Development of a solvent-free polylactide/calcium carbonate composite for selective laser sintering of bone tissue engineering scaffolds

被引：98

作者：

Gayer, Christoph ^{[1
]}

Ritter, Jessica ^{[2
]}

Bullemer, Martin ^{[3
,8
]}

Grom, Stefanie ^{[4
]}

Jauer, Lucas ^{[1
]}

Meiners, Wilhelm ^{[1
,9
]}

Pfister, Andreas ^{[3
]}

Reinauer, Frank ^{[4
]}

Vucak, Marijan ^{[5
]}

Wissenbach, Konrad ^{[1
]}

Fischer, Horst ^{[2
]}

Poprawe, Reinhart ^{[6
]}

Schleifenbaum, Johannes Henrich ^{[7
]}

机构：

[1] Fraunhofer Inst Laser Technol ILT, Steinbachstr 15, D-52074 Aachen, Germany

[2] RWTH Aachen Univ Hosp, Dept Dent Mat & Biomat Res, Pauwelsstr 30, D-52074 Aachen, Germany

[3] EOS GmbH, Robert Stirling Ring 1, D-82152 Krailling Munich, Germany

[4] Karl Leibinger Med Tech GmbH & Co KG, Kolbinger Str 10, D-78570 Muhlheim Donau, Germany

[5] SCHAEFER KALK GmbH & Co KG, Louise Seher Str 6, D-65582 Diez, Germany

[6] Rhein Westfal TH Aachen, Chair Laser Technol LLT, Steinbachstr 15, D-52074 Aachen, Germany

[7] Rhein Westfal TH Aachen, DAP, Steinbachstr 15, D-52074 Aachen, Germany

[8] AMCM GmbH, Petersbrunner Str 1b, D-82319 Starnberg, Germany

[9] TRUMPF GmbH Co KG, Campus Blvd 79, D-52074 Aachen, Germany

来源：

MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS | 2019年 / 101卷

关键词：

Polylactic acid (PLA); Additive manufacturing; Laser powder bed fusion; Selective laser melting; Biodegradable polymer implant; BETA-TRICALCIUM PHOSPHATE; 3 BALLS TEST; POLYCAPROLACTONE SCAFFOLDS; IN-VITRO; MECHANICAL-PROPERTIES; TITANIUM IMPLANTS; BRITTLE DISCS; POLYMERS; BIOCOMPATIBILITY; CRANIOPLASTY;

D O I：

10.1016/j.msec.2019.03.101

中图分类号：

TB3 [工程材料学]; R318.08 [生物材料学];

学科分类号：

0805 ; 080501 ; 080502 ;

摘要：

Since large bone defects cannot be healed by the body itself, continuous effort is put into the development of 3D scaffolds for bone tissue engineering. One method to fabricate such scaffolds is selective laser sintering (SLS). However, there is a lack of solvent-free prepared microparticles suitable for SLS. Hence, the aim of this study was to develop a solvent-free polylactide/calcium carbonate composite powder with tailored material properties for SLS. Four composite powders with a composition of approximately 75 wt% polylactide (PLLA as well as PDLLA) and 25 wt% calcium carbonate (calcite) were prepared by a milling process based on GMP standards. Four different grades of polylactide were chosen to cover a broad inherent viscosity range of 1.0-3.6 dl/g. The composite material with the lowest inherent viscosity (1.0 dl/g) showed the best processability by SLS. This was caused by the small polymer particle diameter (50 mu m) and the small zero-shear melt viscosity (400 Pa.s), which led to fast sintering. The SLS process parameters were developed to achieve low micro-porosity (approx. 2%) and low polymer degradation (no measurable decrease of the inherent viscosity). A biaxial bending strength of up to 75 MPa was achieved. Cell culture assays indicated good viability of MG-63 osteoblast-like cells on the SLS specimens. Finally, the manufacture of 3D scaffolds with interconnected pore structure was demonstrated. After proving the biocompatibility of the material, the developed scaffolds could have great potential to be used as patient-specific bone replacement implants.

引用

页码：660 / 673

页数：14

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