>> 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
