US Patent Issued to SHOFU on Dec. 2 for "Zirconia mill blank having layers with different contents of yttria and alumina" (Japanese Inventors)

ALEXANDRIA, Va., Dec. 2 -- United States Patent no. 12,484,995, issued on Dec. 2, was assigned to SHOFU INC. (Kyoto, Japan).

"Zirconia mill blank having layers with different contents of yttria and alumina" was invented by Kazumichi Nonaka (Kyoto, Japan), Shuhei Takahashi (Kyoto, Japan) and Mitsuji Teramae (Kyoto, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A zirconia mill blank for dental cutting and machining which may impart reproducibility of color tone similar to a natural tooth and high strength to a zirconia perfect sintered body without a special sintering method such as HIP treatment.The zirconia mill blank for dental cutting and machining comprises at least two intermediate layers LA and L...