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골유착성 임프란트에 의해 지지되는 새로운 설계의 Hybrid Prosthesis
이종석,신상완,Lee, J.S.,Shin, S.W. 대한심미치과학회 1999 Journal of the Korean Academy of Esthetic Dentistr Vol.8 No.1
A fixed bridge is preferred as a prosthetic option supported by oral implants. However, it is very difficult to re tore edentulous maxilla with fixed prosthesis in cases with improper position and angulation of fixtures, abnormal jaw relation, and need for proper lip support. Six Br${\aa}$nemark implants were installed in edentulous maxilla opposing mandible with natural dentition. A removable hybrid prosthesis attached to a bar milled by 6 degrees was therefore designed to overcome such disadvantages of fixed prosthesis. Lateral stabilization of removable prosthesis was obtained by framework closely fitting the milled bar. Support for the prosthesis was ensured by three elevated areas on the bar. Two precision attachments(CEKA REVAX) provided appropriate direct and indirect retention without influencing support. A clinical and laboratory procedure was presented.
이종석(J. S. Lee) 한국해양공학회 1989 韓國海洋工學會誌 Vol.3 No.1
The behaviors of indeterminate framed structures, subject to variable repeated loads, are investigated through model tests. Test results are compared with the theoretical results which obtained earlier by the author. And then it is studied that how test results are coincident with existing theory of shakedown.<br/> Through this research, it is presented how to investigate shakedown problems in the future.
이종석(J. S. Lee) 한국해양공학회 1988 韓國海洋工學會誌 Vol.2 No.2
For the collapse of structures due to the variable repeated load, two types of collapse mechanisms, i.e., incremental collapse and alternating plasticity, exist. Under the similar variable repeated loading conditions there exists shakedown state in the structures. In shakedown state, the number of plastic hinges are not increased and all further loading will be resulted in the elastic moment changes. Namely, under the shakedown state, structures do not collapse.<br/> In this investigation, shakedown analysis are performed by composing new computer programs. Basic theories employed to compose the programs are as follows.<br/> 1. Newton-Raphson methods are added to the existing matrix method for the plastic analysis.<br/> 2. An effort to construct the stiffness of axial and bending springs attached at both ends of the member has been made.<br/> By using the programs developed, it is possible to anticipate the collapse mechanisms(Incremental collapse, alternating plasticity). Lastly for the verification of performance of the program, demonstration examples have been solved and the results are compared with other sources.