| 摘要 |
<p>Tooth polishing apparatus employs hand held electrically operated means and a polishing head impregnated with a liquid dentifrice rotated by the means, The head is placed in contact with the teeth to be cleaned, The head is generally conically shaped and porous, A shallow hollow cylinder containing dentifrice is secured to the base of the head with a discharge orifice communicating with the base of the head. Normally closed valve means disposed partially in the head and partially in the cylinder normally closes the orifice, When the head is inverted with the apex pointing downward and is pressed upward manually, the orifice is opened. The dentifrice then flows out of the orifice and into the head to impregnate it.</p> |
