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LED and Halogen Light Transmission through a CAD/CAM Lithium Disilicate Glass-Ceramic.

Carolina Nemesio de Barros Pereira1, Cláudia Silami De Magalhães1, Bruno Daleprane1

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Summary
This summary is machine-generated.

Light transmission through CAD/CAM lithium disilicate ceramics is reduced by thickness and shade, with higher transmission for lighter shades and high-translucency materials. Light attenuation may impact resin cement polymerization.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Optical Physics

Background:

  • CAD/CAM lithium disilicate ceramics are widely used in dental restorations.
  • Light transmission through ceramic restorations is crucial for the efficacy of light-cured resin cements.
  • Understanding factors affecting light transmission is essential for optimizing clinical outcomes.

Purpose of the Study:

  • To evaluate the effect of ceramic thickness, shade, and translucency on light transmission.
  • To compare light transmission from light-emitting diode (LED) and quartz-tungsten-halogen (QTH) light sources.
  • To determine the impact of these factors on the potential for resin cement polymerization.

Main Methods:

  • IPS e.max CAD ceramics in shades A1-A3.5 with high (HT) and low (LT) translucency were prepared at thicknesses of 1-5 mm.
  • Emission spectra of LED and QTH light sources were analyzed.
  • Light intensity was measured before and after transmission through ceramic samples to calculate light transmission percentage (TP).
  • Linear regression analysis was employed to assess the relationships between variables.

Main Results:

  • Ceramic thickness showed a strong negative correlation with light transmission (R=-0.845), with each millimeter increase reducing TP by 3.17%.
  • Lighter shades (A1, A2) exhibited significantly higher light transmission than darker shades (A3, A3.5).
  • High-translucency (HT) ceramics and QTH light sources resulted in greater light transmission compared to low-translucency (LT) ceramics and LED sources.
  • A maximum TP of 25% (QTH) and 20% (LED) was observed.

Conclusions:

  • Ceramic thickness, shade, and translucency significantly influence light transmission.
  • Light transmission decreases with increasing ceramic thickness and darker shades.
  • QTH sources and HT ceramics offer better light transmission, potentially improving resin cement polymerization.
  • Observed light attenuation may compromise the effectiveness of light-cured and dual-cure resin cements.