Al.
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Interesting that you now have a pinned model. Were the abutments delivered and an impression taken???
Sent for metal try in then pick up impression??
Seems like stacking the gingival portion is going to be a bit more difficult???
Like to know what others do when I see something like this.
Al, ever experimented with the Bredent casting technique? Or anyone else here? - Looks a bit radical to me with the use of sink-heads. They claim to have superior accuracy and reliability with their castings.
copied from Bredent pdf - single spue for bridge.
link
bredent GmbH & Co.KG
go to "casting technique" under "brochures"
This is something I've not tried, just don't have time to do trials for something such as this.
Hey Al, great documentation. I'm curious, how are your castings getting so shiny...is it just the metal? I'm talking the sheen look after devesting (glass beads?)
I am sure it can be done but the majority of abutments today are not being done in gold. It makes so little sense when Ti has so many advantages.
I am searching Pub-med for articles right now that give some sort of reasoning why gold is a more preferred material and have not found anything concrete.
Like I said I think the old timers are just set in their ways.
When we did these types of cases before we invested in cad/cam the units were waxed in milling wax, put on the milling machine and shaped, casted then re milled. It was a very labor intensive way of doing it. I can't tell you how many late late nights I had in the lab doing milled 2 degree abutments with galvano copes cemented into a substructure to support a denture.
These were and are sweet appliances.
I used glass beads just for the pic. I normally use AL and their dull.
But it is intresting when I do devest the castings they come out really shiney just like the pic, in the areas that the investment comes of cleanly. I dont know if that is the nature of PD or just this metal but my 40% au castings come out dull.
After the pics I sandblast the whole thing so I can see spots I might miss finishing it and fitting them because its hard to see bubbles with the inside shiney.