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KMID : 0355620100360020094
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Journal of Korean Association of Oral and Maxillofacial Surgeons
2010 Volume.36 No. 2 p.94 ~ p.99
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Soft tissue changes in skeletal class II patients treated with bilateral sagittal split osteotomy advancement surgery
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Shin Hee-Jin
Kim Jin-Wook
Park Je-Uk
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Abstract
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The purpose of this study was to examine the soft tissue changes in skeletal class II patients after mandibular advancement by bilateral sagittal split ramus osteotomy (BSSRO). In Asian population, the incidence of skeletal class II malocclusion is lower than that of skeletal class III malocclusion unlike the caucasians. This study was conducted to figure out the ratio at which hard tissue and soft tissue changes after mandibular advancement by analyzing cephalograms of 13 patients that have undergone the mandibular advancement surgery. As a result, change ratios of Li, B′, Pog′according to the movement of li, B, Pog were found to be 0.59, 1.06, 0.82. Also, vertical height of vermilion zone (Si-Vb) and lower lip and chin (Si-Me′) were measured to evaluate vertical changes. Vermilion zone showed tendency to decrease by 1.02 mm on the average postoperatively, whereas vertical length of lower lip and chin showed tendency to increase by 3.57 mm on the average.
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KEYWORD
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Mandibular advancement surgery, Bilateral sagittal split ramus osteotomy (BSSRO), Soft tissue changes
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