Document Detail

The effects of maxillary protraction therapy with or without rapid palatal expansion: a prospective, randomized clinical trial.
MedLine Citation:
PMID:  16168327     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: The purpose of this controlled randomized clinical trial was to quantify the effects of maxillary protraction with or without palatal expansion. METHODS: Forty-six children aged 5 to 10 years were randomly assigned to 1 of 3 groups: (1) facemask with palatal expansion, (2) facemask without palatal expansion, and (3) observation for 12 months. Cephalometric analysis with traditional cephalometric measurements, an x-y coordinate system, and an occlusal-plane analysis were used. RESULTS: Student t tests showed no significant differences (P < .05) between expansion and nonexpansion groups in any measured variable. Comparisons of treated and control subjects showed significant (P < .01) treatment effects beyond normal Class III growth. Analysis of x-y coordinate variables showed the following: 2 mm additional forward displacement of the maxillary complex with counterclockwise rotation, mandibular clockwise rotation, posterior movement of B-point by an average of 1.5 mm, and forward movement of the maxillary dentition of nearly 1 mm. Analysis of traditional cephalometric measures showed improvements in ANB angle of nearly 4 degrees and Wits appraisal of nearly 4 mm. The occlusal plane analysis showed an apical base change of 4 mm, 1.5 mm forward displacement of the maxillary complex, mandibular clockwise rotation of 2.5 mm, and forward maxillary molar movement of 1.9 mm. CONCLUSIONS: The results of this continuing 5-year clinical trial indicate that early facemask therapy, with or without palatal expansion, is effective to correct skeletal Class III malocclusions.
Gregory A Vaughn; Brian Mason; Hong-Beom Moon; Patrick K Turley
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics     Volume:  128     ISSN:  0889-5406     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-09-19     Completed Date:  2005-10-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  299-309     Citation Subset:  D; IM    
Department of Orthodontics, School of Dentistry, University of Washington, Seattle, USA.
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MeSH Terms
Child, Preschool
Extraoral Traction Appliances*
Malocclusion, Angle Class III / therapy*
Maxilla / pathology
Palatal Expansion Technique*
Prospective Studies
Single-Blind Method
Skull Base
Comment In:
Evid Based Dent. 2006;7(1):16-7   [PMID:  16557252 ]

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

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