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The European Journal of Orthodontics Advance Access published online on September 28, 2007
The European Journal of Orthodontics, doi:10.1093/ejo/cjm076
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© The Author 2007. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Effects on the sagittal pharyngeal dimensions of protraction and rapid palatal expansion in Class III malocclusion subjects

Ali Serdar Kilinç*, Seher Gündüz Arslan**, Jalen Devecioglu Kama**, Törün Özer** and Osman Dari***

* Private Practice, Gaziantep
** Department of Orthodontics, Faculty of Dentistry, University of Dicle, Diyarbakir
*** Private Practice, Antalya, Turkey

Address for correspondence Seher Gündüz Arslan, Dicle University, Dental Faculty, Department of Orthodontics, Diyarbakir, Turkey, E-mail: agseher{at}hotmail.com


  Abstract

This study examined the effects of rapid palatal expansion (RPE) and maxillary protraction headgear therapy in 18 patients with a skeletal Class III malocclusion (11 girls and seven boys; mean age 10.9 years) on upper airway dimensions compared with an untreated control group (nine girls and eight boys; mean age 10.9 years).

Pre- and post-treatment cephalometric radiographs were traced and analysed at similar time intervals. The average treatment time was 6.94 ± 0.56 months. Wilcoxon's test was used for intragroup comparisons and the Mann–Whitney U-test for intergroup comparisons.

A significant increase occurred in the maxillary forward position. Mandibular forward movement and downward and backward rotation were inhibited. In addition, the upper incisors were proclined (P < 0.001), and the lower incisors were significantly retroclined (P < 0.05). When the treatment and control groups were compared, the upper airway linear measurements (pns-ad1, pns-ad2, APW-PPW, APW'-PPW') and the nasopharyngeal area had increased in the treatment group.

These results demonstrated that maxillary expansion together with protraction of the maxilla improved naso- and oropharyngeal airway dimensions in the short term.


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