| 摘要 |
An exerciser for muscles that protract and depress the mandible. A headpiece is adapted to fit around an upper rearward portion of a human head. A chin strap extends around the chin and is coupled to the headpiece at such an angle that the chinstrap is urged against the chin in opposition to both protraction and depression of the chin. The exerciser finds an application in treating temporomandibular joint dysfunction (TMD).
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