Hoppenbrouwers P M, Scholberg H P, Borggreven J M
J Dent Res. 1986 Feb;65(2):154-7. doi: 10.1177/00220345860650021301.
To investigate the permeability of the dental enamel of erupted and unerupted human pre-molars and its variation with depth, we determined the resistivity of successive 100-micron-thick layers. The electrical resistance of halved tooth crowns at zero Hertz, which according to Scholberg et al. (1982, 1984) is inversely related to the permeability, was measured before and after removal of successive enamel layers from the outer surface toward the dentino-enamel junction (D.E.J.). The resistivity of the successive enamel layers increased from the D.E.J. toward the outer surface in approximately the same way in erupted as well as in unerupted pre-molars, except within the outermost layer of 100 to 200 microns thickness. The resistivity of this layer in erupted pre-molars was considerably higher than that in unerupted pre-molars, which may be due to post-eruptive mineralization.
为了研究已萌出和未萌出的人类前磨牙牙釉质的渗透性及其随深度的变化，我们测定了连续100微米厚各层的电阻率。在从外表面朝牙本质-牙釉质交界（D.E.J.）逐层去除牙釉质之前和之后，测量了零赫兹下半个牙冠的电阻，根据肖尔伯格等人（1982年、1984年）的研究，该电阻与渗透性成反比。连续牙釉质层的电阻率从D.E.J.向外表面增加，已萌出和未萌出的前磨牙情况大致相同，但在最外层100至200微米厚度范围内除外。已萌出前磨牙中该层的电阻率明显高于未萌出前磨牙，这可能是由于萌出后矿化所致。
