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ZIRCONIA MILL BLANK HAVING LAYERS WITH DIFFERENT CONTENTS OF YTTRIA AND ALUMINA
To provide 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.[Solution]A zirconia mill blank for dental cutting and machining comprises at least two intermediate layers LA and LB which satisfy the following Formula (1) and Formula (2), wherein the layer LA is contained in a section A in which a distance from one plane of two planes is within 40 % of the distance between the two planes and the layer LB is contained in a section B in which a distance from the other plane is within 40 % of the distance between the two planes, whereinin a case in which, a sintered body prepared by sintering at 1550 °C a test specimen cut out from the layer LA is defined as sintered body SA, a sintered body at 1550 °C prepared by sintering a test specimen cut out from the layer LB is defined as sintered body SB, a contrast ratio of the sintered body SA at a sample having a thickness of 1 mm is defined as contrast ratio CA and a contrast ratio of the sintered body SB at a sample having a thickness of 1 mm is defined as contrast ratio CB, the contrast ratios CA and CB satisfy the following Formula (3),change directions of yttria concentration, alumina concentration and contrast ratio in a stacking direction are not changed by the at least two intermediate layers. Yttria concentration of layer LA−Yttria concentration of layer LB>1.0mol%0.0wt.%<0.3wt.%0.71≤Contrast ratio CA/Contrast ratio CB≤0.86
ZIRCONIA MILL BLANK HAVING LAYERS WITH DIFFERENT CONTENTS OF YTTRIA AND ALUMINA
To provide 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.[Solution]A zirconia mill blank for dental cutting and machining comprises at least two intermediate layers LA and LB which satisfy the following Formula (1) and Formula (2), wherein the layer LA is contained in a section A in which a distance from one plane of two planes is within 40 % of the distance between the two planes and the layer LB is contained in a section B in which a distance from the other plane is within 40 % of the distance between the two planes, whereinin a case in which, a sintered body prepared by sintering at 1550 °C a test specimen cut out from the layer LA is defined as sintered body SA, a sintered body at 1550 °C prepared by sintering a test specimen cut out from the layer LB is defined as sintered body SB, a contrast ratio of the sintered body SA at a sample having a thickness of 1 mm is defined as contrast ratio CA and a contrast ratio of the sintered body SB at a sample having a thickness of 1 mm is defined as contrast ratio CB, the contrast ratios CA and CB satisfy the following Formula (3),change directions of yttria concentration, alumina concentration and contrast ratio in a stacking direction are not changed by the at least two intermediate layers. Yttria concentration of layer LA−Yttria concentration of layer LB>1.0mol%0.0wt.%<0.3wt.%0.71≤Contrast ratio CA/Contrast ratio CB≤0.86
ZIRCONIA MILL BLANK HAVING LAYERS WITH DIFFERENT CONTENTS OF YTTRIA AND ALUMINA
ZIRKONDIOXIDFRÄSROHLING MIT SCHICHTEN MIT UNTERSCHIEDLICHEN GEHALTEN AN YTTRIUMOXID UND ALUMINIUMOXID
ÉBAUCHE DE FRAISAGE EN ZIRCONE AYANT COUCHES AVEC DIFFÉRENTS CONTENUS D'YTTRIUM ET D'ALUMINE
NONAKA KAZUMICHI (author) / TAKAHASHI SHUHEI (author) / TERAMAE MITSUJI (author)
2021-10-13
Patent
Electronic Resource
English
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