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73. 发明专利

CA3073898A1 BLANK AND DENTAL RESTORATION 未知
公开(公告)号：CA3073898A1
公开(公告)日：2017-07-06
申请号：CA3073898
申请日：2016-12-23
申请人： DENTSPLY SIRONA INC , DEGUDENT GMBH
发明人： VOLKL LOTHAR , FECHER STEFAN , KUTZNER MARTIN , HORHOLD HEINER
IPC分类号： A61K6/818 , A61C5/70 , A61C13/00 , A61C13/083 , A61C13/09 , A61K6/807 , A61K6/822 , C04B35/48
摘要： The invention relates to a method for the preparation of a blank from a ceramic material, wherein at least two layers of ceramic material of different compositions are filled into a die layer-by-layer and after filling of the layers they are then pressed and sintered, wherein after filling of a first layer this is structured on its surface in such a way that the first layer, viewed across its surface, differs in its height from region to region, and then a layer with a composition that differs from the first layer is filled as a 14 WHAT IS CLAIMED IS: 1. A pre-sintered or fully-sintered blank for use for the production of a dental restoration consisting of a ceramic material which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) or cerium oxide (CeO2), when viewed across a height thereof has layers of different compositions, wherein material of a first said layer differs from material of a second said layer in terms of color and proportions of stabilized crystal forms present at room temperature, wherein the zirconium dioxide has at least a 95% tetragonal crystal form in the first said layer and between 51% and 80% in the second said layer, and wherein the blank has at least three said layers, of which one is a middle said layer that extends over at least 1/10 H to 1/5 H of a total height H of the blank, and which is formed from a material of the first said layer and the second said layer. 2. A pre-sintered or fully-sintered blank for use for the production of a dental restoration consisting of a ceramic material which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) and cerium oxide (CeO2), when viewed across a height thereof has layers of different compositions, wherein material of a first said layer differs from material of a second said layer in terms of color and proportions of stabilized crystal forms present at room temperature, wherein the zirconium dioxide has at least a 95% tetragonal crystal form in the first said layer and between 51% and 80% in the second said layer, and wherein the blank has at least three said layers, of which one is a middle said layer that extends over at least 1/10 H to 1/5 H of a total height H of the blank, and which is formed from a material of the first said layer and the second said layer. 15 3. The pre-sintered blank or the fully-sintered blank of any one of claims 1 to 2, wherein the dental restoration is a dental framework, a crown, a partial crown, a bridge, a cap, a veneer, an abutment, or a pin construction. 4. The pre-sintered blank or the fully-sintered blank of any one of claims 1 to 2, wherein the dental restoration is a multi-element bridge. 5. A blank according to any one of claims 1 to 4, wherein in the middle said layer the percentage of the material of the first said layer starting therefrom in a direction of the second said layer decreases continuously or substantially continuously. 6. The blank according to any one of claims 1 to 5, wherein the zirconium dioxide is doped with yttrium oxide, wherein the percentage of yttrium oxide in the first said layer is between 4.5wt% and 7.0wt%, wherein the percentage of yttrium oxide in the second said layer is between 7.0wt% and 9.5wt%, and wherein the percentage of yttrium oxide in the first said layer is lower than in the second said layer. 7. The blank according to any one of claims 1 to 6, wherein the percentage of yttrium oxide in the middle said layer from the first said layer commencing in the direction of the second said layer increases continuously or substantially continuously. 16 8. The blank according to any one of claims 1 to 7, wherein the first said layer is different from that of the second said layer. 9. The blank according to at least one of claims 1 to 8, wherein the dental restoration derived from the blank, when viewed in a tooth axis direction on a root side has a higher translucency than on an incisal side or on the incisal side has a higher translucency than on the root side, after complete sintering. 10. The blank according to at least one of claims 1 to 8, wherein the dental restoration derived from the blank, when viewed in a tooth axis direction on a root side has a higher translucency than on an incisal side and on the incisal side has a higher translucency than on the root side, after complete sintering. 11. A dental restoration produced from a blank according to any one of claims 1 to 4, wherein the restoration when viewed in a tooth axis direction consists of at least one first layer extending on a root side, a second layer extending on an incisal side and a middle layer or intermediate layer extending between the first layer and the second layer, which decreases in strength continuously or substantially continuously commencing from the first layer in a direction of the second layer or increases continuously or substantially continuously in translucency, wherein the layers contain or consists of ceramic material, which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) or cerium oxide (CeO2), wherein material of the first layer differs from material of the second layer in terms of color and proportions of stabilized crystal forms present at room temperature, and wherein the 17 zirconium dioxide has at least a 95% tetragonal crystal form in the first layer and between 51% and 80% in the second layer. 12. A dental restoration produced from a blank according to any one of claims 1 to 4, wherein the restoration when viewed in a tooth axis direction consists of at least one first layer extending on a root side, a second layer extending on an incisal side and a middle layer or intermediate layer extending between the first layer and the second layer, which decreases in strength continuously or substantially continuously commencing from the first layer in a direction of the second layer or increases continuously or substantially continuously in translucency, wherein the layers contain or consists of ceramic material, which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) and cerium oxide (CeO2), wherein material of the first layer differs from material of the second layer in terms of color and proportions of stabilized crystal forms present at room temperature, and wherein the zirconium dioxide has at least a 95% tetragonal crystal form in the first layer and between 51% and 80% in the second layer. 13. A dental restoration produced from a blank according to any one of claims 1 to 4, wherein the restoration when viewed in a tooth axis direction consists of at least one first layer extending on a root side, a second layer extending on an incisal side and a middle layer or intermediate layer extending between the first layer and the second layer, which decreases in strength continuously or substantially continuously commencing from the first layer in a direction of the second layer and increases continuously or substantially continuously in its-translucency thereof, wherein the layers contain or consists of ceramic material, which contains zirconium 18 dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) or cerium oxide (CeO2), wherein material of the first layer differs from material of the second layer in terms of color and proportions of stabilized crystal forms present at room temperature, and wherein the zirconium dioxide has at least a 95% tetragonal crystal form in the first layer and between 51% and 80% in the second layer. 14. A dental restoration produced from a blank according to any one of claims 1 to 4, wherein the restoration when viewed in a tooth axis direction consists of at least one first layer extending on a root side, a second layer extending on an incisal side and a middle layer or intermediate layer extending between the first layer and the second layer, which decreases in strength continuously and substantially continuously commencing from the first layer in a direction of the second layer and increases continuously or substantially continuously in its translucency thereof, wherein the layers contain or consists of ceramic material, which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) and cerium oxide (CeO2), wherein material of the first layer differs from material of the second layer in terms of color and proportions of stabilized crystal forms present at room temperature, and wherein the zirconium dioxide has at least a 95% tetragonal crystal form in the first layer and between 51% and 80% in the second layer. 15. The dental restoration of any one of claims 11 to 14, wherein the dental restoration is a crown, a partial crown or a bridge. 19 16. The dental restoration according to any one of claims 11 to 14, wherein the dental restoration is a bridge having a connector with a basal side extending in a region of the first layer. 14 WHAT IS CLAIMED IS: 1. A pre-sintered or fully-sintered blank for use for the production of a dental restoration consisting of a ceramic material which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) or cerium oxide (CeO2), when viewed across a height thereof has layers of different compositions, wherein material of a first said layer differs from material of a second said layer in terms of color and proportions of stabilized crystal forms present at room temperature, wherein the zirconium dioxide has at least a 95% tetragonal crystal form in the first said layer and between 51% and 80% in the second said layer, and wherein the blank has at least three said layers, of which one is a middle said layer that extends over at least 1/10 H to 1/5 H of a total height H of the blank, and which is formed from a material of the first said layer and the second said layer. 2. A pre-sintered or fully-sintered blank for use for the production of a dental restoration consisting of a ceramic material which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) and cerium oxide (CeO2), when viewed across a height thereof has layers of different compositions, wherein material of a first said layer differs from material of a second said layer in terms of color and proportions of stabilized crystal forms present at room temperature, wherein the zirconium dioxide has at least a 95% tetragonal crystal form in the first said layer and between 51% and 80% in the second said layer, and wherein the blank has at least three said layers, of which one is a middle said layer that extends over at least 1/10 H to 1/5 H of a total height H of the blank, and which is formed from a material of the first said layer and the second said layer. 15 3. The pre-sintered blank or the fully-sintered blank of any one of claims 1 to 2, wherein the dental restoration is a dental framework, a crown, a partial crown, a bridge, a cap, a veneer, an abutment, or a pin construction. 4. The pre-sintered blank or the fully-sintered blank of any one of claims 1 to 2, wherein the dental restoration is a multi-element bridge. 5. A blank according to any one of claims 1 to 4, wherein in the middle said layer the percentage of the material of the first said layer starting therefrom in a direction of the second said layer decreases continuously or substantially continuously. 6. The blank according to any one of claims 1 to 5, wherein the zirconium dioxide is doped with yttrium oxide, wherein the percentage of yttrium oxide in the first said layer is between 4.5wt% and 7.0wt%, wherein the percentage of yttrium oxide in the second said layer is between 7.0wt% and 9.5wt%, and wherein the percentage of yttrium oxide in the first said layer is lower than in the second said layer. 7. The blank according to any one of claims 1 to 6, wherein the percentage of yttrium oxide in the middle said layer from the first said layer commencing in the direction of the second said layer increases continuously or substantially continuously. 16 8. The blank according to any one of claims 1 to 7, wherein the first said layer is different from that of the second said layer. 9. The blank according to at least one of claims 1 to 8, wherein the dental restoration derived from the blank, when viewed in a tooth axis direction on a root side has a higher translucency than on an incisal side or on the incisal side has a higher translucency than on the root side, after complete sintering. 10. The blank according to at least one of claims 1 to 8, wherein the dental restoration derived from the blank, when viewed in a tooth axis direction on a root side has a higher translucency than on an incisal side and on the incisal side has a higher translucency than on the root side, after complete sintering. 11. A dental restoration produced from a blank according to any one of claims 1 to 4, wherein the restoration when viewed in a tooth axis direction consists of at least one first layer extending on a root side, a second layer extending on an incisal side and a middle layer or intermediate layer extending between the first layer and the second layer, which decreases in strength continuously or substantially continuously commencing from the first layer in a direction of the second layer or increases continuously or substantially continuously in translucency, wherein the layers contain or consists of ceramic material, which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) or cerium oxide (CeO2), wherein material of the first layer differs from material of the second layer in terms of color and proportions of stabilized 17 crystal forms present at room temperature, and wherein the zirconium dioxide has at least a 95% tetragonal crystal form in the first layer and between 51% and 80% in the second layer. 12. A dental restoration produced from a blank according to any one of claims 1 to 4, wherein the restoration when viewed in a tooth axis direction consists of at least one first layer extending on a root side, a second layer extending on an incisal side and a middle layer or intermediate layer extending between the first layer and the second layer, which decreases in strength continuously or substantially continuously commencing from the first layer in a direction of the second layer or increases continuously or substantially continuously in translucency, wherein the layers contain or consists of ceramic material, which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) and cerium oxide (CeO2), wherein material of the first layer differs from material of the second layer in terms of color and proportions of stabilized crystal forms present at room temperature, and wherein the zirconium dioxide has at least a 95% tetragonal crystal form in the first layer and between 51% and 80% in the second layer. 13. A dental restoration produced from a blank according to any one of claims 1 to 4, wherein the restoration when viewed in a tooth axis direction consists of at least one first layer extending on a root side, a second layer extending on an incisal side and a middle layer or intermediate layer extending between the first layer and the second layer, which decreases in strength continuously or substantially continuously commencing from the first layer in a direction of the second layer and increases continuously or substantially continuously in translucency thereof, wherein the layers contain or consists of ceramic material, which contains zirconium dioxide doped with yttrium oxide (Y2O3), calcium oxide (CaO), magnesium oxide (MgO) or cerium oxide (CeO2),

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