[Jewelry making - Article 00046] - Re: [Orchid] Mixing dental compounds

[JoJu428]

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>     is tap water okay, or is this a good time to use distilled? You out
>     there, Skip Meister? 

    Dear Dave, I'm not Skip, just a retired dentist who loves
    silversmithing and jewelry making. So I thought I'd add my two cents
    to this. I have always used plain tap water for mixing dental
    "stone", but depending upon the hardness of your water, you might
    find it necessary to use distilled. Try it without and the results
    will guide you. My guess is that tap water should work. I would, at
    the beginning of my career, measure everything and weigh the powder,
    but after a while one develops a feel for the proper consistency,
    and mixing the stuff to a heavy sour cream consistency would give
    comparable results. 

    As to the use of Alginate impression material; there are many more
    impression materials having greater accuracy's and less sensitive to
    time between impression taking and model pouring. These are
    generically the polyurethane's, silicones, rubbers, etc. Things
    similar to RTV's used in the casting process. 

HTH Joe Dule (retired DDS)

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