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An electrical method for examining remaining dentine thickness.

H Yoshida, M Tsuji, H Matsumoto

    Journal of Dentistry
    |December 1, 1989
    PubMed
    Summary
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    Electrical impedance measurements show a positive correlation with remaining dentine thickness (RDT) in dog teeth. However, variations indicate electrical methods are unreliable for precise RDT determination, requiring 40 k omega impedance to prevent bacterial contamination.

    Area of Science:

    • Dental materials science
    • Biophysics

    Background:

    • Accurate assessment of remaining dentine thickness (RDT) is crucial for preventing pulpal contamination.
    • Electrical impedance measurements offer a potential non-invasive method for evaluating RDT.

    Purpose of the Study:

    • To correlate electrical impedance measurements with RDT in canine teeth.
    • To evaluate the reliability of electrical impedance for determining RDT and preventing bacterial contamination.

    Main Methods:

    • Cylindrical cavities were prepared in 78 dog teeth.
    • Electrical impedance was measured between the cavity floor and oral mucous membrane using a caries meter.
    • Impedance values were correlated with measured RDT.

    Main Results:

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  • A statistically significant positive correlation (P < 0.01) was observed between RDT and impedance in both upper and lower premolars.
  • Significant variation in RDT was noted at impedance values below 30 k omega.
  • An impedance threshold of 40 k omega was suggested to prevent bacterial contamination.

    • Conclusions:

    • Electrical impedance measurements alone are insufficient for precise RDT determination due to measurement errors and variability.
    • A minimum impedance of 40 k omega is recommended to ensure pulpal protection against bacterial invasion.