Table 2.

Two-dimensional and three-dimensional enamel thickness measurements (mean) in fossil hominins and recent hominoids (ordered on three-dimensional relative enamel thickness).

	H. sapiensa	P. robustus	A. africanus	H. neanderthalenisb	Hylobates muelleric,d	Pongo pygmaeusc,e	Pan troglodytesc,e	Symphalangus syndactylusc,d	Gorilla gorillac,e
three-dimensional sample size	39	9	9	29	11	12	26	17	9
enamel volume (mm3)	218.91	557.51	478.85	225.47	26.37	197.91	137.00	62.29	372.01
dentine volume (mm3)	226.83	507.60	598.90	345.65	36.88	336.05	166.05	119.60	1023.18
EDJ surface area (mm3)	162.56	311.80	332.67	211.60	53.80	199.75	182.67	116.21	375.89
three-dimensional AET (mm)	1.43	1.83	1.48	1.08	0.49	1.01	0.75	0.55	0.98
three-dimensional RET	23.97	23.27	17.70	15.55	14.72	14.49	11.80	11.15	9.77
Two-dimensional sample size	257	9	9	42	11	41	40	17	15
Enamel area (mm2)	24.19	44.75	36.20	21.97	4.44	23.42	14.63	7.30	29.37
dentine area (mm2)	38.73	53.23	52.27	41.65	8.47	50.93	36.95	18.50	79.29
EDJ length (mm)	19.60	21.87	22.42	20.75	10.13	21.34	19.47	13.53	28.25
two-dimensional AET (mm)	1.22	2.03	1.63	1.06	0.44	1.10	0.75	0.54	1.04
two-dimensional RET	20.06	28.38	22.79	16.44	15.27	15.49	13.23	12.58	11.68

^aTwo-dimensional data from Smith et al. (2006).

^bData from Olejniczak et al. (2008c).

^cThree-dimensional data from Olejniczak et al. (2008b).

^dTwo-dimensional data from A. J. Olejniczak (2006, unpublished Ph.D. dissertation).

^eTwo-dimensional data from Smith et al. (2005).