Table 1.

Some reported values for background concentrations of zinc in saliva and plaque, with standard deviations in brackets (except * where ranges are quoted). Values for ‘dry’ plaque have been reduced sevenfold to facilitate comparison41., 42., 43.

Authors	Salivary Zn conc/ppm	Authors	Plaque Zn conc/ppm
Kim et al.	0.0135 (0.0122)	Schafer et al.	15.2 (13.0)
Burguera-Pascu et al.	0.055 (0.017)	Hall et al.	31.6 (4.70)
Menegário et al.	0.127 (0.0744)	Günbay et al.	6.41 (0.687)
Watanabe et al.	0.080 (0.043)	Creeth et al.	19.5 (2.70)
Özdemir et al.	0.17 (0.176)	Dobl et al.	18.6 (11.2) 17.9 (10.6)
Kuraner et al.	0.112 (0.048)	Gilbert and Ingram	< 40
Gilbert et al., Gilbert and Ingram	< 0.200	Saxton et al.	15.9 (pooled sample)
Sighinolfi et al.	0.0465 (0.0152)	Harrap et al.	17.4 (5.86)
Tan-Walker and Gilbert	0.150 (0.06) 0.190 (0.06)	Afseth et al.	7.86 (2.29)
Harrap et al.	0.244 (0.0883)	Afseth J.	< 10.7
Klinger et al.	0.0654 (0.0418-0.0100)* 0.079 (0.0347-0.178)*	Schamschula et al.	17.1 (12.3)
Henkin et al.	0.051 (0.014)	Schamschula et al	13.4 (7.46) – 15.5 (6.71)