The purpose of the present invention is to provide a dental implant which makes the implant smoothly implanted even in a particular position, and arranges an artificial tooth to be close to an original tooth. Accordingly, provided is a dental implant comprising: a fixture having an index groove in which an internal circumferential surface is M-polygon； and an abutment inserted into the index groove and having an index bump in which an outer circumference surface is N-polygon, wherein M=(1/2)N {M and N are the positive integer}.본 발명은, 내주면은 M각형을 이루는 인덱스 홈을 구비하는 픽스쳐； 및 상기 인덱스 홈에 삽입되며, 외주면은 N각형을 이루는 인덱스 돌기를 구비하는 어버트먼트를 포함하고, M=(1/2)N{여기서, M과 N은 정(正)의 정수}인 치과용 임플란트를 제공한다.
