Dimensional stability of two impression materials after a 6-month storage period

Figures & data

Figure 1. Block test and ring mold made according to ISO 4823:2000.

Figure 2. Superior view of the block test. Lines 1 and 2 have a width of 50 and 20 microns, respectively. Lines 3, 4 and 5 have a width of 75.

Figure 3. Descriptive statistics of PE and VPS groups with mean values and standard deviation at T0 and T1 time level.

Table 1. Descriptive and three-way ANOVA analysis between the three variables.

	T0 (Mean % ± SD)	T1 (Mean % ± SD)	Shrinkage (Mean % ± SD)	p
PE
Control	0.13 ± 0.19	0.90 ± 0.26^d^,e	0.77 ± 0.17	p < .05^b^(*)
Hypochlorite	0.22 ± 0.19	0.64 ± 023^c	0.42 ± 0.19
Autoclave	0.30 ± 0.30	0.83 ± 0.32	0.52 ± 0.28
VPS
Control	0.12 ± 0.18	0.53 ± 0.19^c	0.42 ± 0.12	p < .05^b^(*)
Hypochlorite	0.16 ± 0.22	0.52 ± 0.24^c	0.36 ± 0.09
Autoclave	0.30 ± 0.12	0.87 ± 0.13	0.58 ± 0.13
	p = .794^a	p < .025^a^,^#

* Identifies a statistically significant differences, for a 95% confidence level.

# Identifies a statistically significant interaction, for a 95% confidence level.

^a Three-way mixed ANOVA – between-subjects effects.

^b Three-way mixed ANOVA – within-subjects effects.

^c Statistically significant differences with autoclave group – pairwise comparisons.

^d Statistically significant differences with hypochlorite group – pairwise comparisons.

^e Statistically significant differences with VPS material – pairwise comparisons.