Active teeth can be removed by the patient, the amount of abutment teeth removed during preparation is small, and the damage to the dentition is small, but it is inconvenient to take and wear repeatedly, and in case of falling on the ground, the porcelain is easy to break, and the abutment has a foreign body feeling. Fixed teeth can not be removed by the patient, the preparation of the abutment teeth to remove the amount of more, but easy to use, but also no foreign body feeling. The choice of the two also depends on the patient’s situation and requirements, the doctor to determine which one to set.