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International Journal of Bioprinting Comparison of different 3D printing technologies

Table 3. Results of the printability study
Hydrogel Image Pr State of
gelation
CELLINK 1 Appropriate
Start

5% HaMA <1 Low

5% GelMA 1 Appropriate/
High
Figure 7. Comparative study of printability. Source: own elaboration.

Matrigel <1 Low

biodegradation characteristics. This last characteristic is
very interesting for the objectives proposed, as it would
allow our biomimetic scaffold to biodegrade as bone
regeneration takes place. In addition, PCL has been shown
Figure 8. Matrix formed by squares and rectangles of different dimen- to enhance and promote bone regeneration .
[36]
sions. Image obtained using Inventor software. Source: own elaboration.
In order to check the suitability of PCL for bioprinting
could not be correctly performed. The difference and to see the significant differences with respect to
between the theoretical value and the real value in the hydrogels, the above-mentioned tests were used. The only
area measurements is due, in most cases, to the fact that test that was not used is the sessile drop method, which does
the hydrogel did not achieve perfect 90° angles and that not provide any relevant information on thermoplastics.
at some points several layers of hydrogel overlapped,
generating small overflows. Table 5 shows the results of the PCL printing grid
test, where it can be stated that the previously designed
3.3. Study of printability of thermoplastics structure was reproduced with practically no difference
In this study, we used PCL as a non-toxic thermoplastic between the theoretical area and the real area. The filament
because of its good biocompatibility and slow collapse test shown in Table 6 demonstrates that PCL has

Volume 9 Issue 3 (2023) 33 https://doi.org/10.18063/ijb.680