49.下列何者不是鑄造金屬嵌體固位(retention)的主要來源?
(A)垂直壁(vertical wall)儘量平行
(B)咬合斜面(occlusal bevel)和牙齦斜面(gingival bevel)
(C)在鄰接面盒(proximal box)頰舌側做固位溝(retention groove)
(D)將咬合面窩洞延伸到顏側/舌側面溝(facial/lingual surface groove)
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統計: A(107), B(852), C(44), D(110), E(0) #2626124
統計: A(107), B(852), C(44), D(110), E(0) #2626124