Journal of implantology and applied sciences ISSN:2765-7833(Print) 2765-7841(Online) 대한구강악안면임플란트학회지

This study was performed to investigate and effect of different bone density, the number and location of implant, the design of prosthesis, and method of using cortical bone in edentulous mandible. The implant prostheses with 13mm and 20mm implants were designed on the mandibular model. Stress distribution patterns and displacement value were analyzed with three-dimensional finite element method. The results were as follows : 1. Analysis according to using uni-or bi-cortical bone methods. 1) In the case of posterior vertical loading, bi-cortical method was superior to uni-cortical one in the viewpoint of the stress distribution effect and the higher bone density is, the better stress distribution. 2) There was no significant difference in the stress distribution pattern according to the intensity of load but the stress value is increasing. 3) In using bi-cortical method, the amount of deviation increased according to bone density and the tortion of mandible was observed in the uni-cortical model with low bone density. 2. Analysis according to implant location and prosthesis design 1) The F10 model and the model of pontic design showed better stress distribution than others. But stress was concentrated in specific area of posterior and anterior cantilevered models. 2) The model of low bone density showed higher stress value. The model of posterior cantilever showed the greatest stress variation according to the bone density. 3) The model of posterior cantilever showed the greatest amount of deviation and the smallest deviation was observed in F10 model.