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Lab talk, the good, the bad, and the ugly
Metal
Rocking, Rocking, ROCKING!
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<blockquote data-quote="Al." data-source="post: 16932" data-attributes="member: 382"><p>I agree its probably your spruing or connecting technique. Rocking bridges are no the norm here.</p><p></p><p>I dip, then build everyting up, then add my pontic. Then cut one connection with a razor.</p><p></p><p>Then I cut back the dipping wax and reseal the margins.</p><p>Seat everything then I add a very small amount of wax on the connection , usually on the gin side.</p><p>I go on to working on other units to let that cool and shrink completely.</p><p>Then add a small bit again usually on the occ side. Let it cool then add the M @ D.</p><p>In other words, dont add alot of wax or duraly or glue to the connection area at once because it contracts and will warp your bridge.</p><p></p><p>I sprue 10 ga wax on every coping and pontic then when that completley cools I put a plastic runner bar on top. Tacking it down a little at a time.</p><p></p><p>Then pop the dies. </p><p></p><p>I wax everyting in one day so I have several bridges I wax at once. So I just pick up one model at a time and add bit of wax on each connection and have them all connected and sprued in a group in 10 to 15 minutes.</p><p></p><p>Long spans are unpredictable.</p><p>Up to 6 units though it should be rare to get rocks.</p></blockquote><p></p>
[QUOTE="Al., post: 16932, member: 382"] I agree its probably your spruing or connecting technique. Rocking bridges are no the norm here. I dip, then build everyting up, then add my pontic. Then cut one connection with a razor. Then I cut back the dipping wax and reseal the margins. Seat everything then I add a very small amount of wax on the connection , usually on the gin side. I go on to working on other units to let that cool and shrink completely. Then add a small bit again usually on the occ side. Let it cool then add the M @ D. In other words, dont add alot of wax or duraly or glue to the connection area at once because it contracts and will warp your bridge. I sprue 10 ga wax on every coping and pontic then when that completley cools I put a plastic runner bar on top. Tacking it down a little at a time. Then pop the dies. I wax everyting in one day so I have several bridges I wax at once. So I just pick up one model at a time and add bit of wax on each connection and have them all connected and sprued in a group in 10 to 15 minutes. Long spans are unpredictable. Up to 6 units though it should be rare to get rocks. [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Rocking, Rocking, ROCKING!
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