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Lab talk, the good, the bad, and the ugly
Metal
Arrggghhhh!
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<blockquote data-quote="charles007" data-source="post: 219619" data-attributes="member: 9"><p>Interesting hole where sprue was cut off to short <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p><p>Here's a tip if you tend to wax thicker crowns and want to save time metal finishing</p><p>My most hated job in the lab is metal finishing <img src="/forums/styles/default/xenforo/smilies/arghh.png" class="smilie" loading="lazy" alt=":arghh:" title="arghh :arghh:" data-shortname=":arghh:" />... so I learned how to cast very thin casting consistently at .15 - .2 in NP and .3 with noble alloys..</p><p>On average single unit crowns, sprue mesial or distal incisal corner so you don't worry about cutting holes on facial/lingual or incisal edge like</p><p>one on these crowns. Posterior crowns, sprue mesial or distal marginal ridge where your adding wings in the build-up. Spruing in these areas will speed</p><p>up metal finishing and prevent cutting off sprues to short incisal edges and cusp tips where you normally attach sprues.</p><p>On single unit where large amounts of wax are built up, naturally you sprue thickest part of pattern.</p><p>Anyone should be able to case .3 without miscast with NP or Noble alloys if your dipped coping is .3 without thin spots and or thin areas on the margins..</p><p>If anyone is wondering how often I have miscasts... maybe 1 crown every 4 to 6 months... aprox 3 times a years = 6 units max. When I get a miscast, 25% of the</p><p>time I realize I may get a miscast once I release the casting arm... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite11" alt=":rolleyes:" title="Roll Eyes :rolleyes:" loading="lazy" data-shortname=":rolleyes:" /> incorrect flame...<img src="/forums/images/smilies/test/banghead.gif" class="smilie" loading="lazy" alt="Banghead" title="Banghead Banghead" data-shortname="Banghead" /></p><p>Now that I cast fewer pfms per year since I'm using zirconia, its critical I don't overlook easy correctable mistakes on my part... <img src="/forums/images/smilies/test/hello.gif" class="smilie" loading="lazy" alt=":Hello:" title="Hello :Hello:" data-shortname=":Hello:" /></p></blockquote><p></p>
[QUOTE="charles007, post: 219619, member: 9"] Interesting hole where sprue was cut off to short :( Here's a tip if you tend to wax thicker crowns and want to save time metal finishing My most hated job in the lab is metal finishing :arghh:... so I learned how to cast very thin casting consistently at .15 - .2 in NP and .3 with noble alloys.. On average single unit crowns, sprue mesial or distal incisal corner so you don't worry about cutting holes on facial/lingual or incisal edge like one on these crowns. Posterior crowns, sprue mesial or distal marginal ridge where your adding wings in the build-up. Spruing in these areas will speed up metal finishing and prevent cutting off sprues to short incisal edges and cusp tips where you normally attach sprues. On single unit where large amounts of wax are built up, naturally you sprue thickest part of pattern. Anyone should be able to case .3 without miscast with NP or Noble alloys if your dipped coping is .3 without thin spots and or thin areas on the margins.. If anyone is wondering how often I have miscasts... maybe 1 crown every 4 to 6 months... aprox 3 times a years = 6 units max. When I get a miscast, 25% of the time I realize I may get a miscast once I release the casting arm... :rolleyes: incorrect flame...Banghead Now that I cast fewer pfms per year since I'm using zirconia, its critical I don't overlook easy correctable mistakes on my part... :Hello: [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
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