Which material is identified as a common implant material?

• A. Titanium
• B. Gold
• C. Zirconia
• D. Titanium and titanium alloys

Answer: (D)

The key idea is that dental implants need something that is biocompatible, strong, resistant to the harsh oral environment, and capable of bonding with bone over time. Titanium and its alloys fit the bill best. They naturally form a thin, stable oxide layer (titanium oxide) that protects against corrosion from saliva and oral bacteria, while still allowing the surface to interact with bone to enable osseointegration. This combination of corrosion resistance, good mechanical strength with a favorable stiffness that helps prevent stress shielding, and a long track record of successful, durable implants makes titanium and titanium alloys the most widely used implant materials in dentistry.

Gold is biocompatible and corrosion-resistant, but it’s expensive and does not promote osseointegration as reliably, plus it’s mechanically softer for load-bearing implants. Zirconia offers excellent aesthetics and metal-free options, but it has not achieved the same level of long-term clinical data and versatility as titanium, and it can be more brittle in certain applications. Therefore, titanium and its alloys remain the standard choice for common implants.