A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
COLORED LIGHT TRANSMISSIVE ZIRCONIA SINTERED BODY AND APPLICATION THEREFOR
PROBLEM TO BE SOLVED: To provide a dental material high in density and strength of a sintered body, and excellent color view extremely close to color view of teeth and light transmissivity, especially a colored light transmissive zirconia sintered body capable of being used for mill blank, tooth row bracket.SOLUTION: There is provided a colored light transmissive zirconia sintered body containing yttria of 2 to 4 mol%, ErOof 0.02 to 0.8 mol%, an iron compound of 20 to less than 2,000 ppm in terms of FeO, AlOof 0.005 to less than 0.2 wt.% and a remainder comprising zirconia, having brightness Lof 55 to 75, a* of 0 to 10, b* of 0 to 30, which are chromatic parameters as defined in accordance with JIS-Z8729, a relative density of 99.80% or more, and a total light transmittance of 18% or more and 40% or less as measured at a sample thickness of 1 mm using a D65 light source. There is also provided a colored light transmissive zirconia sintered body containing yttria of 2 to 4 mol%, cobalt oxide of less than 0.01 wt% in terms of CoO, an iron compound of 20 to less than 2,000 ppm in terms of FeO, AlOof 0.005 to less than 0.2 wt.% and a balance comprising zirconia, having brightness Lof 50 to 75, a* of -1 to 10, b* of 0 to 30, which are chromatic parameters as defined in accordance with JIS-Z8729, a relative density of 99.80% or more, and a total light transmittance of 18% or more and 40% or less as measured at a sample thickness of 1 mm using a D65 light source.SELECTED DRAWING: None
【課題】本発明の目的は、焼結体密度及び強度が高く、歯の色調に極めて近い色観と透光性に優れた歯科材料、特にミルブランク、歯列矯正ブラケットに使用可能な着色透光性ジルコニア焼結体を提供することにある。【解決手段】２〜４ｍｏｌ％のイットリア、０．０２〜０．８ｍｏｌ％のＥｒ２Ｏ３、Ｆｅ２Ｏ３換算で２０〜２０００ｐｐｍ未満の鉄化合物及び０．００５〜０．２ｗｔ％未満のＡｌ２Ｏ３を含み、残部がジルコニアであるジルコニア焼結体であって、ＪＩＳ−Ｚ８７２９に規定された色彩パラメーターの明度Ｌ＊が５５〜７５、ａ＊が０〜１０、ｂ＊が０〜３０であり、相対密度が９９．８０％以上、且つ、試料厚さ１ｍｍにおけるＤ６５光源による全光線透過率が１８％以上４０％以下であることを特徴とする着色透光性ジルコニア焼結体。２〜４ｍｏｌ％のイットリア、ＣｏＯ換算で０．０１ｗｔ％未満の酸化コバルト、Ｆｅ２Ｏ３換算で２０〜２０００ｐｐｍ未満の酸化鉄、０．００５〜０．２ｗｔ％未満のＡｌ２Ｏ３を含み、残部がジルコニアであるジルコニア焼結体であって、ＪＩＳ−Ｚ８７２９に規定された色彩パラメーターの明度Ｌ＊が５０〜７５、ａ＊が−１〜１０、ｂ＊が０〜３０であり、相対密度が９９．８０％以上、且つ、試料厚さ１ｍｍにおけるＤ６５光源による全光線透過率が１８％以上４０％以下であることを特徴とする着色透光性ジルコニア焼結体。【選択図】なし
COLORED LIGHT TRANSMISSIVE ZIRCONIA SINTERED BODY AND APPLICATION THEREFOR
PROBLEM TO BE SOLVED: To provide a dental material high in density and strength of a sintered body, and excellent color view extremely close to color view of teeth and light transmissivity, especially a colored light transmissive zirconia sintered body capable of being used for mill blank, tooth row bracket.SOLUTION: There is provided a colored light transmissive zirconia sintered body containing yttria of 2 to 4 mol%, ErOof 0.02 to 0.8 mol%, an iron compound of 20 to less than 2,000 ppm in terms of FeO, AlOof 0.005 to less than 0.2 wt.% and a remainder comprising zirconia, having brightness Lof 55 to 75, a* of 0 to 10, b* of 0 to 30, which are chromatic parameters as defined in accordance with JIS-Z8729, a relative density of 99.80% or more, and a total light transmittance of 18% or more and 40% or less as measured at a sample thickness of 1 mm using a D65 light source. There is also provided a colored light transmissive zirconia sintered body containing yttria of 2 to 4 mol%, cobalt oxide of less than 0.01 wt% in terms of CoO, an iron compound of 20 to less than 2,000 ppm in terms of FeO, AlOof 0.005 to less than 0.2 wt.% and a balance comprising zirconia, having brightness Lof 50 to 75, a* of -1 to 10, b* of 0 to 30, which are chromatic parameters as defined in accordance with JIS-Z8729, a relative density of 99.80% or more, and a total light transmittance of 18% or more and 40% or less as measured at a sample thickness of 1 mm using a D65 light source.SELECTED DRAWING: None
【課題】本発明の目的は、焼結体密度及び強度が高く、歯の色調に極めて近い色観と透光性に優れた歯科材料、特にミルブランク、歯列矯正ブラケットに使用可能な着色透光性ジルコニア焼結体を提供することにある。【解決手段】２〜４ｍｏｌ％のイットリア、０．０２〜０．８ｍｏｌ％のＥｒ２Ｏ３、Ｆｅ２Ｏ３換算で２０〜２０００ｐｐｍ未満の鉄化合物及び０．００５〜０．２ｗｔ％未満のＡｌ２Ｏ３を含み、残部がジルコニアであるジルコニア焼結体であって、ＪＩＳ−Ｚ８７２９に規定された色彩パラメーターの明度Ｌ＊が５５〜７５、ａ＊が０〜１０、ｂ＊が０〜３０であり、相対密度が９９．８０％以上、且つ、試料厚さ１ｍｍにおけるＤ６５光源による全光線透過率が１８％以上４０％以下であることを特徴とする着色透光性ジルコニア焼結体。２〜４ｍｏｌ％のイットリア、ＣｏＯ換算で０．０１ｗｔ％未満の酸化コバルト、Ｆｅ２Ｏ３換算で２０〜２０００ｐｐｍ未満の酸化鉄、０．００５〜０．２ｗｔ％未満のＡｌ２Ｏ３を含み、残部がジルコニアであるジルコニア焼結体であって、ＪＩＳ−Ｚ８７２９に規定された色彩パラメーターの明度Ｌ＊が５０〜７５、ａ＊が−１〜１０、ｂ＊が０〜３０であり、相対密度が９９．８０％以上、且つ、試料厚さ１ｍｍにおけるＤ６５光源による全光線透過率が１８％以上４０％以下であることを特徴とする着色透光性ジルコニア焼結体。【選択図】なし
COLORED LIGHT TRANSMISSIVE ZIRCONIA SINTERED BODY AND APPLICATION THEREFOR
着色透光性ジルコニア焼結体及びその用途
KAWAMURA KIYOTAKA (author) / FUJISAKI HIROYUKI (author)
2018-01-11
Patent
Electronic Resource
Japanese
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