Journal Article

Effects of rapid maxillary expansion on Holdaway soft tissue measurements

Nihat Kiliç, Ali Kiki, Hüsamettin Oktay and Abdulvahit Erdem

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 30, issue 3, pages 239-243
Published in print June 2008 | ISSN: 0141-5387
Published online June 2008 | e-ISSN: 1460-2210 | DOI:
Effects of rapid maxillary expansion on Holdaway soft tissue measurements

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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.

Journal Article.  2707 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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