Document Detail

Arch widths in class II-2 adults compared to adults with class II-1 and normal occlusion.
MedLine Citation:
PMID:  17685768     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To compare (1) arch widths in adults with Class II division 2 (II-2), Class II division 1 (II-1), and Class I normal occlusions, (2) genders, (3) gender dimorphism, (4) differences between maxillary and mandibular arch widths, and to (5) develop adult norms for arch widths. MATERIALS AND METHODS: Subjects were white Americans with no history of orthodontic treatment. Arch width dimensions measured were: intercanine, intermolar, and molar alveolar in both arches. Analysis of variance (ANOVA) and Duncan's test were used to compare groups. RESULTS: Comparison of pooled genders showed the II-2 group had maxillary arch widths significantly smaller than the normal occlusions and significantly larger than the II-1 group. All groups had similar mandibular intercanine and alveolar widths. The II-2 and II-1 groups had similar mandibular intermolar widths, both significantly smaller than normal occlusions. The II-2 group had a maxillary/mandibular intermolar difference significantly smaller than the normal occlusions, and significantly less negative than the II-1 group. Gender comparisons in two of six widths showed normal and II-2 male subjects were similar, and in six of six widths normal and II-2 female subjects were similar; in five of six widths II-2 and II-1 male and female subjects were similar. Gender dimorphism occurred in five of six widths in normal occlusions, four of six widths in II-2, and one of six widths in II-1. CONCLUSIONS: Arch width dimensions of II-2 subjects were intermediate between normal and II-1 occlusions. In both Class II malocclusions, the process that narrows arch widths was more pronounced in male than in female subjects.
Joel Huth; Robert Newton Staley; Richard Jacobs; Harold Bigelow; Jane Jakobsen
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Publication Detail:
Type:  Comparative Study; 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:  837-44     Citation Subset:  D; IM    
Department of Orthodontics, College of Dentistry, University of Iowa, Iowa City 52242, USA.
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MeSH Terms
Analysis of Variance
Dental Arch / pathology*
Dental Occlusion*
Malocclusion, Angle Class I / pathology*
Malocclusion, Angle Class II / classification,  pathology*
Mandible / pathology
Maxilla / pathology
Sex Characteristics

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