When a cavity needs filling, there are two basic choices. There is a mixture of metals called an amalgam. Or, a resin composite, consisting of ceramic or glass, blended in a plastic compound. Each has its pros and cons.
Because resin more closely matches the colour of natural teeth, they tend to be less noticeable. This has made them popular. Plus, due to the flexibility of composites, they generally require less drilling.
Once the decay has been removed and the surface prepared, the composite will be laid down in layers. A special light is used to harden each layer. After final shaping to insure a proper bite, the composite filling is polished.
The downside? Composite fillings don’t tend to last as long as amalgam fillings. Additionally there have been some concerns about composites releasing toxic elements as they age. Until there is greater clarity, we’re keeping an eye on the scientific literature.
