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Medical Forum / General / Dentistry / August 2006Who is your favourite dentistry guru?
Hi all, I was just pondering the idea of "gurus" & I thought the following questions may hopefully make some interesting & entertaining discussion:) Including people in this newsgroup & others in the field, whom do you consider to be the present-day "gurus" in dentistry? ...I mean the people who guide others, are inspirational & highly respected for their work & contributions in this field. Who is your favourite guru & why? Please take the question in a light-hearted way. Maybe this is just a chance to honour someone you respect. Maybe some readers will check out your "guru" and also enjoy them. Tony Burch excellent question ..... double meaning here ...... -- Joel34 > Hi all, > [quoted text clipped - 13 lines] > > Tony Burch Tony, Writing from the experience of a regular correspondent who has been trying for many years to get rational and scientific answers to some rational and scientific questions regarding the electrical behavior of metal amalgam dental fillings, I would say that sci.med.dentistry attracts a lot of desperately ignorant dentists who have little to offer but a monotonously juvenile brand of ridicule and sarcasm. But I don't think you'll find any "gurus" here. Keith P Walsh By the way, I've noticed that you have a background in electronics, and I was wondering if you might be able to help with my enquiries. If you look at: http://www.elektrotechnik.hs-magdeburg.de/Mitarbeiter/hinken/news/N6.htm - you will see a graphical representation of the thermoelectric eddy current and associated electromagnetic field which are produced whenever an element of one electrical conductor is enclosed within a dissimilar conductive material and subjected to a temperature gradient across its length (figure d is most instructive). This phenomenon is utilised in the field of non-destructive materials testing to identify the presence of inclusions or impurities in metals by detecting the influence of the thermoelectrically generated electromagnetic field outside the surface of the material using very accurate sensors. An important aspect of this phenomenon is that it appears to be reversible - i.e. an externally applied electromagnetic field of the appropriate characteristics would have the effect of inducing the eddy current and corresponding temperature gradient in the dissimilar materials. If you now look at: http://book.boot.users.btopenworld.com/setting.htm - you will see that a typical dental amalgam is composed of a great many elements of electrically conductive material all enclosed within a matrix of another, dissimilar, electrically conductive material. Do you know of any reason why it should not be possible to measure the thermoelectric and/or electromagnetic properties of a typical dental amalgam? Further enquiries regarding the electrical properties of dental amalgams can be found at: http://book.boot.users.btopenworld.com/intro.htm Hi Keith, thank you for your interesting post. ... > But I don't think you'll find any "gurus" here. I don't know, maybe there are some:) Someone might even like to name a colleague whom they have found to be especially helpful, enlightening & inspiring? Regarding your following question, I don't know for sure, but I will tell you what I think. (I do also have an interest in physics, but I am not a physicist:) )... ... > If you look at: > [quoted text clipped - 5 lines] > dissimilar conductive material and subjected to a temperature gradient > across its length (figure d is most instructive). Yes, I observe that in this illustration, the enclosed dissimilar material is in a "single slab" that spans the temperature difference region. I believe the "single slab" point is the critical one - I will explain below. > This phenomenon is utilised in the field of non-destructive materials > testing to identify the presence of inclusions or impurities in metals > by detecting the influence of the thermoelectrically generated > electromagnetic field outside the surface of the material using very > accurate sensors. I believe in this case that the metal is an alloy, and as such would still act as a "slab" of homogeneous material with a particular Seebeck coefficient. I believe that the level of impurity would affect the Seebeck coefficient, and this can be measured. I don't know for sure - I am guessing that his is how it's done? If you have a web link, I would be interested to have a look. > An important aspect of this phenomenon is that it appears to be > reversible - i.e. an externally applied electromagnetic field of the > appropriate characteristics would have the effect of inducing the eddy > current and corresponding temperature gradient in the dissimilar > materials. Yes, in thinking about what the Seebeck and Peltier effects are doing, it is helpful to consider both the "voltage generation" and the reverse case of "temperature difference generation". > If you now look at: > [quoted text clipped - 7 lines] > thermoelectric and/or electromagnetic properties of a typical dental > amalgam? I believe it won't work because even though the dissimilar metals are enclosed, they are not in a single slab - they are in "micro slabs" or particles. The eddy currents around each "micro slab" would cancel with adjacent ones (sum to zero), not enabling an eddy current loop to form, and hence no generated magetic field. ...I could be wrong but on my first pass it seems like this could be the case. I'm not sure without thinking about it more deeply. Tony Burch Hi Tony, If I had any favourite gurus, it would probably be people who didn't consider themselves to be "gurus". I am a bit annoyed by dentists blindly following anything a self-appointed "guru" says, as I would like to think that dentists are scientists basing their practices on available evidence rather than who said what. If you want names, my favourite dental personnas would be Gordon Christensen, Miles Markley and Angelo Sargenti (don't like his technique but I am inspired by what he was trying to achieve). Regards, George |
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