>>>>> 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
