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Article: Volume 6 Number 4 Page 112 - October 2013

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  Orth Update 2013; 6: 112-120

Orthodontics:  Index of Orthodontic Treatment Need Applied to Plaster Models and to their Three-Dimensional Digital Equivalents

CPD:  CPD  1:20   (closed)      Self assess

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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 threedimensional 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.

Author notes: Paul R Sharma, BDS, MFDS, MClinDent, MOrth, RCS(Ed), Post-CCST in Orthodontics, Department of Orthodontics, King’s College Hospital, Denmark Hill, London, SE5 9RS, Niall JP McGuinness, PhD(QUB), DDS(U.Edin), MScD(U.Wales), BDS, BA(U.Dubl), FDS(Orth) RCPS(Glasg), MOrth RCS(Edin), Consultant and Honorary Senior Lecturer, Department of Orthodontics, Edinburgh Dental Institute, Lauriston Place, Edinburgh, EH3 9HA and 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.

Objective: To demonstrate how the IOTN can be applied to 3-D digital casts and orthodontics.

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