Masticatory efficiency

Software to quickly and objectively measure the degree of mixing in a two-colour gum test.

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[huematch screenshot]

What it does

Viewgum measures the colour of the pixels of the gum and computes the circular standard deviation of the hue component (see Directional Statistics and Hue). The larger this is, the more un-mixed the two colours are.


Viewgum is freeware. No user support is provided, but do not hesitate to email for assistance. Any comments, bug reports or suggestions for improvements are welcome.

Important Notice

This software is for testing purposes only and should not be used for patient evaluation or diagnosis. The software may still contain significant bugs. No responsibility will be assumed for the use or misuse of this software.


Hue-check Gum® is a two-colour gum specially developed for evaluating masticatory efficiency. For more information please visit the Orophys GmbH website. dHAL Software does not have any financial interest or affiliation with Orophys or its products.
Update: Orophys has been liquidated and is no longer operational, but interested researchers can contact Prof. Martin Schimmel at the Department of Reconstructive Dentistry and Gerodontology, University of Bern.

Viewgum was first described in this paper:

Novel software for quantitative evaluation and graphical representation of masticatory efficiency. Halazonetis DJ, Schimmel M, Antonarakis GS, Christou P. J Oral Rehabil. 2013 May;40(5):329-35. doi: 10.1111/joor.12043. PMID: 23452188

Information about the two-colour chewing gum test and additional publications:

Comparison of smartphone-camera and conventional flatbed scanner images for analytical evaluation of chewing function. Fankhauser N, Kalberer N, Müller F, Leles CR, Schimmel M, Srinivasan M. J Oral Rehabil. 2020 Dec;47(12):1496-1502. doi: 10.1111/joor.13094. PMID: 32966643
Validation of a purpose-built chewing gum and smartphone application to evaluate chewing efficiency. Buser R, Ziltener V, Samietz S, Fontolliet M, Nef T, Schimmel M. J Oral Rehabil. 2018 Nov;45(11):845-853. doi: 10.1111/joor.12696. PMID: 30024031
Reliability of a two-colour chewing gum test to assess masticatory performance in complete denture wearers. Silva LC, Nogueira TE, Rios LF, Schimmel M, Leles CR. J Oral Rehabil. 2018 Apr;45(4):301-307. doi: 10.1111/joor.12609. PMID: 29356092
Two-colour chewing gum mixing ability test for evaluating masticatory performance in children with mixed dentition: validity and reliability study. Kaya MS, Güçlü B, Schimmel M, Akyüz S. J Oral Rehabil. 2017 Nov;44(11):827-834. doi: 10.1111/joor.12548. Epub 2017 Sep 7. PMID: 28741713
A novel colourimetric technique to assess chewing function using two-coloured specimens: Validation and application. Schimmel M, Christou P, Miyazaki H, Halazonetis D, Herrmann FR, Müller F. J Dent. 2015 Aug;43(8):955-64. doi: 10.1016/j.jdent.2015.06.003. PMID: 26111925