Re: One more crown falls out

I think crowns fall off due to:

1) caries (decay)
2) trauma
3) hypererruption (tooth raises out of socket due to underlying infection)
4) bad preparation
5) tooth is too short
6) occlusion is terrible
7) moisture contamination during cementation
8) fracture of an all porcelain crown
9) improper rest preparation or design on an RPD abutment
10) bizarre case of bad luck

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Amatus

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"jwn dds" <jnelson5@xxxxxxxxx> wrote in message
news:5K7Ne.206858$tt5.112749@xxxxxxxxxxx
> Just saw a patient about 20 minutes ago that had a crown "fall out".
> Caries were the reason. Are you still brushing and flossing?
>
>
> <OneGoodGuy@xxxxxxxxxxxxxx> wrote in message
> news:n548g119ia28livgafkmkm9535rkhv054c@xxxxxxxxxx
>> In the long on-going saga (see previous thread: Yet another crown
>> question) I've just lost another one. Actually it's still there, just
>> wedged in between adjacent teeth and pointing towards and rubbing
>> against my cheek. I suppose I could use a pair of Craftsman needle
>> nose pliers ... <g>.
>>
>> Well, while pondering this further punishment in life it occurred to
>> me:
>>
>> When I grind my food my lower jaw works to make circles and to move up
>> and down. Why then are molars not flat? Surely as the bottom teeth
>> move (say) left to right the raised parts will encounter the downward
>> pointing tooth placing lots of lateral strain (even a blow) on the
>> upward pointing nub and even the upper tooth? Worse, if any of the
>> teeth are uneven in their contact points (say: the first molar is
>> slightly higher that the second) then one or other will take a real
>> beating. Hmmm, it's amazing that any of them survive.
>>
>> Presuming that the answer is that you (the dental people) make lots of
>> effort to see that there aren't too many impacts, could it be that the
>> reason I'm getting so many crowns coming out is that my dentist hasn't
>> done enough in this regard? Agreed the bonds are weak and the teeth
>> are fragile but that's even more of a reason to make sure that the
>> teeth can't impact each other.
>>
>> One other question on the same line. When I grind (lightly) my teeth I
>> can hear (or feel, I'm not sure) a noise like a finger rubbing across
>> a smooth but not slippery surface such as glass. I presume it's caused
>> by the continuous breaking of the tension between the finger and the
>> glass. What's this noise called?
>>
>>
>
>


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