The purpose of the present study was to assess the relationship between periodontal condition and nutritional status in young patients with early-onset periodontitis. Ten female early-onset periodontitis subjects (EOP), (mean age 24.9±7.1), and 10 female subjects with gingivitis or mucogingival problem (G), (mean age24.7±5.1), were selected. General and periodontal conditions of all subjects were examined. Nutritional status based on the 5 days intakes of nutrients was analysed and the measured values with recommended dietary allowances for the Japanese (4th revision, 1989) were compared. All subjects in both groups were of average build with non contributory medical history. Numbers of present teeth and rates of treated teeth were 28.0±0.7, 37.8±3.0% in EOP group and 27.9±1.0, 29.6±5.8% in G group as an average, respectively.Rates of periodontally diseasedteeth were 90.3±3.0% in EOP group and 25.8± 2.8% in G group as an average, respectively. Periodontal conditions in EOP group were more severe than those inG group, significantly (p<0.01). Dificiency of energy, iron and green vegetables in both groups were found. Protein, lipid, iron, vitamin A, vitamin B 1, vitamin C and green vegetables in EOP group were lower than those in G group. ET-index, which indicated the frequency of the sugar intakes, plaque forming index, which indicated the ratio of plaque forming diets, and SH ratio, which indicated theratio of soft diets, were high in both groups. There was a significant positive correlation between SH ratio and periodontal conditions (p<0.05). These results suggest that nutritional disorders in young age may have influence on the prognosis of periodontal disease.

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In order to study the characteristic behavior during mastication of“grain type chewing materials”in human subjects, electoromyograms (EMGs) were recorded fromthe masseter muscle and the mylohyoid muscle in ten adult subjects. Cooked rice (CR) was used as a chewing material. The number of chewing strokes and the chewing time until the final swallowing action incresed as the increasing of CR volume. While, in the case of mastication of the CR mixted with small amount of water, the number of chewing strokes and the chewing time decreased in all subjects. The texture of the CR was measured. When a small amount of water was added to the CR, cohesiveness and adhesiveness of the CR was significantly decreased in the texture profile analysis. This result suggests that the decrease of cohesiveness and adhesiveness in CR may be related to the decrease in chewing strokes and chewing time.

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This study, based upon analysing the change of lower limb muscle strength by improving occlusion of the teeth, is aimed at linkage among the following three fields: oral science, neurophy-siology and physical response. The subject was a male water-polo player of top-class in Japan. We measured isokinetic muscular strength and occlusion before and after the dental treatment. Concentric and eccentric isokinetic muscular strength of knee joint extension and flexion were measured by using MYORET-RZ450. Occlusion was measured by using DENTAL OCCLUSION PRESSUREGRAPH FPD-703. The results are summarized as follows;
1) The values of occlusal surface and biting force remarkably increased after dental treatment .
2) The largest increase during the change in isokinetic muscle strength, before andafter improving occlusion, was at the rate of 240 degree / second. Furthermore the peak torque of eccentric contraction increased more than that of conccentric contraction.
3) The left / right ratio changed in proportion to eccentric contraction for extensor and flexor developed a marked tendency in proportion to the increase of angle - speed.
4) Mal - occlusion was artificially created by mounting partial mouthpieces: One at the right molar and another one at the between the both canine teeth. The values of eccentric contraction under malcondtionwere lower than those without it. However. the values of concentric contractionwere not changed by mounting the partial mouthpiece anywhere.

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