Porcelain teeth contain metal and non-metallic porcelain teeth, metal porcelain teeth have been less used, non-metallic porcelain teeth are usually said to be all-ceramic teeth, the degree of solidity are available. 1. Metal porcelain teeth: the inner crown is metal, outside the decorative porcelain, more beautiful, close to the real teeth, and strong and durable, especially when doing the bridge or long bridge, has the advantage, but the metal crown in the human body to check the magnetic resonance will be affected by the metal allergy should not be made. At present, due to the emergence of dental implants, rarely made fixed bridge repair. 2. Non-metallic porcelain teeth: the inner crown is zirconium dioxide, and then outside with decorative porcelain, color close to real teeth, no stimulation of the human body, does not affect the MRI, is currently the most commonly used crowns, in the production of bridges, the strength of the bridge is relatively less than the metal is high, easy to fracture of the bridge, if it is the strength of the single crown is available. Although the strength of metal porcelain teeth is high, but there are some shortcomings, now the clinical application has been rare, non-metallic porcelain teeth, is currently the most commonly done crowns, if you need to do crowns, it is recommended to develop a comprehensive program under the guidance of the doctor.