A PILOT-STUDY OF THE EFFECT OF LOW-LEVEL EXPOSURE TO MERCURY ON THE HEALTH OF DENTAL SURGEONS

Objectives-This project was conducted to examine whether the computeri sed analysis of psychomotor responses available from Cognitive Drug Re search is appropriate for measuring an effect of low level exposure to mercury in dentists. Methods-A computerised battery of psychomotor te sts was given to two groups of dentists (older dentists and trainees) and to two age matched control groups. As well as the psychomotor test s, volunteers were required to complete a questionnaire to identify po tential influences on psychomotor performance and to provide a sample for analysis of urinary mercury. Results-Statistical analysis of the r esults showed that the older dentists had slightly higher concentratio ns of urinary mercury although most were around background levels and they were all within occupational limits. Five of the psychomotor test s showed no differences between the performance of the four groups. Th e older dentists showed significantly better performance on the simple reaction time test and significantly poorer performance in the immedi ate word recall and delayed word recall tests. Conclusions-Poorer perf ormance in memory recall tests confirms previously reported studies. T his together with the confirmation that this test system is a practica l tool in the occupational setting suggests that a larger study of the effects of mercury exposure on dentists would be appropriate.