The answer is sometimes. In my New York dental practice, if a patient comes in with a crown that has come out I carefully inspect the tooth and the inside of the crown. I look for recurrent decay on the tooth structure holding the crown. If the crown has decay around the margins of the crown it is usually a bad idea to recement the crown after removing the decay since it will not fit properly.
I also look inside the crown to see whether the cement remains inside of it or has it experienced " cement wash out". If the inside of the crown has black stain it probably indicates that the crown was "leaking" for some time prior to coming out.
If the tooth is ok and not decayed, I remove all the cement inside the crown, sandblast the internal part and use GC fitchecker to check its fit. If I like the fit I take a check radiograph and if it seems appropriate I will recement it with a permanent cement.
Sometimes recementation works well, but other times the crown can come out again. This can happen because the crown as it was fabricated doesn't have sufficient retention to stay in permanently.
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