flouride level and tooth decay question

Akbar

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Nov 9, 2004, 2:35:19 PM11/9/04

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natural fluoride level of 0.6 ppm.if the fluoride level is raised by 0.4
ppm,tooth decay among grade grade school children is expected to decrease by
approximately what percent after seven years

could someone please help how to calculate this

Peter Meiers

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Nov 9, 2004, 2:42:09 PM11/9/04

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Sure:

0.6 + 0.4 - 1

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Akbar

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Nov 9, 2004, 4:59:42 PM11/9/04

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thanks for replying back could u please provide detail on the answer as all
i see is u just added both nuber but how would u calculate the percentage

"Peter Meiers" <Tren...@yahoo.com> wrote in message
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Steven Bornfeld

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Nov 9, 2004, 7:42:39 PM11/9/04

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Akbar wrote:
> thanks for replying back could u please provide detail on the answer as all
> i see is u just added both nuber but how would u calculate the percentage
>

I doubt very much you are going to find usable data. First of all,
0.6-1.0 ppm is generally considered the range for effective water
fluoridation. We would never for example recommend enteral fluoride
supplementation for a patient in a water supply in that range.
Furthermore, there is so much fluoride in the food supply, toothpaste
etc. that in most parts of the world it would be difficult in vivo to
determine the average increase in actual dose.
In any case, the bulk of recent research tends to indicate that the
primary mode of caries inhibition is topical exposure. I think it would
be difficult to impossible to demonstrate a benefit for an incremental
increase in fluoride concentration within the generally accepted
therapeutic concentration.

Steve

Peter Meiers

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Nov 10, 2004, 12:41:49 AM11/10/04

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Steve,

a great reply over which I can agree for the greatest part, except a few
points:

> Akbar wrote:
> > thanks for replying back could u please provide detail on the answer as all
> > i see is u just added both nuber but how would u calculate the percentage

With ZERO as a result it doesn´t matter whether it means number of
children, teeth or percentage.

> I doubt very much you are going to find usable data. First of all,
> 0.6-1.0 ppm is generally considered the range for effective water
> fluoridation. We would never for example recommend enteral fluoride
> supplementation for a patient in a water supply in that range.
> Furthermore, there is so much fluoride in the food supply, toothpaste
> etc. that in most parts of the world it would be difficult in vivo to
> determine the average increase in actual dose.

It is already next to impossible to determine the average (nor
individual) actual dose without an "increase".

> In any case, the bulk of recent research tends to indicate that the
> primary mode of caries inhibition is topical exposure. I think it would
> be difficult to impossible to demonstrate a benefit for an incremental
> increase in fluoride concentration within the generally accepted
> therapeutic concentration.

It also was "difficult" back in Dean´s times without the so-called
"halo" effect. There was no demonstrated benefit if you look carefully
at Dean´s statistics.

Regards,
Peter

Mark & Steven Bornfeld DDS

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Nov 10, 2004, 9:24:03 AM11/10/04

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The OP's original query sounded a little bit like a homework assignment
to me.

Steve

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

Akbar

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Nov 10, 2004, 8:04:43 PM11/10/04

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actually that was the question asked in exam

"Peter Meiers" <Tren...@yahoo.com> wrote in message

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