Titanium is highly inert when used for dental applications such as implants, crowns. This can be attributed to
Some metals develop a thin adherent layer upon reaction with environment that makes them resistant to corrosion. Chromium oxide develops over Chromium, Titanium oxide develops over Titanium. Excellent biocompatibility of Titanium is attributed to its passive nature, which in turn is due to adherent Titanium Oxide layer.
Titanium is a noble metal
Titanium is covered by Titanium oxide layer
Titanium is covered by Chromium oxide layer
None of the above