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

Table 2

Mean volumes (and standard deviations) of the root canal filling voids in different voxel sizes according to the apical, middle, and coronal thirds.

	Voxel size (μm)	Apical	Middle	Cervical
Nano-CT	1.5	0.765 (0.3)	0.825 (0.3)	1.065 (0.5)
	5.0	0.759 (0.3)	0.774 (0.2)	0.833 (0.3)
Micro-CT	5.2	0.752 (0.3)	0.77 (0.3)	0.803 (0.5)
	8.1	0.563 (0.2)	0.744 (0.3)	0.747 (0.4)
	11.2	0.575 (0.2)	0.694 (0.3)	0.715 (0.5)
	16.73	0.295 (0.4)	0.353 (0.4)	0.535 (0.9)

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