Amalgam Filling or Composite Filling? How to Make the Right Choice

The most commonly used filling materials for treating tooth decay are amalgam and composite fillings. Although white fillings have become more common today as aesthetic expectations have risen, amalgam fillings are still preferred in some cases. So what are the differences between amalgam and composite fillings, and which one should be preferred in which situation?

What Is an Amalgam Filling?

Amalgam filling is a metal-based filling material made from a mixture of silver, copper, tin, and mercury. It has been used in dentistry for about 150 years.

Characteristics of Amalgam Fillings

• Silver-gray in color
• Quite durable
• Resistant to chewing force
• Average lifespan of 10-15 years or longer

Advantages of Amalgam Fillings

• Provides high durability in back teeth
• Performs strongly in large cavities
• Can be applied in situations where moisture control is difficult

Disadvantages of Amalgam Fillings

• Not aesthetic
• The metallic color is noticeable
• May require removing more tooth structure
• Can expand and contract with temperature changes

What Is a Composite (White) Filling?

A composite filling is a tooth-colored, resin-based aesthetic filling material. It can be used on both front and back teeth.

Characteristics of Composite Fillings

• Matches the natural tooth color
• Bonds chemically to the tooth
• Requires more minimal tooth reduction
• Can be completed in a single session
• Average lifespan of 7-12 years

Advantages of Composite Fillings

• More aesthetically compatible
• Provides a natural look on front teeth
• Preserves more of the healthy tooth structure
• Contains no metal

Disadvantages of Composite Fillings

• Can wear down over time under heavy chewing forces
• Requires good isolation during application

Differences Between Amalgam and Composite Fillings

Aesthetic Difference

Composite fillings look natural because they match the tooth color. Amalgam fillings, being metallic in color, are aesthetically disadvantageous, especially in visible areas.

Durability Difference

Amalgam fillings can perform well over a long lifespan, particularly on back molars. Although modern composite fillings have become quite durable as well, amalgam can still offer an advantage in very large restorations.

Preserving Tooth Structure

Because composite filling can bond to the tooth, less healthy tooth structure is removed. Since amalgam filling requires mechanical retention, more reduction may be needed.

Thermal Conductivity

Because of its metal structure, amalgam can expand more in response to heat and cold. Composite fillings behave more stably in this respect.

Health and Mercury Content

Amalgam fillings contain mercury. Current scientific data does not show that intact amalgam fillings cause serious systemic toxicity in the general population. However, alternative materials may be preferred in certain specific situations.

Which Filling Is Preferred in Which Case?

Composite Filling Is More Suitable

• For front-tooth decay
• When aesthetic expectations are high
• For small and medium-sized cavities
• In cases where preserving tooth structure matters

Amalgam Filling May Be Preferred

• For large back-tooth restorations
• In people with strong chewing forces
• In situations where moisture control is difficult

Should Old Amalgam Fillings Be Replaced?

Not every amalgam filling needs to be replaced. If the filling is intact, not leaking, has no decay underneath, and is not causing a fracture, it can simply be monitored.

However, replacement may be considered in the following cases:

• If the filling is fractured
• If new decay has formed underneath
• If there is aesthetic discomfort
• If the dentist deems it necessary

Frequently Asked Questions

Are white fillings used on back teeth?

Yes. Composite materials developed today can be used safely on back teeth as well.

Is amalgam filling harmful?

Scientific studies show that intact amalgam fillings do not pose a serious health risk for most people. However, alternative materials may be preferred during pregnancy or in certain specific health conditions.

How long does a filling procedure take?

Most filling treatments are completed in a single session. The duration can vary depending on the size of the decay.

Does a white filling change color over time?

Factors such as tea, coffee, and smoking can cause discoloration in composite fillings over time.

Conclusion

Amalgam and composite fillings each have different advantages. The right filling choice should be determined based on many factors, such as the tooth’s location, the size of the decay, chewing force, aesthetic expectations, and oral hygiene. Although composite fillings are more commonly preferred today due to their aesthetic and protective approach, amalgam fillings can still be an effective option in some situations.

For more information about filling treatment, you can review the Dental Filling page.