Compared with conventional denture, implant denture has the following advantages: 1. Good support, retention and stabilization function of implant denture. As the biting force is directly transmitted to the jawbone through the implant, it prevents the jawbone from atrophy and resorption, and it can withstand a larger biting force, so the chewing efficiency is significantly improved. 2, implant denture similar to the state of natural teeth, usually under the conditions of the vast majority of patients can obtain a beautiful restorative effect. 3.Because implant denture has good retention, no abutment or small abutment area, it has good comfort. 4, implant denture to avoid the fixed denture repair preparation of neighboring teeth to damage the surface layer and its possible adverse consequences and psychological burden on the patient. 5, some patients who can not use conventional restorations can get good results through implant restorations.