Zirconia

Zirconia (zirconium dioxide, ZrO2) is a high-strength ceramic material that has become the dominant choice for implant crowns and is increasingly used for abutments and implants. It combines excellent aesthetics with outstanding mechanical properties.

Types of zirconia

• 3Y-TZP (3 mol% yttria-stabilised tetragonal zirconia polycrystal): The original high-strength zirconia. Extremely strong but relatively opaque — better for posterior teeth where strength matters more than translucency.
• 4Y-TZP and 5Y-TZP: Higher yttria content produces greater translucency at some cost to strength — better for anterior teeth where aesthetics are paramount.
• Multilayer zirconia: Blocks with gradient properties — stronger at the base, more translucent at the occlusal surface — designed to mimic the appearance of natural teeth more closely.

Zirconia crowns

Monolithic zirconia crowns (milled from a solid block) are extremely strong and resistant to chipping — particularly valuable for posterior teeth and in bruxist patients. Layered zirconia (with added porcelain) offers superior aesthetics but carries a small risk of ceramic chipping.

Zirconia abutments

Used particularly for front teeth where thin gum tissue might otherwise reveal a metallic shadow from a titanium abutment. The tooth-coloured abutment produces a more natural appearance through the gum.

Zirconia implants

One-piece ceramic implants are available for patients wanting a completely metal-free solution. Long-term evidence is still accumulating compared to titanium but results to date are promising.