Quote:
Originally Posted by TheLabGuy
Russ, you're the man. However, if i'm not pressing, just building/stacking, I use very little porcelain and a very fine tipped brush (smileline). All my anatomy is built in, If it takes me more than 1 min to finish a crown, I didn't build it correctly. I will use a endo file ( size 5 or 10) to create some deeper grooves coming out of the fossa, but still do this in the building stage. Chicken scratches result from a ceramist who would rather finish (lazy way) his/her anatomy in with a handpiece rather than build it (just my observations). Another neat little trick for all you small labs I learned along the way to cut cost is, I never mix porcelain on a glass slab, I work directly out of the bottles, less waste and saves time. Hope this helps.
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Rob,
I agree with your technique for hand building the porcelain. I teach my posterior occlusion course in wax because you can add and subtract quickly. The occlusal compass concept is generic to all materials. If you understand the compass, the build-up is fast and natural. I like to use Renfert's Pro Form 12 liquid in the porcelain as it holds the form better while adding the morphology. As in my waxing course, I start with the mesial buccal, distal buccal. mesial lingual and finish with the distal lingual. By doing the steps you can add internal stains between each step which looks very natural after firing. Below are some pic's from a demo I did in Chicago a few years ago.
Russell T. DeVreugd, CDT