| 摘要 |
An anterior traction myotatic chin strap treats mandibular retrognathism by exciting the myotatic reflex action of mandibular advance, thereby producing the best conditions to stimulate the forward growth of the mandible to a maximum, this being the first objective in the treatment of mandibular retrognathism or Skeletal Class II Malocclusion, in which a poor mandibular growth in relation to the growth of the upper maxilla in the anteroposterior direction, is produced. The myotatic chin strap, due to its support on the labiomenton groove and due to its backwards and slightly downwards component force by means of a band placed behind the neck and which is joined to the lower arms of the chin strap by smooth rubber bands, excites the myotatic or stretch reflex of the muscles which advance and close the mandible, maintaining a functional position in the advance and closure of the mandible as a reflex reaction to the applied backwards and slightly downwards pull, provided that the intensity of this pull is minimum. The myotatic chin strap, through its upper arms connected to other smooth elastic bands, can exert a pull on an orthodontic or orthopedic apparatus placed in the patient's mouth to correct the defects of his teeth, wherefore the teeth will occupy a more anterior position at the end of the treatment, thereby obtaining the best therapeutic results. |
