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EFFICIENCY OF NEWER GENERATION PREADJUSTED EDGEWISE APPLIANCES

  • Andrews increased anterior tip due to “Wagon wheel effect” where tip was lost as torque was added(4:1).
  • He added additional tip of 100  in the upper anterior segment and 120 in the lower anterior segment.
  • Due to extra tip built into the anterior brackets there was the tendency for anterior teeth to incline forward during the initial phase of leveling and aligning.
  • Attempts were made to eliminate or minimize this effect by connecting anterior segments to posterior segments, usually with elastic forces. But this created a greater demand for anchorage control during this initial stage of treatment.
  • Increased elastic force resulted in  “roller coaster effect”.

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