Comparison of in vivo visual and computeraided to

Authors: Burkard Hugo Tobias Witzel Bernd Klaiber

Publish Date: 2005/10/08

Volume: 9, Issue: 4, Pages: 244-250

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Abstract

The aim of this study was to evaluate the performance of shadedetermining devices For the daily practitioner it is essential to know whether modern computeraided shade selection is reliable in everyday life So the question of how the clinical usability of these machines could be rated has to be clarified In the following three actual devices available in the market were compared using a human observers perception The SpectroShade device MHT Optic Research AG 8155 Niederhasli Switzerland the ShadeVision device XRite Co Grandville USA and the Digital Shade Guide DSG4 A Rieth 73614 Schorndorf Germany were assessed with respect to their agreement with the color perception of three examiners looking at 57 test persons six teeth each for a total of 342 Shades were reported in Vita Classical shades It could be demonstrated that every single human examiner showed a significantly higher agreement value human group on average 402 when compared with the remaining five methods than each computeraided tooth shade determination device The devices reached on average only a value of 286 whereas the XRite ShadeVision showed a significant better result 332 than the MHT SpectroShade and Rieth DSG4 270 and 257 Identical shade results given by all three methods of a group group of three devices and three humans were found to be rather low for the computeraided devices 99 compared with humans 367 All six methods together agreed in 33 of the cases It becomes evident that the methods—especially the computeraided shade determination—are rather divided about the respective tooth color Deficiencies of the instrumental as well as the visual detection become obvious The best agreement level was performed by the human examiners The best agreement of the evaluated devices was obtained—generally as well as among the human testers—by the XRite ShadeVision system followed at a statistically significant distance by the MHT SpectroShade and the Rieth DSG4 The agreement among the examiner group was 529 significantly better than that of each device compared to this group 313 on average Color detection and its realization are very complex As shown in many cases computeraided color shade determination of natural teeth seems to not reflect human perception

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