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Dental amalgam revised.

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Clinical Trials as Topic↗
PubMed1989

An epidemiologic study of the relation between symptoms of fatigue, dental amalgam and other factors.

Fatigue has been described as a symptom of mercury toxicity. The aim of this pilot study was to investigate whether fatigue is related to the number of tooth surfaces of amalgam or to other factors. The study population was a group of 108 hospital workers who completed a self administered questionnaire including questions about fatigue in a study (1983) to determine the effects of exposure to glutaraldehyde. The 39 women who gave positive answers to one or two of the questions about fatigue were assigned cases. The referents were chosen with regard to sex, age and smoking habits among those who gave negative answers to both questions. Information about the number of surfaces of amalgam was received from dentists. Analysis showed that the cases and referents were not significantly different in terms of the mean number of surfaces of amalgam. There was a significant positive relation between the number of surfaces of amalgam and age as well as smoking habits. A significant positive relation was also found between symptoms of fatigue and psychosocial factors and the frequency of sick-leave in respiratory diseases. In conclusion other factors rather than the release of mercury from dental amalgam could explain the symptoms of fatigue.

Adult↗
PubMed1995

People with high mercury uptake from their own dental amalgam fillings.

OBJECTIVES: To describe people with high mercury (Hg) uptake from their amalgam fillings, and to estimate the possible fraction of the occupationally unexposed Swedish population with high excretion of urinary Hg. METHODS: Three case reports are presented. The distribution of excretion of urinary Hg in the general population was examined in pooled data from several sources. RESULTS: The three cases excreted 23-60 micrograms of Hg/day (25-54 micrograms/g creatinine), indicating daily uptake of Hg as high as 100 micrograms. Blood Hg was 12-23 micrograms/l, which is five to 10 times the average in the general population. No other sources of exposure were found, and removal of the amalgam fillings resulted in normal Hg concentrations. Chewing gum and bruxism were the probable reasons for the increased Hg uptake. Extrapolations from data on urinary Hg in the general population indicate that the number of people with urinary excretion of > or = 50 micrograms/g creatinine could in fact be larger than the number of workers with equivalent exposure from occupational sources. CONCLUSION: Although the average daily Hg uptake from dental amalgam fillings is low, there is a considerable variation between people; certain people have a high mercury uptake from their amalgam fillings.

Adult↗
PubMed1986

Fracture toughness determination of dental amalgams through microindentation.

A microindentation technique was used to study and estimate the fracture toughness of six amalgams. A significant difference is observed between fracture toughness at the bulk and the margin of amalgams. All amalgams show significant differences in fracture toughness as a function of distance from the margin. Microindentation measurement of fracture toughness appears to be an effective method of evaluating the localized brittleness of amalgams.

Dental Alloys↗