Journal Article

Space analysis: a comparison between sonic digitization (DigiGraph™ Workstation) and the digital caliper

KHY Mok and MS Cooke

in The European Journal of Orthodontics

Published on behalf of European Orthodontic Society

Volume 20, issue 6, pages 653-661
Published in print December 1998 | ISSN: 0141-5387
Published online December 1998 | e-ISSN: 1460-2210 | DOI:
Space analysis: a comparison between sonic digitization (DigiGraph™ Workstation) and the digital caliper

More Like This

Show all results sharing this subject:

  • Restorative Dentistry and Orthodontics


Show Summary Details


The introduction of the DigiGraph™ Workstation permits the use of sonic digitization to measure lateral cephalometric values, mesiodistal tooth size and arch perimeter discrepancy as a one-stop diagnostic record taking set-up. This study compared the reproducibility of mesiodistal total tooth widths and arch perimeter values, on plaster casts, given by the DigiGraph™ Workstation and by digital calipers. Forty-seven sets of plaster casts of Southern Chinese children (mean age of 12.5 years) comprised the sample. Arch perimeter was measured using calipers in six segments from the distal of the first permanent molar to its antimere in each arch. The total mesiodistal widths of all teeth, excluding second and third molars, were also measured. The difference between the available arch perimeter and the total tooth widths was taken as the arch perimeter discrepancy. Sonic digitization of the study casts was completed according to instructions of the DigiGraph™ software. Paired t-tests and F-tests were used to compare the two methods.

Compared with manual measurement, there was an over-estimation of the total tooth widths by 1 mm in the mandible and 0.5 mm in the maxilla, and an arch perimeter discrepancy of 1.6 mm in the mandible and 0.4 mm in the maxilla when using the sonic method. The sonic digitization was not as reproducible as the digital caliper and its clinical usefulness in evaluating the space problem of an individual malocclusion should be interpreted with caution.

Journal Article.  0 words. 

Subjects: Restorative Dentistry and Orthodontics

Full text: subscription required

How to subscribe Recommend to my Librarian

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content.