Why is titanium used in implants?

Answer: Titanium bonds with bone without immune rejection, so implants stay fixed.

Titanium stays chemically inert, so immune cells have no surface to attack. — Wrong. Titanium is corrosion-resistant, but it is not simply ignored by the body. Its surface interacts with surrounding tissue, and bone cells can grow onto it in a process called osseointegration. The body tolerates it because it does not trigger immune rejection or allergic reactions, not because immune cells have no surface to contact.

Titanium bonds with bone without immune rejection, so implants stay fixed. ✓ — Correct! Titanium is biocompatible, so the body does not reject it as foreign material. Bone can grow directly onto its surface and bond with it, and this osseointegration helps keep implants fixed. Titanium also resists corrosion in body fluids and is strong yet lightweight, which suits joint replacements, dental implants, and bone plates.

Titanium costs less than other implant alloys, so it keeps implant prices low. — Wrong. Titanium is not the cheapest implant metal; it usually costs more than stainless steel. It is widely used because bone can bond to it, the body tolerates it without immune rejection, and it resists corrosion in body fluids. Low price is not its deciding advantage.