Document Detail

Patterns and prediction of orthodontic treatment course.
MedLine Citation:
PMID:  9009429     Owner:  NLM     Status:  MEDLINE    
Most attempts at the identification and prediction of treatment-related changes and outcome in orthodontics thus far have relied upon single biometric parameters instead of employing a systemic and ecological approach. The concept of facial harmony and the availability of sophisticated multivariate statistics offer new chances for a deeper understanding of the mechanisms of change. A longitudinal study has been conducted on approximately 500 youths aged 9-11 years, on average. Numerous parameters of cephalometric analysis, study casts, growth, treatment regimen and patient co-operation were assessed at the onset of treatment (T0) and after 1 year (T1) to determine treatment-related changes under therapy with removable appliances. Exploratory cluster analyses were based on five fundamental cephalometric parameters (SNA, SNB, ML-NSL, NL-NSL, NS-Ba) that establish an operational approach to harmonious facial relations (Segner and Hasund, 1991). As a first step, analyses were restricted to 281 Class II division 1 patients selected for good co-operation by an expert rating by the first author on a three-point rating scale. They all were treated with bionators either with anterior or posterior traction. Both subgroups were studied separately. Based on cluster analytic procedures, different patterns of change were identified for both types of appliance. A slight tendency toward harmonization of the initial skeletal relations was observed throughout all subgroups, with reactions being most obvious in the maxilla. The clusters produced for either appliance group were then screened for additional predictors of group membership by means of discriminant analysis. The findings are discussed in terms of the suitability of the methodological approach chosen.
R Koch; A Bartsch
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of orthodontics     Volume:  18     ISSN:  0141-5387     ISO Abbreviation:  Eur J Orthod     Publication Date:  1996 Dec 
Date Detail:
Created Date:  1997-02-25     Completed Date:  1997-02-25     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  7909010     Medline TA:  Eur J Orthod     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  645-54     Citation Subset:  D; IM    
Department of Orthodontics and Dentofacial Orthopaedics, Dental School, University of Würzburg, Germany.
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MeSH Terms
Activator Appliances
Clinical Protocols
Cluster Analysis
Dental Models
Discriminant Analysis
Extraoral Traction Appliances
Face / anatomy & histology
Facial Bones / pathology
Follow-Up Studies
Longitudinal Studies
Malocclusion, Angle Class II / pathology,  therapy
Maxilla / pathology
Maxillofacial Development
Multivariate Analysis
Orthodontic Appliance Design
Orthodontics, Corrective* / statistics & numerical data
Patient Compliance
Treatment Outcome

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

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