| 摘要 |
A cup for use with the handpiece of an apparatus for applying gas to a portion of a tooth comprising a liner ( 18 ) configured and arranged to engage a gas dispensing handpiece, a body ( 16 ) defining a gas exposure chamber ( 28 ), the body having a higher resiliency to deformation than the liner. The body may be so deformable that it forms against the surface of a tooth to effect a seal and to expose a portion of the tooth to gas circulated in the chamber. The body may overmold the liner and may be formed of thermal-plastic rubber, and the liner may be formed of a plastic material. The gas exposure chamber may be cylindrical.
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