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Evolution of Functional Appliances

Evolution of Functional Appliances

  • His teachings had an enormous impact on orthodontics in many parts of europe and his followers limited themselves to the exclusive use of the activator.
  • Fixed appliances were rejected in europe due to:
  • Concern over increased root resorption.
  • Economic reasons : British health service plan.
  • Outstanding clinicians succeeded in extending the possibilities of removable appliances.
  • Lack of knowledge of fixed appliances.
  • Changes of head posture alter the magnitude and direction of force
  • Change in mandibular position varies force vectors acting on mandible and different muscle groups
  • Plane of sleep( light or deep), intraoral air pressure, dream cycle, state of mind also affect activator response during sleep.

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