1.Whole mouth tooth loss, especially serious atrophy of the mandibular alveolar bone, traditional denture restoration is not fixed; 2.Loss of teeth at the free end; 3.Partial or individual missing teeth, the remaining teeth are not suitable as abutment teeth or to avoid natural teeth damage injury; 4.Poor retention of movable denture, low function, the mucosa can not tolerate; 5.Tumor or trauma caused by jaw bone defects, the need for functional reconstruction of the jaw bone; 6.The traditional denture restoration can not meet the aesthetic, comfort and functional.