Table 2. Distance (mm) between the corresponding physiological foramina and anatomical root apex of maxillary and mandibular first and second molars.

1st MX	MB (S)	MB (2)	MB (3)	DB (S)	DB (2)	P (S)
Mean	0.82	0.84	0.93	0.81	0.8	1.02
s.d.	0.28	0.30	0.36	0.26	0.26	0.33
Max	1.63	1.74	2.3	1.49	1.49	2.10
Min	0.27	0.17	0.23	0.22	0.22	0.42
2nd MX	MB (S)	MB (2)	MB (3)	DB (S)	DB (2)	P (S)	P (2)
Mean	0.54	0.50	0.55	0.43	0.43	0.63	0.62
s.d.	0.28	0.10	0.22	0.21	0.16	0.32	0.10
Max	1.56	1.56	1.25	1.17	1.17	1.72	1.72
Min	0.19	0.15	0.14	0.08	0.08	0.09	0.09
1st MA	M (S)	M (2)	M (3–5)	D (S)	D (2)	D (3–4)
Mean	0.95	0.97	0.95	1.05	1.01	1.06
s.d.	0.29	0.25	0.22	0.24	0.41	0.27
Max	1.98	1.98	1.76	1.91	2.63	2.52
Min	0.54	0.57	0.54	0.59	0.56	0.59
2nd MA	M (S)	M (2)	M (3–4)	D (S)	D (2)	D (3)
Mean	0.78	0.73	0.70	0.81	0.60	0.81
s.d.	0.37	0.32	0.32	0.34	0.23	0.34
Max	1.86	1.86	2.13	1.71	0.96	1.71
Min	0.24	0.24	0.35	0.28	0.19	0.28

1st, first; 2, two foramina; 2nd, second; 3, three foramina; 3–5, three, four or five foramina; 3–4, three or four foramina; D, distal; DB, distobuccal; M, mesial; MA, mandibular; Max, maximum; MB, mesiobuccal; Min, minimum; MX, maxillary; P, palatal; S, single foramen; s.d., standard deviations.