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Medical Forum / General / Dentistry / November 2004flouride level and tooth decay question
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 > 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 Sure: 0.6 + 0.4 - 1  Signature-History of fluorine, fluoride and fluoridation-: --- http://PMeiers.bei.t-online.de/index.htm --- ---------------------------------------------------- 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 >> 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 [quoted text clipped - 6 lines] > > 0.6 + 0.4 - 1 > 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 >>>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 [quoted text clipped - 6 lines] >> >>0.6 + 0.4 - 1 Steve, a great reply over which I can agree for the greatest part, except a few points: > > 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 [quoted text clipped - 3 lines] > 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 Signature-History of fluorine, fluoride and fluoridation-: --- http://PMeiers.bei.t-online.de/index.htm --- ---------------------------------------------------- > Steve, > [quoted text clipped - 31 lines] > Regards, > Peter The OP's original query sounded a little bit like a homework assignment to me. Steve SignatureMark & Steven Bornfeld DDS http://www.dentaltwins.com Brooklyn, NY 718-258-5001 actually that was the question asked in exam > Steve, > [quoted text clipped - 34 lines] > Regards, > Peter |
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