迄今对牙本质中神经纤维的存在和性质持有不同意见,有些学者提出人类和动物牙本质中仅部份地有神经分布,神经纤维未延展至内层牙本质小管的1/3以外,而光学和电子显微镜研究也不能透彻地解释釉牙本质界地区外周牙本质的敏感问题。鉴于此,作者以氚标记脑氨酸(~3H—L—脯氨酸)注射 So far, there is disagreement on the existence and nature of nerve fibers in dentin, and some scholars have suggested that there is only a partial distribution of nerves in human and animal dentin, with the nerve fibers not extending beyond 1/3 of the inner dentinal tubules, whereas Optical and electron microscopy studies also do not provide a thorough explanation of the sensitivity of the dentin in the enamel dentin region. In view of this, the authors injected with tritium-labeled leucine (~ 3H-L-proline)