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KMID : 0380319930510010129
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Journal of Korean Research Institute for Better Living
1993 Volume.51 No. 1 p.129 ~ p.140
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Soft Tissue Changes Associated with Orthodontic Retraction and intrusion of Maxillary and mandibular Incisors Four First premolar Extraction
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Abstract
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Abstract-The response of the soft tissue profile to retraction of the maxillary and mandibular incisors is still a matter of controversy. The purpose of present study was to improve the clinician's ability to predict the soft-tissue profile
changes
caused by retraction and intrusion of the maxillary and mandibular incisors by quantifying the profile changes, and identifying and quantifying the contribution of the most significant factors responsible for these changes. Cephalometric head
films
of
thirthy five treated Class I malocclusion. Korean adult female subjects were digitized and analyzed by means of a stepwise multiple regression analysis. The statistical assessment of the data suggested a complex interaction between dentition,
bony
structures and soft-tissue of the perioral area. The conclusions were as follows.
1. In general, changes in the upper and lower lip response to maxillary incisors retraction and intrusion were more predictable than those of the mandibular incisors.
2. The predictability associated with the soft-tissues response to maxillary and mandibular incisors intrusion was lower than retraction.
3. Clinically significant lip changes occuring in response to upper and lower incisors retraction and intrusion than other soft-tissue landmarks(nose and chin area) that means no mandibular rotation caused by molar extrusion.
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KEYWORD
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