Either you heard wrong, or your dentist is misinformed.  Titanium is
strong and light, but notoriously hard to cast.
    Most porcelain/metal crowns are built on copings of various gold
alloys, or variants on stainless steel.

Steve

I asked my dentist about porcelain crowns for front teeth and he said he
uses porcelain on titanium. Is this a good method and does it look as
natural as plain porcelain, he said it does.

Also, I have to have crown recemented and he's going to put a titanium post
and built up core. Is price of $450 right? Probably need a new crown if
original doesn't fit right as well.