Zirconia pre-sintered body suitable for dental use

2:

• The zirconia pre-sintered body according to claim 1, wherein the layers having substantially the same stabilizer content are adjacent to one another.

3:

• The zirconia pre-sintered body according to claim 1, wherein the coloring component comprises an oxide of at least one element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Pr, Tb, and Er;
• or (Zr,V)O2.

4:

• The zirconia pre-sintered body according to claim 1, wherein the layered structure includes only one layer having the highest stabilizer content.

5:

• The zirconia pre-sintered body according to claim 1, wherein the layer having the highest stabilizer content does not contain a coloring component.

6:

• The zirconia pre-sintered body according to claim 1, wherein the layer having the highest stabilizer content contains a coloring component.

7:

• The zirconia pre-sintered body according to claim 6, wherein the coloring component contained in the layer having the highest stabilizer content differs in composition from the coloring components of the other layers.

8:

• The zirconia pre-sintered body according to claim 1, wherein, in the layers that differ from one another in the content of the stabilizer, the stabilizer content relative to the total mole of the zirconia and the stabilizer shows an unchanging pattern of increase or decrease from one end to the other end of the zirconia pre-sintered body on a straight line extending along a first direction from one end to the other end of the zirconia pre-sintered body.

9:

• The zirconia pre-sintered body according to claim 1, wherein the stabilizer is yttria.

10:

• The zirconia pre-sintered body according to claim 9, wherein, in the layers that differ from one another in the content of yttria, the stabilizer content relative to the total mole of the zirconia and the stabilizer shows an unchanging pattern of increase or decrease from one end to the other end of the zirconia pre-sintered body on a straight line extending along a first direction from one end to the other end of the zirconia pre-sintered body, and wherein the yttria content relative to the total mole of the zirconia and the yttria is 3.5 mol % or more and 6.5 mol % or less in the layer including said one end, and is 2.5 mol % or more and less than 4.5 mol % in the layer including said other end.

11:

• The zirconia pre-sintered body according to claim 10, wherein, in the layers that differ from one another in the content of yttria, the stabilizer content relative to the total mole of the zirconia and the stabilizer shows an unchanging pattern of increase or decrease from one end to the other end of the zirconia pre-sintered body on a straight line extending along a first direction from one end to the other end of the zirconia pre-sintered body, and wherein the difference in yttria content between the layer including said one end and the layer including said other end is 3.0 mol % or less relative to the total mole of the zirconia and the yttria.

13:

• The zirconia pre-sintered body according to claim 1, which shows a changing pattern of increase or decrease in post-sintering L* value according to L*a*b* color system from a first point toward a second point on a straight line connecting the first point and the second point when the first point falling within an interval from one end of the zirconia pre-sintered body to 25% of the entire length on a straight line extending along a first direction from said one end to the other end of the zirconia pre-sintered body has post-sintering (L*, a*, b*) of (L1, a1, b1) according to L*a*b* color system, and the second point falling within an interval from said other end to 25% of the entire length on a straight line extending along the first direction has post-sintering (L*, a*, b*) of (L2, a2, b2) according to L*a*b* color system.

14:

• The zirconia pre-sintered body according to claim 13, wherein L1<L3>L2 when a third point falling between the first point and the second point on a straight line connecting the first point and the second point has post-sintering (L*, a*, b*) of (L3, a3, b3) according to L*a*b* color system.

15:

• A method for producing a zirconia sintered body, comprising sintering a zirconia pre-sintered body of claim 1 at a highest sintering temperature of 1,400° C. to 1,650° C.

16:

• A method for producing a dental product, comprising sintering a zirconia pre-sintered body of claim 1 after milling.

17:

• The method according to claim 16, wherein the milling uses a CAD/CAM system.