I think Tosoh is the world leader in zirconia powder manufacturing for the dental market. There are many companies that are pressing the Tosoh powders and selling blocks. I know Tosoh will blend and customize powders based on desired specs. As far as the best block provider in the world, it a crap shoot. This is like asking what is the best porcelain in the world. The only thing i would add, make sure any parts or blocks you buy are fabricated for isostatically pressed blocks. Non isostatically pressed blocks can and will have flaws in the block that will inevitably be included in your final restoration. This is very important, there are many US (and foreign) facilities manufacturing parts with non isostatically pressed materials. Buyer be ware!
Just a quick question.
How many of you have no clue if you are buying products form isostatically pressed blocks.
Please Please Please, if you don't know find out.
FYI, all CAP zirconia is isostatically pressed.