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THE STRESS ANALYSIS OF SUPPORTING TISSUE AND IMPLANT ACCORDING TO CROWN RESTORATIVE MATERIALS AND TYPE OF IMPLANT  

Choi Chang-Hwan (Department of Prosthodontics, College of Dentistry, Chonnam National University)
Oh Jong-Suk (Department of Microbiology, College of Medicine, Chonnam National University)
Vang Mong-Sook (Department of Prosthodontics, College of Dentistry, Chonnam National University)
Publication Information
The Journal of Korean Academy of Prosthodontics / v.40, no.1, 2002 , pp. 53-67 More about this Journal
Abstract
This study was aimed to analyze the stress distribution of implant and supporting tissue in single tooth implant restoration using Branemark $system^{(R)}$(Nobel Biocare, Gothenberg, Sweden) and Bicon system(Bicon Dental Implants, Boston, MA). Two dimensional finite element analysis model was made at mandibular first premolar area As a crown materials porcelain, ceromer, ADA type III gold alloy were used. Tests have been performed at 25Kgf vertical load on central fossa of crown portion and at 10Kgf load with $45^{\circ}$ lateral direction on cusp inclination. The displacement and stresses of implant and supporting structures were analyzed to investigate the influence of the crown material and the type of implant systems by finite element analysis. The results were obtained as follows : 1. The type of crown material influenced the stress distribution of superstructure, but did not influence that of the supporting alveolar bone. 2. The stress distribution of ceromer and type III gold alloy and porcelain is similar. 3. Stress under lateral load was about twice higher than that of vertical load in all occlusal restorative materials. 4. In Bicon system, stress concentration is similar in supporting bone area but CerOne system generated about 1.5times eater stress more in superstructure material. 5. In Branemark models, if severe occlusal overload is loaded in superstvucture. gold screw or abutment will be fractured or loosened to buffer the occlusal overload but in Bicon models such buffering effect is not expected, so in Bicon model, load can be concentrated in alveolar bone area.
Keywords
Implant; Stress distribution; Finite element analysis; Superstructure; Supporting alveolar bone;
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