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<p>In the past two decades, studies have been reported using biocompatible polylactic acid (PLA) based functional prototypes as orthodontic splints. However, less has been reported on reinforcing laser powder bed fusion (LPBF) waste recycled powder of 17-4-precipitated hardened (PH) stainless steel (SS) in the PLA matrix for customized mechanical and morphological properties. This study demonstrates the fabrication of 97 (wt.%) of PLA reinforced with 3 (wt.%) 17-4-PH-SS-based functional prototypes (selected based on melt flow index (MFI) observations) for orthodontic applications. The filament of <i>ϕ</i>1.75 ± 0.05 mm was fabricated using a single screw extruder (SSE) at the screw temperature of 190&#xa0;°C and screw speed of 6 rpm. The tensile and compressive specimens were fabricated using fused filament fabrication (FFF). The general linear model (GLM) for processing on FFF suggested that the best input parameters for the fabrication of 97% PLA reinforced with 3%-17-4-PH-SS are nozzle temperature (NT) of 210&#xa0;°C, infill pattern (IP) cross, and infill percentage (IP) of 40%. The results are supported by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The results indicate a significant improvement in the mechanical and morphological properties of the PLA-17-4-PH-SS composite-based functional prototypes for orthodontic applications.</p>

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On 3D Printing of Polylactic Acid-17-4 Precipitate Hardened Stainless Steel Composite for Orthodontic Applications

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Minhaz Husain,
  • Gurwinder Singh,
  • Ajit Kumar,
  • Vinay Kumar,
  • Ranvijay Kumar,
  • Rupinder Singh

摘要

In the past two decades, studies have been reported using biocompatible polylactic acid (PLA) based functional prototypes as orthodontic splints. However, less has been reported on reinforcing laser powder bed fusion (LPBF) waste recycled powder of 17-4-precipitated hardened (PH) stainless steel (SS) in the PLA matrix for customized mechanical and morphological properties. This study demonstrates the fabrication of 97 (wt.%) of PLA reinforced with 3 (wt.%) 17-4-PH-SS-based functional prototypes (selected based on melt flow index (MFI) observations) for orthodontic applications. The filament of ϕ1.75 ± 0.05 mm was fabricated using a single screw extruder (SSE) at the screw temperature of 190 °C and screw speed of 6 rpm. The tensile and compressive specimens were fabricated using fused filament fabrication (FFF). The general linear model (GLM) for processing on FFF suggested that the best input parameters for the fabrication of 97% PLA reinforced with 3%-17-4-PH-SS are nozzle temperature (NT) of 210 °C, infill pattern (IP) cross, and infill percentage (IP) of 40%. The results are supported by scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. The results indicate a significant improvement in the mechanical and morphological properties of the PLA-17-4-PH-SS composite-based functional prototypes for orthodontic applications.