Table 1.

Discrepancies (Mean ± SD, in μm) of stone dies obtained from the different impression materials and techniques. Homogeneous grouping determined by Tukey multiple comparison test (α = 0.05). Positive discrepancies indicate that the dies were larger, while negative discrepancies indicate that the dies were smaller, when compared to the original stainless steel die.

Group (n = 10)	Mean (μm) ± SD	Homogeneous grouping*
Perfectim single-step	79.40 ± 14.11	a
Impregum single-step	63.52 ± 16.60	a
Perfectim 2-step	−201.86 ± 28.58	b
Impregum 2-step	−290.94 ± 71.64	c

*Mean values followed by different letters correspond to significant differences.