Comparison of colour differences in visual versus spectrophotometric shade matching

Introduction: The challenge of achieving accurate colour matching in restorative dentistry is central to success in aesthetics. For many years selection of tooth colour in both restorative and prosthodontic dentistry have relied on shade guides which present a number of tabs of differing hue. Signal difficulties do arise with their use, notably in terms of accuracy and variability under differing circumstances. The use of a digital device to evaluate and record tooth colour offers an advanced option. Aim: There is merit in assessing the extent of agreement between the digital and the human assessment methods. Method: Twenty five patients were selected who had all upper anterior teeth, with the right central being pristine. Colour assessments were undertaken using a variety of guides and devices. The measurements were recorded and subjected to statistical comparisons. Results: In general there were significant differences recorded between the systems but it appears that these results may not be of clinical import. Conclusions: The advice to practitioners is that it would be best practice to use both human assessment and digital evaluation to ensure that acceptable aesthetics are achieved.