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  • Roth in 1975 evaluated the pre-  adjusted   bracket system after he had   used it for 5 years.
  •   In 1981 he modified the appliance by   altering the amount of pre-adjustment   built into the brackets.
  •   His objectives were to have the teeth in   overcorrected positions at the end of   treatment when unbent, full-sized wires   were used.
    • Mandibular incisor bonds:
    • Position the center of the slot so that the incisal edge of each incisor is 0.5 to 1mm shorter gingivally than the canine tip.
    • The lower six anterior brackets should be slightly more incisal relative to the L.A point, which will allow the leveling of the curve of spee.

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