하악 치밀골 관통방법으로 이식시의 응력분산효과에 관한 유한요소분석적 연구

Dental implantation is a method restoring missing teeth, especially in the case of severely resorbed edentulous patient. But the direct contact between bone and implant surface, induces stress concentraction to bone and eventually becomes a cause of failure in some cases. The purpose of this study was to compare the stress distribution patterns between following two cylindrical implant models. One group has implant apex located in the inferior cortical bone and the other in the cancellous bone. Anterior edentulous mandible was modeled with two dimensional 953,878 nodes, 995,918 elements and compared the deflection and stress distribution under the 70 N, 4 load cases for 26 models having variant mandibular height and length. The results were as follows : 1. The stress concentration was more affected by the height of the mandible than implant length. 2. Bicortication mitigates the stress of upper cortical and cancellous bone area at the same height of the mandible. 3. Perforation of the inferior mandibular cortex induced significant stress concentration. 4. Stud type prostheses induced less stress concentration to the cortical and cancellous bone than bar type prostheses. 5. Stress of implant apex for stud type was larger than that of bar type.