of porcelain teeth, attention must be paid to the wear and tear on the teeth, as well as to the long-term irritation of the gums! Therefore, porcelain veneers are suitable for missing, chipped and misaligned teeth that cannot be repaired by other methods.