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Jungbauer, Rebecca; Thiradilok, Sasipa; Holberg, Christof; Rudzki, Ingrid; Proff, Peter; Kirschneck, Christian (2017): Veränderungen der Zahnbogendimension nach forcierter Gaumennahterweiterung bei Patienten mit Klasse-II-Malokklusion – eine retrospektive Modellstudie. In: Informationen Aus Orthodontie und Kieferorthopaedie, Vol. 49, No. 4: pp. 253-261
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The aim of this study was to assess changes in dental arch dimensions in patients with mixed dentition and dental class II after rapid maxillary expansion (RME), followed by fixed orthodontic treatment and retention compared to untreated controls. Dental casts of 32 patients, treated with RME, were retrospectively analyzed at 4 stages (before treatment, after RME, after occurred in controls. In the lower jaw a significant adaptive increase in arch width occurred during RME, which remained largely stable or increased until the end of retention. Treatment of patients with dental class II in the mixed dentition with RME is effective for correcting transversal deficits within the upper arch and accompanied by an increase of the transversal dimension within the lower arch. A final transversal expansion of 3.7-5.1 mm or 0.6-2.6 mm (upper/lower arch) could be maintained. Due to physiological width development, part of the therapeutic effects of RME can surely be ascribed to growth.