Zirconia pre-sintered body suitable for dental use

A zirconia pre-sintered body comprising:

• zirconia;
• and
• a stabilizer capable of inhibiting a phase transformation of zirconia,
• wherein the zirconia predominantly comprises a monoclinic crystal system,
• wherein the zirconia pre-sintered body comprises a plurality of layers that differ from each other in a content of the stabilizer relative to a total mol % of the zirconia and the stabilizer,
• wherein the stabilizer is yttria,
• wherein the zirconia pre-sintered body has a fraction fy of more than 0% as calculated from mathematical expression (1):
• ⁢
• ⁢
• f
• y
• ⁡
• (
• %
• )
• =
• I
• y
• ⁡
• (
• 1
• ⁢
• 1
• ⁢
• 1
• )
• I
• y
• ⁡
• (
• 1
• ⁢
• 1
• ⁢
• 1
• )
• +
• I
• m
• ⁡
• (
• 1
• ⁢
• 1
• ⁢
• 1
• )
• +
• I
• m
• ⁡
• (
• 1
• ⁢
• 1
• -
• 1
• )
• +
• I
• t
• ⁡
• (
• 1
• ⁢
• 1
• ⁢
• 1
• )
• +
• I
• c
• ⁡
• (
• 1
• ⁢
• 1
• ⁢
• 1
• )
• ×
• 100
• (
• 1
• )
• where Iy (111) represents a peak intensity of a (111) plane of the yttria about 2θ=29° in an X-ray diffraction pattern using CuKα radiation,
• Im (111) and Im (11-1) represent peak intensities of (111) plane and (11-1) plane, respectively, of the monoclinic crystal system of the zirconia in the X-ray diffraction pattern,
• It (111) represents a peak intensity of a (111) plane of a tetragonal crystal system of the zirconia in the X-ray diffraction pattern, and
• Ic (111) represents a peak intensity of a (111) plane of a cubic crystal system of the zirconia in the X-ray diffraction pattern, and
• wherein the fraction fy is 13% or less, and
• wherein, on a straight line extending along a first direction from one end to another end of the zirconia pre-sintered body, a content of the yttria relative to a total mol % of the zirconia and the yttria shows unchanging patterns of increase and decrease from the one end toward the other end, and a layer containing the one end has a fraction fy of 1% or more and a layer containing the other end has a fraction fy of 0.5% or more.