Types Of Fillings
The ultimate tendency is about amalgam filling and mercury. Why do we actually choose composite dental filling over metal amalgam dental filling?
For some people the answer is the absence of mercury. For me there are more important reasons for this decision.
First the amalgam metal filling does not stitch to the tooth. There is no adhesive part. The metal is inlaid and retained due to the tooth preparation, its retentive form. The metal cannot be stitched to the tooth. That means that the edge of the restoration seals the tooth mechanically. In some years this edge can break due to the masticatory forces and saliva begin to filtrate inside of the preparation. Cavity can begin and most of the cases without any pain. Person does not perceive any change and the problem continue till root canal treatment is needed.
Another problem due to the absence of the adhesion is that every time the person bites the filling gets down and always tries to break the tooth. This problem is very important because produces cracks on the tooth. The metal filling works as a wedge that fractures the tooth. Most of this crack have to be treated with the full coverage crown, and in some times when the crack is very deep and goes under the gum, there is no way to restore the tooth and tooth extraction and posterior implant placement has to be done.
Composite dental fillings are tooth bonded in all their surface. The dental composite filling is a resilient material, so it works more likely as dentin. If the edge breaks there is a big surface of the filling that is stitched to the tooth and does not let saliva to get in.
And off course a big plus is aesthetics.
Now a days composites are a very long lasting materials and there is no reason to choose to have a metal filling.
Dr. Natalia Demianko
DDS / 2015