Types of Dental Crowns and Their Indications

What Is a Dental Crown?

A dental crown is a cap-shaped restoration that fully encases a damaged or weakened tooth above the gum line. It is one of the most common restorations used in both restorative and cosmetic dentistry, restoring the tooth's natural form while protecting what remains underneath.

The main purposes of a dental crown are to:

• Protect a weak or cracked tooth from further damage
• Restore the shape, size and function of a broken-down tooth
• Improve the appearance of discoloured or misshapen teeth
• Strengthen and seal a tooth after root canal treatment
• Support a dental bridge or cover a dental implant

Types of Dental Crowns

There are several types of dental crowns, each made from different materials with their own strengths, ideal uses and trade-offs. Here are the most common ones.

1. Metal Crowns

Metal crowns are made from alloys such as gold, palladium, nickel or chromium. They are extremely durable and highly resistant to wear, which makes them a reliable choice for back teeth.

Advantages

• Extremely strong and long-lasting
• Require minimal removal of natural tooth structure
• Ideal for patients who grind their teeth
• Rarely chip or break; easy to maintain
• Biocompatible (noble metals)

Indications

• Posterior teeth (molars) where strength matters more than appearance
• Patients with heavy biting forces
• Teeth that need long-term durability with minimal maintenance

Limitations

• Metallic colour is not ideal for visible front teeth
• Metal conducts heat and cold, which may cause temporary sensitivity
• The hard surface can wear down opposing natural teeth
• May interfere with some MRI scans or security scanners

2. Porcelain-Fused-to-Metal (PFM) Crowns

PFM crowns have a strong metal core covered with a tooth-coloured porcelain layer, combining the durability of metal with a more natural appearance.

Advantages

• Combines the strength of metal with the aesthetics of porcelain
• Can be shade-matched to surrounding teeth
• Suitable for both front and back teeth
• Shields weak or root-canal-treated teeth from further damage

Indications

• Both anterior and posterior teeth
• Teeth requiring strength with moderate aesthetics
• Bridge abutments
• Root canal treated teeth

Disadvantages

• Porcelain can chip over time
• A dark metal margin may show near the gum line as gums recede
• Less translucent than all-ceramic crowns

3. All-Ceramic / All-Porcelain Crowns

All-ceramic crowns are metal-free and offer superior aesthetics, closely matching the translucency and colour of natural teeth. They are an excellent option for patients with metal allergies.

Advantages

• Excellent, natural-looking aesthetics
• No dark metal margins
• Biocompatible and completely metal-free

Indications

• Anterior (front) teeth
• Patients with high aesthetic demands
• Metal-sensitive individuals

Disadvantages

• Can be less fracture-resistant than metal in some cases
• Require precise preparation and bonding

4. Zirconia Crowns

Zirconia crowns are among the strongest ceramic crowns available. They combine high fracture resistance with improved aesthetics, especially in newer translucent zirconia formulations.

Advantages

• Extremely strong and durable
• Completely metal-free
• Gentle on opposing teeth
• Resist food staining
• Require less removal of natural tooth structure

Indications

• Posterior teeth requiring high strength
• Patients with bruxism (teeth grinding)
• Implant-supported crowns
• Cases needing durability with reasonable aesthetics

Disadvantages

• Slightly less translucent than porcelain
• Shade matching can be challenging for front teeth

5. Resin Crowns (Temporary Crowns)

Resin crowns are more affordable and are typically used as temporary or short-term restorations. They are quick and easy to fabricate but are less durable than other crown types.

Advantages

• Cost-effective
• Quick to fabricate

Indications

• Temporary crowns
• Paediatric (children's) dentistry
• Short-term restorative needs

Disadvantages

• Prone to wear and fracture
• Short lifespan
• Limited long-term aesthetic stability

Common Reasons for a Dental Crown

A dentist may recommend a crown in several situations, including:

• Extensive tooth decay that a filling cannot restore
• Fractured or cracked teeth
• Protecting a tooth after root canal treatment
• Worn-down teeth from grinding (attrition) or erosion
• Cosmetic correction of tooth shape or colour
• Supporting a dental bridge
• Covering a dental implant

Choosing the Right Crown

There is no single "best" crown - the right choice depends on several factors your dentist will assess during your consultation for crowns & bridges:

• Location of the tooth (front vs back)
• Aesthetic requirements
• Amount of natural tooth structure remaining
• Biting and chewing (occlusal) forces
• Oral habits such as teeth grinding
• Budget and cost considerations

Frequently Asked Questions