Author: Tezel H, Ertas OS, Erakin C, Kayali A.

Source: Br Dent J.

Year: 2001

Comment:

The researchers conclude, "This study showed that dentists and dental students are affected by mercury vapour existing in their clinics and laboratories. Considering these findings we conclude that close attention should be given to mercury hygiene in laboratories and clinics including good ventilation, control of waste mercury chains and enhanced care in handling."

Abstract / Excerpt:

“OBJECTIVE:

To determine the blood mercury levels in dental students and clinical teaching staff in a dental school using amalgam as a restorative material.

SETTING:

A dental school in Ege University, Turkey surveyed during one academic year.

SUBJECTS AND METHODS:

Cross-sectional study of groups of dental students (n=92) in years I to V, clinical teachers in restorative dentistry (n=16) and controls (n=14). Mercury concentration was estimated in venous blood samples using a cold vapour atomic absorption method at the commencement and end of the academic year. Daily air mercury levels were determined in clinical and teaching areas by measuring the darkening of palladium chloride discs using spectrophotometry.

RESULTS:

There were statistically significant increases (p<0.001) in plasma mercury concentration between measurements in all groups at the end of the academic year. Red cell mercury levels were also consistently elevated. Although the highest levels of mercury were recorded in persons working with amalgam, increased levels were also found in subjects working in the teaching classrooms but not with amalgam (controls and first year students).

CONCLUSION:

Increased mercury levels appeared to be due to background exposure from spillage of mercury and amalgam residues on floors. Increased mercury hygiene and regular control of working atmosphere should be implemented to prevent mercury exposure in the dental pre-clinical laboratory.”

Citation:

Tezel H, Ertas OS, Erakin C, Kayali A. Blood mercury levels of dental students and dentists at a dental school. Br Dent J. 2001; 191(8):449-52.