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PRE ADJUSTED EDGEWISE APPLIANCE (2)

  • When Angle described about molar relationship he stated that The mesiobuccal cusp of the upper first permanent molar should rest on mesiobuccal groove of the lower first permanent molar.
  • But non orthodontic models consistently demonstrated that “Distal surface of the distobuccal cusp of the upper first molar occluded with the mesial surface of the mesiobuccal cusp of the lower second molar”.
  • The edgewise appliance designed by Angle is ” Non programmed” because of the bilaterally symmetric design.
  • If located on the F A point & the FACC & used with unbent archwire, the brackets would cause the Inclination of the facial plane of each crown to be at 90 degrees to occlusal plane,
  • the occluso gingival positions of each crown to be irregular,
  • all crowns to have equal facial prominence & angulation of the FACC of each crown to be at 90 degree to the occlusal plane.

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