Treatment Effects of the Maxillary Protracting Bow Appliance on Reversed Occlusion in Deciduous Dentition

DOI 5 Citations
  • Murakami Teruo
    Department of Orthodontics, Kyushu University Faculty of Dentistry
  • Matuda Masato
    Department of Orthodontics, Kyushu University Faculty of Dentistry
  • Suzuki Akira
    Department of Orthodontics, Kyushu University Faculty of Dentistry
  • Yokota Shigeru
    Department of Orthodontics, Kyushu University Faculty of Dentistry
  • Kajiyama Keijirou
    Department of Orthodontics, Kyushu University Faculty of Dentistry
  • Tamari Kazuhiko
    Department of Orthodontics, Kyushu University Faculty of Dentistry
  • Harada Tamotsu
    Department of Orthodontics, Kyushu University Faculty of Dentistry
  • Moro Naohiro
    Department of Orthodontics, Kyushu University Faculty of Dentistry

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Other Title
  • 上顎前方牽引装置の若年者への適用による治療効果について
  • 乳歯列期に未治療の反対咬合者と比較して

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Abstract

We applied MPBA modified facial masks to the skeletal reversed occlusion in the deciduous dentition and examined the effects of theappliance.<BR>The materials consist of 22 lateral cephalograms of 11 Japanese girls, which were taken before and after the treatment and 39 lateral cephalograms of 13controls, which were observed in natural growth.<BR>The following results were obtained:<BR>1) Forward movements of point A, Ptm and the unerupted upper permanent incisors were statistically significant. However counter-clockwise rotation of NF and forward movement of Or and PNS were not significant.<BR>2) Clockwise rotation of the mandible occured significantly.<BR>3) The ratio of the movement of the four points which contributed to the improvement of the reversed occlusion was that backward movement of point B and the labial tipping of the upper deciduous incisor were about one third of the overall movements respectively and forward movement of point A and lingual movement of lower deciduous incisor were about one sixth of the overall movements respectively.<BR>From these results, it was seen that the MPBA causes the effective changes in skeletal class III patients in deciduous dentition, namely growth acceleration on the maxilla and clockwise rotation on the mandible.

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