Abstract
From the clinical point of view, it is important to know the dentin thickness between the cavity base and pulp chamber. The purpose of this study was to investigate the relationship between the electrical resistance and the thickness between the cavity base and pulp chamber in deciduous teeth.
Fifty-two newly extracted sound deciduous anterior teeth were subjected to mesurement of electrical resistance and to examination of serial specimens. Also the electrical resistance was mesured at 443 points.
The findings were as follows.
1) The teeth showed electrical resistance values over 1000 kΩ in the enamel cavities.
2) The electrical resistance values showed mostry under 600 kΩ, and showed a gradual decrease as the thickness of dentin decreased in the dentin cavities. However the great variation (1SD: 320μ) of the thickness of dentin at each electrical resistance values was shown.
3) The small variation (1SD: 180μ) of the thickness of the materials, the secondary dentins of which were resected, at each electrical value was shown. Also the relationship between the electrical resistance (xkΩ) and the thickness (yμ) of this materials was as follows. y=215.9 log(x)-647.0 (r=0.986)
