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KMID : 0362419930310030351
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Journal of Korean Academy of Prosthodontics
1993 Volume.31 No. 3 p.351 ~ p.384
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Three dimensional finite element analysis of mandibular stresses under complete dentures with variant artificial teeth formms and occlusal patterns
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Lee Cheol-Gyu
Kim Chang-Whe
Kim Yung-Soo
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Abstract
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Complete denture occlusion must be developed to function efficiently and with the least amount of trauma to the supporting tissues. For the preservation of supporting tissues, it is imperative to reduce to minimum the functional stress induced by
dentures. The magnitude of the horizontal component of functional stress contributed by various occlusal teeth forms has not been studied. This study was aimed to investigate the influence of different occlusal teeth from on the mode of distribution of the stresses in the mandibular tissue, and the displacement of lower dentures during the variant functional movement of mandible. For this study three dimensional finite element analysis was used. FEM models were created using commercial software Super Sap for IBM 32 bit computer. The model was composed of 3380 brick elements and 4346 nodes. @ES The results were as follows: @EN 1. The magnitude of stress was similar between two models in centric occlusion, in the case of anatomic model, the stress was concentrated on the buccal side of alveolar ridge beneath the bicuspids. 2. During the protrusive movement, the increasing of stress from the posterior to anterior part of mandible was seen in the case of anatomic model. 3. During the lateral movement, the stress of anatomic model was greater than that of nonanatomic model. 4. The stress of anatomic model was concentrated on the anterior region of residual ridge during the lateral movement. 5. In the case of anatomic model the anterior part of denture was displace d severely at the centric and lateral position, but the denture of nonanatomic model was displaced minutely at the protrusive and lateral position.
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