Objective: To investigate clinical effect of ball-cap retained implant-supported overdenture (BCRISO) and Decalcifed Dental Matrices(DDM)in the atrophied edentulous mandible (AEM).

• 目的:了解球帽附着体种植覆盖义齿及脱钙人牙基质材料(DDM)在牙槽骨萎缩的下颌无牙颌的临床应用效果。