Gel film array capacitive sensor and method for measuring the dynamic meshing of the whole dentition

Abstract

A gel film array capacitive sensor and method for measuring the dynamic occlusion of the whole dentition. The upper and lower surfaces of the insulating medium are each pasted with a layer of ion gel as an electrode. The upper ion gel is distributed in rows, and the lower ion gel is distributed in columns. Projected to the insulating medium in the middle, the overlapping parts of the three form a capacitor array, and a layer of insulating medium is pasted on the upper and lower surfaces to avoid the influence of external parasitic capacitance. The row and column scanning method is used to obtain capacitance signals at different sensing points, and a full mouth bite is obtained. The sequence of contact of each pair of teeth, the magnitude of the occlusal force during contact, and the change over time; the capacitive sensor has high precision and high sensitivity, and the high resolution means that it can measure small changes in force. The use of new gel materials ensures Accurately measure the dynamic meshing process under the condition of restoring tooth occlusion as realistically as possible, and the material has good repeatability measurement accuracy, and high transparency allows the sensor to observe changes in teeth while transmitting electrical signals.

Description

Technical field [0001] The invention belongs to an array type capacitive pressure sensor, in particular to a gel film array type capacitive sensor and a method for measuring dynamic meshing of full dentition. Background technique [0002] In the dynamic meshing process of the full dentition, which pair of teeth are in contact first, the magnitude of the interaction force during contact, and the change of force over time during the occlusal process are important basis for the dentist to diagnose the occlusion of the patient’s teeth. Traditional bite test materials, such as bite paper, can measure "bite result imprints", but they cannot accurately measure and record the sequence of bite contact or the relative size of bite force, and the accuracy is poor. Therefore, it is necessary to design a measuring device that records the force distribution and time of the occlusal contact of the full dentition and the corresponding relationship between the two, and provide the most accurate d...

AI Technical Summary

Problems solved by technology

However, the traditional tooth bite force measurement sensor has the following problems: First, the capacitive sensor has high precision and high sensitivity, high resolution ensures the sensitivity to force, can sense small changes in force, and has good temperature stability. The accuracy of the resistive sensor used is greatly affected by the external environment such as temperature, and the resolution is not high, so it is difficult to record the change trend of the occlusal force in the process of full dentition engagement with high precision; secondly, the previous mechanical, resistance strain gauge or Based on the piezoelectric effect and other hard sensor probes, the subject will have a self-protective reflexive inhibition mechanism when biting the hard probe. At this time, the measured bite force is often lower than the normal value of the bite force. Moreover, traditional materials are opaque, and changes in the teeth cannot be observed during the measurement process; finally, the outer surface of the hard sensor probe is usually covered with a rubber sleeve for protection, but the thickness of the sensor has a greater impact on the measurement of the bite force, and this type of rubber sleeve is in It is difficult to ensure complete disinfection in clinical practice

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