Dental Materials
Volume 23, Issue 11 , Pages 1390-1396, November 2007

Laser-induced fluorescence to discriminate between a dental composite resin and tooth

  • St. Rüttermann

      Affiliations

    • Centre of Dentistry, Heinrich-Heine-University, Düsseldorf, Germany
    • ,
  • J. Ritter

      Affiliations

    • Centre of Dentistry, Heinrich-Heine-University, Düsseldorf, Germany
    • ,
  • W.H.-M. Raab

      Affiliations

    • Centre of Dentistry, Heinrich-Heine-University, Düsseldorf, Germany
    • ,
  • R. Bayer

      Affiliations

    • Institute of Laser Medicine, Heinrich-Heine-University, Düsseldorf, Germany
    • ,
  • R. Janda

      Affiliations

    • Centre of Dentistry, Heinrich-Heine-University, Düsseldorf, Germany
    • Corresponding Author InformationCorresponding author at: Heinrich-Heine-University, Medical Faculty, Centre of Dentistry, Department of Operative and Preventive Dentistry and Endodontics, Moorenstr. 5, Geb. 18.13, D-40225 Düsseldorf, Germany. Tel.: +49 6123 706 818; fax: +49 6128 48 96 99.

Received 18 February 2006; received in revised form 21 November 2006; accepted 21 November 2006.

Abstract 

Purpose

Investigation of laser-induced fluorescence of an experimental pigment (Flu) to discriminate between a filling and the tooth and its influence on the material properties of experimental dental composites.

Materials and methods

Three experimental composites (EC) were manufactured. The standard contained no Flu, Flu-0.5 contained 0.5%, Flu-1.0 contained 1%. To judge the extent of fluorescence, specimens and fillings placed in natural teeth were irradiated with an infrared laser (980nm, 120mW). Flexural strength, modulus of elasticity, depth of cure, water sorption, solubility, and color (CIE-L*a*b*-values) were measured to investigate the influence of Flu on EC. ANOVA was calculated and the statistical significance was p<0.05.

Results

Strong laser-induced green fluorescence was observed so that fillings and tooth structures were clearly discriminated. No influence of Flu on flexural strength and modulus of elasticity occurred. Water sorption and solubility were far below the limits of EN ISO 4049. Increasing Flu concentrations revealed minor but significant reduction of depth of cure, shifts to more white and red and less yellow.

Significance

Flu provides laser-induced fluorescence allowing an easy discrimination between fillings and teeth. Flu did not severely influence the material properties.

Keywords: Fluorescence, Dental composite, Strength, Dental filling, Water sorption and solubility

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PII: S0109-5641(06)00316-2

doi:10.1016/j.dental.2006.11.027

Dental Materials
Volume 23, Issue 11 , Pages 1390-1396, November 2007

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