<prompt> Titanium is highly inert when used for dental applications such as implants, crowns. This can be attributed toTitanium is a noble metalTitanium is covered by Titanium oxide layerTitanium is covered by Chromium oxide layerNone of the above  <response>: 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. 