Journal Article

An alternative to study model storage

O. H. Malik, M. Abdi-Oskouei and N. A. Mandall

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 31, issue 2, pages 156-159
Published in print April 2009 | ISSN: 0141-5387
Published online November 2008 | e-ISSN: 1460-2210 | DOI:
An alternative to study model storage

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The aim of this investigation was to evaluate whether the same orthodontic information can be obtained from study models and photographs of study models for the purposes of medico-legal reporting. Thirty sets of study models were obtained from orthodontic patients treated at the University of Manchester, UK. A mix of start and finish study models were chosen, with the start study models showing a range of malocclusions. Photographs of the study models were taken: anterior and right and left buccal views in occlusion and upper and lower occlusal views. Three examiners assessed the study models and photographs of the models in a random order. They recorded diagnostic information that would be useful for medico-legal reporting. This information was then compared for study models versus photographs of study models using intraclass correlation coefficients (ICCs) for interval data [overjet (mm), midline discrepancy (mm), and number of missing teeth] and kappa (k) and percentage agreement for the remaining variables.

Generally, agreement between the information obtained from study models versus photographs of study models was high with k values being above 0.70 for most variables. The exception to this was overbite with k values ranging from 0.66 to 0.74. When ICCs were considered, again the two methods compared very favourably.

Journal Article.  1589 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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