44.關於耐火模型(refractory cast)的製作下列何者錯誤?①可利用瓊膠(agar)的彈性,應直接將固化後的耐火模型自膠體中取出 ②要依照廠商指示進行混合調拌,以獲得合金鑄造收縮所需的膨脹補償率 ③需使用石膏研磨機加水研磨,以修整成適當外形 ④模型修整至接近蠟型設計範圍外至多 3~4 mm處,確保鑄造過程空氣能及時外逸
(A)僅①③
(B)僅②④
(C)僅①④
(D)①③④
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統計: A(369), B(197), C(224), D(344), E(0) #2743044
統計: A(369), B(197), C(224), D(344), E(0) #2743044
詳解 (共 5 筆)
#5892288
When dry, the cast is trimmed to within 6 mm of the proposed design. This is an essential step in ensuring the escape of gases during the casting process.Trimming is usually done on a dry cast trimmer to eliminate the possibility of a slurry mixture accumulating on the cast, changing its contours and dimensions.
跟FPD一樣,蠟型距離包埋材底部至少6mm,確保強度同時空氣可以外溢
資料來源:Clinical Removable Partial Prosthodontics, K. L. Stewart, K. D. Rudd and W. A. Kucbker, C. V. Mosby Co. 4e
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