Document Detail

Transverse dimensions of dental arches in subjects with Class II malocclusion in the early mixed dentition.
MedLine Citation:
PMID:  21515229     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The purpose of this study was to analyze the transverse dentoalveolar features of subjects with Class II Division 1 malocclusion in mixed dentition when compared to subjects with normal occlusion.
MATERIALS AND METHODS: The study was performed on 192 randomly selected subjects in the early mixed dentition. According to sagittal skeletal and occlusal features the sample was divided into two groups: 88 subjects (53 females and 35 males) with Class II skeletal disharmony and Class II, division 1 malocclusion (Class II Group, mean age 8 years and 10 months±11 months) and 104 subjects (66 females e 38 males) with dentoskeletal Class I relationships (Class I Group, mean age 9±1 years). The Class II group was further divided into two subgroups (maxillary protrusion group and mandibular retrusion group) on the basis of the skeletal characteristics. Intermolar and intercanine distances were measured on dental casts in both arches and posterior and anterior transversal discrepancy (PTID and ATID) were calculated.
RESULTS: Subjects with Class II malocclusion showed a significantly greater negative PTID (-2.1 mm) which was associated with a significantly reduced maxillary width with respect to the Class I group (-2.2 mm). The Class II group showed also a significantly greater negative ATID (-1.4 mm) when compared to the Class I group. Subjects with mandibular retrusion showed a significantly greater reduction both in the maxillary intercanine width (-1.7 mm). and in the maxillary intermolar width (-2.7 mm) with respect to the Class I group. Subjects with maxillary protrusion presented with a significantly greater constriction at the maxillary intermolar width (-1.7 mm) when compared to the Class I group.
CONCLUSIONS: Class II malocclusion with mandibular retrusion is associated with a significant constriction of the maxillary arch with reduced intercanine and intermolar widths. When Class II malocclusion is due to a maxillary protrusion the constriction at the maxillary arch is limited to the intermolar width.
Andrea Marinelli; Martina Mariotti; Efisio Defraia
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Publication Detail:
Type:  Journal Article     Date:  2011-03-24
Journal Detail:
Title:  Progress in orthodontics     Volume:  12     ISSN:  2196-1042     ISO Abbreviation:  Prog Orthod     Publication Date:  2011  
Date Detail:
Created Date:  2011-04-25     Completed Date:  2012-02-07     Revised Date:  2013-06-18    
Medline Journal Info:
Nlm Unique ID:  100936353     Medline TA:  Prog Orthod     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  31-7     Citation Subset:  D; IM    
Copyright Information:
Copyright © 2011 Società Italiana di Ortodonzia SIDO. Published by Elsevier Srl. All rights reserved.
Department of Orthodontics, University of Florence, Italy.
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MeSH Terms
Dental Arch / pathology*
Dental Models
Dentition, Mixed
Malocclusion, Angle Class II / pathology*
Overbite / pathology
Retrognathia / pathology
Statistics, Nonparametric

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

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