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Root Resorption

    • To determine the effect of  on various fixed appliance techniques on root resorption.( beggs, edgewise, straight wire, bio-efficient, speed).
    •       Beck and haris 1994 –  no statistical difference between begg and tweed edgewise technique.
    •      Mc Nab et al 2000- reported high incidence rate of resorption in patients treated with begg’s techique and rate of resorption increased by 3.72 times when extractions were performed as apart of treatment procedures.
    •    L’Abee and Saderink – observed root resorption in all three stages of treatment of beggs mechanotherapy, with the second stage exhibiting the least severity.
    •   Some authors consider Jiggling forces or round tripping in mechanotherapy to be a cause of increased resorption.
    •    Mayerol  reported low rate of resorption in beggs mechanics as lighter forces are used.
  • Authors have evaluated abnormalities in root shape and its association with root resorption
  •  Among differently shaped root ends least resorption was observed in blunted roots and greatest was seen in tapered or pointed roots.
  • Mirabella and artun  1995 evaluated for individual variation and concluded that long ,narrow and deviated roots have increased risk of root resorption
  • REASON- the pressure from the axial component of orthodontic forces is felt more at the root apex , which are at abnormal shape .This resulted in localized ischemic necrosis ,which denudes the precementum and cementoblasts ,permitting colonization of dentinoclasts
  • Dilacerated roots are more prone to root resorption
  • Levander and malmgren 1998
  • Noted greater root resorption with blunted roots.
  • The conclusion is that any abnormal shape in pretreatment radiographs should be monitered with caution throughout treatment.

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