치과임프란트 보철에 있어 경사지대주의 경사각에 따른 응력의 유한요소법적 분석

The purpose of this study was to evaluate and compare the stress distribution in the implant and bony tissue according to the different angulations of angulated abutment. Nine finite element models with different angulations(0°, 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°) were designed. Two dimensional finite element analysis was used for this study. The results were as follows 1. All the tested angulated abutment demonstrated maximum stress value at the cervical portion of implant in the interface A and B. 2. Zero-degree angulated abutment showed less stress value than any others. 3. The Angulated abutments with 5 degree and 10 degree demonstrated higher stress concentration than that with zero degree in interface A and B. The abutments over 20 degree showed very high stress value at the opposite site of angulated cervical portion. 4. The angulated abutments over 30 degree showed very large stress distribution inside of implant fixture. 5. The agulated abutment with 15, 20 and 25 degree showed low stress value at the angulated cervical portion. But the stress increased in the angulated abutment over 30 degree. 6. The angulated abutment over 30 degree demonstrated severe stress concentration at the opposite of angulated cervical portion. 7. From the view point of stress distribution, the use of abutments more than 30° angulation seem to be very disadvantageous