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Jo Bale
Joined:
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29-May-2006
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Started On : 22-Mar-2010 at 03:08:13 AM, #Views : 5899
Topic Subject : Re: Lines, airbubbles, alginate and more |
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Hi Ali,
I'm a silent observer of the forum as a rule but with such interesting discussions going on I can't help but join in!
Of course I agree with Dave on the whole :-) but I seem to have removed the rivulet pattern from casts by ensuring the plaster is not mixed too weak. If there is insufficient plaster to absorb all the water the excess water finds its way out to the top of the casts making the rivulets on the way. I find this is also made worse if I have used a runny mix of alginate as there is more water in the mould that seems to come from the surface of the alginate.
Mixing plaster in a manner that creates as few bubbles as possible is important - spatulation is the technical term for plaster mixing that is taught at dental school in the UK. I do vacuum the plaster after mixing & before puring into the mould, although I am still perfecting this!
Hope I've added a bit to the topic & perhaps I'll comment a bit more if I can be of use - it's great to see the European side of the forum more active too.
Jo Bale
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