TY  - THES
A1  - Klarner, Michael
T1  - 3D-Pulverdruck von Calciumphosphat-Keramiken mit polymeren und anorganischen Bindersystemen
T1  - Polymer and inorganic 3D-rapid prototyping systems to build calciumphospate-ceramics
N2  - Die vorliegende Arbeit hatte die Herstellung phasenreiner ß-Tricalciumphosphat (ß-TCP) - Implantate durch 3D-Pulverdruck zum Ziel. Variiert wurden hierbei die zum Druck verwendeten Pulver-Binder-Systeme. Als Verfestigungsmechanismen wurden hydraulisch abbindende Pulver-Binder-Systeme aus Tricalciumphosphat / Phosphorsäure bzw. Tetracalciumphosphat / Citronensäure untersucht, sowie der Zusatz quellfähiger Polymere zum Pulver, etwa Polyacrylsäure oder Hydroxypropylmethyl-Cellulose. Die gedruckten Strukturen wurden anschließend in Hinblick auf die zu erreichende Auflösung, die mechanischen Eigenschaften und die Zusammensetzung des Endproduktes verglichen.
N2  - Custom made ß-tricalcium phosphate (ß-TCP) bone substitutes with a macroporous architecture were fabricated in this study using 3D powder printing with three different preparation strategies and analysed with regard to their mechanical and physical properties. Samples were either obtained by (A) using hydroxypropylmethylcellulose (5wt%) modified TCP (Ca/P=1.5) powder with water as a binder, (B) by using phosphoric acid (10%) as a binder with a calcium phosphate powder of a Ca/P ratio of 1.7 and different binder/volume ratios or (C) by printing a tetracalcium phosphate (Ca/P=2.0) / dicalcium phosphate (Ca/P=1.0) / tricalcium phosphate powder mixture with citric acid (25wt%). The production process was followed by a heat treatment at 1100°C for all variations to produce phase pure ß-TCP (Ca/P=1.5). The results showed that ß-TCP samples fabricated according to method (B) showed the best printing resolution with a minimum macropore diameter of approximately 500µm and a compressive strength of up to 7.4 ± 0.7 MPa. Since the samples could be removed from the powder bed immediately after printing, this method would significantly decrease processing time for commercial fabrication.
KW  - Rapid Prototyping
KW  - Biomaterial
KW  - 3D-Pulverdruck
KW  - Calciumphosphat
KW  - Tricalciumphosphat
KW  - Knochenersatzwerkstoff
KW  - Biokompatibel
KW  - ß-tricalcium phosphate
KW  - beta TCP
KW  - 3D - rapid prototyping
KW  - bone substitute
Y1  - 2009
UR  - https://opus.bibliothek.uni-wuerzburg.de/frontdoor/index/index/docId/2948
UR  - https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-36373
ER  -