Crown restoration methods, such as root and crown defects or inflammation need to be treated and the crown restored after treatment. Crown restoration methods, depending on the material, size and scope of the defect. Mainly divided into two cases: 1, such as teeth with vitality only crown defect, small defects directly fill with tooth-colored material, repair almost can not see there has been a defect; for a large range of available inlay restoration, with computer-aided design method, with defective tooth morphology and tooth color exactly the same material, stick in the defect area. Now promote minimally invasive treatment, tooth defects have vitality, need to clean up the defective area, computer to take the model, processing plant in accordance with the scan, the computer design tooth form, lathe processing, 1-2 hours can be completed, and convenient, beautiful, good results, long-lasting function. 2, there is a part of the tooth defect more, the root has inflammation, teeth do root canal treatment after the loss of vitality, need to use the crown restoration, with dental crown as a whole wrap. There are more materials for dental crowns, the most common metal crowns, now gradually tends to be eliminated, because the color is not good, now there are porcelain crowns, all-porcelain crowns, zirconium oxide, these types are based on personal needs and economic ability to choose.