>>> 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
