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PubMed · 1286926

The Periotest method.

W Schulte·D Lukas
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Abstract

The Periotest is a new instrument for the diagnosis of periodontal diseases. The 'Periotest value' depends to some extent on tooth mobility, but mainly on the damping characteristics of the periodontium. The Periotest measures the reaction to a reproducible impact applied to the tooth crown. The Periotest value is a biophysical parameter.

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Electronics, MedicalEquipment DesignFemaleHumansMalePercussionPeriodontal DiseasesPeriodonticsJournal ArticleResearch Support, Non-U.S. Gov'tReview

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W Schulte, D Lukas. 1992. The Periotest method.. https://pubmed.ncbi.nlm.nih.gov/1286926/

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Pupillometer for clinical applications using dual 256-element linear CCD arrays.

A new pupillometer for measuring the size of the pupil of the human eye is described. It uses two inexpensive 256-element charge coupled device (CCD) arrays in an orthogonal configuration. The system is controlled and data are analysed by means of a Z80A microcomputer. Software allows the position and diameter of the pupil to be displayed on a monochrome video monitor. Infra-red diodes irradiate the eye so that measurements can be made in darkness. The accuracy is better than +/- 0.1 mm, over the range 3.2-9.5 mm. Dynamic measurements of the pupil light reflex response can be made with sampling periods as short as 20 ms.

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