Document Detail

Failure rates and survival analysis of maxillary expansion appliances: a 24-year retrospective analysis.
MedLine Citation:
PMID:  19186771     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The purpose of this study was to describe the failure rates of maxillary expansion appliances (MEAs) and assess risk variables associated with failures and treatment time. METHODS: Retrospective chart reviews were performed on 436 primary or mixed dentition patients presenting with crossbite to a private practice between 1981-2005. Survival analysis was used to analyze and compare the types of MEAs with respect to the treatment time. The effect of demographic and clinical characteristics on appliance failure and treatment time was assessed using linear and logistic regression models. RESULTS: The average age at insertion of a MEA was 8 years, 4 months (+/-1.72 SD). Nineteen percent (n=84) of the MEAs failed, with a median treatment time for all appliances of 216 days (interquartile range=126 days). Cement loss (69%) was the most common type of failure. The likelihood of an appliance failing increased in children with a malocclusion other than Class I (adjusted odds ratio=1.91; 95% CI=1.16-3.14) and was nearly 4 times greater when a quad helix was used compare to the Haas appliance (adjusted odds ratio=3.60; 95% CI=1.92-6.75). The treatment time was significantly affected by the type of crossbite present and the occurrence of an appliance failure (P=.001). CONCLUSIONS: The use of a quad helix appliance and the presence of malocclusion other than Class I was significantly predictive of appliance failure. Treatment time was increased when MEAs failed and bilateral crossbite was present.
David A Beebe; Rocio B Quinonez; Elizabeth A Shick; Se Hee Kim; David B Kennedy
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Pediatric dentistry     Volume:  30     ISSN:  0164-1263     ISO Abbreviation:  Pediatr Dent     Publication Date:    2008 Nov-Dec
Date Detail:
Created Date:  2009-02-03     Completed Date:  2009-04-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7909102     Medline TA:  Pediatr Dent     Country:  United States    
Other Details:
Languages:  eng     Pagination:  469-74     Citation Subset:  D; IM    
University of Maryland, Baltimore, Md, USA.
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MeSH Terms
Logistic Models
Malocclusion / classification,  therapy*
Orthodontic Appliance Design*
Orthodontic Appliances / classification*
Palatal Expansion Technique / instrumentation*
Retrospective Studies
Survival Analysis
Treatment Failure

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

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