题目：
患者，女，30岁。
外伤后牙冠大部分缺损，伴牙周膜挤压伤，已行完善根管治疗。咬合关系正常，拟为该患者行烤瓷桩冠修复。桩冠预备时，一般要求根尖部保留的充填材料长度是（）
A．不用保留
B．1～2mm
C．2～3mm
D．3～5mm
E．5～7mm
答案：
参考答案：D
解析：
桩核冠修复时，要保证根尖不少于4mm的根尖封闭。
患者，女，30岁。外伤后牙冠大部分缺损，伴牙周膜挤压伤，已行完善根管治疗。咬合关系正
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