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

Table 8 Heavy metal concentrations (μg/g) in the samples from people with different levels of education living in Bielsko-Biala

	Impacted teeth (n = 33)						Bone surrounding the impacted teeth (n = 33)
	Educational level						Educational level
Element	Primary (n = 7) Median	Vocational (n = 11) Median	Secondary (n = 9) Median	Higher (n = 6) Median	H-value	p - level^*	Primary (n = 7) Median	Vocational (n = 11) Median	Secondary (n = 9) Median	Higher (n = 6) Median	H-value	p - level^*
Pb	14.08	13.20	12.02	11.70	5.126	0.162	3.44	3.81	4.54	4.11	3.460	0.326
Cd	0.12	0.11	0.12	0.10	2.109	0.549	0.34	0.65	0.84	0.67	13.959	0.096
Fe	8.72	9.92	8.79	11.94	7.660	0.536	13.44	13.16	12.05	16.70	8.352	0.046
Mn	3.26	3.89	3.19	3.73	6.063	0.109	0.86	1.22	1.59	1.52	2.054	0.561
Cr	5.95	5.39	4.72	4.54	2.956	0.398	0.86	1.45	1.96	1.12	4.016	0.259
Cu	8.25	8.86	8.86	9.16	2.208	0.530	6.93	7.09	8.52	4.76	2.025	0.567
Zn	328.10	263.94	282.67	293.94	6.303	0.097	101.80	172.83	162.60	165.19	11.124	0.091

n number of samples
^* p-levels, estimated using the ANOVA Kruskal–Wallis test, used to identify statistically significant differences between the metal concentrations in the samples provided by people with different levels of education living in Bielsko-Biala

ISSN: 1745-6673