On Jun 27, 9:58 am, churin <krone8...@mypacks.net> wrote:
> I had metal crown on molar(#31)but it lasted about ten years. A part of
> the top surface area was removed and cement underneath was exposed. The
> broken crown was replaced with again a metal crown. This time it lasted
> only one year. The damage was done in the same way as the previous one.
> I chose metal crown because the both dentists who did the first one and
> second one recommended metal crowns.
>
> I still keep the removed crown which lasted 10 years. It really looks
> "worn out" and appears badly deformed from the original shape. It looks
> as though the opposing porcelain bridge struck hard on the metal crown
> which appears softer than porcelain so that it yielded to the impact by
> deforming itself.
>
> Now I have to decide for a new replacement crown whether to go for metal
> crown again or switch to porcelain.
>
> My question:
>
> What is typical life of a metal crown on molar?
> What is a downside(s) of porcelain(PFM), cosmetic aspect aside?
> Any suggestion for choosing type of crown?
It sounds as though it might have been a cheap stainless steel crown.
We call those "temporary."
But even a cast metal crown (much better than stainless steel pre-
formed) can eventually be worn through by harsh contact from an
opposing porcelain bridge.
Generally I like to make a crown of a material similar to that which
it's going to occlude against (bite against).
So if there are no other confounding factors, generally if the tooth
is going to bite against a porcelain bridge, I like to place a
porcelain crown to match.
- dentaldoc
Steven Fawks
Amatus Cremona
