치과 임플랜트에 의해 지지되는 금속 BAR의 지대주 종류에 따른 파절강도와 굽힘 모멘트에 관한 연구

A STUDY ON THE FRACTURE STRENGTH AND BENDING MOVEMENT OF THE METAL BAR SUPPORTED BY OSSEOINTEGRATED DENTAL IM P LA N T ACCORDING TO THE TYPE OF ABUTMENT

It has been recommended for rehabilitating severely resorbed mandible with implantsupported overdenture when the adequate retention and stability can not be obtained by the method of conventional complete denture. This study was performed to compare the fracture strength of the superstructure betweeen the Branemark conventional abutment and the UCLA abutment. The results of this study were as follows. 1. When the load was applied to the 7.0mm cantilever point from the fixture posterior of the metal bar, fracture strength was 50.92士 9.43(kg) in Branemark conventional system and 40.77± 5.27(kg) in UCLA system. Branemark conventional system had higher fracture strength value (p<C0.05). 2. When the load was applied to the center of metal bar, Branemark conventional system (180.97± 17.85) also showed the higher fracture strength than that of UCLA system (148.73± 4.90kg) (p<0.05). 3. The common area of fracture was the connector of metal bar regardless of loading position. The fracture strength of load on the center of metal bar was 3.5 times over than that of load on 7.0mm cantilever of metal bar. 4. From the viewpoint of fracture strength of metal bar, Branemark conventional system had more favorable situation than yCLA system due to its own double stress buffering mechanism (gold screw and abtftment screw).