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Comparison of a Modified RME Appliance with Other Appliances for Transverse Maxillary Expansion

Vergleich einer modifizierten GNE-Apparatur mit weiteren Apparaturen zur Transversalerweiterung der Maxilla

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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Aims and scope Submit manuscript

Abstract

Aim:

Plate appliances or fixed appliances for transverse expansion are used to treat lateral crossbites in early mixed dentition. The aim of this study was to compare these appliances’ dentoalveolar effects with those of a modified appliance with altered anchorage.

Patients and Methods:

Forty patients with early mixed dentition were examined. Twenty patients in the study group were treated with a modified RME appliance firmly anchored to the first permanent molars and with palatal rests in the first and second deciduous molar region. The appliance had wire extensions to the palatal aspects of the canines. One of the two comparison groups comprised 10 patients whose maxillary dental arch was transversally expanded with a split-plate appliance, and the other group contained 10 patients treated with a Hyrax-type rapid palatal expander fixed to the first permanent molars. After the plaster casts’ transverse parameters before and after expansion and after retention were measured to ascertain the treatment result, statistical analysis was performed applying the Wilcoxon test and Mann-Whitney U test.

Results:

The modified RME appliance expanded the anterior and posterior arch width highly significantly in transversal direction (p < 0.001). At the end of the retention phase, there were no significant differences between the modified RME appliance and the RME appliance with shortened arms. Compared to the splitplate appliance, the modified RME (p < 0.05) expanded the anterior arch width significantly.

Conclusion:

The modified RME appliance can be used effectively for rapid maxillary expansion in the early mixed dentition. At the end of the retention phase, the overall effect of the modified appliance is similar to that of the other methods.

Zusammenfassung

Ziel:

Zur Therapie eines seitlichen Kreuzbisses im frühen Wechselgebiss werden Plattenapparaturen oder festsitzende Geräte zur Transversalerweiterung verwendet. Ziel dieser Studie war es, die dentoalveolaren Auswirkungen dieser Geräte mit denen einer modifizierten Apparatur mit veränderter Verankerung zu vergleichen.

Patienten und Methodik:

Es wurden 40 Patienten im frühen Wechselgebiss untersucht. 20 Patienten der Untersuchungsgruppe wurden mit einer modifizierten GNE-Apparatur behandelt, die auf den ersten Molaren fest verankert war, palatinale Auflagen im Bereich der ersten und zweiten Milchmolaren besas und mit Drahtextensionen bis zu den Palatinalflachen der Eckzähne reichte. Die Vergleichsgruppen bestanden zum einen aus 10 Patienten, deren Oberkieferzahnbogen mit einer Plattenapparatur transversal erweitert wurde, und zum anderen aus 10 Patienten, die mit einer auf den ersten Molaren befestigten Hyrax-Schraube behandelt wurden. Nach Vermessung der transversalen Parameter der Modellpaare vor und nach Erweiterung sowie nach Retention, wurde eine statistische Auswertung durch den Wilcoxon- und Mann-Whitney-U-Test durchgeführt.

Ergebnisse:

Transversal vergrößerte die modifizierte GNE-Apparatur die anteriore und posteriore Zahnbogenbreite hoch signifikant (p < 0,001). Am Ende der Retentionsphase zeigten sich zwischen der modifizierten GNE-Apparatur und der GNE-Apparatur mit verkürzten Armen keine signifikanten Unterschiede. Im Vergleich zur Plattenapparatur erweiterte die modifizierte GNE die anteriore Zahnbogenbreite signifikant (p < 0,05).

Schlussfolgerung:

Die modifizierte GNE-Apparatur kann effektiv zur GNE im fruhen Wechselgebiss verwendet werden. Am Ende der Retentionsphase ist der Gesamteffekt der modifizierten Apparatur mit dem anderer Methoden vergleichbar.

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Authors and Affiliations

  1. Department of Orthodontics, University Hospital Saarland, Homburg/Saar, Germany

    Catharina Weyrich, Michael Noss & Jörg A. Lisson

  2. Klinik für Kieferorthopadie, Universitätsklinikum des Saarlandes, Kirrberger Str. 1, Gebäude 56, 66421, Homburg/Saar, Germany

    Catharina Weyrich

Authors
  1. Catharina Weyrich
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  2. Michael Noss
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  3. Jörg A. Lisson
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Corresponding author

Correspondence to Catharina Weyrich.

Additional information

Parts of this study were presented at the 82nd Annual Scientific Meeting of the German Orthodontic Society (DGKFO) in Mainz in 2009.

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Weyrich, C., Noss, M. & Lisson, J.A. Comparison of a Modified RME Appliance with Other Appliances for Transverse Maxillary Expansion. J Orofac Orthop 71, 265–272 (2010). https://doi.org/10.1007/s00056-010-9945-7

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  • DOI: https://doi.org/10.1007/s00056-010-9945-7

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