48.利用假象(illusions)的方式可讓門牙的寬度及長度看起來與實際不同,下列敘述何者正確?
(A)牙齦輪廓高度(gingival height of contour)靠近牙齦(gingivally),可讓門牙看起來較短
(B)垂直發育溝(vertical developmental depressions)較明顯,可讓門牙看起來較長
(C)近遠心線角(mesial and distal line angles)相距較近,可讓門牙看起來較寬
(D)發育溝(developmental depressions)相距較遠,可讓門牙看起來較窄

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統計: A(38), B(837), C(10), D(26), E(0) #1846128

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