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Semirapid Maxillary Expansion

  • Conventional RME appliances widen the upper arch in the transversal dimension, mainly by the separation of the two maxillary halves.
  • Bonded RME appliances with occlusal coverage have been reported to have certain advantages over conventional devices.
  • Recent studies have stated that bonded RME appliances may expand the maxillary halves in a more bodily fashion and also reduce the risk of relapse. (Comparison of dentofacial changes with rigid acrylic bonded and Haas type banded rapid maxillary expansion devices. Turk J Orthod. 1997)
  • RME dramatically affects the surrounding skeletal structures.
  • Decreasing the tissue resistance and stimulating the adaptation process of the surrounding structures during RME proceduces stable long-term results.
  • Bishara and Staley suggested that the main resistance to midpalatal suture opening is probably not in the suture itself but in the surrounding structures such as sphenoid and zygomatic bones.
  • Eri et al evaluated the resistance of RME generated by the surrounding structures by the finite element method as applied to the three-dimensional model of a human skull.

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