A detachable prosthodontic device and related screw are disclosed.The detachable prosthodontic device includes an abutment, a suprastructure, and a screw.The abutment includes an abutment collar and a hollow chamber, and a screw hold is arranged on an abutment wall of the hollow chamber.The suprastructure is provided with a receiving region and an inner surface surrounding the receiving region.The screw includes a screw head and a screw rod.The screw head includes a contact member and a guiding member, and the guiding member is positioned between the contact member and the screw rod.When the screw is arranged in the screw hold, a portion of the screw head protrudes outward from an outer surface of the hollow chamber.When the suprastructure is sleeved onto the abutment, partial area of the outer surface of the hollow chamber contacts with partial area of the inner surface of the suprastructure, and the screw head supports an opposing side of the inner surface to apply a force onto the inner surface to thereby engage the suprastructure with the abutment.本新型提出一種可拆卸假牙裝置及相關的螺絲。可拆卸假牙裝置包含支座、上部構造、及螺絲。支座包含支座接合部及中空腔體,且中空腔體的支座壁上有螺絲孔。上部構造設置有容置區及圍繞容置區的內側面。螺絲包含螺絲頭與螺桿。螺絲頭包含接觸部與導引部,導引部位於接觸部與螺桿之間。當螺絲設置於螺絲孔中時,螺絲頭的局部會從中空腔體的外表面向外突出。100‧‧‧可拆卸假牙裝置102‧‧‧齒槽骨104‧‧‧牙科植體106‧‧‧牙齒110‧‧‧支座111‧‧‧支座接合部112‧‧‧中空腔體113‧‧‧開孔114‧‧‧外表面115‧‧‧支座壁120‧‧‧上部構造121‧‧‧容置區122‧‧‧內側面130‧‧‧螺絲132‧‧‧螺絲頭134‧‧‧螺桿140‧‧‧支座螺絲
