On Jul 1, 12:38 pm, churin <krone8...@mypacks.net> wrote:
> Mark & Steven Bornfeld wrote:
>
>
>
>
>
> > churin wrote:
> >> Bill wrote:
> >>> 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.
>
>
> >>>> 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.
>
>
> >> How can I make sure that I get a quality crown whether it is metalic
> >> or porcelain? Does it entirely depended upon a dentist I go to? Is
> >> there anything I can do to help getting better crown?
>
> > Not easy. Amatus can place a crown or inlay in a day (one long visit
> > with a break) but most of us send impressions to a lab, so it will
> > require multiple visits. Of course, even here the quality is dependent
> > on both the dentist and the lab. The dentist should be able to discuss
> > the materials to be used. You should be able to discuss this problem of
> > chewing through the crowns, and formulate with your dentist a plan to
> > minimize having this happen again. For me, unwillingness to discuss
> > these issues in a respectful and comprehensible manner should be an
> > automatic disqualifier to using the dentist for your treatment.
>
> > Steve
>
> Thanks for your suggestion.
>
> churin- Hide quoted text -
>
> - Show quoted text -
Please do remember that when you place a crown into occlusion (bite)
against an opposing crown that is made of a DIFFERENT material,
eventually the harder material will grind down the softer material.
That's why dentists frequently see porcelain bridges wearing away the
opposing teeth and opposing gold crowns.
If you grind your teeth, the wear is even faster.
My advice is to make sure that the opposite crowns match each other.
- dentaldoc
Steven Fawks
Amatus Cremona
