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Yeungnam Univ J Med > Volume 14(1); 1997 > Article
Yeungnam University Journal of Medicine 1997;14(1):197-208.
DOI:    Published online June 30, 1997.
Soft Tissue Change After Single Jaw(mandible) Surgery in Skeletal Class III Malocclusion.
Kwang Soo Park, Hee Kyung Lee, Byung Rho Chin
Department of Dentistry College of Medicine, Yeungnam University Taegu, Korea.
The purpose of this study was to evaluate the amount and interrelationship of the soft and hard tissue change after mandibular setback surgery in skeletal Class III malocclusion. The sample consisted of 25 adult patient (12 male and 13 female) who had severe anteropostrior skeletal discepancy. These patient had received presurgical orthodontic treatment and surgical treatment which is bilateral sagittal split ramus osteotomy. The presurgical and postsurgical lateral cephalograms were evaluated. The computerized statistical analysis was carried out with SPSS/PC program. The result were as follows: 1. After mandibular bilateral sagittal split ramus osteotomy, lower facial soft tissue horizontal posterior changes were high significance value. but vertical soft tissue changes were low significance value. 2. After mandibular bilateral sagittal split ramus osteotomy, relative upper lip protrusion increased(p<0.01) and relative lower lip protrusion decreased(p<0.01) and lower facial soft tissue thickness increased(p<0.01).
Key Words: Skeletal class III malocclusion, Mandibular bilateral sagittal split ramus osteotomy, soft tissue change
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