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Broken crown and post

User Level:
Posted by: ZitInMyGum  (10 years ago)

Hi all!

Despite taking great care of my teeth, I still get cavities. I have very soft teeth and they are prone to decaying. Six months ago, I have had one root canal and three crowns. Last week, the crown from the root canal treated tooth fell off. The dentist told me that the post and crown from the root canal were broken. He re-cemented the crown and referred me to an orthodontist.

The orthodontist told me that he found decay underneath the crown. He drilled and cleaned the decay out and put a new post in to replace the broken one. Why would I have a decay unnoticed underneath the crown in just about six months? My regular dentist did not even see it.

Before I left the orthodontist’s office, he said I would need to get an implant or bridge sometime in the future because the crown is not going to hold for very long. Any ideas what happened? Why the new post does not have enough tooth to hold onto now? Did he drill too much in gum? Please advise me! I cannot afford an implant or a bridge this time. Thank you in advance for any information you could give me.
User Level:
Posted by: ghnane  (10 years ago)
One of the reasons why the dentist said your crown won't last long is the shape and how much tooth structure you have left under your crown. There are ideal preparation guidelines such as having parallel walls with as less taper as possible however tooth preparation also depends on the shape and position of teeth along with decay extent.
The decay under the crown is called recurrent decay. Perhaps the crown did not properly seal the tooth.
I am a little confused as to why an orthodontist would go ahead and fix your crown along with drilling and post. That is your general dentist's responsibility.
Continue to brush and floss twice daily and use Fluoride containing mouth rinses. MI paste may also help you with preventing cavities. MI paste is by prescription from your dentist.
I hope this helps.