The purpose of this study was to design the KH98 Standard Mandible, and evaluate the stress distribution on mandible with the traditional mechanical 3-D finite element method on the several situations of masticatory function. The 3-D finite element model was a 3-unit fixed partial denture having a mandibular 1st premolar and an implant replacing mandibular 1st molar as abutments. The stress distributions on model were evaluated under 133N vertical, 20N horizontal, end 45* oblique load.
Hypermesh 2.lb(Altair Co., USA) as a pre-, post-processor and NASTRAN(MSC Co., USA) as a solver were used to evaluate the stress distribution on mandible with the traditional mechanical 3-D finite element method for this study.
The results were as follows:
1. The KH98 Standard Mandible as a 3-D finite element model was very valuable as a visual means to evaluate the stress distribution on mandible on the variable several situations of masticatory function with ease.
2. In the 3-D finite element model , the area of maximum Von-Mises stress was shown at the mesio-cervical area of implant under 133N vertical load, and the linguo-cervical area of 1st. premolar under 20N horizontal and 45° oblique load. There was a cantilever effect in all models.
3. In making the implant supported superstructure, it was very important to design a proper occlusal surface for minimizing lateral force, because the stress distribution and value on 20N horizontal and 45° oblique load applied were similar to them on 133N vertical load.
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