弄丢钥匙已是惨事一桩，要是因为没有备用钥匙而必须重新换锁，那更是雪上加霜了，还不算其昂贵的成本。
Losing your keys is bad enough, but having to replace the entire lock because you don't have a key to copy makes things even worse - not to mention expensive.
方法：从6颗离体的形态正常的人右下颌第一磨牙中，选取密合度最好且形态接近临床要求的1颗进行根管治疗，制作制锁式的带桩嵌体修复体。
METHODS: 1 of the 6 first mandibular molars on the right side with normal morphology in vitro was selected for pulpectomy, which was the best in density and near to clinical requirement in morphology.
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