I had a premolar crowm made by Hitech ceramics recently. The crown is suppose to be high noble metal yellow gold.It turns out that it looks like amalgam. the technician sent my Dentist a certificate showing alloy contents 73.8 % Gold and 90 % silver that is not high noble metal yellow gold that is over a 100% not including all the other metal listed on the certificate. this is a base metal that I was charged something is wrong with this picture buyer beware. Overall the Dentist was fair I just think she doesn't believe me I have to now prove my case.