Journal Article

Colour and translucency of tooth-coloured orthodontic brackets

Yong-Keun Lee

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 30, issue 2, pages 205-210
Published in print April 2008 | ISSN: 0141-5387
Published online February 2008 | e-ISSN: 1460-2210 | DOI:
Colour and translucency of tooth-coloured orthodontic brackets

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The objective of this study was to determine the reflected and transmitted colours and the diffuse light transmittance of tooth-coloured brackets. Four ceramic and four plastic brands were evaluated and five brackets of each brand were tested. Reflected colour and spectral reflectance of the labial surface of the brackets were measured according to the Commission Internationale de l’Eclairage (CIE) colour scale and transmitted colour and diffuse spectral transmittance measured with a spectrophotometer. One-way analyses of variance were performed for the reflected and transmitted colour co-ordinates (CIE L*, a*, and b*) and for light transmittance according to bracket brand.

The range for CIE L* (lightness) was 36.2–50.3, for a* (red–green parameter) −1.3–3.8 and for b* (yellow–blue parameter) −2.9–11.2. All these colour co-ordinates were influenced by bracket brand (P < 0.05). Diffuse light transmittance was also influenced by bracket brand and ranged from 44.9 to 75.9 per cent (P < 0.05).

Colour and transmittance varied by bracket brand. Variations in optical properties influenced the aesthetic performance of the brackets and the degree of cure of the adhesive that is possible through the brackets. Further studies on the clinical implications of colour matching of tooth-coloured brackets with teeth should now be performed.

Journal Article.  3271 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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