Physical Properties of a Filler-Containing Dental 3D Printing Resin Processed Using Printer Systems with Different Light-Source Wavelengths.

This study compared the physical properties and color stability of specimens fabricated from a commercial filler-containing dental 3D printing resin using printer systems equipped with 405 or 385 nm light sources. Specimens were subjected to three-point flexural strength, Vickers hardness, water sorption, solubility, and color stability tests. Color stability was evaluated under dry (A), water-immersed (B), light-shielded (C), and light-exposed (D) conditions, and color differences (ΔE00) were calculated using the CIEDE2000 formula. Data were analyzed using Student's t-test or Welch's t-test, as appropriate (α = 0.05). Flexural strength and Vickers hardness were significantly higher, and solubility was significantly lower, in the 385 nm group than in the 405 nm group (p < 0.05), whereas water sorption did not differ significantly. The ΔE00 values were below the clinically acceptable threshold of 1.77 for all comparisons except A-B in the 405 nm group. The A-B and A-C values were significantly lower in the 385 nm group, whereas the B-C value was significantly higher (p < 0.05); no significant difference was observed for C-D. These findings suggest that differences between printer systems, including light-source wavelength, should be considered when fabricating dental prostheses using 3D printing resins.