A method of manufacturing a guide stent for a dental implant of the present invention guides an implant placement according to obtained 3-dimensional image information of a periodontal tissue and improves an accuracy of an implant operation. The method of manufacturing a guide stent for a dental implant of the present invention includes: obtaining a 3-dimensional outer shape image corresponding to a 3-dimensional image of a periodontal tissue in a mouth of a subject through the 3-dimensional image of a periodontal tissue in a mouth of a subject and an oral scan from a computerized tomography (CT) scan setting a common part of the 3-dimensional image and the 3-dimensional outer shape image as a comparison region so that a 3-dimensional operation guide image is obtained by overlapping the 3-dimensional image and the 3-dimensional outer shape image and image matching the 3-dimensional image and the 3-dimensional outer shape image through a difference map, which outputs a degree of matching between images and compensates each image so that an uppermost part and an outermost part of the comparison region from the overlapped 3-dimensional image and 3-dimensional outer shape image match with each other and manufacturing a stent body having a through hole corresponding to a predetermined implant placement position according to the obtained 3-dimensional operation guide image, wherein the step of setting the comparison region includes classifying and outputting the degree of matching between the images by color and designating and receiving a part in the comparison region having the degree of matching less than the predetermined degree of matching as an error region, and the step of compensating the 3-dimensional outer shape image is performed within the error region range.COPYRIGHT KIPO 2014획득된 치주조직의 3차원 이미지 정보에 따라 임플란트 식립을 안내하되 시술의 정밀성이 향상되도록, 본 발명은 CT 촬영을 통한 피시술자의 구강 내 치주조직의 3차원 이미지 및 오랄 스캔을 통한 상기 3차원 이미지에 대응되는 3차원 외부형상 이미지를 획득하는 제1단계 상기 3차원 이미지 및 상기 3차원 외부형상 이미지를 중첩하여 각
