@misc{10481/85330,
year = {2023},
month = {8},
url = {https://hdl.handle.net/10481/85330},
abstract = {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.},
organization = {FEDER/ Government
of Andalusia P20-00200},
organization = {support from the FEDER/ Government
of Andalusia P20-00200 and State of Rio Grande do Sul,
FAPERGS (grant #19/2551-0001721-9)},
organization = {Funding for open access
charge: Universidad de Granada / CBUA},
publisher = {Elsevier},
keywords = {3D-printed dental resin},
keywords = {Thickness},
keywords = {Printing orientation},
keywords = {Kubelka-Munk Theory},
keywords = {Scattering},
keywords = {Absorption},
keywords = {Transmission},
keywords = {Light reflectivity},
title = {Optical behavior of 3D-printed dental restorative resins: Influence of thickness and printing angle},
doi = {10.1016/j.dental.2023.08.003},
author = {Espinar Pulgar, Cristina and Della Bona, Alvaro and Tejada Casado, María de la Nativida and Pulgar Encinas, Rosa María and Pérez Gómez, María Del Mar},
}