Zirkoniumoksidipohjainen sintteri, menetelmä sen valmistamiseksi, jauhinosamateriaali ja siltamateriaali hampaiden oikaisua varten

摘要

A zirconia-based sinter stabilized with a rare earth metal oxide is provided which has high fracture toughness properties, is excellent in mechanical strength and thermal stability, and contains a boron compound. A process for producing the sinter and a grinding part material and a bracket material for dental correction both constituted of said zirconia-based sinter are also provided. Specifically, a zirconia-based sinter comprising ZrO2 as the main component, one or more rare earth metal oxides (R2O3) selected from Yb2O3, Er2O3, Ho2O3, Y2O3, and Dy2O3, and a boron compound Äor a boron compound and Al2O3 and/or SiO2Ü, wherein R2O3/ZrO2 (molar proportion) is from 1.3/98.7 to 2/98, excluding 2/98, and the content of boron components is from 0.05 to 8% by mole in terms of B2O3 Äor in addition thereto the content of Al2O3 is from 0.1 to 5% by mole and/or the content of SiO2 is from 0.05 to 1.5% by moleÜ. A grinding part material and a bracket material for dental correction both constituted of the zirconia-based sinter.