Mercury release from dental amalgam into saliva

Kari Uusheimo, Inkeri Rytömaa

Research output: Book/ReportReport

1 Citation (Scopus)

Abstract

The purpose of the present study was to determine the quantity of mercury released into saliva from dental amalgan. Five fillings made from an amalgam labeled by 203Hg-isotope were prepared in plastic cases. The fillings were kept in the saliva at the body temperature (37 ± 3 °C). The saliva was changed first after a 24-hour period, then every second day, later weekly and finally once in a month. The count rate of the released Beta-/gamma-active isotope was measured by means of a liquid scintillation counter. The effect of polishing on the release of mercury was also studied. To this end three of the fillings were polished one week and again four weeks after the insertion. Two unpolished fillings were used as controls. The results from the polished and unpolished fillings differed clearly from each other. Following the polishing day a many fold amount of mercury was released from the polished fillings compared with the unpolished fillings. This difference, however, disappeared after one or at the latest after two days from the polishing. Interestingly over a long time period, more mercury was released from the unpolished than from the polished fillings. Exceptionally high mercury values were occasionally detected in some samples; in these saliva samples small amalgam particles were actually seen by the naked eye. During the first 24 hours 68 % of the total release was observed from the polished fillings and 61 % from the unpolished ones; in two days the percentages were 78 % and 69 %, respectively, and over a period of one week 90 % and 79 %. The average absolute release of mercury was 313 my g per filling in the first day. During the first week the average daily release was 60 my g per filling; during the last month of the experimental follow-up the daily release of mercury was 0.06 my g from the polished fillings and 0.09 my g from the unpolished ones. Except during the first day the daily release of mercury was much lower than the maximum daily exposure limit.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages18
ISBN (Print)951-38-3141-8
Publication statusPublished - 1988
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number548
ISSN0358-5077

Fingerprint

saliva
isotope
mercury
amalgam
body temperature
plastic
fold
liquid

Keywords

  • mercury amalgams
  • saliva

Cite this

Uusheimo, K., & Rytömaa, I. (1988). Mercury release from dental amalgam into saliva. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 548
Uusheimo, Kari ; Rytömaa, Inkeri. / Mercury release from dental amalgam into saliva. Espoo : VTT Technical Research Centre of Finland, 1988. 18 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 548).
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Uusheimo, K & Rytömaa, I 1988, Mercury release from dental amalgam into saliva. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 548, VTT Technical Research Centre of Finland, Espoo.

Mercury release from dental amalgam into saliva. / Uusheimo, Kari; Rytömaa, Inkeri.

Espoo : VTT Technical Research Centre of Finland, 1988. 18 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 548).

Research output: Book/ReportReport

TY - BOOK

T1 - Mercury release from dental amalgam into saliva

AU - Uusheimo, Kari

AU - Rytömaa, Inkeri

PY - 1988

Y1 - 1988

N2 - The purpose of the present study was to determine the quantity of mercury released into saliva from dental amalgan. Five fillings made from an amalgam labeled by 203Hg-isotope were prepared in plastic cases. The fillings were kept in the saliva at the body temperature (37 ± 3 °C). The saliva was changed first after a 24-hour period, then every second day, later weekly and finally once in a month. The count rate of the released Beta-/gamma-active isotope was measured by means of a liquid scintillation counter. The effect of polishing on the release of mercury was also studied. To this end three of the fillings were polished one week and again four weeks after the insertion. Two unpolished fillings were used as controls. The results from the polished and unpolished fillings differed clearly from each other. Following the polishing day a many fold amount of mercury was released from the polished fillings compared with the unpolished fillings. This difference, however, disappeared after one or at the latest after two days from the polishing. Interestingly over a long time period, more mercury was released from the unpolished than from the polished fillings. Exceptionally high mercury values were occasionally detected in some samples; in these saliva samples small amalgam particles were actually seen by the naked eye. During the first 24 hours 68 % of the total release was observed from the polished fillings and 61 % from the unpolished ones; in two days the percentages were 78 % and 69 %, respectively, and over a period of one week 90 % and 79 %. The average absolute release of mercury was 313 my g per filling in the first day. During the first week the average daily release was 60 my g per filling; during the last month of the experimental follow-up the daily release of mercury was 0.06 my g from the polished fillings and 0.09 my g from the unpolished ones. Except during the first day the daily release of mercury was much lower than the maximum daily exposure limit.

AB - The purpose of the present study was to determine the quantity of mercury released into saliva from dental amalgan. Five fillings made from an amalgam labeled by 203Hg-isotope were prepared in plastic cases. The fillings were kept in the saliva at the body temperature (37 ± 3 °C). The saliva was changed first after a 24-hour period, then every second day, later weekly and finally once in a month. The count rate of the released Beta-/gamma-active isotope was measured by means of a liquid scintillation counter. The effect of polishing on the release of mercury was also studied. To this end three of the fillings were polished one week and again four weeks after the insertion. Two unpolished fillings were used as controls. The results from the polished and unpolished fillings differed clearly from each other. Following the polishing day a many fold amount of mercury was released from the polished fillings compared with the unpolished fillings. This difference, however, disappeared after one or at the latest after two days from the polishing. Interestingly over a long time period, more mercury was released from the unpolished than from the polished fillings. Exceptionally high mercury values were occasionally detected in some samples; in these saliva samples small amalgam particles were actually seen by the naked eye. During the first 24 hours 68 % of the total release was observed from the polished fillings and 61 % from the unpolished ones; in two days the percentages were 78 % and 69 %, respectively, and over a period of one week 90 % and 79 %. The average absolute release of mercury was 313 my g per filling in the first day. During the first week the average daily release was 60 my g per filling; during the last month of the experimental follow-up the daily release of mercury was 0.06 my g from the polished fillings and 0.09 my g from the unpolished ones. Except during the first day the daily release of mercury was much lower than the maximum daily exposure limit.

KW - mercury amalgams

KW - saliva

M3 - Report

SN - 951-38-3141-8

T3 - Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports

BT - Mercury release from dental amalgam into saliva

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Uusheimo K, Rytömaa I. Mercury release from dental amalgam into saliva. Espoo: VTT Technical Research Centre of Finland, 1988. 18 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 548).