“The seventh edition of the Glossary of Endodontic Terms defines the working length of a tooth as the distance from a coronal reference point to the point at which canal preparation and obturation should terminate. ” 工作长度：从牙齿冠方的参考标志点到根备、根充止点的距离。 到底是先有蛋还是先有鸡呢？很多简单的问题越想越糊涂......