下顎大臼歯欠損症例における小臼歯歯周組織の応力と歪みの分析

概要

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The purpose of this study was to investigate the stress/strain distributions around the mandibular premolar teeth in patients with loss of molar support. Subjects included female patients with loss of bilateral mandibular molar teeth that were restored with removable dentures (n=7, age from 51 to 69) and controls with complete dentition (n=7, age from 50 to 68). Occlusal contacts and bite forces were recorded under the maximum clenching with and without denture wearing. Finite element model of the mandibular first and second premolar teeth, periodontal ligament and bone was constructed for each patient based on radiographs and study models. The bite forces were applied on corresponding locations in the models to calculate the stress/strain of the periodontium. The forces, the maximum strain and stress of the molar loss group ranged widely among subjects, but they were all significantly higher than those of control group (p<0.05), and they were not prevented by denture wearing. Three subjects demonstrated high compressive cortical bone strain exceeding the estimated threshold of micro-damage of bone. The results suggest that the periodontium of the most posteriorly-located occluding premolars may become sensitive to bilateral loss of molar support if patients exhibit higher maximum bite forces.
2009-08-20