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Lab talk, the good, the bad, and the ugly
Metal
Bridges Gassing
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<blockquote data-quote="desertfox384" data-source="post: 40921" data-attributes="member: 1501"><p>I thought it was just a fluke..maybe overheated metal or something. Let me back up, 5 unit NP bridge, Rex CC (Chromium, Cobalt) Everything went fine with it, opaqued, then I packed dentin layer and had about 5 bubbles... mostly small and one BIG one. Stripped it, refinished and re-packed.. same results. Ok stripped it again finished with new stones very well, checked all my opaque temps etc.. same results. Big gassing all the way to the metal..its blowing 1.5mm holes thru my opaque and porcelain. Rewaxed the bridge. At this point im thinking it was overheated or something. Re opaqued and packed today and same exact results. 7 or 8 tiny holes and one big bubble probably 1mm in diameter. </p><p></p><p>Any ideas? I realize it could be a plethora of things. I have done plenty of single units with no gassing, only bridges. I also had a 6 unit semi precious bridge gas (callisto 75)... mostly on the lingual. Previously the bridges ive done with this metal did not gas, but they were smaller 3 unit bridges.</p><p></p><p>We blast metal at 3 bars and steam clean really well.. I degas and the surface looks good to me. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused :confused:" loading="lazy" data-shortname=":confused:" /></p><p>Called metal supplier and left a message but have not gotten a call back yet</p></blockquote><p></p>
[QUOTE="desertfox384, post: 40921, member: 1501"] I thought it was just a fluke..maybe overheated metal or something. Let me back up, 5 unit NP bridge, Rex CC (Chromium, Cobalt) Everything went fine with it, opaqued, then I packed dentin layer and had about 5 bubbles... mostly small and one BIG one. Stripped it, refinished and re-packed.. same results. Ok stripped it again finished with new stones very well, checked all my opaque temps etc.. same results. Big gassing all the way to the metal..its blowing 1.5mm holes thru my opaque and porcelain. Rewaxed the bridge. At this point im thinking it was overheated or something. Re opaqued and packed today and same exact results. 7 or 8 tiny holes and one big bubble probably 1mm in diameter. Any ideas? I realize it could be a plethora of things. I have done plenty of single units with no gassing, only bridges. I also had a 6 unit semi precious bridge gas (callisto 75)... mostly on the lingual. Previously the bridges ive done with this metal did not gas, but they were smaller 3 unit bridges. We blast metal at 3 bars and steam clean really well.. I degas and the surface looks good to me. :confused: Called metal supplier and left a message but have not gotten a call back yet [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
Bridges Gassing
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