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You people are the best. You definitely answered my question, and I didn't even mind the sarcasm and rants
Hey everyone. I'm a doctor in a big group practice with an internal lab, and I'm the liaison between the doctors and the lab. I was hoping you could help me out with this. Our lab mills zirconia crowns, the after they're sintered, they trim back the margins manually. Whenever there's a margin issue, my doctors say that the error is caused by the manual trimming, and that other labs don't do that. Our lab says that of course everyone does that - that's the only way it can be done. So who's right? Does everyone trim back their margins manually, and does that tend to be a big source of margin error?
If you can put up with our acerbic humor, you come on back now y'hear?You people are the best. You definitely answered my question, and I didn't even mind the sarcasm and rants
. That's where the real talent comes into play. Blending in the margin, maintaining at least 2 mm of blend of contour with emergence profile of underlying preparation. "Ring around the collar" (Tanaka) impressions give you that Really required anatomic reference to blend with.
Simply a term he uses for a succesful full margin capture impression. Also picks up anatomy of the tooth structure below the margin to assist in guiding emergence profile of the restoration to proper form. Good tissue management is essential to achieve this result.can you link the article/publication you’re referring to with Tanaka and the ring around the collar?
Absolutey! Great and makes our lives Sooo much better and what's required for us to do our thing without guessing and dreading. Thanks for showing
You use a homogenous rubber wheel in reverse? why? There is no direction in the cutting surface...About techniques used... not sure how the rest of you approach it but here’s what I do.
Follow pics.
First shows the White margin I see that needs finishing. I go at it with wheel spinning in reverse looking inside crown so I can see whats happening.
Second I do a light smoothing finish in reverse from buccal , wheel spinning away from margin.
Third shows buccal margin is finished.
that’s the way I skin this cat.
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Direction of debris is away from eyes this way for how is being heldYou use a homogenous rubber wheel in reverse? why? There is no direction in the cutting surface...
I am left handed, the debris is always away from eyes. Never considered this problem.Direction of debris is away from eyes this way for how is being held
…. did you see pics in post #20? I like to see the White edge margin as I’m finishing it back. For you being lefty, then run your handpiece in forward. Whatever works !You use a homogenous rubber wheel in reverse? why? There is no direction in the cutting surface...
Agree…. did you see pics in post #20? I like to see the White edge margin as I’m finishing it back......
i buy left handed mandrels. with the exception of carbides and diamonds i want that mess flying away from my face!I bet that sucks to have to buy a mounted finishing wheel every time instead of mandrel based. I guess you could buy left handed mandrels.
Maybe just use your left handi buy left handed mandrels. with the exception of carbides and diamonds i want that mess flying away from my face!
All margins have to be finished manually post sinter and I mean ALL of them from all machines and cam and cad softwares . So this was either over polishing or under finishing . Explorer picks it up from crown side it is over polished . Explorer picks it up from margin side it is under polished . No comment on model less crowns due to sheer lack of them where I work . As much as I know there is always offset at margin to be able to just mill it without chipping , now even if its thinned out to max there is still finishing needed after sinter .Hey everyone. I'm a doctor in a big group practice with an internal lab, and I'm the liaison between the doctors and the lab. I was hoping you could help me out with this. Our lab mills zirconia crowns, the after they're sintered, they trim back the margins manually. Whenever there's a margin issue, my doctors say that the error is caused by the manual trimming, and that other labs don't do that. Our lab says that of course everyone does that - that's the only way it can be done. So who's right? Does everyone trim back their margins manually, and does that tend to be a big source of margin error?