Are Nano TiO<sub>2</sub> Inclusions Improving Biocompatibility of Photocurable Polydimethylsiloxane for Maxillofacial Prosthesis Manufacturing?
2021
Eugenia Eftimie Totu | Corina Marilena Cristache | Viorel Stefan Perieanu | Mihai Burlibasa | Daniel Costinel Petre | Liliana Burlibasa
(1) Background: The development of a biocompatible material for direct additive manufacturing of maxillofacial extraoral prosthesis is still a challenging task. The aim of the present study was to obtain a photocurable PDMS, with nano TiO<sub>2</sub> inclusions, for directly 3D printing of extraoral, maxillofacial prosthesis. The biocompatibility of the newly obtained nanocomposite was also investigated; (2) Methods: 2.5% (m/m) titania nanoparticles (TiO<sub>2</sub>) oxide anatase and a photoinitiator, benzophenone (BF) 4.5% were added to commercially available PDMS for maxillofacial soft prostheses manufacturing. The three different samples (PDMS, PDMS-BF and PDMS-BF-TiO<sub>2</sub>) were assessed by dielectric curing analysis (DEA) based on their viscosities and curing times. In vitro micronucleus test (MNvit) was performed for genotoxicity assessment and three concentrations of each compounds (2 mg/L, 4 mg/L and 8 mg/L) were tested in duplicate and compared to a control; (3) Results: The nanocomposite PDMS-BP-TiO<sub>2</sub> was fully reticulated within a few minutes under UV radiation, according to the dielectric analysis. PDMS-BF-TiO<sub>2</sub> nanocomposite showed the lowest degree of cyto- and genotoxicity; (4) Conclusions: In the limits of the present study, the proposed ex situ preparation of a PDMS-BP-TiO<sub>2</sub> offers an easy, simple, and promising technique that could be successfully used for 3D printing medical applications.
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