수종 골내 임프란트의 보철 수복물에 가해진 응력 분산에 관한 광탄성학적 연구

PHOTOELASTIC STUDY ON STRESS DISTRIBUTION OF THE FIXED PARTIAL DENTURES W ITH VARIOUS DESIGNED ENDOSSEOUS IMPLANTS

The purpose of this experimental study was to analyze the stress distribution from fixed partial dentures to the surrounding structures. This study was carried out on the experimental bridges with K-L blade, F.D.B.I-11 type, F.D.B.I-21 type, shape-memory metal blade and two-Apacerams as posterior abutment. The stress patterns and fringes were observed through the circular transmission polariscope. The results of this study were obtained as follows： 1. The stress was more concentrated to the roots apex than the implants. 2. In all blade implants, the stress was more concentrated to the distal side than the mesial side. 3. F.D.B.I-11 type was more stress concentrated than the 21 type. 4. Shape-memory metal blade was the most effective for stress distribution. 5. Apacerams were more stress concentrated than the blade types and in the model of Apaceram with rubber-ring, anterior root was tipped distally.