You should allow them to redo your CEREC, there are a multitude of materials to choose from....AND there are multiple versions of CEREC software in use. Make sure they are using a current machine with current software. The marginal fit of CEREC is no longer an issue with a properly imaged preparation and proper tooth preparation. You are just as likely to get crowns requiring adjustment from a lab.
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Posted to Cerec V. Lab Crown - Alabama on 12 Apr 2012