The Different Types of Fillings

different types of fillings: gold, amalgam, composite resin

Dental fillings are a common procedure used to repair teeth that have been damaged by decay or trauma. They help restore the tooth’s shape, function, and appearance. Over the years, dental technology has advanced, leading to a variety of filling materials that cater to different needs. In this blog, we’ll explore the different types of dental fillings available, their advantages, and considerations for each.

Direct vs. Indirect Fillings: Understanding the Differences

One of the first things one needs to know about dental fillings is that there are two main categories. When it comes to dental fillings, the terms “direct” and “indirect” refer to the way the fillings are placed within the tooth. Both methods are designed to restore and protect teeth that have been damaged, but they differ in their application, materials, and situations in which they are used. Let’s explore these differences in detail.

Direct Fillings

Direct fillings are applied directly to a cavity in a single visit. This process involves the dentist cleaning out the decayed part of the tooth, then filling it with a specific dental material.

Advantages of Direct Fillings:

  • Time-Efficiency: The entire procedure is completed in one visit.
  • Cost-Effectiveness: Generally less expensive than indirect fillings.
  • Simplicity: Suitable for small to moderate cavities.


  • Strength: While effective, they might not be as strong as indirect fillings, especially for large restorations.
  • Longevity: Some direct filling materials may not last as long as indirect options.

Types of Direct Fillings

1. Amalgam Fillings

Amalgam fillings, also known as silver fillings, are a traditional type of dental filling. They are made from a mixture of metals including silver, mercury, tin, and copper.

Advantages of Amalgam FillingsConsiderations for Amalgam Fillings
Durability: Highly durable, making them suitable for back teeth where chewing pressure is greatest.Aesthetics: Silver color is noticeable, not ideal for visible teeth.
Cost-Effectiveness: Generally less expensive than other types of fillings.Mercury Content: Contains mercury, which raises concerns for some people, though deemed safe by the ADA.
Longevity: Can last up to 15 years or more with proper care.Compatibility: May not be suitable for people with allergies to metals used in amalgam.
Proven Track Record: Used for over a century with a well-established history of effectiveness.Temperature Sensitivity: Can conduct heat and cold, which might cause discomfort.
Strength: Strong enough to withstand heavy biting forces.Potential for Tooth Discoloration: Can cause a greyish hue to the surrounding tooth structure.

2. Composite Fillings

Composite fillings are made of a plastic and glass mixture that can be closely matched to the color of your teeth.

Advantages of Composite FillingsConsiderations for Composite Fillings
Aesthetics: Can be closely matched to the color of your teeth, making them ideal for visible areas.Durability: Less durable than amalgam, particularly for larger fillings or those in high-pressure areas.
Bonding: They bond directly to the tooth structure, providing additional support and minimizing tooth removal.Cost: Generally more expensive than amalgam fillings.
Versatility: Suitable for a wide range of dental repairs, including chipped, broken, or worn teeth.Lifespan: May have a shorter lifespan compared to amalgam or gold fillings, often needing replacement in about 5 to 10 years.
Less Invasive: Often require less removal of tooth structure compared to amalgam fillings.Staining: Can stain or discolor over time, especially with coffee, tea, or tobacco use.
Immediate Results: Quickly hardened by exposure to a specific type of light, allowing for faster treatment completion.Shrinkage: Composite material may shrink slightly when placed, potentially leading to gaps and leakage.
Biocompatibility: Generally well tolerated by patients with allergies to metals used in amalgam fillings.Technique-Sensitive: The success of these fillings can depend on the dentist’s technique and the environment in which they are placed.

3. Glass Ionomer Fillings

These fillings are made from a blend of acrylic and a specific type of glass material.

Advantages of Glass Ionomer FillingsConsiderations for Glass Ionomer Fillings
Fluoride Release: They release fluoride which can help protect the tooth from further decay.Strength and Durability: Less durable than composite or amalgam, making them more prone to wear and tear.
Adhesion: Bond well with the tooth, providing a good seal and reducing the risk of leakage.Aesthetics: Not as aesthetically pleasing as composite or ceramic fillings, may not match tooth color as closely.
Biocompatibility: Good for patients with allergies to other filling materials, and generally well-tolerated.Limited Use: Often used for non-load bearing areas, such as small fillings in children’s teeth or temporary fillings.
Less Tooth Preparation: Often requires less removal of the tooth structure compared to other types of fillings.Moisture Sensitive: Application can be more sensitive to moisture, requiring careful isolation of the tooth.
Good for Certain Patients: Particularly beneficial for children or individuals with a high risk of decay.Wear: More susceptible to abrasion and erosion than other filling materials.
Shorter Lifespan: Typically, they have a shorter lifespan than other types of fillings, necessitating more frequent replacements.

Indirect Fillings

Indirect fillings involve a two-step process. Initially, the dentist prepares the tooth and takes an impression, which is sent to a dental lab. The lab creates a custom filling (inlay or onlay) which is then cemented into place in a subsequent visit. Inlays are designed to fit within the cusps (the raised points) of a tooth, making them ideal for treating decay or damage confined to the tooth’s biting surface. Onlays, on the other hand, are more extensive. They cover one or more cusps or the entire biting surface of a tooth, thus are used in situations where the damage is more significant and extends beyond the confines of a single cusp.

Advantages of Indirect Fillings:

  • Durability: Generally stronger and more durable, especially for larger restorations.
  • Precision: Custom-made to fit precisely, which can improve tooth structure and health.
  • Aesthetic Quality: Materials like porcelain can provide a more natural appearance.


  • Cost: Typically more expensive than direct fillings.
  • Time: Requires at least two visits and a longer waiting period.

Types of Indirect Fillings:

Ceramic Fillings

Ceramic fillings are usually made of porcelain and are both durable and aesthetically pleasing. They are often used to fabricate inlays and onlays, especially by cosmetic dentists. 

Advantages of Ceramic FillingsConsiderations for Ceramic Fillings
Aesthetics: They closely match the natural color of the teeth, making them highly aesthetic and ideal for visible teeth.Cost: Ceramic fillings are typically more expensive than composite and amalgam fillings.
Durability: Ceramic fillings are very durable and wear-resistant, often lasting longer than composite fillings.Brittleness: While strong, they can be brittle and may not be recommended for areas under high chewing pressure.
Stain Resistance: Highly resistant to staining, maintaining their color over a longer period than composite fillings.Procedure Complexity: The process of placing ceramic fillings may be more complex and time-consuming.
Biocompatibility: They are well-tolerated by the surrounding gum tissue, reducing the risk of allergic reactions or sensitivities.Repair Difficulty: If damaged, ceramic fillings can be more challenging to repair than other types.
Thermal Conductivity: Less heat and cold sensitive compared to metal fillings, providing more comfort in temperature changes.Thickness Requirement: May require more extensive tooth preparation to accommodate the thickness of the ceramic.

Gold Fillings

Gold fillings are made of a gold alloy and offer a unique choice for fillings. They are use to fabricate inlays and onlays, however they are more noticeable than ceramic fillings. 

Advantages of Gold FillingsConsiderations for Gold Fillings
Durability: Gold fillings are highly durable and can withstand chewing forces, making them suitable for long-term use.Cost: Among the most expensive options for fillings, which can be a significant consideration for some patients.
Biocompatibility: Gold is well-tolerated by gum tissues and is less likely to cause allergic reactions.Aesthetics: Gold fillings are very noticeable, and their metallic appearance might not be desirable for visible teeth.
Longevity: Gold fillings can last for decades, often outlasting other filling materials.Multiple Visits: The process of getting a gold filling typically requires more than one dental visit.
Corrosion Resistance: They do not corrode over time, maintaining their integrity and structure.Conductivity: Gold is a good conductor of heat and cold, which might lead to sensitivity in some patients.
Marginal Integrity: They provide excellent marginal integrity, fitting well to the edges of the cavity preparation.Time for Fabrication: As they are crafted in a laboratory, there is a waiting period before the filling can be placed.

Choosing Between Direct and Indirect Fillings

The choice between direct and indirect fillings depends on several factors:

  • Extent of Decay or Damage: Indirect fillings are often chosen for more extensive decay or when a significant portion of the tooth needs to be restored.
  • Aesthetic Concerns: For teeth that are more visible, the superior aesthetic quality of indirect fillings might be preferable.
  • Budget and Time Constraints: Direct fillings are more budget-friendly and time-efficient.
  • Dentist’s Recommendation: The dentist’s expertise and assessment of the tooth’s condition play a crucial role in determining the most appropriate type of filling.

Overall, both direct and indirect fillings have their unique advantages and considerations. It’s important to have a thorough discussion with your dentist about the best option for your dental health, considering the longevity, appearance, cost, and the health of the tooth involved. Regular dental check-ups and proper oral hygiene are essential in maintaining the integrity of any type of filling and overall dental health.


When choosing a filling material, consider factors such as the location of the cavity, aesthetic preferences, budget, and durability needs. It’s essential to discuss with your dentist to understand the best option for your specific situation. Regular dental check-ups and good oral hygiene can help prolong the life of your fillings and maintain overall dental health.

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