One of the trickiest aspects of crown preps is cervical extension. Dentists are scared to extend the prep sub-gingivally for fear of invading the biologic width but end up short more often than not like in this case:
The crown was cemented by another dentist 2 years ago but the patient came to see me as an emergency because the crown had come off 3 times and the patient was not happy with that.
I recommended replacing the crown, and also the one on #14, and the patient agreed. I like to make sure that the refined prep has addressed the issue for re-doing the crown and hence I like to take a bitewing of the temp before I cement it.
The mesial margin was slightly open and so I was able to seal it but you can appreciate the adequate cervical extension of the prep on the distal.
Bottom Line: Ensure adequate extension of the crown prep cervically. Take BW when in doubt to ensure same!
The crown was cemented by another dentist 2 years ago but the patient came to see me as an emergency because the crown had come off 3 times and the patient was not happy with that.
I recommended replacing the crown, and also the one on #14, and the patient agreed. I like to make sure that the refined prep has addressed the issue for re-doing the crown and hence I like to take a bitewing of the temp before I cement it.
The mesial margin was slightly open and so I was able to seal it but you can appreciate the adequate cervical extension of the prep on the distal.
Bottom Line: Ensure adequate extension of the crown prep cervically. Take BW when in doubt to ensure same!
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