釔添加氧化鋯陶瓷兼具高強度的材料性質與美觀上的需求，近年來因此大量應用於CAD/CAM製作牙科全瓷冠及其補綴物。全瓷冠外表面因長時間接觸口腔環境，藉以拋光處理來達到良好的抗貼附及疏水特性。冠內表面則需與支台齒或自然牙以黏著劑進行鍵結，但因氧化鋯具生物惰性，與全鋯瓷冠中不含矽磷添加物，而無法藉由酸蝕處理與傳統矽磷類黏著劑產生化學鍵結。以機械性的氣動噴磨處理(Air-abrasion)之表面處理則能將氧化鋯內冠表面變得粗糙，進而提升黏著劑的沾附面積以達到良好的機械性嵌合黏著特性。
然而，以往憑靠人工經驗進行的噴磨處理，無法確切控制內冠表面的均勻性，更可能導致過度噴磨或牙冠邊緣損傷，導致後續補綴物的破裂及邊緣的微滲漏發生。除此之外，機械性的表面加工處理可使氧化鋯材料表面發生由四方晶系轉為單斜晶系的相變化，促使表面因相變而韌化並防止破裂裂紋的發展，也進而改善陶瓷材料的易脆特性問題。當相變化發生時，也可能伴隨無法避免的微缺陷產生，導致材料的破損從表面延伸至深處，最後誘發補綴材料的破壞。本研究因此將探討在釔添加氧化鋯材料表面，機械性的表面處理及人工時效水熱處理對材料表面及內部微結構及相變化之影響。
研究結果顯示，經由XRD量測與計算，拋光後的釔添加氧化鋯陶瓷材料經由48小時人工時效的水熱處理後，相變化影響深度從材料表面延伸至內部約8.7 μm 而且相變化率達到飽和70 %，透過Rietveld精修計算，四方晶格常數在a軸與b軸發生2.04 %膨脹，c軸則發生-1.11 %的壓縮應變。在EBSD中{220}_t 和{004}_t的菊池線寬計算，48小時人工時效處理前後的四方晶格常數受到應力影響，在a軸與b軸產生7.98 %的膨脹應變，c軸則發生-5.03 %的壓縮應變。在EBSD中的橫截面觀測中可經由IQ圖譜發現，CAD/CAM車削、研磨拋光及氣動噴砂等機械性表面處理，皆會誘發釔添加氧化鋯陶瓷材料表面發生應力誘發的相變化行為，並在材料表層產生塑性變形層和嚴重的破壞層剝落。經由水熱處理的釔添加氧化鋯材料，相變化則透過材料中氧空缺的填補由表面往材料內部延伸。

Regarding to the requirement of mechanical and aesthetic in current dentistry, the 3Y-TZP ceramics were applied with CAD/CAM technique. The external-crown surface of dental restorations suffers the oral environment with complex pH value, humidity, and occlusal forces, high anti-adhesion and hydrophilic properties. In the contrary, internal-crown surface with the roughened and hydrophobic properties is required for interlocked bonding to the resin substrate or true tooth. All-zirconia crowns cannot be bonded with etching process or traditional silica-based cement duo to the bio-inert property of zirconia-based ceramics. Thus, mechanical surface pre-treatments are widely used to improve the roughness and interlocking properties of 3Y-TZP materials.
However, air-abrasion process depends on experience of operators which leads to unpredicted impacts, such as uneven abrasive time and working angle and to damage of margin, cracks, and micro-leakage. Even the transformation toughening by phase transformation from unique tetragonal to monoclinic in zirconia ceramic can avoid the crack propagation, the formation of inevitable defects and the restoration failure. The first aim of this study is to examine the surface damage and transformed depth zone of tetragonal to monoclinic phase transformation by controlling the parameters of mechanical surface pre-treatment on 3Y-TZP ceramics. Second, it is to evaluate the microstructure and phase transformation of polished 3Y-TZP ceramics using hydrothermal ageing process with accelerated time.
As a result, the ageing behavior of polished CIP 3Y-TZP under 2 hours to 48 hours hydrothermal ageing process can be described by MAJ laws. The fraction of monoclinic gets saturated around 70%, and the depth is 8.7 μm t after 48 hours hydrothermal ageing process. In Rietveld refinement of XRD, the strain of a- and c-constant corresponds to 2.04 % and -1.11 %. Band widths of {220}_t and {004}_t in Kikuchi patterns are calculated using EBSD results, and the strain of a- and c-constant is 7.98 % and -5.03 % before and after 48 hours hydrothermal treatment.

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