No Memory Effects From Dental Amalgams

J Dent. 2003 Sep;31(7):487-92.
Memory functions in persons with dental amalgam.
Dalen K, Lygre GB, Klove H, Gjerdet NR, Askevold E.
Department of Clinical Neuropsychology, University of
Bergen, Jonas Liesvei 91, N-5009, Bergen, Norway.

Memory and psychophysiological variables in persons
with self-reported reactions to dental amalgam (amalgam
patients: N=26) and in persons without such symptoms
(controls: N=21) were compared. The groups were
matched regarding age, education, and amount of amalgam.
Wechsler Memory Scale-Revised was obtained for all
subjects and compared to amalgam points in a
dose-response design. The results demonstrated that
amalgam patients function on the same level as the controls
regarding memory variables, attention, concentration, and
delayed recall. Psychophysiological measures of skin
conductance as correlates of attention and basal memory
functions, were compared in the two groups. No differences
between the two groups were observed and no correlation
between memory variables and exposure to amalgam could
be detected.