Thank you Russ for answering me!
I don't understand how they could call it metal-free if it has aluminum in it? Isn't aluminum a metal?

This is what the cerec company says;
[Using metal free materials that are the closest to your natural enamel, CEREC gives you the highest quality restorative care.]

Here is their link....does this help?
http://www.cereconline.com/ecomaXL/index.php?site=CEREC_Dentist_Materials-1

Since I'll have to travel to get to this dentist, I like the idea of a one time appointment. I think I read that it takes like 5 minutes to make the crown and hopefully, I won't need a metal support for the crowns.....that would be sooo cool, not to have any metal in my mouth.

I can't find a dentist (close to me) that uses diamond lite....but I can find a lot of dentists in Texas that use cerec.

I totally don't understand the different materials and what they do to people's bodies....I really need help from someone who knows a lot more then I do.

Thank you for all of your help.