Strictly speaking, porcelain crowns are only suitable for missing, defective and twisted anterior teeth. Because of the suspicion of porcelain collapse and the consideration of edge sealing, it is necessary to consider the application of porcelain crown in posterior teeth. Tetracycline tooth, enamel dysplasia, dental fluorosis. From the economic point of view, zirconia all-ceramic crown is the first choice. After all, zirconia porcelain crowns are much cheaper than gold porcelain. Generally, about 4000 yuan in first-tier cities is more reasonable. There are many other materials to consider, such as nickel-chromium alloy. Cobalt and chromium. Pure titanium (titanium alloy porcelain crown has been eliminated). Silver palladium porcelain crown. Alumina all-ceramic crown. Based on nickel-chromium porcelain crowns, for example, each nickel-chromium porcelain crown is 500, and other porcelain crowns will generally multiply in turn.