RU1827218C - Device for determining force upon tooth to be displaced at treating with the aid of orthodontic apparatus - Google Patents

Abstract

Usage: medicine, in particular orthopedic dentists. SUMMARY OF THE INVENTION: the device comprises a plate mandibular retainer 1 with a body 2 fixed on it, the cavity of which is filled with fusible material 3, in which an elastic element 4 is mounted cantilever, having a curved section extending from a vertical flat section 5, and a section connected with it. made with the possibility of interaction with the palatal surface of the moved tooth. 1 ill.

Description

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The invention relates to medicine, and more specifically, to devices for determining the interaction forces of movable teeth and the elastic inclined plane of functional guiding devices (NPFNA) during chewing, swallowing, and speech; as well as the ultimate endurance of the periodontium along the functional axis directly in the patient's oral cavity before treatment and during the movement of the teeth.

The purpose of the invention is to increase the accuracy of determining functional forces on a tooth and its ultimate endurance along the axis of functional loading.

The goal is achieved in that the device further comprises a removable mandibular retainer, the housing is fixedly connected to the retainer and has a cavity filled with fusible material, in which an elastic element with a curved section is cantilevered

and communicated with him plot made with the possibility of interaction with the palatal surface of the tooth.

The drawing shows a device.

The device comprises a plate mandibular fixator 1, with a body 2 fixed on it, the cavity of which is filled with fusible material 3, in which an elastic element 4 is cantilevered, having a curved section, which is a continuation of the vertical flat section 5, and a section made with it, made with the ability to interact with the palatal surface of the moved tooth. The vertical flat section 5 with the lower end is snapped in the low-melting material in a position identical to its position in the medical device and providing contact of the communicated section of the elastic element with 1/3 of the palatal surface of the upper tooth and 1/3

with

N5 h | N5

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the vestibular surface of the lower anterior teeth. Strain gages 6 are glued on both surfaces of the vertical flat portion, which are electrically connected in a known manner to a recorder (not shown conventionally).

The device operates as follows.

A device prepared in advance in the occluder is inserted into the oral cavity and the patient is asked to maximize jaw compression to feel a slight pain in the examined tooth. In this case, the upper tooth acts on the communicated portion of the elastic element 4, causing its deformation (deformation of the curved, vertical and communicated sections), which leads to the deformation of the strain gauges 6 and the appearance of an electrical signal recorded by the apparatus. This procedure is repeated several times to determine the maximum value of ultimate endurance. Then the patient is offered to chew and swallow a dosage of chewing load, to conduct test colloquial speech. Studies are carried out several times to measure, record the deformations of the elastic element and, accordingly, the forces on the moved tooth during chewing, swallowing, and speech. After examination, the patient uses a treatment apparatus with an elastic inclined plane (HA) with identical parameters and geometric shape. During the treatment process and as the functional adaptation to the apparatus is performed, the alternating forces dosed by the patient themselves change in magnitude. This is due to the restructuring of the neuromuscular regulation complex, which affects the dosage of efforts. The ambiguous processes of the beginning tissue restructuring, which consist in the appearance of zones of resorption and stratification of bone tissue around the moved tooth, contribute to the same, the ultimate endurance of which also varies. There is a need for repeated measurements at the stages of tooth movement. To do this, a lamellar mandibular retainer with preheated low-melting material 3 and a thermally insulated body 2 is placed in the oral cavity, the elastic element is installed in the position corresponding to its initial bearing on the moved tooth without changing its geometric shape. The hardening of the fusible material provides good fixation of the elastic element in a new spatial position. The measurements are repeated.

This device, due to the presence of an elastic element having a curved section connected with it and a vertical flat section on which strain gages are glued, allows measuring the ultimate endurance of a moved FNA of a tooth not under artificial conditions, but under conditions of functioning of the maxillofacial system: chewing swallowing speech. Moreover

ultimate endurance is characterized not by artificially selected horizontal and vertical axes of the tooth, but by the axis of a really working load - the functional axis, which is important when developing

individual patient treatment plan. For the first time, the opportunity has appeared to tentatively evaluate the efforts of the interaction on the moved teeth of a whole class of orthodontic appliances according to the prince of action

- functional guides, - where efforts are generated during the function of chewing, swallowing, speech and are dosed by the patient himself. This allows us to characterize this class of orthodontic appliances, so

how they are arbitrarily assessed by the efforts to exert influence on the tooth are extremely contradictory: from the sparing, physiological in the first stages to the prohibitive, destructive effects in the treatment process.

Pinching the vertical flat section of the elastic element with strain gauges into a container with fusible material with the possibility of movement allows you to solve the above question, as well as

to determine the dynamics of changes in the impact forces and the ultimate endurance of a tooth moved under the action of FNA at the stages of treatment under conditions that are most reproducible. This is facilitated by taking measurements with a metered chewing and test colloquial test, observing the identity of the shape and parameters of the medical and diagnostic devices and the surface of its resting on the tooth.

The presence in the device of an elastic element that repeats the geometric shape of the medical apparatus allows an approximate assessment of the work of a number of NP structures with elastic

shock absorbing transmission of force to the tooth, in contrast to the construction of a rigid inclined plane.

Location of load cells on opposite surfaces of the vertical

section of the elastic element allows to measure the total elastic deformation of the vertical, bent and communicated sections, which increases the accuracy of the force measurements.

Claims (1)

The use of the proposed device provides a medical effect by reducing the treatment time and the adaptation period when using the measurement results in the prognosis and treatment plan to develop optimal designs of NP FNA. The social effect of reducing the number of visits and social rehabilitation of the patient is also contemplated. SUMMARY OF THE INVENTION A device for determining the force exerted on a tooth being moved during treatment with an orthodontic apparatus, comprising a body and an elastic element a strain gauge located on it, connected to the registrar, characterized in that, in order to increase the accuracy of determining the functional efforts on the tooth and its ultimate endurance along the axis of functional loading, it additionally contains a removable plate mandibular retainer, the body is fixedly connected to the clamp and has a cavity filled with fusible material, in which an elastic element is cantilevered, having a curved section and a section communicated with it, configured to interact with palatine tooth surface.