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KMID : 0355220090340030277
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Journal of Korean Academy Oral Medicine
2009 Volume.34 No. 3 p.277 ~ p.294
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Comparison of Soft Tissue Changes between Adolescents and Adults in Class Ⅱ Malocclusion Treatment
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Chang Na-Young
Cho Jin-Hyung
Lee You-Mee
Kang Kyung-Hwa
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Abstract
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The purpose of this study was to evaluate the soft tissue changes of class Ⅱ adolescents and adults in respect to extraction or nonextraction. The study included 68 patients from Wonkwang Dental Hospital were categorized to adolescent extraction group, adolescent nonextraction group, adult extraction group, adult nonextraction group. Cephalometric tracing of each patient was done to compare pretreatment and posttreatment of each group, to compare the changes between groups. And among the variables that showed significancy, correlation analysis and simple linear regression were done.
The results were as follows. 1. In both adolescents and adults after extraction treatment, nasolabial angle significantly increased and in both subjects after non extraction treatment, nasolabial angle significantly decreased. 2. In extraction subjects, there were positive correlation between the amount of treatment changes of vertical-U1 and E line-upper lip, the changes of vertical-L1 and E line-lower lip, the changes of vertical-L1 and vertical-Li. 3. In extraction subjects, simple regression equations of E line-upper lip, E line-lower lip, Li were calculated by regression analysis. According to the results above, it could be considered that the effect of the extraction or nonextraction treatment was greater than the effect of growth.
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KEYWORD
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Class Ⅱ, Adolescent, Adult, Soft tissue change
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