Composite Bonding Compared With Amalgam Fillings Strength

How Strong Is Composite Bonding?

Composite bonding uses a tooth-coloured resin that is shaped directly onto the tooth. Once hardened, it becomes firm enough for normal biting and chewing. It also bonds to the tooth itself, which gives the dentist a way to rebuild part of the tooth without relying only on the filling material sitting inside the cavity.

But composite isn’t indestructible. A large restoration on a back molar takes more pressure than a small repair on a front tooth. If you’re someone who regularly bites your nails or crunches ice, I’d be much less enthusiastic about pushing composite to its limits.

Where Composite Works Best

• Small cavities are a good match, especially when the remaining tooth is still fairly strong.

• Front teeth often suit composite extremely well because strength and appearance need to work together rather than compete.

• Large back-tooth restorations need more thought. The filling has to cope with repeated chewing pressure, and that changes the decision.

Is Amalgam Stronger?

Traditionally, amalgam has had a reputation for being the tough option. There’s a reason for that. It has been used for many years in areas that take serious chewing pressure, particularly on back teeth.

So yes, amalgam can be very durable in the right situation. But strength isn’t the only thing that matters. Amalgam doesn’t bond to the tooth in the same way composite does, and placing it may require removal of more healthy tooth structure to create a suitable shape for the restoration.

Which One Should You Choose?

If the tooth has a modest amount of damage, composite bonding is my preferred option. It preserves the natural tooth structure while giving you a strong, tooth-coloured repair that doesn’t stand out when you smile.

But a heavily damaged molar is different. If a large amount of tooth has been lost, the dentist needs to think about how much natural structure remains and how much force that tooth receives every day. Sometimes a different restoration makes more sense than either a simple composite or amalgam filling.