Evaluation of Threshold Values for Root Canal Filling Voids in Micro-CT and Nano-CT Images

Table 1

Mean percentage (and standard deviations) of section with voids, volume of root filling material, and percentage of internal, external, and combined voids in micro-CT and nano-CT images for each voxel size.

Voxel size (μm)	Section with voids (%)	Filling material (%)	Internal voids (%)	External voids (%)	Combined voids (%)
1.5	79.4 (34.2)	97.3 (1.3)	0.73 (0.2)	0.842 (0.6)	0.983 (0.4)
5.0	78.7 (38.5)	97.6 (1.4)	0.72 (0.2)	0.731 (0.5)	0.920 (0.5)
5.2	78.3 (38.8)	97.6 (1.3)	0.70 (0.2)	0.722 (0.5)	0.928 (0.4)
8.1	77.6 (34.7)	97.7 (1.3)	0.69 (0.2)	0.702 (0.6)	0.812 (0.5)
11.2	73.2 (33.4)	98.0 (1.3)	0.67 (0.2)	0.601 (0.6)	0.693 (0.5)
16.73	70.2 (36.5)	98.8 (1.4)	0.54 (0.2)	0.325 (0.5)	0.318 (0.5)

Different letters indicate statistical difference between voxel size groups according to Kruskal-Wallis test and post hoc Mann–Whitney test.