Tianjin Tanggu District Dental Hospital, Department of Prosthodontics Wu Shichao: the first approach, the original broken end back, if there is still the second approach: if there is no leakage of nerve line, directly do a porcelain crown, if leakage of nerve line, do root canal treatment and then do porcelain crown restoration Tianjin Tanggu District Dental Hospital, Department of Prosthodontics Wu Shichao third approach: the tooth is broken too much, may need to be pulled out of the patient: description of the condition ( The onset of time, the main symptoms, the hospital, etc.): the patient male, 20 years old. March 15, 2011 morning out of the car, off the station when the car frame knocked half of the tooth, I do not know whether the repair can be complete. No other hospitals