Most of us are ready to move on from the use of mercury amalgam fillings, which are bad for your appearance, bad for your health, and bad for the environment. But the last possible argument in their favor is that some people believe
Most of us are ready to move on from the use of mercury amalgam fillings, which are bad for your appearance, bad for your health, and bad for the environment. But the last possible argument in their favor is that some people believe they are more durable than composite fillings.
Now a new study shows that composite fillings are at least as durable as mercury amalgam fillings, and may be much more durable in the long-term.
A Large Database Analysis
For this study, researchers looked at data from the University of Pittsburgh School of Dental Medicine Registry and DNA repository. The study included data from 807 patients over a 10-year period. These patients had a total of 8276 fillings, 2010 of which were composite fillings. They looked at the five-year survival rates of the fillings. For this study, a filling was only considered to be failed if it needed to be removed and replaced with a new filling.
For both types of fillings, reasons for removal included fracture, secondary decay, or discoloration for composite fillings. Oxidation of amalgam fillings or discoloration of the tooth were not considered reasons for failure of mercury amalgam fillings, which definitely makes it easier for mercury amalgam fillings to remain “successful” over time.
Comparable Failure Rates
Despite the higher standard for failure in composite fillings, the two types of fillings had comparable failure rates during the first and second years after placement, but after that, the composite fillings actually performed much better. The failure rates for fillings were:
- First year: 9.76% (amalgam) vs. 9.85% (composite)
- Second year: 2.14% vs. 2.88
- Third through fifth year: 3.24% vs. 1.19%
- Cumulative failure: 15.14% vs: 13.92%
Statistically, the failure rates were comparable, except during the final years of the study, where the composite resin fillings performed much better, speaking well to the long-term survival rates of the fillings.
There Is No Reason to Continue Using Mercury Amalgam
With the results from this study, which had a large population monitored over a fairly long period, the last potential justification for using mercury amalgam fillings has been discredited. Now we know that there is, officially, no reason to keep using mercury amalgam