According to the classification of denture is divided into fixed denture, movable denture and implant denture, retention rely on retention type and adhesive force, denture base and ring, own jawbone and implants. 1. Fixed denture. Fixed denture is fixed on your own teeth by the friction and retention of the teeth after preparation, and adhesive. 2. Removable Denture. Activity denture including artificial dental prosthesis base and ring, fixed mainly through the base and ring card holding in the oral mucosa and neighboring teeth for fixation. 3. Implant denture. The implant denture is cemented by the bone union formed by the implant and the jawbone, and the jawbone, the implant and the upper abutment together cement the crown. The method of denture retention varies according to the type of restoration.