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Lab talk, the good, the bad, and the ugly
Metal
bubble in pontic in pfm bridge
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<blockquote data-quote="jijimon" data-source="post: 85302" data-attributes="member: 5651"><p>we had a 11 unit bridge case today</p><p>14-13-12-11 21-22-23 24-25-26-27</p><p>3 pontics 24-25-26</p><p>as usual i connected sprue to all the teeth</p><p>also fixed some extensions which look like reservoirs to the buccal side of the pontics</p><p>invested</p><p>preheated 1050 degrees ( ring only)</p><p>flame casted using non precious alloy in semi automatic centrifugal casting machine:mad2:</p><p></p><p>casting looked fine</p><p>allowed to cool down in room temprature</p><p>devested using air chisel</p><p>sand blasted</p><p>and i found a small bubble between the connection 25-26</p><p>i tried to remove it with tc burs and finds the bubble is getting bigger <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite4" alt=":mad:" title="Mad :mad:" loading="lazy" data-shortname=":mad:" /></p><p></p><p></p><p>some how i managed to clean the bubble and soldered it <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite6" alt=":cool:" title="Cool :cool:" loading="lazy" data-shortname=":cool:" /></p><p>but this happens to us almost every time we did a long span bridge with more than three pontics <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>and we call it our trade mark bubble <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" /></p><p></p><p>please help</p></blockquote><p></p>
[QUOTE="jijimon, post: 85302, member: 5651"] we had a 11 unit bridge case today 14-13-12-11 21-22-23 24-25-26-27 3 pontics 24-25-26 as usual i connected sprue to all the teeth also fixed some extensions which look like reservoirs to the buccal side of the pontics invested preheated 1050 degrees ( ring only) flame casted using non precious alloy in semi automatic centrifugal casting machine:mad2: casting looked fine allowed to cool down in room temprature devested using air chisel sand blasted and i found a small bubble between the connection 25-26 i tried to remove it with tc burs and finds the bubble is getting bigger :mad: some how i managed to clean the bubble and soldered it :cool: but this happens to us almost every time we did a long span bridge with more than three pontics :confused: and we call it our trade mark bubble :o please help [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Metal
bubble in pontic in pfm bridge
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