牙科在无局麻的情况下,于牙齿表面上操作会引起疼痛。当牙本质遇到温度、渗透压改变或电刺激时,当凉风或各种药物应用于牙齿表面时,常产生疼痛,我们称之为“牙本质疼”。尽管组织化学和电子显微镜研究已经生动描写了造牙本质细胞和牙髓神经纤维之间的关系,仍是牙木质到末稍神经的疼痛传导之机理仅仅是个假说。作者提到四个学说,其中液体动力学说是最有说服力的。换能器学说:考虑到造牙本质细胞突起与终末感觉神经末端之间有“胞突接合样”关系,所以提出这种学说。如果在造牙本质 Dental surgery in the absence of local anesthesia can cause pain on the surface of the tooth. When dentin encounters temperature, changes in osmotic pressure or electrical stimulation, pain often occurs when cool breeze or various drugs are applied to the tooth surface, which we call “dentin pain.” Although histochemical and electron microscopic studies have vividly described the relationship between dentin and endodontic nerve fibers, the mechanism of pain conduction from the woody to the aponeurotic nerve is merely a hypothesis. The author mentions four theories, of which the theory of fluid dynamics is the most convincing. Transducer theory: This theory is proposed considering that there is a “synapse-like” relationship between the process of axonotomy and the terminal sensory nerve end. If the dentine essence