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tweeds

  • First degree anchorage preparation.
  • Applicable to all malocclusions with ANB angles ranging from 0* to 4*,in which facial esthetics are good and in which total discrepancy does not exceed 10 mm.
  • First degree means the mandibular terminal molars must always be upright and maintained in such an upright position as to prevent their being elongated when a class II intermaxillary elastic force is used.
  • The inclinations of the mandibular terminal molar is such that  the direction  of pull of the intermaxillary elastic force during function will not exceed  90* when related to the long axis of those teeth.
  • Second degree anchorage preparation.
  • Malocclusions in which the ANB  exceeds 4.5* and facial esthetics make it desirable to move point B anteriorly and point A posteriorly.
  • Usually class II in nature.The degree of distal tipping of the mandibular terminal molars is more severe than is necessary in first degree anchorage preparation.
  • The direction of pull of the class II intermaxillary elastics when related to the long axis of the terminal molars  should be greater than 90* so that the terminal molars will be further depressed rather than elongated.

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