Re: Fibre Posts


"Vaughn" <vaughnsimonHATESSPAM@xxxxxxxxxxxx> wrote in message
news:FGd5e.51801$cg1.50755@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> "NOYB" <noyb@xxxxxxxx> wrote in message
> news:gtd5e.1796$go4.337@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> >> Shovels always break at the ferrule.
> >
> > No. They break above or below the ferrule.
>
> Unlike many dentists, (Steve being an exception I know of) I have
used a
> shovel professionally. Over the years, I have broken enough to know where
they
> break. In fact, I believe I have the remains of one in my backyard right
now if
> someone would like to study a case in point. They always break at, (or an
inch
> or two inside) the ferrule.
>
> What that has to do with teeth, I will leave to you nice folks to
debate.
>
> Vaughn
>
>

REPLY

Good observation. The same thing happens with the tooth ........ that is
except where the post itself causes the root to split.

A conical root tapers as it proceeds apically (towards the apex or tip).


Its thinner there as Steve Mancuso alludes to, and its weakened by the lack
of nutrients within the odontoblasts .......


Joel


>
> A ferrule is a metal ring or
> > cap that forms encirclement around something (pole, shaft, tooth, etc).
If you
> > don't create a ferrule effect around a tooth with a post, then the post
gets
> > all of the lateral stress from occlusion and transmits it down the canal
> > space.
> >
> >
> >
> >
>
>


.

Relevant Pages

  • Re: Fibre Posts
    ... >> Shovels always break at the ferrule. ... They break above or below the ferrule. ... (Steve being an exception I know of) I have used a ... > cap that forms encirclement around something (pole, shaft, tooth, etc). ...
    (sci.med.dentistry)
  • Re: Wire rope question
    ... >>> Then how do I get it through the tight ferrule? ... >>> You might try reading the entire first post. ... >>> Steve ...
    (sci.engr.joining.welding)
  • Re: Wire rope question
    ... >> Then how do I get it through the tight ferrule? ... >> You might try reading the entire first post. ... Steve ...
    (sci.engr.joining.welding)
  • Re: Fibre Posts
    ... > cutting away all of that extra core material while prepping the crown. ... That's the point of the ferrule. ... >>> the post first contacts the tooth. ... >> If a weaker fulcrum is further out along the lever arm than the stronger ...
    (sci.med.dentistry)
  • Re: Fibre Posts
    ... > But crowns don't snap off the tooth at the height of contour. ... If your crown prep does not extend epically beyond the height of contour, ... >>> The internal stresses are enormous without the ferrule effect. ... >>> in compression. ...
    (sci.med.dentistry)
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