The present invention relates to a screw for implants and, more particularly, to a screw for implants capable of preventing unfastening of the screw, which keeps fastening a fixture and an abutment, thereby maintaining a stable fastening state. A screw for implants according to the present invention comprises a screw portion and a head portion. The head portion has a plurality of troughs formed on the outer peripheral surface, which is inserted into an abutment and contacts the abutment, along the circumferential direction, thereby coupling the abutment arranged on the upper end of a fixture. And the head portion is formed to have a diameter decreasing from the upper portion thereof towards the lower portion thereof. According to the present invention, the troughs are formed on the outer peripheral surface along the circumferential direction such that, during screw coupling, the lower surface of the screw, which is coupled to an abutment, is deformed towards the troughs. The deformed lower surface then applies a force to the abutment such that screw coupling between the screw and the fixture does not become unfastened. And, since the diameter decreases from the upper portion towards the lower portion, and at least a plurality of troughs are formed, a side surface contact at each trough portion causes deformation, thereby increasing the strength of screw coupling between the screw and the fixture. In addition, according to the present invention, the outer side of the lower surface of the head portion is formed to protrude more than the inner side thereof such that deformation of the head portion is larger at the portion of contact with the abutment, thereby preventing unfastening of the screw coupling of the screw and the fixture.COPYRIGHT KIPO 2015본 발명은 임플란트용 스크류에 관한 것으로서, 보다 상세하게는 픽스쳐와 어버트먼트를 체결하고 있는 스크류의 풀림을 방지하여 안정된 체결상태를 유지할 수 있는 임플란트용 스크류에 관한 것이다.본 발명에 따른 임플란트용 스크류는 나사부와 머리부를 포함한다. 상기 머리부는 픽스쳐의 상단부에 배치되는 어버트먼트를 결합시키기 위하여 어버트먼트 내측으로 삽입되고 어버트먼트와 접촉하는 외주면에 원주방향을 따
