Apparatus and method for measuring the moisture level within...

A - Human Necessities – 61 – B

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A61B 5/05 (2006.01) A61B 5/053 (2006.01) G01N 27/04 (2006.01)

Patent

CA 2338268

A probe comprising two spaced electrodes is provided between which electrical resistance through enamel, dentine or tooth tissue is measured. The electrodes comprise inner and outer coaxial electrodes spaced by an insulating layer. The diameter of the probe is preferably 1 mm. The tip of the probe may be shaped to match the surface being measured. The signal from the probe is A to D converted for analysis. The rate of change of resistance gives a measure of the rate of change of moisture level (porosity). The porosity is related to tooth sensitivity and so the system can provide an objective measurement of tooth sensitivity.

L'invention concerne une sonde comprenant deux électrodes espacées entre lesquelles on mesure une résistance électrique dans l'émail, la dentine ou le tissu dentaire. Les électrodes se composent d'électrodes coaxiales intérieures et extérieures séparées par une couche isolante. Le diamètre de la sonde est de préférence de 1 mm. La pointe de la sonde peut être formée de manière à être adaptée à la surface mesurée. Le signal provenant de la sonde est soumis à une conversion analogique-numérique pour être analysé. Le taux de changement de la résistance donne une mesure du taux de changement du niveau d'humidité (porosité). La porosité est liée à la sensibilité dentaire et ainsi, le système permet d'obtenir une mesure objective de la sensibilité dentaire.

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