My crown's keep comming off
joe
build ups in my mouth. In December one came off. I went back to the
dentist and he cemented it back in. In January the other crown came
off. Again I went back to the dentist and he cemented that one back
in. Last night the first crown came off again. I went back to the
dentist and he cemented it back in. My dentist is not a hack, I know
other people who use him and have no problems with their crowns. I
asked him why this keeps happening these things are supposed to last
years. he said this has never happened to him before. I don't know
what I should do. Any suggestions?
Anonymous
2. Short abutments for crowns, due to little remaining tooth structure
or decreased vertical dimension.
3. Poor cement selection.
joe wrote:
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Roy Brown
A hidden "wiggle" factor.
"Anonymous" <anon...@anonymous.anonymous> wrote in message
news:3C90180B...@tld.net...
Steven Fawks
:-)
Fawks
Mark & Steven Bornfeld DDS
buildups stay in the teeth?
I'm a little suspicious that he said he's never had a crown fall out.
And he shouldn't be at a loss for what to do.
Steve
--
Mark & Steven Bornfeld DDS
Brooklyn, NY
718-258-5001
http://www.dentaltwins.com
Otto A. Horger_Jr.
"Roy Brown" <royb...@on.aibn.com> wrote in message news:<5zUj8.53957$hb6.2...@news20.bellglobal.com>...
DrCnBseen
Poor fit
Improper cementation technique
Destructive habits
MissM2869
dental assistant
oca
serious. I ask because this happened to me a couple of weeks ago. The
surgeon put the abutment back in. Shaved some of the crown in the
back, since he said I had a bad bite and that could've been the
problem. Now I am so careful of my crown.
Mark & Steven Bornfeld DDS <born...@dentaltwins.com> wrote in message
news:<3C90CD63...@dentaltwins.com>...
Mark & Steven Bornfeld DDS
usually try using a strong resin cement like C&B Metabond and that will
usually do the trick.
If the post comes out, there is frequently fractured tooth structure
that comes out too. In this case the crown margins no longer seal at
the gumline. Also, if the post wiggles out too, it frequenly means
there is insufficient ferrule effect (where the margin of the crown
encircles sound tooth structure further down the root than the cut end
of the tooth). I have tried to save these too. Usually they just come
out again.
Just this week I saw a patient where I had recemented a post and crown
with C&B Metabond. It loosened up again, but this time because the
steel post fractured off in the root. Now, if we are to have any hope
of saving this tooth, the endodontist will have to be able to remove a
long fractured steel post from the root. Having cemented this with C&B
Metabond, I'm not optimistic this can be done.
This doesn't mean I think the dentist did anything wrong, and as I said
this has happened occasionally to crowns I've made. You don't always
know how much ferrule is enough, until you find out you don't have it.
What should be done in this case (if the remaining root is
periodontally healthy and restorable, is that a new post should be
placed, and the root must be re-prepared so that the crown encircles
more of the sound root structure. Frequently this will require crown
lengthening, a surgical procedure.
Hope this helps,
Steve
--
Mark & Steven Bornfeld DDS
pudge
No more decay.
That was my solution to similar problem.
...from the chair.
Pudge
Dr. Steve
I think (me personally here) that we were misled in school regarding the
amount of remaining tooth structure needed to justify full coverage cast
restorations.
We were taught that if we had a 2-3 mm ferrule at the cervical portion of
the tooth, we could engage this area with our casting, and that we would
have long tern success.
After 18 years of doing this (not counting dental school clinic), I no
longer think this concept is valid. I have seen far too many broken teeth,
where the crown snaps off the root stump leaving 4-5 mm of ferrule inside
the crown.
The consistent factor I have seen is the width of the residual tooth
material in this "ferrule region". The broken teeth all have very thin
"shells" of tooth on which the crown was finished. The beautifully done
cores (amalgam, composite and/or gold) were all nicely attached to the
inside of the casting. I always had to grind the cores to get them out of
the crown, so I could temporize the crown back on the tooth. We have all
done wonderful cores with great retention, then gone ahead and prepared the
tooth for the casting with the core in place. The problem has been that we
now cannot see the thickness of the tooth in this "ferrule area". We seek
perfection (like we were taught) and prepare lovely finish lines in the
"ferrule area". Only thing is,,,,,,,, we cut the only strong portion of the
tooth down to the approximate thickness of egg-shell. We are setting up
these teeth to fail later on.
A "short-crown" bonded to the tooth without reducing the thickness of the
cervical third of the clinical crown makes a lot more sense to me.
In addition, the "short-crown" would reduce the incidence of abfraction
lesion we see at the margins of full cast crowns. With the full cast crown,
all the flexion of the tooth is limited to be between the crown margin and
the crest of the alveolar bone. The tooth flexes more in this narrow band,
and abfraction begins. With the "short-crown" concept, the tooth is free to
flex along more of its vertical height. This flexing pressure is more
spread out and the potential for abfraction lesion is less. We see teeth
every day (in our practices), where abfraction has caused what seem to be
open margins on the facial aspect of full cast crowns. How much energy do
we spend each year just trying to extend the life of these crowns, (or
re-doing them)?
And, please Mrs. Ralph, this is a theoretical debate, not a statement of how
your crowns should be done in your own mouth.
Steve
--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Stephen Mancuso, D.D.S.
drs...@home.msen.com
Troy, Michigan USA
+_+_+_+_+_+_+_+_+_+_+_+_+_+_+_+
This posting is intended for informational or conversational purposes only.
Always seek the opinion of a licensed dental professional before acting on
the advice or opinion expressed here. Only a dentist who has examined you
in person can diagnose your problems and make decisions which will effect
your health.
......................
"Mark & Steven Bornfeld DDS" <born...@dentaltwins.com> wrote in message
news:3C98E211...@dentaltwins.com...
Steven Bornfeld
ferrule area. Also I can easily understand how short crowns would be of benefit
here.
I'm not as sold on abfraction as a problem as you and Steve Fawks are,
though--but I'm not ready to discount it.
Steve
Dr. Steve
in cases where I previously would have done a core build-up and a full
coverage crown. After over a year of machine milled porcelain bonded
onlays, I am very confident with this technique.
--
+=_-+=_-+=_-+=_-+=_-+=_-+=_-+=_-
Stephen Mancuso, D.D.S.
Troy, Michigan USA
drs...@mancusodds.com
sma...@home.msen.com
~~~~~~~~~~~~~~~~~~~
"Steven Bornfeld" <mars...@netzero.net> wrote in message
news:3C9BA0C0...@netzero.net...
Mark & Steven Bornfeld DDS
choices are determined by reason and practical experience, rather than what has
been spoon-fed to us!
Steve