Wavelength‐Dependent Transmitted Irradiance Through Lithium Disilicate Ceramics
Year: 2026
Type: article
Abstract: ABSTRACT Objective Novel photoinitiator systems responsive to longer wavelengths are being developed to overcome limitations of conventional camphorquinone‐based resin cements. This study evaluated transmitted irradiance of short‐wavelength (blue) and long‐wavelength (red) light through lithium disilicate ceramics of varying translucencies, shades, and thicknesses to determine whether longer wavelengths provide enhanced light delivery under standardized conditions Materials and Methods Lithium disilicate CAD / CAM blocks ( IPS e.max CAD , Ivoclar Vivadent) with three translucency levels ( HT , MT , LT ) and three shades ( A1 , A2 , A3 ) were sectioned into six thicknesses (0.5–3.0 mm) and crystallized ( n = 3). Precalibrated experimental LEDs emitting blue or red wavelengths were standardized to 1000 mW /cm 2 . Transmitted irradiance ( mW /cm 2 ) was measured using a calibrated spectrometer system with integrating‐sphere collection ( MARC Light Collector, BlueLight Analytics). Data were analyzed using full‐factorial four‐way ANOVA and Tukey test ( α = 0.05). Results All factors significantly influenced irradiance ( p < 0.001). Ceramic thickness exerted greatest influence ( F = 8270.89), followed by light source ( F = 7827.34), translucency ( F = 2001.89), and shade ( F = 55.02). Red light demonstrated significantly higher transmitted irradiance than blue light across all conditions. Conclusions Wavelength significantly affected transmitted irradiance, with red light penetrating more effectively than blue light.
DOI: 10.1111/jerd.70171
Institution: University of Florida
Language: English
Subfield: Orthodontics
Field: Dentistry
Domain: Health Sciences
Open Access status: green
Funder: National Institutes of Health
OpenAlex ID: W7156159659