当牙齿的齿质剩下不多时候，若要做牙冠，则必须在牙根内打钉子，做上冠心，以做出牙齿必要的假牙支撑部分。
When the ivory of teeth not much time left, to Crown, you must hit the nail in the teeth, coronary heart on doing, necessary to make teeth denture supporting parts.
当牙齿的齿质剩下不多时候，若要做牙冠，则必须在牙根内打钉子，做上冠心，以做出牙齿必要的假牙支撑部分。
When the ivory of teeth not much time left, to Crown, you must hit the nail in the teeth, coronary heart on doing, necessary to make teeth denture supporting parts.
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