Selected toxic and essential heavy metals in impacted teeth and the surrounding mandibular bones of people exposed to heavy metals in the environment

Table 6 Heavy metal concentrations (μg/g) in the samples from people living different distances from the centre of Bielsko-Biala

	Impacted teeth (n = 33)				Bone surrounding the impacted teeth (n = 33)
Element	6-10 km (n = 21) Median	10-14 km (n = 12) Median	U-value	p - level^*	6-10 km (n = 21) Median	10-14 km (n = 12) Median	U-value	p - level^*
Pb	10.79	10.03	125.50	0.125	3.74	4.36	88	0.160
Cd	0.10	0.11	87.00	0.149	0.62	0.77	85	0.129
Fe	11.32	8.98	81.50	0.099	14.52	13.53	101	0.359
Mn	3.45	3.42	104.00	0.421	1.14	1.69	98	0.312
Cr	4.68	5.39	100.50	0.349	1.29	1.49	104	0.421
Cu	8.79	8.86	113.50	0.653	7.09	5.91	125	0.985
Zn	293.94	294.23	98.50	0.312	170.71	156.67	125	0.985

n number of samples
^* p-levels, estimated using the Mann–Whitney U test, used to identify statistically significant differences between the metal concentrations in the samples provided by people living different distances from the centre of Bielsko-Biala

ISSN: 1745-6673