成人における手用歯ブラシによる歯みがき圧および歯みがき動作の回数と歯垢清掃効果との関係について
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概要
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A study was made of 12 male adults from 20 to 28 years who brushed the facial and lingual surfaces of their upper and lower anterior and posterior teeth using three kinds of manual toothbrushes, which differed in the shape of the shank, the number of tuft, and stiffness, but were the same in the brushing plane (straight).<BR>The three kinds were the Rolling type toothbrush (tufts are of a multitufted design and stiffness in medium), the Straight type toothbrush (tufts are of a tufted design and soft texture), and the Banet type toothbrush (the handle has a curved oval concave in the shank in the direction of the brushing plane and is at an angle of 10° with respect to the brushing plane or head, tufts are of a multitufted design and stiffness is medium). The adults followed their habitual brushing method for 20 seconds in each area.<BR>Quantitative determinations were made of brushing force, brushing strokes per 20 seconds and percent of debris removal.<BR>(debris index before brushing minus debris index after brushing/debris index before brushing times 100%)<BR>The debris removal for each toothbrushing area and each toothbrush was discussed on the basis of relaticns between brushing force and the number of brushing strokes, and between the percent of debris removal and the product of brushing force times the number of brushing strokes.<BR>Brushing force was generally 200-1, 000 g and the number of brushing strokes was 30-100 per 20 seconds.<BR>Variations in brushing force and the number of brushing strokes were due more to individualities than to toothbrushes and brushing areas.<BR>The above findings meant that habits appeared with individualities in brushing procedures. Brushing force and the number of brushing strokes were inversely proportional among adults who showed a 100 percent debris removal, but were not necessarily so among the examinees whose debris removal was less than 100 percent.<BR>The percent of debris removal was generally proportional to the product of brushing force times the number of brushing strokes except in the labial surface area of the upper and lower anterior teeth and the lingual surface area of the upper and lower right posterior teeth. The percent of debris removal was higher in the former area and less in the latter area than in the other areas.<BR>Those findings seem to indicate that the difficulty or easiness of brushing procedures was reflected on the brushing areas.<BR>The brushing areas did not always show the same percent of debris removal depending upon the kind of toothbrush used. A Banet type toothbrush was most effective for the facial surfaces of the upper anterior and posterior teeth as was the case with a Straight type toothbrush in brushing the lingual surfaces of the upper and lower anterior teeth.<BR>The present experimental data revealed that the percent of debris removal was better evaluated by the product of brushing force times the number of brushing strokes than by brushing force only.
- 有限責任中間法人 日本口腔衛生学会の論文