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Lab talk, the good, the bad, and the ugly
Metal
C&B Investment problems
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<blockquote data-quote="JMN" data-source="post: 215218" data-attributes="member: 8469"><p>I don't do C&B anymore. Started my own removables lab last year. But, here's what I know. Not trying to talk down to you with over detailed, just don't know what could help. We used Jensen metals. Primarily Superior, JPW, JCB, Classic IV, and Endurance in that order.</p><p></p><p>Don't know what system of rings you use, or if it matters, we used the Belle de StClair oval rings with the straight sprue bars.</p><p>We did many many screw retained and custom abutments. Very few issues aside from a rare bubble in the screw channel which would be taken care of with a fissure burr or 1/2round.</p><p>The abutment interface and screw channel would be treated with Wax-it debublizer just as the wax was prior to investing. This would be very gently blown to dryness if it couldn't be "drip dried" for time/volume issues.</p><p></p><p>When investing we'd slowly pour it so that the capillary effect would pull the investment through the screw channel and then over the interface instead of letting the investment pour over the interface into the screw channel. This is where we found the best success in preventing overcasting.</p><p></p><p>Do you use a vent? We'd put the a 20ga wire wax at the opposite side from the sprue and centered at the joint between the wax and metal. This prevented short castings, well we thought it did <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>I'm gonna think some more and see what else I can remember that may help you.</p><p></p><p>Edit:</p><p>We bench set for 20 minutes before going into a metal temp oven, heat soak for 1hr, then cast. We used a broken arm cast also. If we let it set overnight, we'd put it in the oven cold and rise the oven at 1800 deg c/hr to the 800c or 820c the metal asked for, then 30min heatsoak after temp was reached.</p></blockquote><p></p>
[QUOTE="JMN, post: 215218, member: 8469"] I don't do C&B anymore. Started my own removables lab last year. But, here's what I know. Not trying to talk down to you with over detailed, just don't know what could help. We used Jensen metals. Primarily Superior, JPW, JCB, Classic IV, and Endurance in that order. Don't know what system of rings you use, or if it matters, we used the Belle de StClair oval rings with the straight sprue bars. We did many many screw retained and custom abutments. Very few issues aside from a rare bubble in the screw channel which would be taken care of with a fissure burr or 1/2round. The abutment interface and screw channel would be treated with Wax-it debublizer just as the wax was prior to investing. This would be very gently blown to dryness if it couldn't be "drip dried" for time/volume issues. When investing we'd slowly pour it so that the capillary effect would pull the investment through the screw channel and then over the interface instead of letting the investment pour over the interface into the screw channel. This is where we found the best success in preventing overcasting. Do you use a vent? We'd put the a 20ga wire wax at the opposite side from the sprue and centered at the joint between the wax and metal. This prevented short castings, well we thought it did :) I'm gonna think some more and see what else I can remember that may help you. Edit: We bench set for 20 minutes before going into a metal temp oven, heat soak for 1hr, then cast. We used a broken arm cast also. If we let it set overnight, we'd put it in the oven cold and rise the oven at 1800 deg c/hr to the 800c or 820c the metal asked for, then 30min heatsoak after temp was reached. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
C&B Investment problems
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