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Lab talk, the good, the bad, and the ugly
Porcelain
cracking porcelain on long span bridge
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<blockquote data-quote="labguy5381" data-source="post: 199382" data-attributes="member: 10040"><p>I have a porcelain cracking question to pose. Attached are photos of a large anterior case. The porcelain on this case cracks horizontally across the entire lingual and some interproximal and buccal. It is not a crack across the incisal edge indicating too much unsupported porcelain at the incisal edge. It is multiple cracks across the middle third of all of the pontics. While these cracks were somewhat evident in the initial firings, the real problem occurs in the glaze. The case continues to crack over time. Under the microscope there does not appear to be contamination in the metal. The surface of the metal looks quite good. The opaque was (and still is) well bonded to the metal. Notice that this is a large bridge with only 4 abutments. The whole anterior section is edentulous. This is 7 pontics supported by only two abutments on each end. I don't like it, but it is the hand we were dealt. So, the question is...how would you do this case to prevent the cracking? I have a theory, but I would love to hear your experience on this problem. </p><p></p><p>Thanks for your help,</p><p>Jim</p></blockquote><p></p>
[QUOTE="labguy5381, post: 199382, member: 10040"] I have a porcelain cracking question to pose. Attached are photos of a large anterior case. The porcelain on this case cracks horizontally across the entire lingual and some interproximal and buccal. It is not a crack across the incisal edge indicating too much unsupported porcelain at the incisal edge. It is multiple cracks across the middle third of all of the pontics. While these cracks were somewhat evident in the initial firings, the real problem occurs in the glaze. The case continues to crack over time. Under the microscope there does not appear to be contamination in the metal. The surface of the metal looks quite good. The opaque was (and still is) well bonded to the metal. Notice that this is a large bridge with only 4 abutments. The whole anterior section is edentulous. This is 7 pontics supported by only two abutments on each end. I don't like it, but it is the hand we were dealt. So, the question is...how would you do this case to prevent the cracking? I have a theory, but I would love to hear your experience on this problem. Thanks for your help, Jim [/QUOTE]
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Lab talk, the good, the bad, and the ugly
Porcelain
cracking porcelain on long span bridge
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