Document Detail

Skeletal jaw relationships: a quantitative assessment using elliptical Fourier functions.
MedLine Citation:
PMID:  7978525     Owner:  NLM     Status:  MEDLINE    
Elliptical Fourier functions (EFF) were generated for the boundary outlines of the hard tissue craniofacial complex including the maxilla, mandible, and cranial base in order to quantitatively describe adult patients (n = 98) who were initially classified into nine skeletal groups by a combination of conventional cephalometric measures and clinical judgement. The mean residual fit of the EFF-predicted points and the original digitized data for the individual subjects ranged from .42 mm to .61 mm with a mean of .52 mm suggesting an accurate fit. Visual inspection of the individual plots confirmed this. Predicted classifications from a step-wise discriminant analysis based on EFF amplitudes were compared with the original classifications. The discordance rates for A-P and vertical plane classification were 21% and 13% respectively with an overall discordance rate of 33%. In general, a cluster analysis using EFF amplitudes did not identify clusters very similar in membership to the original groups; however, it was marginally successful in identifying members of the more severe groups and, like discriminant analysis, appeared to be more sensitive to vertical morphological differences. The overall lack of agreement between classifications and clusters based on EFF amplitudes and the original classifications may indicate that traditional skeletal categories such as those used in this study do not actually represent discrete groups.
B F Lowe; C Phillips; P E Lestrel; H W Fields
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Angle orthodontist     Volume:  64     ISSN:  0003-3219     ISO Abbreviation:  Angle Orthod     Publication Date:  1994  
Date Detail:
Created Date:  1994-12-01     Completed Date:  1994-12-01     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370550     Medline TA:  Angle Orthod     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  299-308; discussion 309-10     Citation Subset:  D; IM    
Dept. of Orthodontics, UNC School of Dentistry, Chapel Hill 27599-7450.
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MeSH Terms
Analysis of Variance
Cluster Analysis
Discriminant Analysis
Fourier Analysis
Jaw Relation Record*
Malocclusion / classification,  pathology
Malocclusion, Angle Class II / pathology
Malocclusion, Angle Class III / pathology
Mandible / anatomy & histology*
Maxilla / anatomy & histology*
Radiographic Image Enhancement
Skull / anatomy & histology*
Vertical Dimension
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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