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Cavities were once typically filled with a silver compound called amalgam, which was used because it was strong and could repair areas weakened by tooth decay. In recent years, composite resin has become more popular as the material used for dental fillings. It serves the same purpose, but provides other benefits that amalgam does not. Some people not only choose composite resin when getting new fillings, but also have metal (or amalgam) fillings replaced with composite resin.
Why replace metal fillings?
The main reasons that patients consider replacing their metal fillings include:
- Tooth sensitivity – some patients complain that they feel discomfort near their metal fillings when eating cold foods.
- Concerns about mercury – there is a common but untrue belief that the mercury levels in metal fillings might be poisonous. Researchers have proven this to be false, reporting that metal fillings are safe.
- Inadequate bonding – due to the makeup of metal fillings, sometimes they do not fully bond to the tooth and need replacing to treat the cavity most effectively.
- Additional decay – if old fillings develop more decay or break, it is necessary to have the filling replaced. Patients may choose whether to replace the metal filling with composite resin, or to have a metal filling placed in the tooth again.
Are there benefits to using composite resin?
The main benefit of composite resin is that it can be colored to match the surrounding teeth perfectly. Many patients choose this option because it is aesthetically pleasing, with fillings often being unseen. Also, composite resin fillings require less tooth area to be removed. This allows dentists to keep as much of the original tooth as possible. Another benefit is that composite resin fillings do not change shape or crack.
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