通过显微镜观察，可见到牙本质内有许多排列规则的细管，通常表现为感受外界冷、热、酸、甜等刺激，而引起疼痛。
备牙时牙本质暴露率达95 16 % ，粘固后牙本质过敏症状不同程度缓解。
The dentin exposure rate was 95 16%. The dentin sensitivity relaxed after PLV bonded.
氟化钠组根面亦可见明显的划痕，暴露的牙本质小管部分被封闭，在根面可见大小不一散在的指状结构；
NaF group also had significant root surface scratches, exposed dentinal tubules were partially closed and scattered finger-like structures are also visible on the root surface;
方法将因正畸需要拔除的60颗前磨牙制成试样块并用树脂包埋，一面暴露作为测试面，去除其釉质暴露浅层牙本质并用砂纸磨平。
Methods The 60 premolars were made into test pieces and embedded with resin. One side was exposed as a test surface, with its enamel removed and superficial dentin polished with sandpaper.
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