A new scheme of an device for electrodiagnosis of caries is suggested, based on studies of dental hard tissue electric resistance. A highly sensitive M136 gage with 0.5 microA complete deviation current is employed in the scheme, this permitting measurements of high electric resistance of dental hard tissues within a range of 1-200 M omega, painless for patients. The device may be useful for the diagnosis of fluorosis, hypoplasia, incomplete enamel mineralization, enamel microfissures, abnormal wearing of dental hard tissue.
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