| 摘要 |
PROBLEM TO BE SOLVED: To provide a brush holder for attaching a toothbrush to a vibrating dental handpiece, even when stress of vibration is concentrated on a bend of a vibration transmission member, preventing it from being fractured by metal fatigue.SOLUTION: A distal end (28) of a brush holder is formed by cutting a material so as to directly adjoin a front end of a second section (38) without any intervention of a round and to extend at a substantially right angle with the axis of the second section (38).SELECTED DRAWING: Figure 2 |
