. 2013 Feb 4;11(1):23–28. doi: 10.1016/j.jds.2012.11.002

Table 2.

The surface roughness of gypsum models made by different impression materials and gypsum products (μm) at different storage times.

Materials	(1) Algiace	(2) Cavex	(3) Jeltrate	(4) Aquasil	(5) Coltexfine	(6) Exaflex	(7) Take 1Wash	Bonferroni's test
storage time
MG crystal rock	Mean ± SD
5 min	5.01 ± 0.97	4.76 ± 1.28	4.60 ± 0.31	1.89 ± 0.50	2.44 ± 0.63	1.91 ± 0.42	2.01 ± 0.59	1,2,3 > 4,5,6,7
1 h	5.46 ± 1.45	5.11 ± 0.53	4.35 ± 1.34	1.52 ± 0.33	2.03 ± 0.28	1.86 ± 0.23	1.95 ± 0.21	1,2,3 > 4,5,6,7
1 d	5.87 ± 0.40	6.64 ± 0.70	4.21 ± 0.68	2.08 ± 0.07	2.10 ± 0.14	2.31 ± 0.61	1.96 ± 0.34	1,2,3 > 4,5,6,7
1 d	5.87 ± 0.40	6.64 ± 0.70	4.21 ± 0.68	2.08 ± 0.07	2.10 ± 0.14	2.31 ± 0.61	1.96 ± 0.34	2 > 1,3
t test	NS	1 < 3	NS	NS	NS	NS	NS
Super hard stone	Mean ± SD
5 min	7.420.66	7.33 ± 1.22	6.26 ± 1.34	2.44 ± 0.49	1.90 ± 0.26	2.1 ± 0.11	2.04 ± 0.46	1,2,3 > 4,5,6,7
1 h	5.62 ± 0.87	7.25 ± 0.60	5.21 ± 0.89	2.29 ± 0.49	1.78 ± 0.49	2.22 ± 0.13	1.82 ± 0.30	1,2,3 > 4,5,6,7
1 h	5.62 ± 0.87	7.25 ± 0.60	5.21 ± 0.89	2.29 ± 0.49	1.78 ± 0.49	2.22 ± 0.13	1.82 ± 0.30	2 > 1,3
1 d	6.96 ± 0.97	6.38 ± 0.66	6.35 ± 1.48	1.86 ± 0.13	1.73 ± 0.38	2.05 ± 0.23	1.96 ± 0.34	1,2,3 > 4,5,6,7
t test	1 > 2	NS	NS	1 > 3	NS	NS	NS
MS plaster	Mean ± SD
5 min	3.18 ± 0.68	3.65 ± 0.68	2.72 ± 0.45	2.16 ± 0.52	2.28 ± 0.51	2.46 ± 0.16	2.10 ± 0.36	1 > 7
5 min	3.18 ± 0.68	3.65 ± 0.68	2.72 ± 0.45	2.16 ± 0.52	2.28 ± 0.51	2.46 ± 0.16	2.10 ± 0.36	2 > 4,5,6,7
1 h	4.54 ± 0.63	4.96 ± 0.72	3.26 ± 0.19	2.46 ± 0.28	2.34 ± 0.28	2.70 ± 0.35	2.07 ± 0.17	1,2 > 3,4,5,6,7
1 h	4.54 ± 0.63	4.96 ± 0.72	3.26 ± 0.19	2.46 ± 0.28	2.34 ± 0.28	2.70 ± 0.35	2.07 ± 0.17	3 > 5,7
1 d	2.82 ± 0.53	3.64 ± 0.50	3.29 ± 0.78	1.86 ± 0.19	2.11 ± 0.08	2.37 ± 0.24	2.75 ± 0.44	1,2 > 4,5,6
1 d	2.82 ± 0.53	3.64 ± 0.50	3.29 ± 0.78	1.86 ± 0.19	2.11 ± 0.08	2.37 ± 0.24	2.75 ± 0.44	3 > 4,5
t test	2 > 1,3	2 > 1,3	NS	NS	NS	NS	1,2 < 3

Bonferroni's test was performed for pair-wise comparisons after F test in one-way ANOVA, which was used to test the effect of materials on the surface roughness for each subgroup stratified by gypsum products and storage time; P-values for all F tests were <0.05. The t tests were performed to do all pair-wise comparisons of roughness among different time points from one-way within-effect mixed model after Bonferroni's adjustment. 1 < 3 indicated the mean of Algiace (1) was significantly less than that of Jeltrate (3). 1,2,3 > 4,5,6,7 indicates 1 > 4, 1 > 5, 1 > 6, 1 > 7 ; 2 > 4, 2 > 5, 2 > 6, 2 > 7 ;3 > 4, 3 > 5, 3 > 6 and 3 > 7. NS = not significant.