The reliability and validity of measurements of human dental casts made by an intra-oral 3D scanner, with conventional hand-held digital callipers as the comparison measure

Rajshekar, Mithun, Julian, Roberta, Williams, Anne-Marie, Tennant, Marc, Forrest, Alex, Walsh, Laurence J., Wilson, Gary and Blizzard, Leigh (2017) The reliability and validity of measurements of human dental casts made by an intra-oral 3D scanner, with conventional hand-held digital callipers as the comparison measure. Forensic Science International, 278 198-204. doi:10.1016/j.forsciint.2017.07.009


Author Rajshekar, Mithun
Julian, Roberta
Williams, Anne-Marie
Tennant, Marc
Forrest, Alex
Walsh, Laurence J.
Wilson, Gary
Blizzard, Leigh
Title The reliability and validity of measurements of human dental casts made by an intra-oral 3D scanner, with conventional hand-held digital callipers as the comparison measure
Journal name Forensic Science International   Check publisher's open access policy
ISSN 1872-6283
0379-0738
Publication date 2017-09-01
Sub-type Article (original research)
DOI 10.1016/j.forsciint.2017.07.009
Open Access Status Not yet assessed
Volume 278
Start page 198
End page 204
Total pages 7
Place of publication E Park, Shannon, Clare Ireland
Publisher Elsevier Ireland
Language eng
Subject 2734 Pathology and Forensic Medicine
Abstract Aim Intra-oral 3D scanning of dentitions has the potential to provide a fast, accurate and non-invasive method of recording dental information. The aim of this study was to assess the reliability of measurements of human dental casts made using a portable intra-oral 3D scanner appropriate for field use. Method Two examiners each measured 84 tooth and 26 arch features of 50 sets of upper and lower human dental casts using digital hand-held callipers, and secondly using the measuring tool provided with the Zfx IntraScan intraoral 3D scanner applied to the virtual dental casts. The measurements were repeated at least one week later. Reliability and validity were quantified concurrently by calculation of intra-class correlation coefficients (ICC) and standard errors of measurement (SEM). Results The measurements of the 110 landmark features of human dental casts made using the intra-oral 3D scanner were virtually indistinguishable from measurements of the same features made using conventional hand-held callipers. The difference of means as a percentage of the average of the measurements by each method ranged between 0.030% and 1.134%. The intermethod SEMs ranged between 0.037% and 0.535%, and the inter-method ICCs ranged between 0.904 and 0.999, for both the upper and the lower arches. The inter-rater SEMs were one-half and the intra-method/rater SEMs were one-third of the inter-method values. Conclusion This study demonstrates that the Zfx IntraScan intra-oral 3D scanner with its virtual on-screen measuring tool is a reliable and valid method for measuring the key features of dental casts.
Keyword 3D imaging
Bite-mark analysis
Bite-marks
Digital impressions
Forensic odontology
Reliability validity
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
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