Long-Term Creep and Impact Strength of Biocompatible 3D-Printed PLA-Based Scaffolds

Abstract

In the present work porous scaffolds for trabecular bone defects replacement were studied. PLA and PLA/HA сomposites were obtained by extrusion. Scaffolds were obtained by 3D-printing by fused filament fabrication method. Long-term creep and Charpy impact tests show that PLA/HA scaffolds with the maximum force for destruction at impact of 119 N can function under a load of up to 10 MPa without shape changing and loss of mechanical properties. In vivo tests were used to investigate biocompatibility of scaffolds. The scaffolds may be used as implants for unloaded small bone defects replacement

Recent Advances in 3D Printing of Aliphatic Polyesters

“…To date, the most common technique for 3D printing of PLA is fused deposition modeling [ 12 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. Printing parameters such as build orientation, layer thickness, raster angle, raster width, air gap, infill density and pattern, feed rate and others directly influence the quality and the mechanical properties of the FDM printed parts [ 35 ].…”

“…Good improvement of properties was achieved by adding 15 wt.% of nano-hydroxyapatite (HA) to PLA [ 47 , 48 ]. The composite was extruded in filaments and then 3D printed at a nozzle temperature of 220 °C [ 47 ]. Long-term creep test revealed a superior hardness of the 3D-printed composite as compared with PLA scaffold and consequently an increase in creep resistance.…”

Recent Progress on 3D‐Printed Polylactic Acid and Its Applications in Bone Repair

“…Long‐term creep tests are one of the most important tests for bone implants. Long‐term creep and impact tests have shown that the PLA/HA support can withstand 119 N impact (10 MPa load) without changing shape and losing its mechanical properties, this intensity is very close to the strength of the human cancellous bone (1–12 MPa) . Therefore, PLA parts fabricated by FDM have great potential for use as a medical implant material.…”

Pozzolan Based 3D Printing Composites: From the Formulation Till the Final Application in the Precision Irrigation Field

“…This technique offers the possibility of printing complex structures, the fabrication of objects already assembled, and the production of personalized products. Importantly, FFF enables the use of less materials compared to conventional manufacturing methods and has lower distribution emissions, which renders this technique an attractive environmentally sustainable manufacturing process [ 4 , 5 ].…”