Translucency and color change of tooth-colored temporary coating materials
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Published on: June 6, 2025
Shoji Takenaka1, Rika Wakamatsu, Yumiko Ozoe
1Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences, 2-5274, Gakko-cho-dori, Chuo-ku, Niigata 951-8514, Japan. takenaka@dent.niigata-u.ac.jp
Purpose:
To estimate the color-masking ability of two polymer-based paint-on temporary coating materials, White Coat and BeautiCoat.
Methods:
Three shades (OA1, OB0, OB1) of White Coat and four shades (BW1, BW2, BW3 and BW4) of BeautiCoat were used. Disk specimens (0.25-2.0 mm thick) were prepared, CIELAB coordinates (L*, a*, b*) were measured against white and black backgrounds on a colorimeter, and translucency parameter (TP) was calculated. Masking effect (deltaME*ab) was also calculated as the color difference between a specimen over a black background and black background itself. Measurements were also made on a dentin-shaded resin composite as a substitute for discolored teeth, and color differences (deltaE*) were then calculated.
Results:
The TP value decreased as the thickness of the specimen increased, and non-linear regressions were shown between the specimen thickness and TP value for all materials evaluated (P < 0.01). TP values of BeautiCoat showed significant differences (P < 0.05) between each shade at any thickness evaluated, ranging from 20.0 to 46.4 at 0.25 mm in thickness. White Coat showed narrower-ranging TP values: from 20.0 to 23.5 at 0.25 mm, and differences were often insignificant. deltaME*ab values correlated with TP values. deltaE* values of 0.25 mm-thick specimens against the dentin-shade composite were above 6.5, which can be evaluated as visually perceptible.
