Search our Database of Scientific Publications and Authors

I’m looking for a

    Details and Download Full Text PDF:
    Color and luminescence stability of selected dental materials in vitro.

    J Prosthodont 2012 Feb;21(2):112-22
    Department of Gerodontology, University of Medical Sciences, Poznań, Poland Faculty of Commodity Science, The Poznań University of Economics, Poznań, Poland.
    Purpose: To study luminescence, reflectance, and color stability of dental composites and ceramics.

    Materials And Methods: IPS e.max, IPS Classic, Gradia, and Sinfony materials were tested, both unpolished (as-cast) and polished specimens. Coffee, tea, red wine, and distilled water (control) were used as staining drinks. Disk-shaped specimens were soaked in the staining drinks for up to 5 days. Color was measured by a colorimeter. Fluorescence was recorded using a spectrofluorometer, in the front-face geometry. Time-resolved fluorescence spectra were recorded using a laser nanosecond spectrofluorometer.

    Results: The exposure of the examined dental materials to staining drinks caused changes in color of the composites and ceramics, with the polished specimens exhibiting significantly lower color changes as compared to unpolished specimens. Composites exhibited lower color stability as compared to ceramic materials. Water also caused perceptible color changes in most materials. The materials tested demonstrated significantly different initial luminescence intensities. Upon exposure to staining drinks, luminescence became weaker by up to 40%, dependent on the drink and the material. Time-resolved luminescence spectra exhibited some red shift of the emission band at longer times, with the lifetimes in the range of tens of nanoseconds.

    Conclusions: Unpolished specimens with a more developed surface have lower color stability. Specimens stored in water develop some changes in their visual appearance. The presently proposed methods are effective in evaluating the luminescence of dental materials. Luminescence needs to be tested in addition to color, as the two characteristics are uncorrelated. It is important to further improve the color and luminescence stability of dental materials.
    PDF Download - Full Text Link
    ( Please be advised that this article is hosted on an external website not affiliated with
    Source Status ListingPossible

    Similar Publications

    Luminescence of selected dental composites in vitro.
    Dent Mater 2008 Oct 10;24(10):1329-35. Epub 2008 Apr 10.
    Medical Faculty II, Poznań University of Medical Sciences, Bukowska 70, 60-812 Poznań, Poland.
    Objectives: The work was motivated by the necessity to evaluate the emission changes of dental composites, as the emission under UV light is one of the important optical parameters of the hard tooth tissue.

    Methods: Fulfill extra, Artemis and Durafill VS materials in A3.5 shade were tested. Read More
    Effects of different drinks on stainability of resin composite provisional restorative materials.
    J Prosthet Dent 2005 Aug;94(2):118-24
    Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey.
    Statement Of Problem: The ability of tooth-colored restorative materials for provisional restorations to resist stains is important when interim prostheses are worn for a long period. Discoloration of provisional restorative materials may result in patient dissatisfaction and additional time and expense for replacement. However, the effect of different staining agents on the color difference of resin composite restorative materials has not been completely clarified. Read More
    Effect of resin surface sealers on improvement of stain resistance for a composite provisional material.
    J Esthet Restor Dent 2003 ;15(4):244-9; discussion 249-50
    Department of Restorative Dentistry, University of Pennsylvania, School of Dental Medicine, Philadelphia, PA, USA.
    Background: Resistance to staining is desirable to maintain the esthetic appearance of a provisional material. A resin sealant may improve stain resistance.

    Purpose: Color changes of a resin composite provisional material were measured by reflection spectrophotometry after storage in three staining solutions and water to determine stain resistance when treated with three methacrylate or urethane dimethacrylate resin surface sealants and when left untreated. Read More
    Effects of various finishing procedures on the staining of provisional restorative materials.
    J Prosthet Dent 2005 May;93(5):453-8
    Faculty of Dentistry, Department of Prosthodontics, Ondokuzmayis University, Kurupelit-Samsun, Turkey.
    Statement Of Problem: The color stability of tooth-colored restorative materials for provisional restorations is of primary importance when provisional prostheses are worn long term. However, the effect of different polishing methods on the color difference of provisional restorative (PR) materials has not been completely clarified.

    Purpose: The purpose of this study was to investigate the effect of different polishing methods on color stability of 2- and 3-component autopolymerized bis-acrylic composites, a light polymerized composite, and a methyl methacrylate-based PR material upon exposure to a staining agent. Read More