새로운 의치용 임플란트 bar attachment의 유한요소분석

Abstract

There are clinical limitations in conventional complete dentures for rehabilitation of oral function of the fully edentulous patients. Retention of complete denture tends to be reduced due to resorption of residual alveolar ridge, and also, masticatory efficacy becomes reduced in order of deficiency of retention and stability. For the ways to overcome these limitations, the implant-supported overdenture is favorable for improvement of esthetics by supporting soft tissue, economical, simple, and easy for managing oral hygiene and proved that it is stable and effective treatment procedure on the basis of results of many clinical studies. The attachment used in the implant-supported overdenture does major role for not only connecting implants to denture, retention and stability of denture, but also transfer of occlusal force arised during mastication to peripheral bone tissue through implants. Recently, the development of implants in the relation of overdentures has recently become prosperous. However, the biomechanic analysis is rare even though the variable designs of implants for overdentures have been presented. Purpose of this study is to analyze biomechanic phenomenon of surrounding bone by analyzing stress distribution and displacement distribution of finite element model with new bar attachment of implant. The component of force applying on the implant fixture was set as the vertical and oblique directions, and the portion where load was applied was the center of bar and the point of 4.8mm left from the center. And 2-dimensional finite element analysis which was arised to the portion of implant-compact bone, and implant-cancellous bone interface was operated and the conclusions follows as: 1. Regard to analyze the stress which was applied to the implant fixture for overdentures, more stressful aspect is shown according to vertical force than to horizontal force, and in comparison with asymmetrical addition of force, the stress tends to be better distributed to compact bone and cancellous bone during being applied in the center of bar attachment. 2. As design of implant-supported overdenture, it is considered to be controlled that the load could be applied to the center of bar attachment for distribution of the stress.