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     A patient came in the other day with an emergency. She had fractured a molar crown. I quickly looked it up in her records and confirmed my fears.  Yes, it was one of mine.  I had placed the crown just a bit less than 2 years ago.

     Why did it break? Insufficient prep?  Occlusion too heavy in excursive movements? Lab problem – voids in the porcelain? Patient chewing on rocks?  Bad karma?  Just…

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