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Medical Forum / General / Dentistry / September 2005

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Chuck - 17 Sep 2005 10:27 GMT
When we all know that amalgams are harmless.

"Our results showed that dentists had significant exposure to Hg vapor
compared to control subjects and therefore might be subject to possible
adverse effects due to Hg toxicity."
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstra
ct&list_uids=16138728&query_hl=15

Mark & Steven Bornfeld - 17 Sep 2005 16:26 GMT
> When we all know that amalgams are harmless.
>
> "Our results showed that dentists had significant exposure to Hg vapor
> compared to control subjects and therefore might be subject to possible
> adverse effects due to Hg toxicity."
> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstra
ct&list_uids=16138728&query_hl=15

    There is no question that dental personnel using amalgam are exposed to
high levels of mercury in the working environment.  This exposure is
many orders of magnitude greater than the patient.
    It is rare but not unknown to see serious mercury toxicity in dental
personnel.  I do not have the reference, but there was at least one case
of death from acute renal failure in a dental "nurse" in the UK.  I
remember referencing this and many other mercury toxicity studies when I
was an officer of the occupational safety and health committee of my
dental school in the mid 1970s.
    Mercury hygiene was taught at our school.  Back in those days many
dentists did not use pre-measured capsules.  I note that this particular
study was done in Turkey, where mercury hygiene is likely much more
inconsistant than in the west.
    I have no reason to doubt that many dental personnel are walking around
with significant mercury loads.  Some may suffer disease which may not
be recognized as mercury toxicity.  However, most dentists are pretty
well-informed on mercury hygiene these days, so the numbers with
mercury-related illness that is undiagnosed is likely quite small.

Steve

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Mark & Steven Bornfeld DDS
http://www.dentaltwins.com
Brooklyn, NY
718-258-5001

Chuck - 19 Sep 2005 01:03 GMT
>There is no question that dental >personnel .using amalgam are exposed to
>high levels of mercury in the working >environment.  This exposure is
>many orders of magnitude greater than the >patient.

This defies logic IMO. The belief that amalgam is hazardous, until it
is placed in the mouth, then it becomes benign. That is an absurd view
that I don't except. It gives off chronic vapor, albeit minute, yet
still chronic. This vapor is enhanced by chewing, hot liquids, etc. I
see no reason why it should still be in use. Even if a lesser quality
material (for restoration purposes) is used, it sure outweighs chronic
exposure to a very powerful toxin. CB
Steven Bornfeld - 19 Sep 2005 04:34 GMT
>>There is no question that dental >personnel .using amalgam are exposed to
>>high levels of mercury in the working >environment.  This exposure is
[quoted text clipped - 7 lines]
> material (for restoration purposes) is used, it sure outweighs chronic
> exposure to a very powerful toxin. CB

    You're entitled to your opinion.  Is your problem with my statement
that dental personnel are exposed to far greater quantities than the
general population a problem for you?

Steve

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Chuck - 19 Sep 2005 11:13 GMT
>You're entitled to your opinion.  Is your >problem with my statement
>that dental personnel are exposed to far >greater quantities than the
>general population a problem for you?
>Steve

Not at all. In my essay on my own experience I state. "the use of
amalgam as a restorative material puts both dental professionals, and
the public whom they care for, at risk". CB
Clinton - 19 Sep 2005 04:59 GMT
> >There is no question that dental >personnel .using amalgam are exposed to
> >high levels of mercury in the working >environment.  This exposure is
[quoted text clipped - 6 lines]
> see no reason why it should still be in use. Even if a lesser quality
> material (for restoration purposes) is used, it sure outweighs chronic

I'd also like to point out that research discussed/posted here
indicates that amalgam can be a significant source of mehtyl Hg,

Dental personell are never exposed to a toxic mix of methylated
Hg near a filling and Hg can be methylatied in the gut as well.
patients are never warned about this either!

In some cases the hg is actually leaking into the jaw and forming
a toxic brew of metals and bacteria.

It's easy to make a set of ideal assumptions and say, well the
amalgam will be mixed perfectly, it will always be stable, never
undergo any galvanic reaction or crevice corrosion, since we assume it
can't corrode therefore significant methylization cannot
occur either and therefore worst case dentist exposure will be much
greater. But is this string of assumptions really valid in the real
world, where deviations from the ideal are typical or just
unproven propganda? In fact i haven't seen any science in two years on
this list that

1) sets an upper limit on Elemental hg exposure from amalgam
2) characterises accurately all potential organic conversion
  from amalgam

So, to be brutally honest, who cares if some dentists are getting
more elemental Hg exposure than the average patient because they are
incredablity careless with Hg. I'm more concerned about the patient who
receives an amalgam mixed by that dentist! Nor is it really important
in these studies looking at elemental Hg exposure where the dental
effects clearly trend down to levels comparable with patient exposure
and I belive average dental exposure is roughly equivalent to what a
patient recieves from 4-5 amalgams.
Vaughn - 17 Sep 2005 16:57 GMT
> When we all know that amalgams are harmless.
>
> "Our results showed that dentists had significant exposure to Hg vapor
> compared to control subjects and therefore might be subject to possible
> adverse effects due to Hg toxicity."
> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstra
ct&list_uids=16138728&query_hl=15

    Do not confuse occupational exposure with patient exposure, they are two
very different discussions.  For example; while exposure x-rays is normally of
very little danger to the patient, the same is not so for the x-ray technician
who is tallying up exposure all day/every day for years at a time.

    Beryllium in dental alloys is a case in point;  as long as they are not
ground or polished while in the oral cavity, the current science says that
beryllium-containing dental alloys are perfectly safe in the patient's mouth,
yet they represent a very real danger to dental lab technicians and dentists who
work on them and breathe their dust.

Vaughn
 
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