Physical Properties of Polyamide-12 versus PMMA Denture Base Material

Table 1

Color changes Δ𝐸 in polyamide-12 and PMMA after storage in air, water, coffee, and red wine (𝑛=10).

Material	Storage medium	Storage time (days)	Mean ΔE	SE	Min	Max
Polyamide-12	Air	1	2.26	0.13	1.80	3.02
		12	2.01	0.06	1.67	2.26
		36	2.29	0.09	1.89	2.89
	Water	1	2.90	0.20	2.15	3.92
		12	2.23	0.10	1.84	2.84
		36	2.18	0.08	1.79	2.62
	Coffee	1	1.59^#	0.08	1.20	1.98
		12	2.04^##	0.19	1.35	3.51
		36	3.93 ^#,##	0.29	2.35	5.30
	Red wine	1	2.40^*,**	0.23	1.39	3.54
		12	𝟒.𝟐𝟕^∗	0.11	3.66	4.76
		36	𝟔.𝟗𝟎^∗∗	0.26	5.36	8.49
PMMA	Air	1	2.44	0.12	1.93	3.14
		12	2.06	0.05	1.84	2.35
		36	1.94	0.06	1.83	2.48
	Water	1	2.79	0.15	2.1	3.47
		12	2.67	0.15	2.05	3.56
		36	2.22	0.09	1.99	2.79
	Coffee	1	2.05	0.12	1.62	2.74
		12	2.02	0.18	1.52	3.46
		36	1.60	0.12	1.30	2.59
	Red wine	1	2.87	0.22	2.09	4.28
		12	2.76	0.18	2.22	3.82
		36	2.48	0.33	1.77	5.17

Appreciable color changes (Δ𝐸>3.3) in bold letters. Significant differences are indicated by ^#,##(coffee), ^*,**(red wine).