Journal Article

Soft tissue profile changes following maxillary protraction in Class III subjects

Nihat Kilic, Gulhan Catal, Ali Kiki and Hüsamettin Oktay

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 32, issue 4, pages 419-424
Published in print August 2010 | ISSN: 0141-5387
Published online January 2010 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/cjp119
Soft tissue profile changes following maxillary protraction in Class III subjects

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The dentoskeletal effects of maxillary protraction (MP) therapy have been extensively investigated, while those relating to soft tissue profile changes are limited. Thus, the aim of this study was to determine the degree of soft tissue profile changes following MP therapy. The material consisted of the cephalometric films of 24 female subjects (12.69 ± 1.08 years) with a Class III malocclusion who underwent MP therapy; these were compared with a control group of 15 females (12.13 ± 0.63 years) with a Class I occlusion and matched for chronological age and observation period. Cephalometric films were available for all subjects before (T1) and after (T2) treatment/observation. The initial measurements and treatment/control changes were compared between the groups by means of a Student's t-test.

The subjects in the MP group had a concave facial profile when compared with the controls. Comparison of the changes induced by MP therapy showed that the maxilla and surrounding soft tissues showed significant anterior movement (P < 0.001), whereas the mandible and surrounding soft tissues showed a backward and downward rotation. The improvement in facial profile predominantly resulted from maxillary soft tissue changes and mandibular hard tissue changes. The concave soft tissue profiles of the Class III subjects were corrected by anterior movement of the maxilla and a concomitant increase in the fullness of the upper lip. The concave skeletal profiles were, however, corrected mainly by backward and downward rotation of the mandible.

Journal Article.  3454 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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