Electrical Resistance Correlation with Tactile Examination on Occlusal Surfaces

Williams, David L.; Tsamtsouris, A; White, G. Edward

doi:10.1177/00220345780570011401

Cited by 11 publications

(2 citation statements)

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“…A problem encountered in many studies is the large variation: The standard deviation of electrical resistance measurements is often 100% of the mean value for a series of measurements. Moreover, reported resistance values vary considerably (Williams et al, 1978;Sawada et al, 1986).…”

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confidence: 99%

Temperature Dependence of the Electrical Resistance of Sound and Carious Teeth

et al. 2000

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Temperature variations are expected to influence measurement error in electrical resistance of teeth. It was the aim of this study to determine the changes in electrical behavior of extracted human teeth due to temperature changes in the range of room temperature to intra-oral temperature. Nine extracted teeth were selected, and the occlusal or an approximal surface was chosen for measurement. Carious involvement of the surfaces ranged from sound to cavitated. Electrical impedance spectroscopy sweeps in a frequency range of about 100 kHz to 10 Hz were completed at selected temperatures between 22 degrees C and 40 degrees C. After fitting the data to equivalent circuits that yielded parameter values for components of the equivalent circuit, we calculated the dc bulk resistance (Rh). The temperature dependence of Rb of the surfaces with different carious involvement was very similar, and the mean drop of Rb from 20 to 35 degrees C was 45% (SD 2%). It was concluded that the electrical resistance of sound and carious tooth surfaces is inversely related to temperature.

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Section: Introductionmentioning

confidence: 99%

Temperature Dependence of the Electrical Resistance of Sound and Carious Teeth

et al. 2000

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“…1986], Rock and Kidd [1988] found a relationship be tween electrical conductance measurements and enamel dé calcification. Carious lesions penetrating the dentin from the base o f the fissure could be detected under both in vitro and in vivo conditions by measuring the electrical conduct ance of the enamel [White ctal., 1978;1981;Williams et al, 1978: Flaitz et al, 1986Verdonschot et al. 1992Verdonschot et al.…”

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confidence: 99%

Validity of Electrical Conductance Measurements in Evaluating the Marginal Integrity of Sealant Restorations

1995

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The use of sealants and sealant restorations has increased considerably over the past 10 years, and with it increased the problem of detecting secondary caries and marginal (micro)leakage. It was the purpose of this study to investigate the validity of electrical conductance measurements (ECMs) in diagnosing marginal leakage into dentine of sealants and sealant restorations. Ninety extracted premolar teeth were divided into three groups. Initial ECMs, denoted ‘baseline ECMs’, were conducted in all three groups by placing the probe tip of an Electronic Caries Monitor in the occlusal fissure which was filled with a dentifrice. The ECMs were divided by the area, yielding ECM/mm2 values. In group A 30 teeth were treated to receive ‘nonleaking sealants’. In the 30 teeth of group B a narrow groove was cut at the occlusal surface reaching the dentine and restored by the application of a sealant without etching of the adjacent enamel to create a high probability of marginal leakage. The samples in group C received the same treatment as those in group B, but in this group the enamel was etched to reduce the probability of marginal leakage. The ECMs subsequently conducted were denoted ‘sealed/restored ECMs’. Teeth in groups B and C were thermocycled 700 times (4–67°C) to provoke leakage, after which ECMs were conducted (denoted ‘ECMs after thermocycling’). The teeth were immersed in fuchsin for 24 h and cut along the fissure system to validate marginal leakage. The electrical conductance decreased significantly from baseline to the sealed/restored stage in all groups (p < 0.05). The electrical conductance per unit area increased in groups B and C after thermocycling. The electrical conductance, irrespective of area, increased significantly after thermocycling (p < 0.05) only in group C. The sensitivities of ECMs per unit area and ECMs were 0.98 and 1.00, respectively, and the specificities were 0.77 and 0.79, respectively. The areas under the receiver operating characteristic curves of ECMs per unit area and ECMs were 0.94 and 0.96, respectively There was no significant difference between the areas under both curves (p > 0.05), denoting that ECMs need not necessarily be expressed relative to the area of the electrode. It was concluded that marginal leakage into dentin of sealants and sealant restorations can be accurately detected by ECM.

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