J. Orthod.
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British Journal of Orthodontics, Vol 21, 1-13, Copyright © 1994 by British Orthodontic Society

ARTICLES

Predictors of relapse in orthodontically-treated Class III malocclusions

JM Battagel
Department of Child Dental Health, London Hospital Medical College Dental School.

This study aimed to investigate the possibility of predicting relapse from the pretreatment records of children with orthodontically treatable Class III malocclusions. Sixty-four patients were studied: 31 individuals had been treated by a non-extraction technique, the remaining 33 with mid-arch extractions. Cephalometric and model data taken at the start of treatment and at least 2 years after all treatment and retention had ceased were examined. An individual diagnosis of relapse or stability was made from the post-retention records and the start of treatment records analysed in relation to this information. The capacity for predicting the observed outcome of therapy was assessed in three ways: correlation coefficients, the number of cephalometric measurements exceeding two standard deviations from a control group mean, and discriminant analysis. Only the latter proved an effective indicator of relapse, with a separate discriminant model being necessary for each sub-group.




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Copyright © 1994 British Orthodontic Society.