13 May 2015 Odontological light-emitting diode light-curing unit beam quality
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The distribution of light intensity of three light-curing units (LCUs) to cure the resin-based composite for dental fillings was analyzed, and a homogeneity index [flat-top factor (FTF)] was calculated. The index is based on the M2 index, which is used for laser beams. An optical spectrum analyzer was used with an optical fiber to produce an x-y power profile of each LCU light guide. The FTF-calculated values were 0.51 for LCU1 and 0.55 for LCU2, which was the best FTF, although it still differed greatly from the perfect FTF=1, and 0.27 for LCU3, which was the poorest value and even lower than the Gaussian FTF=0.5. All LCUs presented notably heterogeneous light distribution, which can lead professionals and researchers to produce samples with irregular polymerization and poor mechanical properties.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Thales Ribeiro de Magalhães Filho, Karin de Mello Weig, Marcelo Martins Werneck, Célio Albano da Costa Neto, Marysilvia Ferreira da Costa, "Odontological light-emitting diode light-curing unit beam quality," Journal of Biomedical Optics 20(5), 055005 (13 May 2015). https://doi.org/10.1117/1.JBO.20.5.055005 . Submission:

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