Defacement of Toothbrushes
Isshu KAWANISHI, Munenori NAKAMURA, Maw-shyong LIEU, Motoaki TAKI, Toshimitsu TAKEI
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1971 Volume 13 Issue 2 Pages 88-94
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1971 Volume 13 Issue 2 Pages 88-94
On experimental study conserning the causality of deterioration or defacement of toothbrushes and the various influenses for brushing efficiency by its usage was conducted on the training nurses in the domitory where in a comparatively reguler life is established.
The test was conducted for two months and two different testing methods were applied by furnishing two groups with several kinds of brushes in the market.
To the one group, only a synthetic bristle brush was given without any specified instructions for brushing. To the another grop, both synthetic and natural bristle brushes were given with instructions as to its usage by the modified Stillman technique.
Findings of the above test results are as follows:
1) Transformation of brushes in the one group was full variety. A significant change was observed among 14% of the brushes and there was relatively small change in the remaining 86%.
2) In the another group, for synthetic brushes, a significant change was observed among 19% as compared to a small change in the remaining 81%. For natural brushes, a signifcant change was observed among 33% as compared to a small change in the remaining 67%.
3) It is a general trend for synthetic bristles to curl with usage and for natural bristles to gradually wear out with usage.
