My crown has fallen off 3 times. I have returned to him again and he says I need a gingivectomy to keep the crown secure by giving the crown more tooth area to bond the crown. This sounds extreme to me. Also the base of my tooth is blackened where I recall it was not when he placed the crown the last round. I’m holding the loose crown now and need to decide soon!
– Nancy from San Francisco
(See Dr. Hall’s answer below.)
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The procedure is called crown lengthening—trimming the gum and maybe some of the bone to expose more of the tooth so that it can retain a crown. Sometimes that is necessary, and I had occasion to do that in my practice.
My problem with your situation is that your dentist should have known up front that crown lengthening would have been required to retain the crown. Coming to you after the crown has fallen off three times makes me not trust him. Did he not realize when he first prepared your tooth that crown lengthening would be required? Or is it that crown lengthening isn’t actually required in your situation and this is just an excuse he is giving you?
It is possible to do a crown on a short tooth and have it stay on without doing crown lengthening and without having any problem. But the tooth has to be carefully prepared with only a very slight taper and possibly cutting some grooves into the sides of the tooth. I have a blog post about crown retention form that you can read here. It cuts into the excuses that many dentists use to explain why their crown fell off. In over twenty years of practice, I never had one of my crowns fall off, because I always prepared them with a tight draw. Many dentists don’t like to prepare a crown with a tight draw because it is more demanding and even a slight error can mean that the crown won’t fit at all.
It is when a tooth is “bombed out” with most of the crown either broken off or eaten away by decay that crown lengthening is required.
Bottom line—I wouldn’t trust this dentist to try again and would get a second opinion. He’s clearly planning to do a new crown for you, so I’d have another more expert dentist do it. I don’t know what the blackening of your tooth is, but something doesn’t sound right about that either.
Oh, and I think your dentist should refund you AND the insurance company, if insurance was involved. If he doesn’t, I’d complain to the dental board and to the insurance company. A crown isn’t serviceable if it won’t stay on, so there should be no fee for it.
– Dr. Hall
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