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Punset M, Brizuela‐Velasco A, Pérez-Pevida E, Herrero‐Climent M, Manero JM, Gil J. Mechanical Characterization of Dental Prostheses Manufactured with PMMA–Graphene Composites. Materials. 2022. doi:10.3390/ma15155391
AutoresMiquel Punset, Aritza Brizuela‐Velasco, Esteban Pérez-Pevida, Mariano Herrero‐Climent, José María Manero, Javier Gil
Este estudio investiga la influencia de la adición de grafeno a polimetilmetacrilato (PMMA), un material comúnmente empleado en prótesis dentales, evaluando sus propiedades mecánicas. Se analizaron la dureza Shore y Vickers, la resistencia a la compresión y el módulo de Young, así como el desgaste y los coeficientes de fricción. Los resultados indican que incluso una pequeña cantidad de grafeno (aproximadamente 0.1% en peso) mejora significativamente la resistencia a la compresión y el módulo de Young, además de reducir la tasa de desgaste, aunque los coeficientes de fricción apenas varían. Estos hallazgos son relevantes para el desarrollo de materiales protésicos más duraderos y estables, dado que las propiedades estéticas de estas formulaciones con grafeno ya son un atractivo principal.
The use of a PMMA composite with graphene is being commercialized for application as dental prostheses. The different proportions of fibers provide a wide range of colors that favors dental esthetics in prostheses. However, there are no studies that have explained the influence that graphene has on the mechanical properties. In this contribution, we studied the PMMA and PMMA material with graphene fibers (PMMA-G) in the form of discs as supplied for machining. The presence of graphene fibers has been studied by Raman spectroscopy and the Shore hardness and Vickers micro hardness were determined. Mechanical compression tests were carried out to obtain the values of maximum strength and Young’s modulus (E) and by means of pin-on-disc wear tests, the specific wear rate and the friction coefficients were determined following the established international standards. Finally, the samples were characterized by field emission scanning electron microscopy (FESEM) to characterize the graphene’s morphology inside the PMMA. The results showed the presence of graphene in PMMA and was estimated in an amount of 0.1027% by weight in G-PMMA. The Shore hardness and Vickers microhardness values did not show statistically significant differences. Differences were observed in the compression maximum strength (129.43 MPa for PMMA and 140.23 for PMMA-G) and E values (2.01 for PMMA and 2.89 GPa for PMMA-G) as well as in the lower wear rate for the G-PMMA samples (1.93 × 10−7 for PMMA and 1.33 × 10−7 mm3/N·m) with a p < 0.005. The coefficients of friction for PMMA-G decreased from 0.4032 for PMMA to 0.4001 for PMMA-G. From the results obtained, a slight content in graphene produced a significant improvement in the mechanical properties that could be observed in the prosthesis material. Therefore, we can state that the main attraction of this material for dental prosthesis is its esthetics.
Punset M, Brizuela‐Velasco A, Pérez-Pevida E, Herrero‐Climent M, Manero JM, Gil J. Mechanical Characterization of Dental Prostheses Manufactured with PMMA–Graphene Composites. Materials. 2022. doi:10.3390/ma15155391
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