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Lab talk, the good, the bad, and the ugly
Zirconium
Long Span Implant Retained Bridges - Problem With Breaking
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<blockquote data-quote="JohnWilson" data-source="post: 258347" data-attributes="member: 213"><p>I hear you Bob, so glad the days of 65sf casted bars and substructures are a thing of the past. I always think of the one bar I did when we calculated the wax weight we needed to throw 3.6oz just for the pattern and then double that for the runner bar/sprue and button. I watched the casting tech do this one and I am sure having me watching made it even worse. Thank god for no splash and the thing worked but I always hoped for a better way.</p><p></p><p>As to the verification I mentioned, I noticed that when a verification jig gives a false reading its because the analog is often too LOW in the model and this allows the jig to seat in the mouth and unless the client is taking perfect radiographs at exactly a right angle to the fixture the film will look like everything is correct.</p><p></p><p>This leads to the screw constantly pulling and essentially extracting the cad base from the zirconia as its constantly under tension and is not bottomed out in the morse taper of the implant. This is when I see things start to go sour down the line.</p></blockquote><p></p>
[QUOTE="JohnWilson, post: 258347, member: 213"] I hear you Bob, so glad the days of 65sf casted bars and substructures are a thing of the past. I always think of the one bar I did when we calculated the wax weight we needed to throw 3.6oz just for the pattern and then double that for the runner bar/sprue and button. I watched the casting tech do this one and I am sure having me watching made it even worse. Thank god for no splash and the thing worked but I always hoped for a better way. As to the verification I mentioned, I noticed that when a verification jig gives a false reading its because the analog is often too LOW in the model and this allows the jig to seat in the mouth and unless the client is taking perfect radiographs at exactly a right angle to the fixture the film will look like everything is correct. This leads to the screw constantly pulling and essentially extracting the cad base from the zirconia as its constantly under tension and is not bottomed out in the morse taper of the implant. This is when I see things start to go sour down the line. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Zirconium
Long Span Implant Retained Bridges - Problem With Breaking
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