Biomedical subjects

D Brune

Publications and source records attributed to D Brune.

At least 91 records · Page 5Linked to original sources

PubMed1979

Elements in minor or trace quantities in zinc phosphate cements.

Eight powders and two liquids of zinc phosphate cements have been analyzed by optical emission spectrography for the purpose of characterizing elements in minor or trace quantities. The following elements were measured: bismuth, boron, cadmium, chromium, copper, iron, lead, silver and titanium. The content of any of these elements did not exceed the level of 0.1%. The amounts of such elements which might be transferred to the gastrointestinal tract associated with dissolution from unsuccessful restorations have been considered.

Digestive System↗

PubMed1979

Levels of mercury and silver in dust from the trimming of amalgam dies.

The levels of mercury and silver in dust arising from the trimming, i.e. grinding, of amalgam dies in dental laboratories have been measured. In breathing air close to the workpiece, the mercury and silver contents exceeded the threshold limit values for short-term exposure by factors of aboit 60 and 400 in cases when local ventilation was not in use. With efficient local exhaust systems enabling a dust reduction of about 94%, the short-term exposure limit values for mercury and silver were exceeded by factors of about 4 and 20 respectively. Mercury and silver were assayed quantitatively by means of nuclear chemical analysis. A major part of the amalgam dust consisted of respirable particles. The collected dust comprised about 80% amalgam and 20% particulate matter from grinding wheels and stones according to SEM and EDAX measurements.

Air Pollutants↗

PubMed1979

Toxic elements in silicate cements.

Six brands of silicate cements have been characterized by means of optical emission spectrography with respect to the contents of elements in minor or trace quantities in a search for presence of possible toxic elements. Beryllium was observed in two powders at levels of 1.3 and 1.6% Cadmium was found in two powders at levels of 0.02 and 0.03%. Lead was measured in three powders at levels of 0.001-0.003%. Bismuth, boron, copper, gallium, iron, manganese, titanium, tin and zirconium were found in various brands in either powder or liquid at levels of 0.001-0.1%. Upper limits of the amounts of the various elements that might be transferred to the gastrointestinal tract after dissolution of the cement matrix in the oral cavity have been calculated.

Beryllium↗

PubMed1978

Microprobe analysis of lead in human femur by proton induced X-ray emission (PIXE).

A method is described for the measurement of the distribution of lead in bone tissue. Two cases of human femur have been analyzed; one worker was exposed to lead in heavy metal industry, the other case presents a reference worker from the same environment not excessively exposed to lead. Lead was determined through proton induced X-ray emission using microprobe technique. The mean lead concentration in the poisoned and the reference case was 70 and 30 ppm, respectively. The reference case showed an even lead distribution in the femur, while the poisoned case exhibited peaks in the distribution indicating that exposure to lead was not evenly distributed. The described technique has potential for microanalysis within the Haversian system for recording the history of exposure.

Bone and Bones↗

PubMed1978

Mercury vapor levels in a dental laboratory.

Mercury vapor levels associated with grinding amalgam models and mulling amalgams in the palm of the hand following trituration have been measured in a dental laboratory in inhalation position. The threshold limit value of airborne mercury of 0.05 mg/m3 was essentially exceeded in the grinding procedure of amalgam. Levels in excess of seven times this value were recorded. During mulling the mercury vapor level fluctuated around the threshold limit value. The mean mercury concentrations did not essentially exceed the threshold limit value.

Air Pollutants↗

PubMed1978

Levels of airborne particles resulting from handling alginate impression material.

The levels of airborne particles emanating from handling alginate impression powders have been surveyed. The concentrations of powders, lead and silicious particles in the aerosol have been measured after thoroughly shaking the containers before opening. The decrease of the powder concentration in the ambient air as a function of time has been estimated. The efficiency of face masks to protect against powder exposure has been investigated.

Aerosols↗

PubMed1977