Electrical conductance (fixed frequency) method

30-03-2010
Electrical conductance (fixed frequency) method
Electrical methods of caries diagnosis are not new. There has been recent revival of interest in fixed frequency electrical devices, which show considerable promise for detection of occlusal and approximal lesions. A device is now commercially available in The Netherlands; similar machines were produced in the United States and in Japan some years ago.
 
The electrical detection methods are seen by many as having the greatest potential for significantly improving diagnostic performance in the years to come. For occlusal surfaces, the commercially available fixed frequency devices have repeatedly shown high sensitivity and specificity for enamel lesions. For lesions in dentin, sensitivity is high, although specificity is only moderate. There are special difficulties in applying this method to approximal surfaces, but recent data show that these can be overcome and that sensitivity is high at both the D1 and D3 levels. Specificity appears to be high at the D1 level, but may be a little lower (moderate) for D3 (Pitts et al, 1995).
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