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OK, I’m no dental expert, but I googled for “metal-free crowns” and it appears that they use some kind of tooth-colored zirconium oxide for the inner part.

Feel free to correct me if you know more about dentistry than I do (which wouldn’t be very hard!)

There are many kinds of crowns from all metal to all porcelain / metal free.
All metal can be made from almost any castable metal. All porcelain can be made from that exactly... ALL PORCALINE. Also, for stronger crowns AND bridges, porcelain can be fused to alumina or zirconium oxide sub structures. Also referred to as ALL PORCALINE OR METAL FREE. Frameworks of metal or oxides are usually about .3mm - .5 mm thick, with porcelain over about 1mm thick. More people need to know this.We won’t let our kids play with toys made in China, but we have no idea what the crown in our mouth is made of or where it’s from. China isn’t the only off shore country that crowns are coming out of. Any thing made in U S A has to be made with FDA approved products. Dental products have to be approved by the FDA to be sold here. Crowns from other countries are made with products that they just USE! Nothing resold here from off shore has to comply with the FDA. As of now that I know of, a dentist can not send his impressions right to China.... He has to go through a U.S. lab to get to China. If the time comes that a dentist can send right to china, he will get crowns for $35.00 or cheaper. So the way I see it is How can a dentist save/ make more money? How can he cut costs? If right now he pays $75.00 ( more or less) for a China crown and sells it to a patient for $800.00 to $1000.00, he is making money. An American made crown is about $100.00 to $150.00 for porcelain to metal (more or less) and metal free can be $150 - $250.00 (more or less) If you get a knee replacement , those parts are approved by the FDA. Wouldn't’t you want to know your crowns are also?