> 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
