임플란트 보철 스크류 홀의 위치 분석 연구

Abstract

Dental implants are a very effective treatment that restores the function and aesthetics of missing teeth. However, implants have a biomechanically disadvantageous structure compared to natural teeth due to a lack of periodontal ligaments, a lack of protective reflection, and a lack of buffering ability against the occlusal loading. In order to compensate for the structural limitations of these implants, occlusal considerations are essential to minimize the stress applied to the implants. In this study, we tried to verify whether the basic biomechanical principle that stress should be applied along the long axis of the implant fixture is appropriately applied to actual implant clinical treatments. Accordingly, the accuracy of implant placement was indirectly confirmed through the location of the screw hole to see if the implant long axis was located at the center of the occlusion surface using the image of the STL file formed during the digital laboratory process. 275 patients and 438 teeth were included in this study. The number of samples by tooth type was 57 in the first premolar, 66 in the second premolar, 152 in the first molar, and 117 in the second molar, respectively. The occlusal surfaces of the implant’s crown were divided in nine equal grids based on the outermost boundary, and the position of the screw holes was analyzed. With the limitation of this study, following conclusions were obtained from the observations of the experimental group(group A) without the guide and the control group (group B) with the guide. In Group A, the accuracy of implant placement decreases from premolars to molars. In Group A, the accuracy of implant placement in the upper jaw was lower than that of the lower jaw, and the accuracy on the right side was lower than that on the left side. In Group A, the accuracy of implant placement was higher than in group B.