46.牙科用二氧化鋯常會添加穩定劑三氧化二釔(Y2
O 3),主要目的是希望在室溫時能增加那種晶相的穩定性?
(A)單斜晶相(monoclinic phase)
(B)四方晶相(tetragonal phase)
(C)立方晶相(cubic phase)
(D)體心立方晶相(body-centered cubic phase)
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統計: A(427), B(1255), C(121), D(319), E(0) #2180780
統計: A(427), B(1255), C(121), D(319), E(0) #2180780
詳解 (共 5 筆)
#7278437

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#7272319
高透明度的牙科用二氧化鋯(如DD Cube X2, Vita YZ XT)會添加5 mol%以上穩定劑三氧化二釔(Y2O3),使室溫時立方晶相(cubic phase)佔50%以上,以改善傳統二氧化鋯的美觀問題[1],因此(C)選項也是正確的,不知是否有人申訴。
不過硬要單選的話,我想還是選(B)吧,畢竟四方(t)至單斜(m)的transformation toughening(如圖[2])比透明度重要。
立方二氧化鋯為面心立方(face-centered cubic)晶格[3],(D)選項錯誤。

- Ban S. Classification and properties of dental zirconia as implant fixtures and superstructures. Materials 2021;14:4879. https://doi.org/10.3390/ma14174879.
- Huang B, Chen M, Wang J, et al. Advances in zirconia-based dental materials: Properties, classification, applications, and future prospects. J Dent 2024;147:105111. https://doi.org/10.1016/j.jdent.2024.105111.
- Cyriac B. Zirconia: Synthesis and Characterization. In: Al-Naib UMB, editor. Zirconia, Rijeka: IntechOpen; 2023. https://doi.org/10.5772/intechopen.111737.
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#6288518
有打德撲的,看過大泓老師的拜四方吧,拜完心裡平靜,自然穩定,選四方總沒錯
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