Factors influencing the outcome and duration of removable appliance treatment

The study models and records of 150 consecutively completed removable appliance cases were analysed and the influence of various factors assessed on both the change in Peer Assessment Rating (PAR) score produced by treatment and the duration of treatment. For the purpose of analysis the material was...

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Bibliographic Details
Published in:European journal of orthodontics 1994-06, Vol.16 (3), p.181-186
Main Authors: John, W., Kerr, S., Buchanan, Iain B., McNair, Fergus I., McColl, John H.
Format: Article
Language:English
Subjects:
Adolescent
Age Factors
Analysis of Variance
Child
Dentistry
Extraoral Traction Appliances
Female
Health Services Needs and Demand
Humans
Male
Malocclusion - therapy
Orthodontic Appliances, Functional
Orthodontic Appliances, Removable
Peer Review, Health Care
Regression Analysis
Retrospective Studies
Sex Factors
Time Factors
Treatment Outcome
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Summary:The study models and records of 150 consecutively completed removable appliance cases were analysed and the influence of various factors assessed on both the change in Peer Assessment Rating (PAR) score produced by treatment and the duration of treatment. For the purpose of analysis the material was divided into two groups; a functional appliance/headgear group (n=43) and an upper removable appliance group (n=103). The initial PAR score accounted for 71 per cent of the variation in PAR change in the functional/headgear group when combined with the sex of the patient; females on average showing a further improvement of 3 PAR points over equivalent males. The initial PAR score alone accounted for 68 per cent of the variation in PAR change in the upper removable appliance group. Sixty per cent of the variability in treatment duration could be explained in the functional/headgear group by the initial PAR score and a binary variable indicating whether three or more appliances had been required. Fifty-six per cent of the variability in duration in the upper removable appliance group was explained by the number of appliances used alone. Regression equations for prediction of outcome and duration of removable appliance treatment are given.
ISSN:0141-5387
1460-2210
DOI:10.1093/ejo/16.3.181