Composite resin fillings are made of ceramic and plastic compounds. Because resins mimic the appearance of natural teeth, these fillings have been used in front teeth for years. When they first appeared, however, resin compounds weren’t strong enough to be used in back teeth, where high-pressure grinding and chewing require greater durability.
In the past 10 years, technology has improved enough to allow the use of resin material in posterior or back teeth.
- With more durable resin material available for only a decade, resins haven’t stood the test of time in teeth where grinding and chewing result in heavy wear; by contrast, the durability of amalgam fillings is well documented — the average life span of amalgams is 8 to 10 years, but many last 20 years or more