고정성 보철물을 지지하는 골유착성 임풀란트의 위치에 따른 지지조직에서의 유한요소적 응력분석
Finite Element Stress Analysis on the Supporting Tissues depending upon the Position of Osseointegrated Implants Supporting Fixed Bridges
윤동주, 신상완, 서규원,
소속 상세정보
윤동주 ( Yoon Dong-Joo ) - Korea University College of Medicine Department of Dentistry
신상완 ( Shin Sang-Wan ) - Korea University College of Medicine Department of Dentistry
서규원 ( Suh Kyu-Won ) - Korea University College of Medicine Department of Dentistry
KMID : 0362819920120010185
Abstract
Many studies have been reported on the successful replacement of missing teeth with osseointegrated dental implants. However, little research has been carried out on the biomechanical aspect of the stress on the surrounding bone of the free-standing type of dental implant prostheses. This experimental study was aimed to analyze the stress distribution pattern on the supporting tissues depending upon the position of osseointegrated implants supporting fixed bridges. In the cases of unilateral partially edentulous mandible (the 2nd premolar and the 1st and 2nd molars missing), two osseointegrated implants were placed at the 2nd premolar and 2nd molar sites (Model A ), the 1st and 2nd molar sites (Model B, Anterior cantilevered type), the 2nd premolar and 1st molar sites (Model C, Posterior cantilevered type). Chewing forces of dentate patients and denture wearer were applied vertically on the 2nd premolar, the 1st molar, and the 2nd molar of each model. A 3 ?Unit fixed partial denture was constructed at each model and cantilevered extension parts were involved in Model B and Model C. Two dimensional finite element analysis was undertaken. The commercial software (Super SAP) for IBM 16 bit personal computer was utilized. The results were as follows : 1. The magnitude of applied load influenced on the total value of stresses, but did not influence on the pattern of stress distribution. 2. The magnitude of stress developed from the supporting tissues were in order of Model C,Model A,Model B. 3. High stresses were concentrated on the cervical and apical portion of the implant/bone interface. 4. A difference of the stress magnitude on the implant/bone interface between mesial and distal implant was most prominant in Model C and in order of Model A and Model B. 5. The stresses developed in Model A were evenly distributed throughout both implants. 6. The stresses concentrated on the cervical portion of cantilevered side were higher in the posterior cantilevered type than in the anterior cantilevered type.
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