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Light transmission through porcelain.

Rogéli T R C Peixoto1, Vanessa Maria F Paulinelli, Herbert H Sander

  • 1Department of Restorative Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil. rogelit@terra.com.br

Dental Materials : Official Publication of the Academy of Dental Materials
|January 9, 2007
PubMed
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Porcelain thickness significantly reduces light transmission, with thinner samples (1.5 mm) transmitting more light than thicker ones (4 mm). Shade also impacts light transmission, though thickness is the primary factor affecting dental ceramic light penetration.

Area of Science:

  • Dental Materials Science
  • Optical Properties of Ceramics
  • Light Transmission in Dental Restorations

Background:

  • Accurate light transmission through dental ceramics is crucial for effective light-curing of resin cements and composite materials.
  • Understanding how porcelain shade and thickness influence light penetration is essential for optimizing clinical outcomes in restorative dentistry.

Purpose of the Study:

  • To evaluate the impact of varying porcelain shades and thicknesses on light transmission.
  • To quantify the relationship between porcelain optical properties and light penetration using the Lambert-Beer law.

Main Methods:

  • 128 Duceram porcelain disks were fabricated with four thicknesses (1.5-4.0 mm) and eight shades.
  • Light transmission was measured using a digital power meter.

Related Experiment Videos

  • The Lambert-Beer law was applied to calculate porcelain transmission and absorption coefficients.

    • Main Results:

    • Light transmission decreased significantly with increased porcelain thickness.
    • Shades A(1) and D(2) at 1.5 mm thickness showed the highest transmission (8%); shades A(4), B(4), and C(4) at 4 mm thickness showed the lowest (0.5%).
    • The Lambert-Beer law accurately described the relationship between transmission, thickness, and shade, with statistically similar reflection coefficients across shades.

    Conclusions:

    • Increased porcelain thickness is the primary factor reducing light transmission.
    • Significant differences in light transmission exist between shades for a given thickness.
    • Thicker samples exhibited fewer statistically significant differences in transmission among shades.