Document Detail

Spontaneous mandibular arch response after rapid palatal expansion: a long-term study on Class I malocclusion.
MedLine Citation:
PMID:  15520690     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to investigate the spontaneous mandibular arch response to rapid palatal expansion as the sole orthodontic intervention. Particular attention was paid to clinically significant effects and long-term (mean age, 11.3 years) posttreatment stability in 30 Class I malocclusion patients treated during the early and mid mixed dentition. Measurements were made directly on 120 dental casts obtained at 4 assessment stages: pre-expansion (A1), short-term follow-up (A2), progress (A3), and long-term follow up (A4). Comparisons between A1 and A2 showed statistically significant (P < .001) increases for intermolar widths (lingual and occlusal values). During the transition to the permanent dentition, a significant (P < .001) decrease occurred in arch length and arch perimeter. There was a 25% intermolar width (occlusal value) decrease from the initial net gain, whereas the lingual values remained unchanged. Comparisons between A2 and A4 showed an intermolar width (occlusal value) net gain of 50% and a significant (P < .001) decrease for the arch length and arch perimeter. There was remarkable stability in intermolar width (lingual value) and intercanine width (occlusal value), indicating that the increase in the mandibular arch width dimension was in response to the orthopedic effects of rapid palatal expansion in the early and mid-mixed dentition and that the stability was maintained until adulthood.
Anna Carolina Lima; Anna Letícia Lima; Roberto M A Lima Filho; Ordean J Oyen
Publication Detail:
Type:  Comparative Study; Journal Article    
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:  126     ISSN:  0889-5406     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-11-02     Completed Date:  2004-12-10     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:  576-82     Citation Subset:  D; IM    
São José do Rio Preto, São Paulo, Brazil.
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MeSH Terms
Cuspid / pathology
Dental Arch / pathology*
Dental Models
Dentition, Mixed
Follow-Up Studies
Longitudinal Studies
Malocclusion, Angle Class I / pathology,  therapy*
Mandible / pathology*
Matched-Pair Analysis
Molar / pathology
Palatal Expansion Technique*

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

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