42.關於上顎第一小臼齒的敘述，下列何者錯誤？
(A)從咬合面觀，通常有近心邊緣嵴溝(mesial marginal ridge groove)
(B)從咬合面觀，近心邊緣嵴(mesial marginal ridge)的長度通常比遠心邊緣嵴短
(C)通常在牙冠及牙根的近心面會出現凹陷(mesial concavity)
(D)頰側咬頭的尖端(buccal cusp tip)較偏向近心側

答案：登入後查看
統計： A(29), B(155), C(31), D(487), E(0) #1038968

詳解 (共 3 筆)

#2919442
上顎第一小臼齒 頰側咬頭尖端（bucc...
(共 69 字，隱藏中）
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17
0
#3465155
偏遠心：#53 #14偏近心：#83 #...
(共 36 字，隱藏中）
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8
0
#5674899

F2.png
A. A “mesial marginal developmental groove” 偶爾出現，並 extends from the central developmental groove and crosses the mesial marginal ridge and ends on the mesial surface of the crown.

B.Different from other teeth, mesial marginal ridge of maxillary first premolar teeth is shorter than distal marginal ridge. 

C. The mesial contour of the crown presents a shallow concavity extending from the cementoenamel junction to the mesial contact area.

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