Sunday, April 7, 2013
One of the most asked questions in our office is: "Will my filling/crown last forever?!?"
No matter how strong a material is, it is as strong as the weakest material surrounding it.
Sometimes, it is the tooth itself that fails. Teeth can decay, crack, fracture... This would unfortunately lead to failure of the restoration.
The filling material and its bonding agent (glue that keeps it in place) can also fail due to material fatigue. Material fatigue is a progressive and localized structural damage that results from repeated cyclic loading of an object. We chew on average 1,500 times per day. Add to that the abuse from teeth clenching and grinding, ice &/or gum chewing, nail biting (or ear biting in the case of Mike Tyson) etc... Like teeth, fillings will wear down.
Last month, we had a case of a failing tooth colored (composite) filling.
1. She felt pain when the pressure was specifically placed on the filling on tooth 2.6 (14 for US dentists)
2. A gap was felt between the filling and the tooth indicating an open margin
There is likely failure of the bond between the filling and the tooth (the glue that links the filling to the tooth)
The filling needs to be replaced.
We started by numbing the tooth and isolating it with a rubber dam. It is an important step to avoid contaminating the area. One of the main reasons why a tooth colored filling fails prematurely is if a film of saliva ends up on the tooth surface while the filling is being placed. That film will compromise the longevity of the filling by weakening the strength of the bond between the materials and the tooth.
|After the filling was replaced|
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Labels: ali Mehio, bruxism, clenching, dentist, dentist in downtown vancouver, dentist in vancouver, dr Mehio, failing filling, Mehio, replacement, restoration, tooth sensitivity, will my filling last forever