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KMID : 1004520100260030221
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Journal of Dental Rehabilitation and Applied Science
2010 Volume.26 No. 3 p.221 ~ p.239
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Effect of the Number and Location of Implants on the Stress Distribution in Three-unit Fixed Partial Denture: A Three-Dimensional Finite Element Analysis
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Lee Woo-Hyun
Lim Jong-Hwa
Cho In-Ho
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Abstract
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Bone loss may occur depending on the loading conditions. careful treatment planning and prosthetic procedures are very
important factors for the proper distribution of stress. Evaluate the stress distributions according to numbers and location
of implants in three-unit fixed partial dentures. A mandible missing the right second premolar, first molar and second molar
was modeled. Using the CT data. we modeled a mandible with a width of 15mm, a height of 20mm and a length of 30mm,
2mm-thickness cortical bone covering cancellous bone mallow. An internal type implant and A solid type abutment was
used. A model with 3 implants placed in a straight line, offset 1.5 mm buccally, offset 1.5 mm lingually and another model
with 3 implants offset in the opposite way were prepared. And models with 2 implants were both end support models,
a mesial cantilever model and a distal cantilever model. Three types of loading was applied; a case where 155 N was
applied solely on the second premolar, a case where 206 N was applied solely on the second molar and a case where
155 N was applied on the first premolar and 206 N was applied on the first and second molar. For all the cases, inclined
loads of 30 degrees were applied on the buccal cusps and vertical loads were applied on the central fossas of the teeth.
Finite element analysis was carried out for each case to find out the stress distribution on bones and implants. This study
has shown that prostheses with more implants caused lower stress on bones and implants, no matter what kind of load
was applied. Furthermore, it was found out that inclined loads applied on implants had worse effects than vertical loads.
Therefore, it is believed that these results should be considered when placing implants in the future.
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KEYWORD
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Cantilever, Implant, Offset, Stress
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