【評論主題】49.當嵌體窩洞修形後較深的地方,決定要以氫氧化鈣糊劑做覆髓,其周邊至少需露出多少牙本質,以供玻璃離子黏合劑做為基底的操作?(A)0.2~0.4 mm(B)0.5~1.0 mm(C)1.1~1.5 m
【評論內容】Art and science P.315 ☆☆ ☆☆☆☆☆☆...
【評論主題】42.複合樹脂光聚合時,有關光穿透的深度的敘述,下列何者錯誤?(A)光強度(light intensity)會影響光穿透的深度 (B)複合樹脂無機填料的顆粒大小及含量會影響光穿透的深度 (C)複合樹脂
【評論內容】
Phillips' Science ☆☆ ☆☆☆☆☆☆ ...
【評論主題】40.以雙酚醇基丙烯酸甲酯(bis-GMA)為基質之複合樹脂常用之偶合劑(coupling agent),下列何者正確?(A)羥基胺類(hydroxylamine) (B)環氧類(epoxy) (C)
【評論內容】
Phillips' Science of Dental Materials, 12e. P.278
In 1962, Bowen developed a new type of composite mate- rial that largely overcame these problems. Bowen’s main innovations were bisphenol-A glycidyl dimethacrylate (bis- GMA), a monomer that forms a cross-linked matrix that is highly durable (see Chapter 6), and a surface treatment utilizing an organic silane compound called a coupling agent to bond the filler particles to the resin matrix.
【評論主題】48.傳統牙科用瓷(porcelain)中添加鉀離子或鈉離子會造成玻璃質基質(glassy matrix)何種影響?(A)降低熱膨脹係數 (B)破壞SiO4結構 (C)阻止白榴石(leucite, K
【評論內容】Phillips' Science of ☆☆☆☆☆☆ ...
【評論主題】47.各種製程的全瓷(all-ceramic)材料,其強度由高到低的排列順序為何?①玻璃滲透氧化鋯(glass-infiltrated zirconia) ②玻璃滲透氧化鋁(glass-infiltr
【評論內容】Phillips' Science of ☆☆☆☆☆☆ ...
【評論主題】44.包埋材可能導致鑄造體型態不完整(incomplete casting)的因素,下列何者正確?①粉末顆粒大小 ②包埋液調拌的溫度 ③包埋粉中結合劑(binder)的含量 ④鑄型(casting m
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【評論主題】36.牙科用不銹鋼材料中主要元素鉻(Cr)的含量(wt%)範圍為何?(A)1~10 (B)11~30 (C)31~50 (D)51~60
【評論內容】
Phillips' Science of Dental Materials, 12e P.406
When approximately 12% to 30% chromium by weight is added to carbon steel, the alloy is commonly known as stain- less steel.
國考參考書第406頁有提到完整敘述,請解答提出國考參考書之內容,以免產生爭議
【評論主題】41.下列何者不是牙科用複合樹脂的分類方式?(A)填料大小 (B)光透射程度 (C)聚合方式 (D)臨床使用方式
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【評論主題】39.關於義齒床樹脂(denture base resin)的吸水性(water absorption),下列敘述何者錯誤?(A)樹脂PMMA吸水會使體積稍微膨脹 (B)若樹脂PMMA吸水重量每增加1
【評論內容】Phillips' Science of ☆☆☆☆☆☆ ...
【評論主題】38.化學聚合樹脂(chemically activated denture base resin)相較於一般熱聚合樹脂(heat-activated denturebase resin),下列敘述何
【評論內容】Phillips' Science of ☆☆☆☆☆☆ ...
【評論主題】34.有關加成式矽化物(addition silicone)印模材的敘述,下列何者錯誤?(A)聚合過程中會釋放出氫氣,可能是從Si-H unit而來 (B)如果用石膏倒模,要等30分鐘以上才可倒模 (
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無其餘選項描述之根據,雖C確定錯誤,但無法說明其餘選項沒有錯誤的可能性
事實上A選項在P.155的圖可以發現Si旁有四個化學鍵,其中兩個與氧鍵結形成聚合物,另一為CH3屬安定官能基,可反應的基團只有H
C,D選項在P.154Addition silicone標題下第二段最後三行
Manufacturers may add a noble metal, such as palladium, as a scavenger for the released hydrogen gas. The impression should be left overnight if epoxy will be used for pouring models.
【評論主題】29.對非晶質材料(noncrystalline structure)及其性質的描述,下列何者錯誤?(A)沒有固定熔點 (B)高於玻璃轉換溫度(Tg),熱膨脹係數急速下降 (C)低於玻璃轉換溫度(Tg
【評論內容】
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