26.對於根管治療後的牙齒進行永久贋復物製作時,下列敘述何者錯誤?
(A)有2 mm冠部齒質以提供圍箍效應(ferrule effect)
(B)根柱(post)在根尖區的寬度最多可達牙根寬度的一半
(C)根柱(post)的深度應達到牙根長度的一半
(D)根尖部根管需至少留有5 mm的馬來膠充填
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統計: A(15), B(790), C(69), D(44), E(0) #1846106
統計: A(15), B(790), C(69), D(44), E(0) #1846106
詳解 (共 3 筆)
#7415191
C?
An ideal dental post length should be equal to or greater than the height of the clinical crown, and span at least 2/3 of the root length. Crucially, the post must leave at least 4 to 5 mm of gutta-percha at the root apex to maintain an adequate seal and prevent reinfection.
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