The Trembling Edge of Science Dimethyl mercury Dartmouth accident Federal bill banning use of dental mercury Dr Boyd Haley Unmasking The Unscientific JAMA  CHILDRENS AMALGAM STUDY  Melisa Test  Andy Hall Cutler book Biopobe Bio Probe News   DAMS  Jeff Clarks site The International Academy of Oral Medicine  Toxicology IAOMT Raymond Singer Raymond Singer PhD  Alondra Road Santa Fe New Mexico  Phone   Fax        Home Page httpwwwneurotoxcom Email raysinger at aolcom  Website httprtctoxcomsingerhtm   The following is an abstract of a paper presented  by RAYMOND SINGER PHD  Singer R    Neuropsychological assessment of a practicing dentist with elevated urinary mercury  Fundamental and Applied Toxicology  Supplement The Toxicologist   March    NEUROPSYCHOLOGICAL ASSESSMENT OF A PRACTICING DENTIST WITH ELEVATED URINARY MERCURY   R Singer Santa Fe   New Mexico USA   Dentists are exposed to mercury from amalgam composed of  mercury  copper  silver used as implants for dental restoration   A recent study of  of Singapores dentists found mercury  doserelated neuropsychological deficits when compared with controls   The current subject a dentist practicing for  years in the USA was referred by his physician for neurobehavioral examination   The subject presented with symptoms including fatigue GI problems sweats tremors rashes bowel dyscontrol and heart arrhythmia   Tremors of the hand and eyelid affect the subjects hand stability while working   Results of the Neurotoxicity Screening Survey showed a profile of symptoms consistent with neurotoxicity  Urine sampling  h over the past year found    ppb mercury averaging  ppb expected range   ppb atomic fluorescence spectrometry   High readings may be related with chelation therapy   Current IQ was at the    percentile  or greater estimated premorbidly consistent with his presentation as an intelligent competent dentist  In contrast to a relatively high IQ appropriate neuropsychological testing revealed that the subject  has deficits in immediate memory   visuospatial perception  visual memory visual figureground perception  verbal learning  mental flexibility  attentional processes  logical memory p   and nonverbal recognition memory    Neuropsychological testing helped confirm mercury toxicity affecting multiple organ systems  Such deficits impact the subjects ability to practice dentistry and raises questions as to effects of mercury in other dentists as well as possible