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Permissible limit for mandibular expansion

Permissible Limit for Mandibular Expansion

  • Mandibular expansion is brought about by lateral tipping of the molars.
  • Excessive expansion may result in excessive buccal tooth inclination which may disturb the occlusal relationship.
  • Inclination movement was used as a clinical index  to determine the permissible limit of mandibular expansion.
  • Inclinations in occlusal surface of the first molar and intermolar width was measured before expansion, after expansion and before edgewise treatment.
  • Average change in intermolar width was 5.42mm and the average angle of buccal tooth inclination was 10.16˚.
  • No significant correlation was found between age prior to treatment and treatment period when they were compared with intermolar width increments and inclination angles.
  • Significant positive correlation between retention duration and amount of expansion.
  • According to the study 1mm of expansion is accompanied by 5˚ of moalr lateral tipping.
  • The regression coefficient of the angle of buccal tooth inclination to the increment of the intermolar width was 0.2.

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