Journal
MATERIALS
Volume 14, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/ma14195513
Keywords
robocasting; yttria-stabilized zirconia; acrylate polymers; X-ray microtomography; MG-63 human cell
Categories
Funding
- European Regional Development Fund (ERDF) from European Union [1,887,221.20 (SIFECAT 001-P-001646)]
- MINECO and FEDER funds [RTI2018-098951-B-I00]
- Generalitat de Catalunya [2017SGR359, 2017SGR0933]
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The study focused on preparing and characterizing a polymer-ceramic composite material for dental applications with properties of biocompatibility and resistance to fracture and wear. Results showed that the polymer infiltrated among the ceramic filaments acted as a safety damper, preventing crack propagation and ensuring material flexibility. The combination of fast robocasting of ceramic paste and covalent bonding of polymer adhesive demonstrated potential for future dental implant applications.
The aim of this work was to prepare and characterize polymer-ceramic composite material for dental applications, which must resist fracture and wear under extreme forces. It must also be compatible with the hostile environment of the oral cavity. The most common restorative and biocompatible copolymer, 2,2-bis(p-(2 & PRIME;-2-hydroxy-3 & PRIME;-methacryloxypropoxy)phenyl)propane and triethyleneglycol dimethacrylate, was combined with 3D-printed yttria-stabilized tetragonal zirconia scaffolds with a 50% infill. The proper scaffold deposition and morphology of samples with 50% zirconia infill were studied by means of X-ray computed microtomography and scanning electron microscopy. Samples that were infiltrated with copolymer were observed under compression stress, and the structure's failure was recorded using an Infrared Vic 2D(TM) camera, in comparison with empty scaffolds. The biocompatibility of the composite material was ascertained with an MG-63 cell viability assay. The microtomography proves the homogeneous distribution of pores throughout the whole sample, whereas the presence of the biocompatible copolymer among the ceramic filaments, referred to as a polymer-infiltrated ceramic network (PICN), results in a safety damper , preventing crack propagation and securing the desired material flexibility, as observed by an infrared camera in real time. The study represents a challenge for future dental implant applications, demonstrating that it is possible to combine the fast robocasting of ceramic paste and covalent bonding of polymer adhesive for hybrid material stabilization.
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