Table 5.

RMS measurements of the CBCT model and crown-root fusion model compared to the laser model

Voxel size (mm)	Thresholds (HU)	Mean RMS ± SD(mm)
		CBCT model	Crown-root fusion model	P-value
0.3 mm	800	0.2408 ± 0.0210	0.0945 ± 0.0207	0.00
	1000	0.2091 ± 0.0227	0.0787 ± 0.0183	0.00
	1200	0.1781 ± 0.0156	0.0677 ± 0.0185	0.00
	1400	0.1502 ± 0.0132	0.0595 ± 0.0149	0.00
	1600	0.1269 ± 0.0125	0.0467 ± 0.0141	0.00
0.15 mm	800	0.1430 ± 0.0141	0.0749 ± 0.0130	0.00
	1000	0.1170 ± 0.0100	0.0610 ± 0.0097	0.00
	1200	0.0952 ± 0.0086	0.0471 ± 0.0101	0.00
	1400	0.0773 ± 0.0074	0.0407 ± 0.0092	0.00
	1600	0.0691 ± 0.008	0.0359 ± 0.009	0.00

(P-value: RMS of CBCT model vs. RMS of crown-root fusion model)