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[Optical properties of LED light curing unit before and after transmitting different colors and thickness of two kinds of glass ceramics]. | LitMetric
Purpose : To study the optical properties of two common dental light curing units and the optical properties of the transmitted light after transmitting glass ceramics.Methods : Two types of glass-ceramic disc named IPS e.max CAD and IPS Empress CAD were produced by CAD/CAM technology, and the colors of A2 and A3 were chosen for each type of glass ceramic, then divided into 4 groups. Eight discs were made 0.5 mm to 4.0 mm thick in each group, the total number was 32. Spectra irradiance meter and power meter were used to measure the central wavelengths and irradiance of 3 power modes of 2 new LED light curing units before and after transmitting glass-ceramic discs. Statistical analysis was performed using SPSS 25.0 software package.Results : Under different power modes of light curing units, different types and colors of glass ceramics, the central wavelengths of transmitted light were significantly different (P<0.05). Under different power modes of light curing units, different types, colors and thicknesses of glass ceramics, the irradiance of transmitted light was significantly different (P<0.05).Conclusions : The power mode of light curing unit, the type and color of the glass ceramic have influence on the central wavelength of the transmitted light, but the thickness of the glass ceramic has no influence on the central wavelength of the transmitted light. The power mode of the light curing unit, the type, color, and thickness of the glass ceramic have influence on the irradiance of the transmitted light, in which glass ceramic thickness has the most significant effect on the attenuation of the irradiance of the transmitted light.
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