[in Japanese]

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In orthodontics, by applying a correcting force to the target tooth using a brace, reaction occurs in the periodontal tissue at the root of the tooth and the tooth is moved. A tooth to be moved generates a reaction force around the cone of the tooth and produces stresses, but it is very difficult to know the 3 dimensional actual stress distribution. So, we make a finite element model which consists of a tooth, periodontal membrane and alveolar bone to analyze stress distribution. A canine is selected as a sample tooth to study and various FEM models of different element type are investigated to study the effects of modeling. Results show that a model using a shell element instead of a solid type for a tooth can give a proper result.

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We propose a numerical method for blood flows in the complex vessel. The method is based on the fractional step method, the CIP method, the level set method and the ghost fluid method. We applied the method to blood flows in cerebral artery with five aneurysms.

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