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Changes in occlusal relationships in mixed dentition patients treated with rapid maxillary expansion.
MedLine Citation:
PMID:  19905846     Owner:  NLM     Status:  In-Data-Review    
ABSTRACT Objective: To prospectively measure occlusal changes in mixed dentition patients who underwent a standardized early expansion protocol. Materials and Methods: The treatment sample consisted of 500 patients who were assigned to three groups according to molar relationship: Class I (n = 204), end-to-end (n = 166), and Class II (n = 130). All patients were treated with a bonded rapid maxillary expander (RME) followed by a removable maintenance plate and a transpalatal arch. Mean age at the start of treatment was 8.8 years (T(1)), with a pre-phase 2 treatment cephalogram (T(2)) taken 3.7 years later. The control sample consisted of the cephalometric records of 188 untreated subjects (Class 1, n = 79; end-to-end, n = 51; Class II, n = 58). Results: The largest change in molar relationship was noted when the Class II treatment group (1.8 mm) was compared with the matched control group (0.3 mm). A positive change was seen in 81% of the Class II treatment group, with almost half of the group improving by >/=2.0 mm. The end-to-end treatment group had a positive change of 1.4 mm, compared with a control value of 0.6 mm, and the Class I group of about 1 mm compared with controls, who remained unchanged (0.1 mm). Skeletal changes were not significant when any of the groups were compared with controls. Conclusion: The expansion protocol had a significantly favorable effect on the sagittal occlusal relationships of Class II, end-to-end, and Class I patients treated in the early mixed dentition.
James A McNamara; Lauren M Sigler; Lorenzo Franchi; Susan S Guest; Tiziano Baccetti
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Angle orthodontist     Volume:  80     ISSN:  0003-3219     ISO Abbreviation:  Angle Orthod     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2009-11-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370550     Medline TA:  Angle Orthod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  230-8     Citation Subset:  D; IM    
a Thomas M. and Doris Graber Endowed Professor of Dentistry, Department of Orthodontics and Pediatric Dentistry, School of Dentistry; Professor of Cell and Developmental Biology, School of Medicine; and Research Professor, Center for Human Growth and Development, The University of Michigan, Ann Arbor, Mich. Private practice of orthodontics, Ann Arbor, Michigan.
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