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Lab talk, the good, the bad, and the ugly
Metal
Spruing help
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<blockquote data-quote="charles007" data-source="post: 64953" data-attributes="member: 9"><p>Al nailed all the must do's to prevent miscast.. If your having good results with gold, I don't think spruing is your problem.. 1. Check alloy directions with your investment and raise temp to allow for you oven to being off,,, calibrate oven next ! 2. Make sure your investment is no more than 1/4 " over top of patterns, and scrap top of ring.. 3. Extra turn on casting machine, I also use 4 turns. 5. 45 sec to cast ? may not work ? never tried ? I probably spend no more than 15 seconds tops from oven to release of arm.</p><p>To put it in a nut shell using these alloys, higher heat in oven, hotter flame, more turns on casting arm, 10g or 8 g sprues, correct pressure on oxy and propane, and cast fast !</p><p></p><p>I've used pd ag alloys for 25 years without any issues.. I cast .3 - .35 and expect a single miscasts about every 3 to 4 or months, and ususally know when it will happen..No more than 4 miscasts per year.. I seal margins with the same color of wax so I want make margins to thick.. maybe just the opposite of others.. It is slightly thicker though.. I hate metal finishing with a passion, so I wax very thin.. (Back when I was foolish, I cast NP between .1 and .2 did I say I hate metal finishing. With np, its all about temp, sprues and casting fast.) ! On molar and bi's coping, I sprue on the mesial or distal marginal ridge to save in metal finishing and prevent gringing holes on buccal or lingual where it might be thin. On anteriors, I sprue on mesial or distal incisal edge to prevent grinding holes on the facial or lingual where its sooo thin.. Also tilt crowns to outside wall, out of thermal zone like emax..</p></blockquote><p></p>
[QUOTE="charles007, post: 64953, member: 9"] Al nailed all the must do's to prevent miscast.. If your having good results with gold, I don't think spruing is your problem.. 1. Check alloy directions with your investment and raise temp to allow for you oven to being off,,, calibrate oven next ! 2. Make sure your investment is no more than 1/4 " over top of patterns, and scrap top of ring.. 3. Extra turn on casting machine, I also use 4 turns. 5. 45 sec to cast ? may not work ? never tried ? I probably spend no more than 15 seconds tops from oven to release of arm. To put it in a nut shell using these alloys, higher heat in oven, hotter flame, more turns on casting arm, 10g or 8 g sprues, correct pressure on oxy and propane, and cast fast ! I've used pd ag alloys for 25 years without any issues.. I cast .3 - .35 and expect a single miscasts about every 3 to 4 or months, and ususally know when it will happen..No more than 4 miscasts per year.. I seal margins with the same color of wax so I want make margins to thick.. maybe just the opposite of others.. It is slightly thicker though.. I hate metal finishing with a passion, so I wax very thin.. (Back when I was foolish, I cast NP between .1 and .2 did I say I hate metal finishing. With np, its all about temp, sprues and casting fast.) ! On molar and bi's coping, I sprue on the mesial or distal marginal ridge to save in metal finishing and prevent gringing holes on buccal or lingual where it might be thin. On anteriors, I sprue on mesial or distal incisal edge to prevent grinding holes on the facial or lingual where its sooo thin.. Also tilt crowns to outside wall, out of thermal zone like emax.. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
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Spruing help
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