Abstract
(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 TiO2 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 (TiO2) 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-TiO2) 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-TiO2 was fully reticulated within a few minutes under UV radiation, according to the dielectric analysis. PDMS-BF-TiO2 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-TiO2 offers an easy, simple, and promising technique that could be successfully used for 3D printing medical applications.
Highlights
Maxillofacial prostheses, used for the rehabilitation of patients with congenital or acquired disabilities, are classified as extraoral, intraoral and complex [1]
In our previous studies [10,15,16] we found that samples with high concentrations of compounds or nanomaterials in lymphocyte culture cannot be used for genotoxicity assessment because they exceed the maximum allowed concentrations for a correct assessment without false positive results
The aim of the present research was to obtain a photocurable PDMS with improved characteristics to be used for soft maxillofacial prosthesis manufacturing using Vat photopolymerization as 3D printing technique
Summary
Maxillofacial prostheses, used for the rehabilitation of patients with congenital or acquired disabilities, are classified as extraoral (replacing nose, eye, orbit, ear, or face parts), intraoral (replacing parts of the maxilla, middle face, and mandible) and complex (replacing extraoral and intraoral anatomical parts) [1]. FFoorreexxtrtaraooraral lpprorostshtheessisis, ,ththeemmaateteriraial luuseseddnneeededsstotommimimicicsosfotf-tt-itsissusueechcharaarcatcetreirsitsitciscsinin tetermrmssooffvviissuuaall aanndd ttaaccttiilleepprrooppeerrtiteiess, ,bbeieninggsismimulutaltnaenoeuosulyslyphpyhsyicsaicllayllaynadncdhecmheicmalilcyalsltyastbalbe,lea,saws wellelalsahsahvaivnigngmmicricorboiboiloolgoigcaiclarlerseissitsatnacneceanadndbiboicoocmompaptaibtiibliitlyity[3[]3.]
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