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KMID : 0355620010270020111
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Journal of Korean Association of Oral and Maxillofacial Surgeons
2001 Volume.27 No. 2 p.111 ~ p.117
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THE THREE DIMENSIONAL FINITE ELEMENT ANALYSIS OF STRESS ACCORDING TO IMPLANT THREAD DESIGN UNDER THE AXIAL LOAD
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김우택/Woo Taek Kim
차용두/오세종/박상수/김현우/박양호/박준우/이건주/Yong Doo Cha/Se Jong Oh/Sang Soo Park/Hyun Woo Kim/Yang Ho Park/Jun Woo Park/Gun Joo Rhee
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Abstract
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There are three disigns of thread form in screw type implants: V-thread, Reverse buttress thread and Square thread. The purpose of this study was to find out how thread form designs have an influence on the equivalent stress, equivalent strain,
maximum
shear stress and maximum shear strain and which design of thread form generates more maximum equivalent stress and strain. 3-D finite element analysis was used to evaluate the stress and strain patterns of three tread types.
The results of this study were as follow.
1. Under the 200N of axial load, the value of maximum equivalent stress is smallest in square thread and there is no significant difference between that of V thread and reverse buttress thread.
2. Under the 200N of axial load, the value of maximum equivalent strain is largest in V thread and smallest in square thread.
3. Under the 200N of axial load, the value of maximum shear stress is smallest in square thread and there is no significant difference between that of V thread and reverse buttress thread.
4. Under the 200N of axial load, the value of maximum equivalent strain is largest in V thread and there is no significant difference between that of square thread and reverse buttress thread.
5. Above results show that the square thread has special advantages in stress and strain compared with other thread types, especially in shear stress which is most determinant to implant-bone interface. Considering the superior biomechanical
properties
of square form implant, we presume that square form implant has better clinical results than the other types of implants in the same clinical conditions.
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KEYWORD
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