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The European Journal of Orthodontics Advance Access originally published online on October 11, 2006
The European Journal of Orthodontics 2007 29(1):26-30; doi:10.1093/ejo/cji069
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© The Author 2006. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

A photogrammetric technique for the analysis of palatal three-dimensional changes during rapid maxillary expansion

Ida Marini*, Giulio Alessandri Bonetti*, Vladimiro Achilli** and Giuseppe Salemi**

* Department of Periodontology, School of Dentistry, University of Bologna
** Department of Architecture, Urban Planning and Surveying, Faculty of Engineering, University of Padua, Italy

Address for correspondence Dr. Ida Marini, Via S. Angela Merici, 60, I-25123 Brescia, Italy, E-mail: idmarini{at}tin.it


  Abstract

The aim of this study was to assess, by a digital photogrammetric technique, the relative dimensional changes before and after rapid maxillary expansion (RME). The transverse diameters and volumetric variations of the palate were measured by photogrammetry on study casts taken at three different phases of therapy: at the beginning of treatment (T1), on removal of the rapid expander, after expansion and retention for three months (T2), and six months after appliance removal (T3).

The sample consisted of 30 children, (age range 7–8 years), all with a crossbite; 15 were angle Class I, six Class II and nine Class III. They were treated with an acrylic splint expander with two turns per day until the maxillary molar palatal cusps were in contact with the mandibular molar buccal cusps. The RME device was used as a passive retainer for three months, after which it was removed. During the following six months, no retention was used and no orthodontic treatment was undertaken.

The findings demonstrated a significant relapse (P < 0.001) in the dental transverse diameter in all patients six months after appliance removal, although the palatal volume remained stable.


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