牙齿外伤时最易发生折断的部位是 ( )A.尖牙区 B.磨牙区 C.各区都易发生牙折 D.前磨牙区 E.前牙区

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问题牙齿外伤时最易发生折断的部位是 ( )

选项 A.尖牙区 B.磨牙区 C.各区都易发生牙折 D.前磨牙区 E.前牙区

答案 E

解析

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