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The European Journal of Orthodontics 2008 30(3):239-243; doi:10.1093/ejo/cjn004
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© The Author 2008. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Effects of rapid maxillary expansion on Holdaway soft tissue measurements

Nihat Kiliç, Ali Kiki, Hüsamettin Oktay and Abdulvahit Erdem

Department of Orthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey

Address for correspondence Dr Hüsamettin Oktay, Atatürk Üniversitesi, Dis Hekimligi Fakültesi, Ortodonti Anabilim Dali, 25240-Erzurum, Turkey, E-mail:hoktay{at}atauni.edu.tr


  Abstract

The objective of the present study was to evaluate short-term soft tissue changes caused by rapid maxillary expansion (RME) in 18 subjects (15 females and 3 males) (mean age 13 years 6 months) with a bilateral posterior crossbite. Lateral cephalograms of the patients were obtained at three different time points: before RME (T1), after maxillary expansion (mean = 0.82 month) (T2), and after retention (mean = 5.95 months) (T3). Holdaway soft tissue measurements were used for the evaluation of soft tissue changes. Data were analysed statistically by means of paired t-tests.

The facial soft tissue angle decreased (P < 0.05), and H angle and skeletal profile convexity increased significantly (P < 0.001) at T2. During T3, the increase in the facial soft tissue angle and the decrease in H angle were minimal and not significant, while skeletal profile convexity significantly decreased (P < 0.001). The results of this study indicate that RME may affect Holdaway soft tissue measurements.


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