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The European Journal of Orthodontics 1986 8(1):21-29; doi:10.1093/ejo/8.1.21
© 1986 by European Orthodontic Society
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Changes during and following total maxillary osteotomy (le Fort I procedure): a cephalometric study

Mette Bundgaard*,{dagger},, Birte Melsen{dagger} and Sven Terp{ddagger}

* Royal Dental College, Institute of Orthodontics DK-8000 Aarhus C, Denmark
{dagger} Aarhus Cleft Palate Clinic Denmark
{ddagger} The University of Aarhus, Institute of Statistics

Mette Bundgaard, Royal Dental College, Institute of Orthodontics, Vennelyst Boulevard, DK-8000 Aarhus C, Denmark

Profile radiographs of 16 adult patients before, subsequent to, and one year following a total maxillary osteotomy were studied. The purpose of the study was to evaluate (1) osseous stability, (2) the relation between hard and soft tissue changes, and (3) the predictability of soft tissue changes on the basis of operative changes.

The displacement of the maxilla in relation to the cranial base was expressed as a translation and a rotation. Correlation and stepwise regression analyses were the statistical methods applied. Conclusions: Hard tissue changes were stable in the horizontal plane whereas maxillary intrusion continued following the operation. The ratio between hard and soft tissue changes was low for nose and subnasal structures whereas the upper lip seemed to follow the underlying structures. Soft tissue changes had a low predictability when related to x and y coordinates of the underlying hard tissue but were markedly influenced by the rotational changes with maxillary plane.


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