The Open Dentistry Journal

ISSN: 1874-2106 ― Volume 14, 2020

Mandibular Behavior after Rapid Maxillary Expansion: A Clinical Study

Radwan A. Haffaf1, *, Abdul-kareem Hasan1, Mohammad Tizini1
1 Department of Orthodontics, Faculty of Dentistry, Tishreen University, Lattakia, Syrian Arab Republic.



Rapid Maxillary Expansion (RME) is a primary part of the contemporary orthodontic treatment plans. In addition to the maxilla, it is important to know its effect on the other dentofacial components. Some studies showed dentofacial changes after RME in the sagittal and vertical planes. The clinical importance of these changes is controversial.


To investigate the mandibular changes after RME as the only treatment intervention in the sagittal and vertical planes.


Twenty-eight growing patients aged 4-14 years were included in the current study. The bonded acrylic splint expander was used. Lateral cephalometric radiographs were taken at the beginning of the treatment (T1) and after a retention phase of six months (T2). The mandibular changes were assessed using vertical parameters (SN.MP, MMA, LAFH/TAFH, S.AR/AR.GO) and sagittal parameters (SNB, S.N.POG, N.A.POG). The changes between T1 and T2 were examined by paired samples T-test.


Two parameters showed a backward rotation in the vertical plane. The parameter S.AR/AR.GO showed a significant increase. The skeletal convexity increased with no clinical significance.


There were statistically significant changes in the sagittal and vertical planes with no clinical importance. RME may affect the mandibular condyle position.

Keywords: Rapid maxillary expansion, Hyrax expander, Mandibular changes, Clinical study, Growth period, Maxillary deficiency.

Article Information

Identifiers and Pagination:

Year: 2019
Volume: 13
First Page: 537
Last Page: 543
Publisher Id: TODENTJ-13-537
DOI: 10.2174/1874210601913010537

Article History:

Received Date: 28/08/2019
Revision Received Date: 30/10/2019
Acceptance Date: 18/12/2019
Electronic publication date: 31/12/2019
Collection year: 2019

© 2019 Haffaf et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: ( This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of orthodontics, Faculty of Dentistry, Tishreen University, Lattakia, Syrian Arab Republic;
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