Table VI.

Skull landmarks: comparison of differences between two-dimensional and three-dimensional measurements of gonion-mental foramen (G-MF) and condylion-gonion (C-G) distances for 25 skulls imaged in 3 positions

Landmarks	Skull side	Measurement	Difference*		Absolute value of difference†
			2D	3D	2D	3D
G-MF	Left	Mean error (mm)	1.66	1.26	1.77	1.37
		% error	3.0%	2.3%	3.2%	2.5%
		SD	(1.78)	(1.28)	(1.68)	(1.15)
	Right	Mean error (mm)	0.26	0.13	0.97	0.96
		% error	0.5%	0.2%	1.7%	1.7%
		SD	(1.34)	(1.33)	(0.95)	(0.92)
C-G	Left	Mean error (mm)	−2.1	−1.89	2.12	1.94
		% error	−3.7%	−3.4%	3.8%	3.5%
		SD	(1.24)	(1.27)	(1.21)	(1.19)
	Right	Mean error (mm)	−1.13	−0.96	1.3	1.21
		% error	−2.0%	−1.7%	2.3%	2.2%
		SD	(1.05)	(1.13)	(0.83)	(0.84)

G-MF, gonion-mental foramen; C-G, condylion-gonion.

^*Average of 75 measurements (measurement in image–skull length).

^†Average of 75 measurements |measurement in image–skull length|.