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Biomedical Engineering / Biomedizinische Technik

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Volume 57 (2012)

Analysis of colour stability of selected provisional prosthetic materials: an in vitro study

Ryszard Koczorowski1 / Kamila Linkowska-Świdzińska1 / Tomasz Gedrange2 / Teodor Świdziński3

1Departament of Prosthodontics, University of Medical Sciences, Poznań, Poland

2Department of Orthodontics, Preventive and Paediatric Dentistry, Centre of Dentistry and Oral Health, Ernst Moritz Arndt University, Greifswald, Germany

3Department of Biophysics, University of Medical Sciences, Poznań, Poland

Corresponding author: Prof. Dr. Tomasz Gedrange, Department of Orthodontics, Rotgerberstr. 8, 17489 Greifswald, Germany Phone: +49-3834-867110 Fax: +49-3834-867113

Citation Information: Biomedizinische Technik/Biomedical Engineering. Volume 54, Issue 4, Pages 205–210, ISSN (Online) 1862-278X, ISSN (Print) 0013-5585, DOI: 10.1515/BMT.2009.019, July 2009

Publication History

Received:
2007-05-31
Accepted:
2009-03-06
Published Online:
2009-07-14

Abstract

Prosthetic restorative materials (that are) used for temporary fixed dentures tend to exhibit variable discolouration over several weeks of use. The aim of this study was to perform a spectrophotometric analysis of the influence of selected discolouring factors on the colour stability of provisional prosthetic materials in vitro. In the study, the following prosthetic materials for short-term use in the oral cavity were evaluated: Luxatemp, Structur 2S.C., Protemp II, Zhermacryl STC and Dentalon Plus. Samples of these materials were immersed in coffee, tea and dark fruit juice for 60 h at different pH values. Colour was evaluated by determining the monochromatic coefficients of light reflected by the samples, using a spectrophotometric method. Results received in artificial light (illuminant A) were compared with those obtained in daylight (illuminant D65). Changes in colour and its parameters according to the CIE L*a*b* system were analysed. The analysis (of the colour and colour parameters) of the tested materials in two types of light showed that Structur displayed the greatest tendency to discolouration and that the least tendency to discolouration was exhibited by Dentalon Plus. The fact that colour parameters obtained in two types of light were not identical suggests that changes in the colour of the same material may be perceived differently, depending on the illuminant. Provisional prosthetic materials show variable colour stability under different conditions in the oral cavity. The colour of prosthetic materials may be perceived differently, depending on the illuminant and the effect of the environment in which they are used.

Keywords: colour parameters; colour stability; prosthetic materials; provisional fixed dentures; spectrophotometry

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