Journal Article

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

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

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 30, issue 1, pages 61-66
Published in print February 2008 | ISSN: 0141-5387
Published online September 2007 | e-ISSN: 1460-2210 | DOI: https://dx.doi.org/10.1093/ejo/cjm076
Effects on the sagittal pharyngeal dimensions of protraction and rapid palatal expansion in Class III malocclusion subjects

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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.

Journal Article.  3420 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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