抄録
Although there are many kind of toothbrush handle. the design based on the objective viewpoint is almost nonexistent. In this study, ergonomic methodology including electromyogram and subjective ratings was employed as the evaluation tool of the handle. As a result, optimal thickness of the handle is approximately φ 17.5 mm for the lower part and lO mm at least, 12.5 mm or more for the upper part. The form of crosssection on the upper part is recommended to be nearly circular form and suggested that flat-iike element should be adopted 40 it for more handling stability. The result of this research will become one of an important guideline for designers in future.
