Table 3.

Mean a* values of the 3D printable material specimens after different storage periods.

Specimen Thickness	Storage Period	HA2			HA3			NN1			NA3			DA3
		Mean	SD		Mean	SD		Mean	SD		Mean	SD		Mean	SD
1 mm	1 hour	7.02	0.45	d	7.14	0.44	c	5.09	0.19	a	3.61	0.88	b	2.44	0.56	c
	1 day	7.95	0.70	c	11.13	1.11	b	5.11	0.25	a	4.58	0.65	a	3.79	0.62	a
	1 week	11.91	0.65	b	18.46	0.63	a	5.17	0.16	a	4.82	0.27	a	3.80	0.43	a
	1 month	14.74	0.72	a	17.97	1.17	a	5.02	0.21	a	3.31	0.33	b	2.99	0.33	b
	6 months	4.33	0.53	e	6.37	0.89	c	−1.76	0.06	b	−3.48	0.29	c	−3.43	0.22	d
2 mm	1 hour	6.03	0.28	d	6.46	0.32	d	4.47	0.12	a	0.64	0.67	d	0.69	0.43	d
	1 day	7.08	0.61	c	8.52	0.69	c	4.38	0.09	a	1.85	0.51	c	2.19	0.56	c
	1 week	10.86	0.87	b	14.99	0.76	b	4.40	0.07	a	4.37	0.14	a	4.93	0.31	a
	1 month	13.08	0.65	a	16.24	0.86	a	4.42	0.10	a	2.60	0.20	b	2.64	0.12	b
	6 months	3.49	0.47	e	4.87	0.64	e	−2.10	0.04	b	−4.57	0.11	e	−4.34	0.05	e

Different letters denote significant differences among the specimens within each 3D printable material (p < 0.05).