某患者,一上前牙牙冠大部缺损,做桩冠修复时,根管制备的长度应达根长的A.40911B.3/5~4/5C.1/5~2/5D.1/4~1/2E.2/3~3/4

某患者,一上前牙牙冠大部缺损,做桩冠修复时,根管制备的长度应达根长的

A.40911

B.3/5~4/5

C.1/5~2/5

D.1/4~1/2

E.2/3~3/4


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