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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, M, Julian, R ORCID: 0000-0003-0634-2055, Williams, AM ORCID: 0000-0002-1545-174X, Tennant, M, Forrest, A, Walsh, LJ, Wilson, G and Blizzard, L ORCID: 0000-0002-9541-6943 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, vol. 278 , pp. 198-204 , doi: 10.1016/j.forsciint.2017.07.009.

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Abstract

Aim: Intra-oral 3D scanning of dentitions has the potential to provide a fast, accurate and non-invasivemethod of recording dental information. The aim of this study was to assess the reliability ofmeasurements of human dental casts made using a portable intra-oral 3D scanner appropriate forfielduse.Method: Two examiners each measured 84 tooth and 26 arch features of 50 sets of upper and lowerhuman dental casts using digital hand-held callipers, and secondly using the measuring tool providedwith the Zfx IntraScan intraoral 3D scanner applied to the virtual dental casts. The measurements wererepeated at least one week later. Reliability and validity were quantified concurrently by calculation ofintra-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-oral3D scanner were virtually indistinguishable from measurements of the same features made usingconventional hand-held callipers. The difference of means as a percentage of the average of themeasurements by each method ranged between 0.030% and 1.134%. The intermethod SEMs rangedbetween 0.037% and 0.535%, and the inter-method ICCs ranged between 0.904 and 0.999, for both theupper and the lower arches. The inter-rater SEMs were one-half and the intra-method/rater SEMs wereone-third of the inter-method values.Conclusion: This study demonstrates that the Zfx IntraScan intra-oral 3D scanner with its virtual onscreenmeasuring tool is a reliable and valid method for measuring the key features of dental casts.

Item Type: Article
Authors/Creators:Rajshekar, M and Julian, R and Williams, AM and Tennant, M and Forrest, A and Walsh, LJ and Wilson, G and Blizzard, L
Keywords: 3D imaging, Reliability validity, bite-marks, bite-mark analysis, forensic odontology, digital impressions
Journal or Publication Title: Forensic Science International
Publisher: Elsevier Sci Ireland Ltd
ISSN: 0379-0738
DOI / ID Number: 10.1016/j.forsciint.2017.07.009
Copyright Information:

Copyright 2017 Elsevier B.V.

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