| 摘要 |
A mouth guard for medical use is made of nonrigid plastic material and comprises a U-shaped portion forming a through opening to receive an instrument therein. The opening is shaped as a keyhole having a wider portion and a narrower portion that is open at one side of the mouth guard. Radially protruding flanges are provided at the ends of the annular portion. The instrument can be introduced laterally into the wider portion of the keyhole through the narrower portion under resilient yielding of the U-shaped portion.
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