Bulletin of the National Research Centre

Table 1 Mean and Standard Deviation for Polyamides and PMMA

From: Impact of popular beverages on polyamides versus polymethyl methacrylate denture base materials colour stability: in vitro study

Variable	Effect of time	Tea Mean ± SD	Cola Mean ± SD	Coffee Mean ± SD	Distilled Water	P-Value
Polyamides	7 Days	5.92 ± 0.34	4.37 ± 0.41	4.01 ± 0.29	1.38 ± 0.27	< 0.00001*
Polyamides	30 Days	6.72 ± 0.29	5.07 ± 0.34	6.12 ± 0.18	2.01 ± 0.23	< 0.00001*
PMMA	7 Days	3.75 ± 0.27	2.91 ± 0.22	3.11 ± 0.20	0.93 ± 0.21	< 0.00001*
PMMA	30 Days	5.23 ± 0.24	3.42 ± 0.17	4.23 ± 0.15	1.17 ± 0.19	< 0.00001*

* indicates significant values

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