흡수된 상악구치부에서 임프란트 이식방법에 따른 응력분포 비교

The purpose of this study was to compare the stress distribution of the different treatment strategies for reconstruction of the resorbed posterior maxilla with implants. A three dimensional finite element analysis method was used to investigate these strategies. Six different finite element models, composed of cortical and trabecular bone involving a single implant, were constructed. Model 1 was monocortication by crestal cortical bone engagement only using a 3.75mm wide and 7mm long implant. Model 2 was bicortication of crestal cortical bone and sinus floor cortical bone using a 3.75mm wide and 8mm long implant. Model 3 was bicortication of crestal cortical bone and sinus floor cortical bone using a 5mm wide and 8mm long implant. Model 4 was bicortication of crestal cortical bone and sinus floor cortical bone penetration using a 3.75mm wide and 11mm long implant. Model 5 was maxillary sinus floor elevation by the osteotome technique using a 3.75mm wide and 11mm long implant. Model 6 was maxillary sinus floor elevation by the lateral antrostomy technique using a 3.75mm wide and 11mm long implant. 150N load applied vertically to the central fossa or buccal cusp tip of single-tooth prosthesis was used to evaluate the different models. The conclusions of this computer study are limited by the assumptions involved in the construction of the computer models. Within the scope of this study, the following observations were made. 1. The greatest stress was concentrated on the cortical bone area regardless of the loading conditions(both cental fossa and buccal cusp) 2. Buccal cusp loading caused more stress than central fossa loading in all models. 3. The stress distribution effect was greatest with a wide fixture implant. 4. With bicortication, the stress distribution effect of penetrating the maxillary floor was greater than just engaging the maxillary floor. 5. The stress distribution effect of the lateral antrostomy technique was shown to be greater than the osteotome technique, and the graft cancellous bone had little effect on the stress distribution.