RU133940U1 - DEVICE FOR MEASURING GEOMETRIC VOLUME PARAMETERS OF PRESSURE ALGINATE MATERIALS - Google Patents

Abstract

A device for measuring geometric volumetric parameters of impression alginate materials, containing a tripod, on which a container with a test sample is mounted, on the upper cut of which a metal electrode is mounted, a dial gauge connected to a rod for supplying the surface of the test sample, and a micrometer screw mounted with the possibility impact on the lever for smooth movement of the rod connected to the rod and electrode display circuit, consisting of a power source, milliammeter, ballast oprotivleniya and flexible conductors.

Description

The device relates to dentistry. Used to determine changes in the geometric volumetric parameters of alginate impression materials used in dentistry. It is known that dental impression alginate materials in the process of their use can change their volumetric parameters, which can lead to a negative result of treatment. To prevent this, materials that are most stable in volumetric parameters should be used. Alginate materials do not have a special instrument in dentistry to measure these parameters.

Objective: to develop a reliable instrument for measuring geometric volumetric parameters of alginate materials.

Figure 1 schematically shows a device for measuring geometric volumetric parameters. The device consists of 1 - tripod, 2 - hour indicator, 3 - indicator rod, 4 - lever for smooth movement of the indicator rod, 5 - micrometer screw, 6 - electrode, 7 - capacity, 8 - test sample, 10 - touch indication circuit, 11 - power supply, 12 - milliammeter, 13 - ballast resistance, 14 - flexible conductors.

This device uses a dial indicator 2. It is a lever-toothed multi-turn measuring head 1 MIG GOST 9996-82 with a division value of 0.001 mm (μm) and the ability to measure linear movements in the range of 1 mm. The limit of the basic permissible error in the entire measurement range for this type of device is 1.8 μm.

The principle of operation of this device is as follows. The test sample 8 is placed strictly vertically in the container 7, and a light metal electrode 6 is installed on the upper cut. Then, using the micrometer screw 5 acting on the lever 4, the rod of the clock indicator 3 smoothly leads to the surface of the test sample (in this case, to the electrode 6) . The moment of contact of the rod and electrode is instantly fixed by the indication circuit 10 (milliammeter 12 began to show the passage of current in the electrical circuit). From this moment, the rotation of the micrometer screw 5 is stopped and the clock indicator 2 is recorded. Measurement of geometric dimensions during disinfection in a solution of hydrogen peroxide, alginate impression material “Ortoprint”. To measure changes in the geometric volumetric parameters of the material under study, an experimental sample was made in the form of a cube 10 * 10 * 10 mm. The test sample was placed in a container with a disinfecting solution of hydrogen peroxide of the device for measuring geometric volumetric parameters, then with the help of a micrometer screw acting on the lever, the rod of the clock indicator is smoothly brought to the surface of the test sample. The moment of contact of the rod and electrode was instantly fixed by the display circuit. The measurements were carried out 20 and 40 minutes after the introduction of the experimental sample into the disinfectant solution. The results obtained: after 20 minutes, the increment in the length of the sample was 0.27 mm, after 40 minutes, the increment in length was 0.3 mm. Thus, with the help of this study, it becomes possible to determine the optimal working time for disinfection of the impression, without changing its volumetric parameters.

INFORMATION SOURCES

1. Abstract "A comparative analysis of the influence of phyto- and official disinfectants on the structure and volumetric parameters of alginate impression masses." - Guskov A.V., Ryazan, 2008.

Claims (1)

A device for measuring geometric volumetric parameters of impression alginate materials, containing a tripod, on which a container with a test sample is mounted, on the upper cut of which a metal electrode is mounted, a dial gauge connected to a rod for supplying the surface of the test sample, and a micrometer screw mounted with the possibility impact on the lever for smooth movement of the rod connected to the rod and electrode display circuit, consisting of a power source, milliammeter, ballast oprotivleniya and flexible conductors.

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