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KMID : 0988420010130040467
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Journal of Dental Science (C.N.U.)
2001 Volume.13 No. 4 p.467 ~ p.482
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The stress analysis of supporting tissue and implant according to crown restorative materials and type of implant
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Abstract
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This study was aimed to analyze the stress distribution of implant and supporting tissue in single tooth implant restoration using Bra˚emark system^®(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 10㎏ load with 45° 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 greater stress more in superstructure material.
5. In Bra˚emark models, if severe occlusal overload is loaded in superstructure, 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.
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KEYWORD
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