In 1999, Dr. Groba did two "porcelain" crowns for me. He told me that he was using a material superior to porcelain. Within 6 months, one of the crowns chipped. His assistant said he would replace the crown with porcelain because he had discovered that this new material wasn't holding up. He refused to replace it. By 2006, all of the "superior material" had broken off my crowns and all I had left is the metal base. So much for the "superior material". And yes, he was extremely expensive.
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