Novel gel thin-film capacitive sensor and method for measuring occlusal force of full-mouth teeth

Abstract

A new type of gel film capacitive sensor and method for measuring the occlusal force of full mouth teeth. The upper and lower surfaces of the insulating medium are each pasted with a layer of ion gel as an electrolyte. These two substances are soft and transparent and pasted at several points Ion gel forms several capacitors that can change with the bite force, connect these capacitors in parallel, and paste a layer of insulating medium on the upper and lower surfaces to avoid the influence of external parasitic capacitance, and connect to the acquisition card through the bus to obtain the full bite force The total capacitance value under the action can measure the occlusal force of the whole mouth teeth; the capacitive sensor resultant force measurement device can obtain the full-mouth occlusal force by using a simple parallel circuit, while the piezoresistive force measurement device can only measure one way and cannot complete The measurement of the cumulative sum adopts a new type of gel material to ensure that the occlusal force of the whole mouth can be obtained under the condition of restoring the occlusal teeth as much as possible, and the material has good repeatability measurement accuracy, low cost, easy processing, disposable use, clean and hygienic .

Description

technical field [0001] The invention belongs to a capacitive pressure sensor, in particular to a novel gel thin film capacitive sensor and a method for measuring the occlusal force of full mouth teeth. Background technique [0002] Excessive occlusal force can lead to pathological remodeling of the periodontal tissue until the teeth become loose and fall off. Measuring the occlusal force of the full mouth teeth is of great significance for the diagnosis and treatment of dental diseases. Traditional occlusal test materials, such as occlusal paper, can measure the "occlusal result imprint", but cannot express the relative magnitude of the full-mouth occlusal force, and the accuracy is not good. Therefore, it is necessary to use a device that accurately measures the occlusal force of the full mouth to provide the occlusal force when the full mouth is in contact. Long-term excessive force and fall off lead to planting failure. However, the traditional tooth bite force measurem...

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Problems solved by technology

However, the traditional tooth bite force measurement sensor has the following problems: First, if the resultant force measurement device adopts a capacitive sensor, the bite force of the whole mouth is related to the total capacitance value of all parallel capacitive sensor units, and the total capacitance value in the parallel circuit is equal to The simple addition of the capacitance values ​​of each branch, but the current similar piezoresistive force measuring device cannot be implemented with this simple parallel circuit, it must be measured in a single way, and the measurement of the cumulative sum cannot be completed; secondly, the previous mechanical, resistance Strain gauge or piezoelectric effect-based sensor probes are hard sensor probes. When the subject bites the hard probe, there will be a reflexive inhibition mechanism for self-protection. At this time, the measured bite force value is usually lower than normal. The occlusal force value is lower, and the traditional material is opaque, and the change of the teeth cannot be observed during the measurement; finally, the outer surface of the hard sensor probe usually needs to be covered with a layer of elastic material or rubber sleeve for protection, but the thickness of the sensor has no effect on the occlusion. The measurement of the force value has a great influence, and it is difficult to ensure complete disinfection of this kind of rubber sleeve in clinical measurement

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