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MODE OF ACTION OF FUNCTIONAL APPLIANCES..

  • Types of force employed in activator therapy:
  •   – sagittal: mandible downward and forward- muscle force to condyle and slight reciprocal force to maxilla
  •   – vertical: teeth and alveolar processes are either loaded or relieved of normal forces ; high construction bite  inhibits growth, direction and inclination of maxillary base
  •   – transverse: incorporation of screws and springs; midline correction
    • Class II div 1 with excessive vertical growth
    • Unloading of the condyle by forward posture of mandible
    • Retardation of horizontal and vertical maxillary growth by headgear
    • Margolis ACCO(1976); Jacobsson splint (1967); Stockli and Teuscher activator-headgear combination

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