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Lab talk, the good, the bad, and the ugly
Metal
High Noble Gold Porosity.
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<blockquote data-quote="charles007" data-source="post: 9118" data-attributes="member: 9"><p>Rob,</p><p>Don't use more than 2.5 to 3 turns on you casting machine, even on an old one, I bet you are using 4 turns or more?</p><p>Since this is probably a rare occurence, calibrate your burnout oven . If you are like me ,I haven't checked mine in years. Also look at the botton of the sprue button, is it razor sharp? = over heating . Check lbs on your propane and oxy to see if its been accidently changed. I know we all know these techniques, but worth checking.......... crap happens</p><p> I use the Renfert pear shape sprues, on molars that are very heavy, I sprue both lingual cusps to prevent porosity....... Very rare that I use 2 sprues. Flair out the connection of the sprue to the cusp. Also place the patterns on the outside wall, out of the heat zone... </p><p></p><p>Charles</p></blockquote><p></p>
[QUOTE="charles007, post: 9118, member: 9"] Rob, Don't use more than 2.5 to 3 turns on you casting machine, even on an old one, I bet you are using 4 turns or more? Since this is probably a rare occurence, calibrate your burnout oven . If you are like me ,I haven't checked mine in years. Also look at the botton of the sprue button, is it razor sharp? = over heating . Check lbs on your propane and oxy to see if its been accidently changed. I know we all know these techniques, but worth checking.......... crap happens I use the Renfert pear shape sprues, on molars that are very heavy, I sprue both lingual cusps to prevent porosity....... Very rare that I use 2 sprues. Flair out the connection of the sprue to the cusp. Also place the patterns on the outside wall, out of the heat zone... Charles [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
High Noble Gold Porosity.
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