. 2019 Oct 24;5:100032. doi: 10.1016/j.mtbio.2019.100032

Table 3.

Mechanical characteristics from uniaxial compression tests on different stocks of BA and HA (compression parallel to the grain for BA).

Sample set	Geometrical properties				Uniaxial compression test
Sample set	ϕ [mm]	H [mm]	A $[{mm}^{2}]$	ρ $[g / {cm}^{3}]$	$σ_{c ∥}$ [MPa]	$E_{c ∥}$ [MPa]	$ρ / ρ_{0}$ [−]
# 1	14.30	19.89	160.62	1.39	$6.5 \pm 3.0$	$216 \pm 99$	0.95
# 2	15.21	19.83	181.62	1.49	$7.7 \pm 1.6$	$79 \pm 13$	1.01
# 3	29.35	31.13	511.29	1.56	$10.8 \pm 2.9$	$1011 \pm 448$	1.06
# 4	19.47	31.22	213.27	1.44	$12.3 \pm 3.2$	$2201 \pm 147$	0.96
HA 1	10.07	14.29	79.59	0.54	$6.2 \pm 2.5$	$239 \pm 131$	0.36
HA 2	10.03	14.75	79.05	2.07	$5.6 \pm 1.6$	$79 \pm 23$	1.41

HA, hydroxyapatite; BA, biomorphic apatite.

On the left, the averages of the geometrical properties of each stock are shown: ϕ is the main dimension of the samples' base (which corresponds to the outer diameter of samples $# 1, # 2, # 3$ and to a side of the prismatic sample $# 4$ ); H is the height; A is the average cross-sectional area, and ρ is the average density. On the right, the following average properties ( $\pm$ standard deviation) are reported (from left to right): compressive strength and Young modulus. Finally, $ρ / ρ_{0}$ is the ratio between the density and the reference density of $1.47 g / {cm}^{3}$ to which all mechanical values have been reported.