Influence of background on natural tooth colour coordinates: an in vivo evaluation

Abstract

The aim of this study was to evaluate the influence of different backgrounds on spectrophotometric colour values of natural teeth. Twenty volunteers (10 males and 10 females) with a mean age of 25 years and 9 months (±3 years and 2 months) were each subjected to 4 spectrophotometric measurements of their upper right central incisor. Each sample was measured with alternatively black, 50 % grey, white or no background (positive control). DE medians ranged from 0.9 to 5.9. All artificial backgrounds presented significant differences (p \ 0.05) when compared to values obtained without any background. No significant differences were observed between black and 50 % grey background (p [ 0.05). If an artificial background needs to be used, as for example when performing in vitro studies, preference should be given to a black background as it approaches best the clinical situation (i.e. no background). Even if no statistically significant differences were found when compared with the grey background, the black background should be preferred due to its lower DE medians, standard deviation as well as lower minimum and maximum values.

Color stability of recent composite resins

“…The use of a spectrophotometer was made to avoid all bias due to human eye evaluation, in accordance with precedent studies [6,[46][47][48] and to allow a double evaluation over a white as well as a black background. This double evaluation can simulate two different clinical situations [48]; the black background mimics class IV composite restorations, where no tooth structure exists in the back.…”

“…This double evaluation can simulate two different clinical situations [48]; the black background mimics class IV composite restorations, where no tooth structure exists in the back. White background can mimic the situation, where one of the walls is still present, i.e., class I, II, II, III and veneers.…”

Stain susceptibility of composite and ceramic CAD/CAM blocks versus direct resin composites with different resinous matrices

“…Odontology recent study, Ardu and coworkers concluded that black background could be considered as the ideal background for anterior teeth compared to grey and white ones [35]. Therefore, white and black backgrounds were selected to allow a better simulation of the clinical condition, in which the black background intended to simulate the light reflectance in restorations that are not surrounded by cavity walls, i.e.…”

“…This indicated that color discrepancies might be more evident in situations in which restorations are surrounded by tooth walls [26]. These results could be explained by the difference in contrast ratio between the stained samples/background and the level of light reflectance [26,35]. Based on the testing condition applied in this in vitro study, our results showed that except for distilled water and artificial saliva, none of the materials tested had DE values below 3.3 in all other solutions.…”

Staining susceptibility of recently developed resin composite materials

“…The choice of 28 days of immersion in the staining solutions was done in order to be consistent with the most recent literature reviews [45,46] representing around 2.5 years of clinical service. The spectrophotometric measurements with a black and a white background were done in order to simulate different clinical conditions such as class IV restorations and class III with no tooth substance is remaining (black background), or class I,II,III with some remaining tooth substance and veneers (white background) [52].…”