Table 6.

Multiple pairwise comparisons of the accuracy of the articulated casts by the 3 impression materials and 3D printed system using Tukey’s HSD test.

	Pairwise comparison	Mean (SD)	Mean difference	P value#
Anterior vertical	AL(C)	0.22 (0.12)	0.08	0.181
	AL(E)	0.14 (0.12)
	AL(C)	0.22 (0.12)	0.09	0.693
	AL(F)	0.13 (0.09)
	AL(C)	0.22 (0.12)	−0.16	0.157
	3DC	0.38 (0.33)
	AL(E)	0.14 (0.12)	−0.01	0.765
	AL(F)	0.13 (0.09)
	AL(E)	0.14 (0.12)	−0.24	0.001**
	3DC	0.38 (0.33)
	AL(F)	0.13 (0.09)	−.25	0.013*
	3DC	0.38 (0.33)
Posterior vertical	AL(C)	0.38 (0.25)	0.15	0.152
	AL(E)	0.23 (0.12)
	AL(C)	0.38 (0.25)	0.16	0.071
	AL(F)	0.22 (0.20)
	AL(C)	0.38 (0.25)	−0.18	0.377
	3DC	0.56 (0.26)
	AL(E)	0.23 (0.12)	0.01	0.983
	AL(F)	0.22 (0.20)
	AL(E)	0.23 (0.12)	−0.33	0.003**
	3DC	0.56 (0.26)
	AL(F)	0.22 (0.20)	−0.34	0.001**
	3DC	0.56 (0.26)

AL(C) – conventional alginate; AL(E) – extended pour alginate; AL(F) – alginate free; 3D-C – three-dimensional printed cast; df – degree of freedom; CI – confidence interval.

^#Tukey’s HSD Test. Levels of significance: NS (not-significant)=P≥0.05;

^*Significant=P≤0.05;

^**Very significant=P≤0.01;

^***Highly significant=P≤0.001.