Re: Tooth crack

Newbie wrote:

On Tue, 27 Feb 2007 15:07:23 GMT, Mark & Steven Bornfeld <bornfeldmung@xxxxxxxxxxxxxxx> wrote:


Amatus Cremona wrote:


How can I tell the difference between crack and craze lines? How do
these crack lines form? Does loss of one tooth produce too much
pressure hence crack lines on other teeth?



Your dentist should be able to tell if these are surface crazing lines, or deep fracture lines.

These are all the result of "parafunctional" activity. That means activity which is not associated with normal function of the organism. In this case, we are discussing forceful clenching with isometric grinding (grinding forces without actually moving the teeth across each other). Most often this a sleeping occurance which the patient can not detect they are doing until a dentist points out the damage.




I have routinely seen these radiating out from amalgams of various signs with absolutely no other signs of parafunction. Not saying that just because I can't see it means it ain't there--but considering the well-known setting expansion of amalgam, together with differences in coefficients of thermal expansion between tooth structure and restorative materials, I think it might be overdoing it to say that "all" cracks should be considered the result of parafunction.

Steve



Also there is the occurrence of microfracturing cause by
the bur itself. 557's are notorious for causing these fractures
Quit using them shortly after starting to use magnification.
Could actually see the fractures (craze linew) as they were
being caused.



I've heard this and it seems to make sense. Perhaps I'm just not looking closely enough.

Steve

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

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