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Medical Forum / General / Dentistry / February 2007Tooth crack
I found some cracks on the edge of my back teeth and searched on internet. I think they might be so-called "craze lines". Because I don't have pain on these teeth. 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? > 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.  Signature/ Amatus / >>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 [quoted text clipped - 9 lines] > 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 SignatureMark & Steven Bornfeld DDS http://www.dentaltwins.com Brooklyn, NY 718-258-5001 Remember that all but the very newest composites expanded thermally,more than amalgams did on oxidization. The resins just start to decay before the fractures appear. The alloy keeps trying to reseal through oxidation. Signature/ Amatus / > >>>How can I tell the difference between crack and craze lines? How do [quoted text clipped - 20 lines] > > Steve How can lots of mine still work after 20+ years? D The resins just start to decay before the > fractures appear. Not saying they don't last, I am pointing out why the ones that fail often do not show the same radiating fracture lines in the parafunctional patient. Signature/ Amatus / > > How can lots of mine still work after 20+ years? [quoted text clipped - 3 lines] > The resins just start to decay before the >> fractures appear. >>>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 [quoted text clipped - 19 lines] > >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. >>>>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 [quoted text clipped - 25 lines] > 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 SignatureMark & Steven Bornfeld DDS http://www.dentaltwins.com Brooklyn, NY 718-258-5001 >>>>>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 [quoted text clipped - 30 lines] > >Steve It seems to be caused by the sharp angle where the end cutting portion of the bur meets the side cutting portion. Seems to be straight fissure and straight fissure cross-cut as the worst offenders. I don't use them any more, and tend to 'section' an old restoration rather than grind it out. Am using 331L and 331's as my workhorses. Personally, I have never used cross-cut fissure burs to cut teeth. (Except for surgical burs.) I like burs to shatter amalgam out of prep's, and diamonds to refine the walls. Burs tend to vibrate a bit. You can use that vibration to help "chatter" an old restoration and get out of the prep without having to grind against the walls of the tooth. Just switch to a diamond after all the old stuff is out. Signature/ Amatus / > >>>>How can I tell the difference between crack and craze lines? How do [quoted text clipped - 30 lines] > Could actually see the fractures (craze linew) as they were > being caused. |
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