镶牙知识（Dental knowledge）.doc

镶牙知识（Dental knowledge） First, the following 5 cases should not be made porcelain teeth: The number of a and tooth loss was more than 4, and there were more than 2 consecutive missing teeth. B and loose teeth should not be used as porcelain teeth. C and periodontal disease are serious, and alveolar bone is obviously absorbed. D, there is pathological change at the root of the tooth. E, the crown of the hard tissue destruction, deep under the gums. Wearing ceramic braces okay? Two, from the point of view of gingival irritation wearing ceramic braces is good 1. The inner crown, inner layer and metal band of common porcelain teeth were plated with twenty-four K pure gold It is golden brown. It can relieve the irritation of the ordinary alloy to the tissue and prevent the gum from appearing to a certain extent Black lines improve biocompatibility. At the edge of the porcelain crown about 1 mm, made of special porcelain powder material, The neck is not the end of porcelain color, to avoid metal contact, stimulate the gums. 2, from the teeth color wearing ceramic braces is good The color of ordinary porcelain teeth is close to that of genuine teeth. The color of the teeth is stable, the range of application is wide, and the utility model is economical and practical. But its disadvantage is that the chemical properties of Ni Cr alloy are unstable, and it is easy to cause gingivitis and porcelain fused to gold A marginal discoloration of the black gingival line, and some people in the crowd have varying degrees of allergy to nickel Reaction. For 3, ceramic braces in tooth discoloration, broken teeth, crown defect repair cases The complex, dental patients should be cured before dental braces. The fabrication of metal alloy with ceramic braces The inner sleeve, and then the surface is covered with ceramic material, sintered in vacuum melting of a ceramic furnace. 4, in addition, experts said that the ceramic braces medicine known as the porcelain fused to metal crown. Insert C