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References

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Index of orthodontic treatment need applied to plaster models and to their three-dimensional digital equivalents

From Volume 6, Issue 4, October 2013 | Pages 112-120

Authors

Niall JP McGuinness

PhD, DDS, MScD, BDS, BA, FDS(Orth) RCPS(Glasg), DOrth, MOrth RCS(Edin)

Consultant Orthodontist/Hon Senior Lecturer, Edinburgh Dental Institute, Lauriston Place, Edinburgh EH3 9HA, UK

Articles by Niall JP McGuinness

James P McDonald

PhD, FDS RCS(Ed), FRCS(Ed)(Hon)

Professor, Consultant and Honorary Senior Lecturer, Department of Orthodontics, Hayfield Road, Kirkcaldy, Fife, KY2 5AH

Articles by James P McDonald

Abstract

Orthodontic plaster casts are fragile and bulky, and an alternative method of storage which allows accurate dental cast measurement is desirable. Four examiners determined the IOTN scores from 30 sets of plaster casts on two occasions and their three-dimensional digital equivalents on two occasions. Three-dimensional digital models were found to be suitable substitutes for plaster models when scoring the Dental Health Component of the IOTN. However, there was less agreement in the scores for the Aesthetic Component.

Clinical Relevance: The application of three-dimensional digital casts in orthodontics.

Article

Plaster study models (or casts) have been a mainstay of clinical records in dentistry for many years. The use of study models is an integral part of both dental practice and dental research. The accuracy of dental measurement using such casts is more than sufficient for clinical purposes,1 providing an ideal three-dimensional, time-related record of the original dental status and the results of treatment,2 and are relatively inexpensive to produce.

For medico-legal purposes in the United Kingdom the Consumer Protection Act3 states that it is necessary to retain all patient records for a minimum of ten years (Medical and Dental Defence Union of Scotland4) and the British Orthodontic Society5 recommends that study models should be kept for 11 years, or until the patient is 25 years old, whichever is the later. This leads to problems of storage in terms of space and cost, in addition to the risk of damage because of the brittle nature of dental casts,6 highlighting the need for an alternative method of storage.

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