Developed by
BRETSCHI, J.*, D'HOEDT, B.**, FREY,
D.*, GUDAT, H.*, HOHMANN, E. (Bensheim), KÖNIG, M.*, LUKAS,
D.**, MARKL, M.*, QUANTE, F.*, SCHOLZ, F.**, SCHULTE, W.**, TOPKAYA,
A.*, WOHLGEMUTH, J. (Bensheim)
* Fraunhofer Society, Karlsruhe,** Clinic of Oral Surgery and
Periodontology, Univ. Tübingen
Supported by Volkswagen Foundation, German Research Community (DFG), Federal Ministry of Research and Technology (BMFT)
Formerly manufactured by Siemens(internet-link: "http://www.siemens.de/med/dental/")
Dental
now by Gulden-Meßtechnik, both D-64625 Bensheim an der Bergstraße,
Germany
Delivered by authorized dental-depots
THE MANNER OF OPERATING:
SCHEMATIC SECTIONAL VIEW
The Periotest technique involves electronically controlled and reproducible percussion of tooth produced by the propulsion coil. The measuring coil ensures the velocity of the tapping head is constant at 0.2 m/s by compensating friction and gravitation. The 'Periotest value' is calculated from the signal of the accelerometer. The Periotest measures the reaction to a reproducible impact applied to the tooth crown. The elastic and viscous properties of the periodontium and the surrounding bony tooth socket are to a large extent non-linear. The visco-elastic properties of a healthy tooth enabling the percussion of the Periotest tapping head to be decelerated in less than 1 ms are largely lost in periodontitis. It is this essential difference which the Periotest method utilizes.
The Periotest value depends to some extent on tooth mobility, but mainly on the visco-elastic characteristics of the periodontium. The Periotest value is in itself a biophysical parameter, such as the blood pressure. The Periotest value is generally not elevated with infection of the gingivae as this is no periodontal destruction
This microcomputerized measuring, steering and speech synthesis systems allows it to quantify in a numeric scale the elasticity of the tissue-implant binomium.
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THE PERIOTEST HANDPIECE HAS TO BE HELD HORIZONTAL
AND .... |
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RIGHT-ANGLED TO THE TOOTH AREA UNDER TEST |
The point of percussion in routine applications using the standard technique is the centre of the facial surface of the anatomical (not the clinical) crown.
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Siemens(http://www.siemens.de/med/dental/)