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Long-term effects of orthodontic interceptive expansion treatment

A retrospective study

Langfristige Auswirkungen einer kieferorthopädischen interzeptiven Expansionsbehandlung

Eine retrospektive Studie

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



The aim of this retrospective cohort study was to evaluate the long-term effects of interceptive orthodontic treatment with a removable expansion plate, based on transversal, sagittal, and vertical parameters.


A total of 90 patients needing interceptive treatment due to a crossbite or space deficiency were included. Records consisting of clinical photos, radiographs, and digital dental casts were collected for evaluation at two time points: the start of interceptive treatment (T0) and the start of comprehensive treatment (T1). Molar occlusion, overjet, overbite, presence and type of crossbite, mandibular shift, and transversal measurements were recorded for comparison.


After expansion with removable appliances, a significant increase in intermolar width was achieved and could be maintained over the observation period (p < 0.001). However, no significant changes regarding overjet, overbite, or molar sagittal occlusion were observed. Crossbite correction was successful in 86.9% of patients with unilateral crossbite and in 75.0% of patients with bilateral crossbite (p < 0.001).


Early expansion with a removable expansion plate is a successful method to correct crossbites and increase intermolar width in the early mixed dentition phase. Results remain stable until the start of comprehensive treatment in the permanent dentition.



Ziel dieser retrospektiven Kohortenstudie war es, die Langzeiteffekte einer interzeptiven kieferorthopädischen Behandlung mit einer herausnehmbaren Expansionsplatte anhand von transversalen, sagittalen und vertikalen Parametern zu bewerten.


Insgesamt 90 Patienten, die aufgrund von Kreuzbiss oder Engstand eine interzeptive Behandlung benötigten, wurden eingeschlossen. Die Dokumentation, bestehend aus klinischen Fotos, Röntgenbildern und digitalen Zahnabdrücken, wurde zu 2 Zeitpunkten ausgewertet: zu Beginn der interzeptiven Behandlung (T0) und zu Beginn der Hauptbehandlung (T1). Zum Vergleich wurden Molarenokklusion, Overjet, Overbite, das Vorhandensein eines und die Art des Kreuzbisses, die Unterkieferverschiebung und die transversalen Maße erfasst.


Nach der Erweiterung mit herausnehmbaren Apparaturen wurde eine signifikante Zunahme der Intermolarenbreite erzielt, die während des Beobachtungszeitraums beibehalten werden konnte (p < 0,001). Es wurden jedoch keine signifikanten Veränderungen in Bezug auf Overjet, Overbite oder molare sagittale Okklusion beobachtet. Die Korrektur des Kreuzbisses war bei 86,9% der Patienten mit einseitigem Kreuzbiss und bei 75,0% der Patienten mit beidseitigem Kreuzbiss erfolgreich (p < 0,001).


Die frühzeitige Expansion mit einer herausnehmbaren Dehnplatte ist eine erfolgreiche Methode zur Korrektur von Kreuzbissen und zur Vergrößerung der Intermolarenbreite in der frühen Wechselgebissphase. Die Ergebnisse bleiben bis zum Beginn einer umfassenden Behandlung im bleibenden Gebiss stabil.

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Correspondence to Maria Cadenas de Llano-Pérula DDS, PhD.

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Conflict of interest

A.-S. Van de Velde, L. De Boodt, M. Cadenas de Llano-Pérula, A. Laenen and G. Willems declare that they have no competing interests.

Ethical standards

The present is a retrospective cohort study in patients who underwent interceptive treatment by means of a removable expansion plate at the Department of Orthodontics, University Hospitals Leuven, Belgium. This study has been approved (registration number s56398) by the ethics committee of the University Hospitals Leuven. Consent to participate was not required since the ethical commission grants an exception of informed consents to retrospective studies.

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Van de Velde, AS., De Boodt, L., Cadenas de Llano-Pérula, M. et al. Long-term effects of orthodontic interceptive expansion treatment. J Orofac Orthop (2023).

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