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The impact of extraction vs nonextraction treatment on soft tissue changes in Class I borderline malocclusions.
MedLine Citation:
PMID:  21932939     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Abstract Objective: To obtain through the use of discriminant analysis a relatively bias-free sample of extraction and nonextraction, Class I, equally susceptible to both treatments' malocclusions and to analyze retrospectively the soft tissue changes between the two different treatment groups. Materials and Methods: The cephalometric, model, and demographic data of 215 patients (females and males) fueled a stepwise discriminant analysis that provided the borderline homogenous subsample (30 extraction and 32 nonextraction cases). The pretreatment and postreatment cephalograms of the borderline sample were then subjected to a thorough soft tissue cephalometric analysis. Results: The results indicated that the three variables that played the most important role in the clinician's treatment decision were indicators of lower crowding, soft tissue convexity, and lower incisor protrusion. Significant differences (P < .001) regarding upper and lower lip protrusion, upper lip thickness (P < .05), and the nasiolabial angle (P < .05) occurred. Conclusion: Extraction treatment of Class I borderline malocclusions led to significant soft tissue changes regarding the upper and lower lip position and thickness as well as the nasiolabial angle, whereas the nonextraction treatment resulted in significant upper lip retraction and lower lip protraction.
Authors:
Dimitrios Konstantonis
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-20
Journal Detail:
Title:  The Angle orthodontist     Volume:  -     ISSN:  1945-7103     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370550     Medline TA:  Angle Orthod     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
a Research Fellow, Department of Orthodontics, School of Dentistry, University of Athens, Athens, Greece, and in Private Practice of Orthodontics, Athens, Greece.
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