Re: Fibre Posts


"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



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. ... Its thinner there as Steve Mancuso alludes to, and its weakened by the lack ... >> cap that forms encirclement around something (pole, shaft, tooth, etc). ...
    (sci.med.dentistry)
  • 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)
  • Re: Fibre Posts
    ... > tooth structure and end up with a thin sliver of tooth holding everything ... In the cases where a ferrule leaves a lot of thickness (of ... >dentin walls holding the whole thing together. ... The long prybar is forcing the root apart. ...
    (sci.med.dentistry)
  • Re: Fibre Posts
    ... tooth structure and end up with a thin sliver of tooth holding everything ... In the cases where a ferrule leaves a lot of thickness (of tooth ... the root will break. ... >>>But it prevents root fractures when there's a post. ...
    (sci.med.dentistry)