Aim: The aim of this study is to compare the effectiveness of polymerization of nanohybrid composite resins with different colors and thicknesses, photocured by units of different wavelengths through Knoop microhardness (KHN) and Berkovich nanohardness (DUH). Materials and methods: One hundred twenty specimens of Tetric N-Ceram (Ivoclar/Vivadent) were divided into groups (n = 5) according to the experimental test, the color of the composite resin (A2 and Bleach-M/BM), the light source: monowave

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... (Elipar™ FreeLight DeepCure-3M/ ESPE), dental products-1200 mW/cm²/15 seconds (FL); or polywave (Bluephase-Ivoclar/Vivadent 1200 mW/cm²/15 and 30 seconds (BP), and thickness (irradiated surface,1, 2, and 3 mm). The specimens were stored dry for 24 hours at 37°C and received five indentations on the top and button surfaces. Analysis of variance (ANOVA), Tukey, and Pearson correlation (p < 0.01%) tests were used. Results: A direct correlation was found between KHN and DUH. The higher values of KHN and DUH were observed with Elipar™ FreeLight DeepCure unit in irradiated surface and 1-mm-thick specimens at A2 color. Conclusion: That Elipar™ FreeLight DeepCure unit showed better effectiveness in curing nanohybrid composite resins, used in this work, in different colors and depths as compared to Bluephase in both experimental tests, and that DUH can substitute KHN test when comparing the effectiveness of polymerization. Clinical significance: The evaluation of the mechanical properties of composite resins is essential to verify their possible clinical performance. and Ivocerin. While the PPD absorption spectrum extends from the ultraviolet (UV) wavelength to approximately 490 nm, APO and Lucirin-trimethylbenzoyldiphenyl phosphine oxide (TPO) mainly absorb light in the UV range, with sensitivity peaks of approximately 370 nm and 420 nm, respectively. 10 The presence of these photoinitiators can reduce the efficiency of photoactivation when a single-peak light-emitting diode (LED) (450-470 nm) is used. For this reason, photopolymerizing equipment capable of emitting blue and violet lights within the specific wavelength bands was introduced, known as "polywave," "multiple peak" or "multiple wave" lights. 11,12 Although monowave Effect of LEDs on Composite Resins