[Analysis of the mechanical properties of a material of temporary structures manufactured by direct method and provisional crowns made by 3D printing].

The aim of this work is to study the mechanical properties of temporary composite crowns and temporary composite orthopedic structures manufactured by 3D printing.

Materials and methods: For the two studied groups of samples: the original 3D-printed samples and the poured samples from a composite material of a certain shape, 8 samples were made and visually checked for the absence of porosity. The strength and elasticity were measured using the three-point bending method and the hardness was measured using the indentation method.

Results: For both materials, the hardness, flexural strength and flexural elasticity show consistently high values required by GOST 24621-2015 (ISO 868:2003) [Plastics and ebonite] and GOST 4648-2014 (ISO 178:2010) [Plastics]. However, the statistical data on bending are higher for the composite material, with a larger spread of the elastic modulus value, in contrast to the 3D-printed samples.

Conclusion: Both materials are suitable for the manufacture of temporary orthopedic structures. For a more accurate assessment, it is necessary to continue studying the 3D-printed material for cytotoxicity, water absorption, and microstructure.