Optical behavior of 3D-printed dental restorative resins: Influence of thickness and printing angle
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AuthorEspinar Pulgar, Cristina; Della Bona, Alvaro; Tejada Casado, María de la Nativida; Pulgar Encinas, Rosa María; Pérez Gómez, María Del Mar
3D-printed dental resinThicknessPrinting orientationKubelka-Munk TheoryScatteringAbsorptionTransmissionLight reflectivity
C. Espinar et al. Optical behavior of 3D-printed dental restorative resins: Influence of thickness and printing angle. Dental Materials 39 (2023) 894–902 [https://doi.org/10.1016/j.dental.2023.08.003]
SponsorshipFEDER/ Government of Andalusia P20-00200; support from the FEDER/ Government of Andalusia P20-00200 and State of Rio Grande do Sul, FAPERGS (grant #19/2551-0001721-9); Funding for open access charge: Universidad de Granada / CBUA
Objectives To evaluate the influence of thickness and printing angle on the optical properties of 3D-printed dental restorative resins. Methods Four 3D printing resin systems were evaluated: DFT-Detax Freeprint Temp; FP- Formlabs Permanent Crown; FP- Formlabs Temporary CB; and GCT- GC Temporary-. Samples from each material were printed at 0° and 90°, and polished up to 0.5, 1.0, 1.5 and 2.0 mm thickness. Scattering (S), absorption (K) and albedo (a) coefficients, transmittance (T%), light reflectivity (RI) and infinite optical thickness ( ) were calculated using Kubelka-Munk’s model. Data were statistically analyzed using Kruskal–Wallis¸ Mann-Whitney tests, and VAF coefficient. Results The spectral distribution on S, K, T%, RI, were wavelength dependent. Although the spectral behaviors were similar for all the specimens evaluated, the values of S, K, T% and presented significant differences between specimen thicknesses for all the materials used and for both printing orientations. Values for S and K increased, and T% and decreased. Significant differences between 0° and 90° were found for RI values at 0.5 and 1.0 mm thick samples, for S and K at 2.0 mm, for at 0.5 and 1.0 mm for DFT, and at 0.5 mm for FT. Conclusions Optical properties of 3D-printed restorative resins vary between thicknesses, and could be affected by the building orientation. Therefore, these factors should be considered in order to improve the biomimetic potential of 3D-printed dental restorative resins. Clinical significance Understanding the optical behavior of the 3D-printed restorative resins is essential to optimize their clinical performance.