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A comparative study of soft tissue changes with mandibular one jaw surgery and double jaw surgery in Class III malocclusion  

Chang, In-Hee (Department of Orthodontics, School of Dentistry, Kyung Hee University)
Lee, Young-Jun (Department of Orthodontics, School of Dentistry, Kyung Hee University)
Park, Young-Guk (Department of Orthodontics, School of Dentistry, Kyung Hee University)
Publication Information
The korean journal of orthodontics / v.36, no.1, 2006 , pp. 63-73 More about this Journal
Abstract
Numbers of postulations lie on the difference of integumental changes with two major surgical remedies of one jaw vs. two jaw surgery in skeletal Class III malocclusion. Accordingly it was the aim of the study to elucidate the skeletal profile changes with an accompanying disposition of soft tissues, consequently to yield the correlation and ratio of soft tissue changes with two types of surgical procedures, which in turn make it possible to predict the soft tissue outcomes by means of assembled regression equations. Cephalometric headfilms of fifty two adult skeletal Class III comprised of 26 maxillary advancement by Le Fort I osteotomy and mandibular setback by sagittal split ramus osteotomy simultaneously (double jaw surgery, group A), 26 mandibular setback alone (one jaw surgery, group B) were statistically analyzed. Group A manifested 72.4% soft tissue advancement to skeletal changes in the upper lip area, while group B appeared to have no statistically significant changes. The nasolabial angle showed more increment in group A than in group B, whereas the mentolabial angle illustrated more reduction in group B. The backward movement of soft tissue pogonion to skeletal change revealed 98% in group A, and 109% in group B. The double jaw surgery group characteristically revealed remarkable integ umental change in the upper lip area, while the one jaw surgery had major effects in the lower lip and soft tissue pogonion areas.
Keywords
Soft tissue changes; Orthognathic surgery; Class III malocclusion;
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