Porcelain Fused to Metal (PFM)

As the name suggests, porcelain fused to metal (PFM) crowns combines porcelain and metal. The porcelain overlay is color-matched to the patient’s natural teeth. Sometimes, the dark metal margin could show at the gingival margin, especially with gingival recession or high smile lines. Dentists may recommend PFM restorations for patients who desire strength and a natural appearance.  

Benefits of PFM restorations

• The material is durable. 
• Matching a patient’s tooth coloring to PFM restorations may be relatively easy.

Limitations of PFM restorations  

• PFM restorations contain various types of metals, which can cause allergic reactions in some patients.  
• The metal around the margins of PFM crowns can become visible at the gingival margin, which is considered unappealing for some patients. 

Zirconia Dental Implants

Zirconia dental implants are ceramic dental implants; they are not metal. They may break more easily than titanium implants. Zirconia, a metal in the periodic table of elements, is found worldwide. Everyday household items such as dinnerware, pipes, and electrical fixtures are made from zirconia.

Because of its natural strength and durability, zirconia is ideal for dental crowns. Zirconia crowns are best for patients who need posterior crowns, which require much strength for masticating food and parafunctional habits. 

Benefits of Zirconia  

• Is compatible with human tissues
• Implants have a low bacterial attraction
• Have high strength and decent fracture resistance
• They hold up well regarding wear and corrosion
• Have excellent esthetics (no metal margins)

Limitations of Zirconia

• Over time, the material may deteriorate and lead to microfractures. Implants are typically only available in one-piece implants; titanium implants are a better option if angle correction is needed. 
• Grinding zirconia can decrease its fracture resistance.
• Although evidence is limited, zirconia implants may have higher failure rates when compared to titanium implants.
• Less clinical research has been conducted on zirconia implants than titanium and PFM restorations. 
• Implant-supported zirconia crowns can be more costly.