| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 88 === This thesis deals with the stress analysis on the prosthetics . Especially,implant-soft tissue retainted overdenture. Photoelasticity will be used to analyze two kinds of stud type attachment ,one is O-ring attachment and the other is magnetic attachment. Various loading conditions are applied to the overdenture,and the stress distribution near the implant is studied. Photoelastic birefringent material will be used to model the mandible. True size implant,attachment,and overdenture are setup to the model ,and exposed in a circularly polariscope system. Vertical and oblique occlusal force from 98.1 to 294.3N will be applied to the four location(43,46,33,36). Finally the result of photoelasticity pattern is analyzed to compared with each other between O-ring attachment and Magnetic attachment. The experiment shows that photoelasticity model reveals the stress in mandible successfully.When load is applied upon the implant(43,33),magnetic attachment type has much more stress than that of O-ring attachment type. When load is applied far away from the implant(46,36),O-ring attachment type has much more stress than that of Magnetic attachment type.
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