釉柱（enamel rod）是牙釉质的基本结构。柱是细长的柱状结构，起自釉质牙本质界，贯穿全层达牙的表面。
激光切割牙釉质：表面不平，无法污层，釉柱结构清晰可见，呈鱼鳞状。
Laser - cut enamel; the surfaces were not flat and devoid of a smear layer, with some evidence of prism structure, like fish scale.
棒状羟基磷灰石晶体可以排列或生长为束状，与人牙釉柱中的晶体在形态和尺寸上相似；
The rod-like hydroxyapatite may arrange or grow into bundles which are similar to the human enamel prisms in both appearance and size.
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