The purpose of the present invention is to provide an abutment assembly capable of innovatively easily performing an implant procedure process by enabling a healing cap, a scan body or an upper abutment and a prosthetic appliance to be compatibly (selectively) coupled to the base abutment after fastening a base abutment to a fixture. The abutment assembly according to the present invention includes: the fixture which is buried in and fixed to alveolar bone and includes an inner circumferential surface screw part； the base abutment which includes a lower screw part fastened to the inner circumferential surface screw part of the fixture and has an inner circumferential surface screw part formed in a central hole thereof； the upper abutment which is inserted into and coupled to a polygonal groove formed in an upper portion of the central hole of the base abutment； the prosthetic appliance in which an insertion hole is formed such that an upper post portion of the upper abutment is inserted into and coupled to the insertion hole from the lower side； and a first screw which is inserted into and coupled to the insertion hole of the prosthetic appliance from the upper side, and is fastened to the inner circumferential surface screw part of the base abutment by passing through the upper abutment, wherein the healing cap or the scan body can be fastened to the base abutment.본 발명의 어버트먼트 조립체는, 치조골에 매립되어 고정되고 내주면 나사부를 구비하는 픽스쳐； 상기 픽스쳐의 내주면 나사부에 체결되는 하단 나사부를 구비하고 중심홀의 하부에 내주면 나사부가 형성된 베이스 어버트먼트； 상기 베이스 어버트먼트의 중심홀 상부에 형성된 다각홈에 삽입되어 결합되는 상부 어버트먼트； 상기 상부 어버트먼트의 상부 포스트부가 아래에서 삽입되어 결합되는 인입홀이 형성된 보철물； 및 상기 보철물의 인입홀에 위에서 삽입되어 결합되고 상기 상부 어버트먼트를 통과하여 상기 베이스 어버트먼트의 내주면 나사부에 체결되는 제1스크류를 포함하고, 상기 베이스 어버트먼트에는 힐링 캡 또는 스캔 바디가 체결될 수 있다.
