The Effects of Washing and Formaldehyde Sterilization on the Mechanical Performance of Poly(methyl Methacrylate) (PMMA) Parts Produced by Material Extrusion‐Based Additive Manufacturing or Material Jetting. Issue 7 (26th May 2022)

• Record Type: Journal Article
• Authors: Petersmann, Sandra; Hentschel, Lukas; Gonzalez-Gutierrez, Joamin; Tödtling, Martin; Schäfer, Ute; Arbeiter, Florian; Üçal, Muammer
• Other Names: Grießer Thomas guestEditor.; Eckert Jürgen guestEditor.
• Is Part Of: Advanced engineering materials. Volume 25:Issue 7(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-05-26
• Subjects: ARBURG plastic freeforming -- fused filament fabrication -- mechanical properties -- PMMA -- washing and formaldehyde sterilization; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.202200225
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : Nowadays, personalized medical implants are frequently produced through additive manufacturing. As all medical devices have to undergo specific washing and sterilization before application, the effects of a predefined cleaning routine that is available to the clinical institutes, washing with chemical agent and formaldehyde fumigation, on the mechanical behavior of printed parts are examined. Mechanical properties of parts manufactured by fused filament fabrication (FFF) and ARBURG plastic freeforming (APF) using two poly(methyl methacrylate) (PMMA)‐based materials, 3Diakon and CYROLITE MD H12, respectively, are analyzed using flexural and impact tests. An influence of cleaning treatments on the mechanical properties of APF samples is not detected. FFF samples, however, show lower impact strength after washing, but not after sterilization. The fracture surfaces, porosity values, or chemical structure assessed by Fourier‐transform infrared (FTIR) spectroscopy could not explain this decrease. Influence of the cleaning treatments on the material itself is assessed using thin compression‐molded specimens. The influence on the stress–strain curves is negligible, apart from a slight but significant reduction in the yield stress. FTIR spectroscopy and scanning electron microscopy analyses of the fracture surfaces do not show detectable differences among differentially treated samples. Abstract : The influence of formaldehyde sterilization and preceding washing on the mechanical behavior of two poly(methyl methacrylate)‐based materials is analyzed. Each material is optimized for a different additive manufacturing method (fused filament fabrication and ARBURG plastic freeforming). Flexural and impact tests as well as microcomputed tomography analyses are performed. The observed porosity levels (<1%) do not influence the mechanical properties.