The present invention relates to an improved dental implant body structure, wherein the implant body is in an approximately cylindrical shape having its top end provided with an abutment and its lower end provided with an implanting portion. The present invention is characterized in that the implanting portion of the implant body and the outer surface of the neck portion connected with the abutment are configured with an annular portion with a rough surface. When the implanting portion is buried into the alveolar bone at the predetermined implanting location of a patient, the annular portion may be engaged with the cortical bone structure of the alveolar bone, so as to enhance the combination stability between the implant body and the cortical bone tissues of the alveolar bone surface, and further enhance the stability of the implant body in the primary implantation stage.本發明係有關一種人工植牙體改良結構,其中該植牙體係概呈圓柱狀,其頂端具有一支檯座,下端具有一植入部;其主要特徵,係在於植牙體的植入部與支檯座連接之頸部位置的外側表面設置有一具有粗糙表面的環狀部;當植入部埋入前述患者預定植牙位置的槽骨中時,環狀部係可與該槽骨之表層皮質骨結構相互咬合,藉以提高植入體與槽骨表層的皮質骨組織結合的穩固性,進而提高植牙體植入初期的穩定度。10‧‧‧人工植牙體11‧‧‧支檯座111‧‧‧溝槽12‧‧‧植入部13‧‧‧螺牙部14‧‧‧頸部15‧‧‧環狀部20‧‧‧贗復齒21‧‧‧套合件30‧‧‧槽骨31‧‧‧皮質骨40‧‧‧凹狀剖溝
