Table 3.

The comparison of stress and Young's elastic modulus between FDM, FDMS, FDMG, and normal control group, respectively (one-way ANOVA with Bonferroni correction).

Group	Strain (percentage)	Stress (Mpa)	p ∗	Young's elastic modulus (Mpa)	p ∗∗
Normal	2	0.97 ± 0.43		1.99 ± 0.8
	6	10.65 ± 2.33		3.67 ± 0.59
	10	20.62 ± 5.28		4.27 ± 0.88
	14	29.38 ± 7.23		4.51 ± 0.89
FDM	2	0.74 ± 0.41	0.456	1.74 ± 0.87	0.291
	6	6.37 ± 2.83	0.034	2.70 ± 1.0	0.074
	10	13.60 ± 5.12	0.028	3.28 ± 1.0	0.067
	14	21.33 ± 6.72	0.016	3.56 ± 0.90	0.109
FDMS	2	1.02 ± 0.57	0.881	2.15 ± 1.28	0.436
	6	11.69 ± 2.16	0.595	4.07 ± 0.88	0.464
	10	21.17 ± 4.07	0.647	4.41 ± 0.91	0.789
	14	30.54 ± 7.56	0.768	4.53 ± 1.11	0.807
FDMG	2	1.92 ± 1.03	0.005	3.66 ± 1.25	0.000
	6	17.12 ± 7.0	0.002	5.60 ± 1.70	0.001
	10	31.28 ± 8.72	0.001	6.19 ± 1.53	0.001
	14	44.22 ± 11.69	0.001	6.18 ± 1.65	0.002

“p ^∗” refers to the difference of stress between the FDM, FDMS, FDMG, and normal control group, respectively. “p ^∗∗” refers to the difference of Young's elastic modulus between the FDM, FDMS, FDMG, and normal control group, respectively.