Document Detail

Bilateral asymmetry in the tooth relationships of orthodontic patients.
MedLine Citation:
PMID:  17685774     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To quantify the nature and extent of bilateral dentoalveolar asymmetries in routine adolescent orthodontic patients. MATERIALS AND METHODS: Eight left-right pairs of occlusal dimensions were measured from dental casts (n=211 subjects) with proportionate samples of class I, II, and III malocclusions. RESULTS: Directional asymmetry is a subtle, but pervasive feature of the dental arches, with systematically larger dimensions on the left side. Prior studies attribute this sidedness to compensations for hemispheric laterality. Patient's sex did not influence the magnitude of asymmetry, but patients with class II malocclusion exhibited significantly greater asymmetries, particularly in the anterior segment. Inspection suggests that this is attributable to the lack of coupling and guidance of the teeth between the jaws. There is a significant association between the severity of class II buccal-segment relationship and the extent of left-right asymmetries. CONCLUSION: Clinically, these lateralities need to be anticipated, particularly in class II malocclusions, and incorporated into the treatment plan.
Edward F Harris; Katherine Bodford
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Angle orthodontist     Volume:  77     ISSN:  0003-3219     ISO Abbreviation:  Angle Orthod     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-08-09     Completed Date:  2007-10-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370550     Medline TA:  Angle Orthod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  779-86     Citation Subset:  D; IM    
Department of Orthodontics, University of Tennessee, Memphis 38163, USA.
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MeSH Terms
Analysis of Variance
Dental Arch / pathology*
Dental Models
Facial Asymmetry / complications,  pathology*
Functional Laterality
Malocclusion / complications,  pathology*
Sex Factors

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