The output of each light-curing unit was analyzed using a 6-inch integrating sphere (Labsphere, North Sutton, NH, USA) attached to a fiberoptic spectrophotometer (USB 4000, Ocean Optics, Dunedin, FL, USA) [30 (link)]. The spectrophotometer was calibrated using a National Institute of Standards and Technology (Gaithersburg, MD, USA) traceable light source (Labsphere). Each light-curing unit tip was placed at the entrance of the sphere to calculate the light-curing unit output using Spectrasuite v2.0.162 software (Ocean Optics). The radiant emittance values were obtained from the power output emitted between 340 nm and 550 nm [31 (link)].
6 inch integrating sphere
Manufactured by Labsphere
Sourced in United States
The 6-inch integrating sphere is a laboratory instrument designed to measure the total radiant flux or luminous flux of a light source. It functions by evenly distributing and integrating the light emitted from the source within its inner cavity, allowing for accurate and reproducible measurements.
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Lab products found in correlation
3 protocols using 6 inch integrating sphere
1
Integrating Sphere Spectrum Analysis
2
Measuring LCU Light Tip Irradiance
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A 6-inch integrating sphere (Labsphere, North Sutton, NH, USA) attached to a fiberoptic spectrometer (USB 4000, Ocean Insight, Largo, FL, USA) was used to measure the total radiant power from the LCU five times without, and then five times with barriers in all the various tested conditions. The LCU light tip was placed at the 12.5 mm diameter entrance to the integrating sphere, and all the light from the LCU tip was captured. The measurement system, comprising the spectrometer, optical fiber, and integrating sphere, was calibrated before use.
The mean irradiance across the light-emitting surface of the tip was calculated as the quotient of the average of the five radiant power values and the internal optical area of the LCU tip [23 ]. This result provided an averaged single irradiance value across the entire light tip.
The mean irradiance across the light-emitting surface of the tip was calculated as the quotient of the average of the five radiant power values and the internal optical area of the LCU tip [23 ]. This result provided an averaged single irradiance value across the entire light tip.
3
Spectral Radiant Power Measurement of LCU
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The spectral radiant power from the Valo LCU was measured with the use of a 6-inch integrating sphere (Labsphere, North Sutton, NH, USA) connected to a fiber-optic spectrometer (USB 4000, Ocean Optics, Dunedin, FL, USA). Since all specimens had a diameter of 4 mm, the output was also measured through a 4-mm-diameter aperture placed over the entrance to the integrating sphere, to ensure accurate measurements of the spectral radiant power and irradiance received by the specimens and not the total power output emitted from the LCU. Spectrasuite v2.0.162 software (Ocean Optics Dunedin, FL, USA) was used to collect and analyze the data. All curing modes were performed with the same curing unit, to standardize the spectral emission for all tested samples.
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