Table 2.

Comparison of virtual properties of obturator bulbs designed via Sets A, B and C.

Mesh surface area (MSA)
	Mean (mm2)	SD	F-stat (df)	P valuea
Set A	1516.93	405.25	0.34 (2)	0.72
Set B	1426.20	410.43
Set C	1417.82	392.42

Virtual volume (VV)
	Mean (mm3)	SD	F-stat (df)	P valuea
Set A	2744.47	1317.68	1.18 (2)	0.32
Set B	3331.73	1458.93
Set C	3158.38	1444.37

Hausdorff’s distance
	Mean (mm)	SD	t-stat (df)	P valueb
Set B	0.55	0.40	− 0.81 (34)	0.42
Set C	0.65	0.38

Spatial overlap by dice similarity coefficient
	Mean	SD	t-stat (df)	P valueb
Set B	0.82	0.09	0.60 (34)	0.55
Set C	0.80	0.09

^aOne-way ANOVA, 3 equal groups (total n=54). P value set at 0.05. Kolmogorov–Smirnov test for MSA and VV is not significant (P > 0.05) for all groups. Data is normally distributed.

^bIndependent t-test, P value set at 0.05. All parameters for normal distribution met. Kolmogorov–Smirnov and Shapiro–Wilk tests not significant (P > 0.05). Levene test for HD and DSC were 0.593 and 0.994, respectively. HD and DSC were obtained by taking Set A as comparison reference.