Common Materials for Dental Crowns and Bridges

PFM crowns combine a durable metal base with a tooth-colored layer of porcelain, offering both strength and aesthetics. This traditional choice has long been used for anterior and posterior restorations due to its proven performance. The metal base provides excellent strength for load-bearing areas such as posterior teeth (molars and premolars), while the outer porcelain layer provides a natural appearance that blends with adjacent teeth.

PFM also has a long track record of clinical use, making it a reliable option for many case types. However, one drawback is that over time, if the gums recede, the underlying metal may become visible, creating a gray line at the margin. Additionally, PFM is generally less translucent than all-ceramic materials, which can affect its aesthetic appearance in highly visible areas.

All-ceramic crowns are made entirely of porcelain or ceramic materials, containing no metal. They are highly favored for their lifelike appearance and are often the first choice for restoring anterior teeth. These crowns offer superior aesthetics due to their ability to mimic the translucency of natural enamel. They are also an excellent choice for patients with metal allergies, as they are biocompatible and metal-free.

All-ceramic crowns are available in various ceramic formulations and can be customized to achieve highly accurate color matching. Nevertheless, they may not be the best option for molars or patients with bruxism, as they are generally less resistant to high bite forces compared to other materials.

Zirconia crowns are made from a high-strength ceramic known for its exceptional durability and fracture resistance. This material is increasingly popular because it performs well in both posterior and aesthetic applications. Monolithic zirconia offers extremely high strength, making it ideal for patients with heavy bite forces or bruxism. It is also biocompatible and metal-free, providing a safe long-term option for sensitive patients. Zirconia crowns are available in both monolithic and layered forms, offering flexibility between durability and aesthetics.

However, monolithic zirconia may be less translucent than natural teeth, while layered zirconia requires precise shade matching and polishing to achieve a natural look. Choosing the right type of zirconia and working with a skilled lab are essential for optimal results.

E.max crowns are made from lithium disilicate glass-ceramic, known for combining aesthetics with moderate strength. These crowns are particularly well suited for anterior teeth and premolars where aesthetics are paramount. E.max offers excellent translucency and color matching, making it a popular choice for cosmetic restorations. It is also compatible with CAD/CAM workflows, allowing for efficient digital design and milling.

Compared to traditional porcelain crowns, E.max provides greater strength, but it may still not be adequate for molars subjected to high occlusal forces or patients with severe bruxism. As with all restorative options, case selection is critical to long-term success.

Full metal crowns are made from gold alloys, palladium alloys, or base metal alloys such as nickel or chromium. These crowns offer unmatched strength and longevity, making them ideal for molars or other posterior teeth that endure significant chewing forces. Metal crowns are smooth, cause minimal wear to opposing natural enamel, and provide a highly stable fit—especially useful in situations with limited space.

Despite their functional advantages, metal crowns are not tooth-colored, which limits their use in visible areas. Additionally, precious metals like gold can significantly increase the material cost, which is an important consideration for some patients.