| 摘要 |
The invention relates to an orthodontic device, called a Herbst mechanism, for the forward displacement of the lower jaw of a patient, using a pair of telescopic elements which each comprise a telescopic tube and a slide rod which with their free ends can be fixed to the upper or lower jaw of the patient by means of a joint. To achieve greater freedom of movement of the lower jaw while simultaneously maintaining the therapeutically desired forward-positioning force applied to said lower jaw, the invention provides for the telescopic elements to be rigid in the known manner when retracted but flexible when extended.
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