Aplicação da impressão 3D e reconstrução digital no desenvolvimento de próteses maxilofaciais

Abstract

Additive Manufacturing (AM) currently has several applications in healthcare, such as the construction of biomodels to support surgeries, the adaptation of medical products and the construction of tools for the manufacture of prostheses and orthoses. In this context, we propose the application of three-dimensional (3D) and AM scanning in the development of Rapid Tooling (RT) for manufacturing maxillofacial prostheses. The 3D digitization allows the acquisition of the geometric shape of the patient and the prosthesis and from this data is made a 3D model of the mold to obtain the prosthesis. The 3D model is exported in STL (Stereolithography) format and using software is sliced and printed using binder blasting technology which requires post processing with infiltrating material to improve the mechanical strength of the mold. This infiltrating material should also allow the polymerization of MDX4-4210 maxillofacial elastomer silicone. In total, six coating groups were tested and it was concluded that cyanocrilate coating with the addition of a stained glass varnish layer was the best option for mold making. The process was successfully applied in a clinical case, and it is concluded that the use of RF in the production of maxillofacial prosthesis is not only feasible, but its use has improved prosthesis shape, edge thickness and patient adaptation when compared to the prostheses produced in the conventional process.