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

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 b...

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Bibliographic Details
Published in:	European journal of orthodontics Vol. 30; no. 1; pp. 61 - 66
Main Authors:	Kilinç, Ali Serdar, Arslan, Seher Gündüz, Kama, Jalen Devecioğlu, Özer, Törün, Dari, Osman
Format:	Journal Article
Language:	English
Published:	England Oxford University Press 01-02-2008 Oxford Publishing Limited (England)
Subjects:	Activator Appliances Cephalometry - methods Child Dentistry Extraoral Traction Appliances Female Follow-Up Studies Humans Incisor - pathology Male Malocclusion, Angle Class III - therapy Mandible - pathology Maxilla - pathology Nasopharynx - pathology Oropharynx - pathology Orthodontics, Corrective - methods Palatal Expansion Technique - instrumentation Pharynx - pathology Rotation Time Factors
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Summary:	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.
Bibliography:	istex:4D99AF0C9D386380AC4FA7F271918B74E9E52FD2 ark:/67375/HXZ-71FPMM8N-C ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0141-5387 1460-2210
DOI:	10.1093/ejo/cjm076