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KMID : 1036420120050010013
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대한치의학회 영문학회지
2012 Volume.5 No. 1 p.13 ~ p.20
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Finite Element Analysis of Stress Distribution around Patterned Implants
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Cho Lee-Ra
Huh Yoon-Hyuk
Kim Dae-Gon
Park Chan-Jin
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Abstract
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Purpose: The purpose of this study was to investigate the effect of patterning on the stress distribution in the bone tissue using the finite element analysis (FEA) model.
Materials and Methods: For optimal comparison, it was assumed that the implant was axisymmetric and infinitely long. The implant was assumed to be completely embedded in the infinitely long cortical bone and to have 100% bone apposition. The implant-bone interface had completely fixed boundary conditions and received an infinitely big axial load. von Mises stress and maximal principal stress were analyzed. Conventional thread and 2 or 3 patterns on the upper and lower flank of the thread were compared.
Result: The surface areas of patterned implants were increased up to 106~115%. The thread with patterns distributed stress better than conventional thread. Patterning in threads may produce more stress in the implant itself, but reduce stress in the surrounding bone. Stress patterns of von Mises stress were favorable with patterns, while the maximal principal stress was increased with patterns. Patterns in the lower flank showed favorable stress distribution.
Conclusion: The patterns in implant thread reduce the stress generated in surrounding bone, but the number and position of patterns were crucial factors in stress distribution.
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KEYWORD
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Finite element analysis, Implant, Patterning, Stress distribution, Thread
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