Re: Strength of a filled tooth?

The volumetric change due to expansion of amalgam is less than the
volumetric change due to shrinkage in resin. So, the resin should fracture
more teeth than the amalgam does.

--
/

Amatus

/
"Mark & Steven Bornfeld" <bornfeldmung@xxxxxxxxxxxxxxx> wrote in message
news:Qf%Vi.8632$R%4.375@xxxxxxxxxxx
Amatus Cremona wrote:
And cracks in the tooth can weaken it more than the size of filling does.


Well, sure. All other things being equal, the tooth with more structural
loss (and correspondingly bigger filling) is going to be more likely to
crack. Of course, if there are cracks before the filling is placed, you'd
like to know about it.
Many would say that amalgam would cause more fractures because of setting
expansion. I'm not so sure, but the cracks are more likely to separate
since they are generally not bonded.

Steve

--
Mark & Steven Bornfeld DDS
http://www.dentaltwins.com
Brooklyn, NY
718-258-5001


.

Relevant Pages

  • Re: Strength of a filled tooth?
    ... the resin should fracture more teeth than the amalgam does. ... I'm not brave enough to do large resin fillings like Fawks, so I don't see that many fractures in the teeth I do resins in. ...
    (sci.med.dentistry)
  • Re: Teeth drying out due to fillings?????
    ... It is clear to me that some fractures start in the dentin, and those under amalgam frequently start that way. ... What was dispersed was small particles of copper, which improved the mechanical properties at the margin. ... I will be more aggressive about changing a questionable restoration in a patient who comes in for a checkup every 10 years or so whether they need to or not than I will for a patient who religiously keeps their 6 month appointments. ... There should be a reason for replacing a filling--decay, fracture, patient thinks the filling looks bad. ...
    (sci.med.dentistry)
  • Re: Distal cusp broke on back molar
    ... > Another acceptable type of restoration would be an onlay-- ... ceramic or perhaps lab-cured resin. ... > likely hold up well even if a full cusp weren't constructed. ... a sizable amalgam (covering most of the mesial-occlusal-lingual ...
    (sci.med.dentistry)
  • Re: Silver vs. Amalgam fillings
    ... If a large amalgam is place <silver filling> this tooth ... It was a resin filling. ...
    (sci.med.dentistry)
  • Re: How do amalgam fillings work?
    ... The dimensional change is much less than that of even the best composite resins, but it cannot be bonded effectively (the Parkell company on Long Island was claiming for a while that their product "amalgambond" could bond amalgam, but I have my doubts about that--I can't even conceive of how that would work. ... I once had an amalgam filling that was put into a cracked tooth where half the tooth in the back was missing. ... Undoubtedly this is because there are so many factors involved in longevity of a filling, fracture of teeth, etc. ... In these cases, it is impossible to tell if the fracture has occurred as a consequence of amalgam expansion, or of leaving what's called "unsupported" amalgam in the prepared tooth. ...
    (sci.med.dentistry)