TY  - JOUR
A1  - Götz, Lisa-Marie
A1  - Holeczek, Katharina
A1  - Groll, Jürgen
A1  - Jüngst, Tomasz
A1  - Gbureck, Uwe
T1  - Extrusion-Based 3D Printing of Calcium Magnesium Phosphate Cement Pastes for Degradable Bone Implants
T2  - Materials
N2  - This study aimed to develop printable calcium magnesium phosphate pastes that harden by immersion in ammonium phosphate solution post-printing. Besides the main mineral compound, biocompatible ceramic, magnesium oxide and hydroxypropylmethylcellulose (HPMC) were the crucial components. Two pastes with different powder to liquid ratios of 1.35 g/mL and 1.93 g/mL were characterized regarding their rheological properties. Here, ageing over the course of 24 h showed an increase in viscosity and extrusion force, which was attributed to structural changes in HPMC as well as the formation of magnesium hydroxide by hydration of MgO. The pastes enabled printing of porous scaffolds with good dimensional stability and enabled a setting reaction to struvite when immersed in ammonium phosphate solution. Mechanical performance under compression was approx. 8–20 MPa as a monolithic structure and 1.6–3.0 MPa for printed macroporous scaffolds, depending on parameters such as powder to liquid ratio, ageing time, strand thickness and distance.
KW  - magnesium phosphate cement
KW  - extrusion-based 3D printing
KW  - degradable implant
Y1  - 2021
UR  - https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/24611
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-246110
SN  - 1996-1944
VL  - 14
IS  - 18
ER  -