Document Detail

Activation time and material stiffness of sequential removable orthodontic appliances. Part 1: Ability to complete treatment.
MedLine Citation:
PMID:  14614415     Owner:  NLM     Status:  MEDLINE    
Recent advances in technology have led to the availability of sequential removable orthodontic appliances (aligners) to move teeth in a stepwise fashion (Invisalign, Align Technology, Santa Clara, Calif). This study was undertaken to compare 2 distinctly different materials (hard and soft) and 2 activation frequencies (1 week and 2 weeks) for this technique. Fifty-one subjects, stratified by peer assessment rating (PAR) and need for extractions, were randomly assigned to a hard or a soft plastic appliance, and a 1-week or 2-week activation time. The primary endpoint was the completion of the initially prescribed series of aligners. Changing aligners every other week was more likely to lead to completion of the initial series of aligners than changing aligners weekly (37% vs 21%). No substantial difference in the completion rate was observed for the soft versus the hard appliance (27% vs. 32%). The completion rate was highest (46%) among patients with PAR scores less than 15 and no planned extractions, and lowest (0%) among subjects who had 2 or more premolars extracted. All who completed their initial series of aligners required an additional series of aligners or fixed appliances to achieve the original treatment goals. This exploratory study suggests that subjects with a 2-week activation regimen, no extractions, and a low PAR score are more likely to complete their initial series of aligners.
Anne-Marie Bollen; Greg Huang; Greg King; Philippe Hujoel; Tsun Ma
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
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:  124     ISSN:  0889-5406     ISO Abbreviation:  Am J Orthod Dentofacial Orthop     Publication Date:  2003 Nov 
Date Detail:
Created Date:  2003-11-17     Completed Date:  2003-12-04     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  8610224     Medline TA:  Am J Orthod Dentofacial Orthop     Country:  United States    
Other Details:
Languages:  eng     Pagination:  496-501     Citation Subset:  D; IM    
Department of Orthodontics, School of Dentistry, University of Washington, Box 357446, Seattle, WA 98195, USA.
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MeSH Terms
Activator Appliances*
Chi-Square Distribution
Malocclusion / therapy*
Middle Aged
Odds Ratio
Orthodontic Appliance Design
Orthodontics, Corrective / instrumentation*,  methods*
Patient Acceptance of Health Care
Peer Review, Health Care
Survival Analysis
Time Factors
Tooth Extraction
Grant Support
Reg. No./Substance:
Comment In:
Am J Orthod Dentofacial Orthop. 2004 Mar;125(3):19A   [PMID:  15025081 ]

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

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