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Wavelength-Dependent Transmitted Irradiance Through Lithium Disilicate Ceramics.

Renata Nakagawa Lencioni1, Lauren G Lamoutte1, Patricia Pereira1

  • 1Department of Restorative Dental Sciences, College of Dentistry, University of Florida, Gainesville, Florida, USA.

Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [Et Al.]
|April 27, 2026
PubMed
Summary

Red light effectively penetrates lithium disilicate ceramic more than blue light, offering potential for improved dental resin cement curing. This finding supports the development of new photoinitiator systems using longer wavelengths.

Keywords:
CAD/CAM ceramicslithium disilicatephotobiomodulationphotoinitiatorspostoperative sensitivitytransmitted irradiancewavelength

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Area of Science:

  • Dental Materials Science
  • Photopolymerization
  • Biomaterials Engineering

Background:

  • Conventional camphorquinone-based resin cements have limitations with light penetration.
  • Novel photoinitiator systems utilizing longer wavelengths are under development.
  • Understanding light transmission through dental ceramics is crucial for effective photopolymerization.

Purpose of the Study:

  • To evaluate the transmitted irradiance of blue and red light through lithium disilicate ceramics.
  • To determine if longer wavelengths provide enhanced light delivery compared to shorter wavelengths.
  • To assess the influence of ceramic translucency, shade, and thickness on light transmission.

Main Methods:

  • Lithium disilicate blocks (IPS e.max CAD) with varying translucencies (HT, MT, LT) and shades (A1, A2, A3) were used.
  • Ceramic samples were sectioned to thicknesses ranging from 0.5 to 3.0 mm.
  • Transmitted irradiance of standardized blue and red LEDs was measured using a spectrometer system.

Main Results:

  • Ceramic thickness, light source, translucency, and shade all significantly influenced transmitted irradiance (p < 0.001).
  • Ceramic thickness had the greatest impact on irradiance, followed by the light source.
  • Red light demonstrated significantly higher transmitted irradiance than blue light across all tested conditions.

Conclusions:

  • Wavelength significantly affects transmitted irradiance through lithium disilicate ceramics.
  • Red light penetrates lithium disilicate ceramics more effectively than blue light.
  • These findings support the use of longer wavelengths for improved light delivery in dental applications.