CN105496430B - Measure the new type gel thin film capacitor type sensor and method of denture bite force - Google Patents
Measure the new type gel thin film capacitor type sensor and method of denture bite force Download PDFInfo
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- CN105496430B CN105496430B CN201510847893.8A CN201510847893A CN105496430B CN 105496430 B CN105496430 B CN 105496430B CN 201510847893 A CN201510847893 A CN 201510847893A CN 105496430 B CN105496430 B CN 105496430B
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61B5/22—Ergometry; Measuring muscular strength or the force of a muscular blow
- A61B5/224—Measuring muscular strength
- A61B5/228—Measuring muscular strength of masticatory organs, e.g. detecting dental force
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Abstract
A kind of new type gel thin film capacitor type sensor and method measuring denture bite force, the upper and lower surface of dielectric respectively pastes one layer of ionic gel as electrolyte, both substances are soft, transparent, if pasting ionic gel at the place of doing, form several capacitors that can change with bite force, by the parallel connection of these capacitors, and one layer of dielectric is respectively pasted in lower surface on it, avoid the influence of external parasitic capacitances, capture card is connected to by bus and obtains the total capacitance value under full mouth bite force effect, to measure denture bite force size；The capacitance sensor sensor of biting force device can obtain full mouth bite force using ball bearing made in parallel, and pressure resistance type sensor of biting force device can only single channel measurement, it is unable to complete the measurement of cumulative sum, it ensure that using new type gel material and obtain denture bite force in really reduction dental articulation as far as possible, and the material has good duplicate measurements precision, and it is low in cost, it is easy to process, can be disposable, clean hygiene.
Description
Technical field
The invention belongs to a kind of capacitance pressure transducer,s, and in particular to a kind of to measure the novel solidifying of denture bite force
Glue thin film capacitor type sensor and method.
Background technique
Excessive bite force can lead to periodontium and enter pathologic reconstruction, up to tooth mobility, falls off, measures dental pattern
Tooth bite force size, has great importance to the diagnosing and treating of dental disorder.Tradition stings jaw test material, such as stings jaw paper,
" the occlusion result marking " can be measured, can not but indicate the relative size of full mouth bite force, poor accuracy.Therefore it need to pass through one kind
The device for accurately measuring full mouth bite force, bite force size when the contact of full mouth is provided, such as after the completion of planting treatment, by stinging
Resultant force analyzes the stress size informations of available implant top dentures, and planting body is avoided to fall off and cause because long-term stress is excessive
Plantation failure.But there are the following problems for traditional dental articulation force measuring sensors: firstly, firstly, if sensor of biting force fills
It sets using capacitance type sensor, full mouth bite force size is related to the total capacitance value of all shunt capacitance sensor units, simultaneously
Join the simple addition that total capacitance value in circuit is equal to each branch capacitance, however current similar pressure resistance type sensor of biting force device without
Method is implemented with this simple parallel circuit, it is necessary to which single channel measurement is unable to complete the measurement of cumulative sum；Secondly, previous machinery
Formula, strain ga(u)ge formula belong to hard sensor probe based on piezoelectric effect etc., and subject can go out when stinging hard probe
The reflexive suppression mechanism of existing self-protection, measured occlusion force value is usually relatively low in bite force under normal circumstances at this time
Value, and traditional material is opaque, and the variation of tooth can not be observed in measurement process；Finally, previous hard sensor is visited
Head outside need to usually cover one layer of elastic material or rubber sleeve shields, but measurement of the thickness of sensor to occlusion force value
It is affected, and such rubber sleeve is difficult to ensure thorough disinfection in clinical measurement.
Summary of the invention
To solve the above-mentioned problems of the prior art, the purpose of the present invention is to provide a kind of occlusions of measurement denture
The new type gel thin film capacitor type sensor and method of power, present invention employs novel soft, thin, transparent gel rubber material systems
Make can real-time measurement denture bite force capacitance type sensor, therefore the present invention for measure denture bite force when
The self-protection reflectivity suppression mechanism of subject will not be evoked, while sensor thickness is minimum, can reach micron dimension, selected
If doing, several variable capacitances are formed, full mouth bite force is obtained by total capacitance of all capacitors of measurement after in parallel
Size.
In order to achieve the above objectives, the technical scheme adopted by the invention is that:
A kind of new type gel thin film capacitor type sensor measuring denture bite force, including dielectric 3, insulation are situated between
If the upper layer place of doing of matter 3 is bonded several cube gels, ionic gel 2 on several cube gel-formings, insulation
Lower layer's integral adhesive of medium 3 has in lower ionic gel 4, the dielectric 3 and lower ionic gel 4 and upper ionic gel 2
Several cube gels are respectively formed several capacitors, and the upper surface of upper ionic gel 2 integrally pastes one layer of upper insulation and is situated between
Matter 1, one layer of lower dielectric 5 is pasted in the lower surface of lower ionic gel 4, several in upper dielectric 1 and upper ionic gel 2
Several conducting wires are drawn by metal electrode between a upper ionic gel and are connected respectively to upper bus 6, lower dielectric 5 and from
The metal electrode that sub- 4 junction of gel is pasted draws lower bus 7.
The material that the upper ionic gel 2 and lower ionic gel 4 use is hydrogel ion conductor, with a thickness of micron amount
Grade；The thickness of the dielectric 3, upper dielectric 1 and lower dielectric 5 is also micron dimension.
The upper ionic gel 2 and lower ionic gel 4 and dielectric 3, upper dielectric 1 and lower dielectric 5 are equal
Soft and transparent.
It is powered in measurement by D.C. regulated power supply, metal electrode and ionic gel form electron-ion hybrid current circuit
Electric signal is transmitted, almost all of voltage drop all occurs on dielectric, at metal electrode-electrolyte interface electric double layer
Voltage drop is much smaller than 1V, so that electrochemical reaction will not occur for ionic gel, and ionic gel is after repeated loading, capacitor with
The relationship of pressure only has the drift of very little, can almost ignore, therefore has good duplicate measurements precision.
The measurement method of the new type gel thin film capacitor type sensor of the described measurement denture bite force, when compression,
If that a part of 3 length and width direction of dielectric for corresponding to a certain cube gel of upper ionic gel 2 is drawn as λ
Times, constancy of volume is thought after deformation, then thickness direction is compressed toTimes, capacitor C is original state capacitor C after deformation0λ4
Times, capacitance is fairly obvious with the variation of deformation, is easy to measure, and upper bus 6 and lower bus 7 are connected to D.C. regulated power supply
It on the capture card of power supply and capacitor value signal will be obtained passes to capture card, total capacitance value signal is obtained by capture card, convert
Obtain denture occlusion force value.
Compared to the prior art, the present invention has the advantage that
If 1, the present invention is picked up to use and be done, the parallel connection of several capacitors is formed, total capacitance is the simple of several capacitances
It is added, by measuring total capacitance, is just readily available full mouth bite force；Presence and cusp contact due to interval of tooth
To the sequencing of sensor, the bite force for acting on a sensor is one section one section and is spaced apart, compared to one whole
The design of bulky capacitor, it is in parallel using discrete capacitor, the influence of additional stiffness can be reduced to a certain extent, guarantee measurement
Accuracy.
2, the present invention makes capacitance sensor using soft, transparent ionic gel and dielectric, on the one hand eliminates
Influence of the self-protective mechanism that subject occurs when stinging hard object to bite force, can more really restore under normal circumstances
The dental articulation situation of people, so that accurately measurement denture is engaged force value, the transparency possessed by another aspect sensor makes
It obtains while transmission telecommunications number, it can be observed that the variation of tooth.
3, the hydrogel ion conductor thickness of the present invention as electrolyte can be worked into very thin, reach micron
Magnitude, and there is good biocompatibility, meet the demand of " hidden property physically " that bite force measurement needs, therefore
Tooth will not be constrained when measuring bite force, so as to avoid sensor thickness to the shadow of dental articulation power accuracy of measurement
It rings, maximum possible reduces true bite force situation, guarantees the accuracy of measurement.
4, the present invention is powered by D.C. regulated power supply in the measurements, and metal electrode and ion conductor hydrogel form electronics-
Ar ion mixing current loop transmits electric signal, and almost all of voltage drop all occurs on dielectric, so that ionic gel is not
Electrochemical reaction can occur, and ionic gel, after repeated loading, the relationship of capacitor and pressure only has the drift of very little, almost
It can ignore, therefore there is good duplicate measurements precision.The used lower cost for material of the present invention, it is easy to process, so that this
Sensor can make a one-time use only, clean hygiene.
Detailed description of the invention
Fig. 1 is the full mouth bite force capacitor sensor structure schematic diagram of new type gel measured thin film of the present invention.
Fig. 2 is the capacitance sensor equivalent circuit diagram that the present invention considers that gel film is constituted when electric double layer.
Fig. 3 is the whole equivalent circuit of the full mouth bite force capacitance sensor of new type gel measured thin film after ignoring electric double layer
Figure.
Fig. 4 is that new type gel thin film capacitor sensors of the present invention measure denture occlusion force measuring system principle signal
Figure.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description.
As shown in Figure 1, the real-time measurement denture that the present invention is a kind of novel soft, thin, transparent gel production is stung
The thin film capacitor type sensor of resultant force, including dielectric 3, the upper layer of dielectric 3 corresponds to uniformly glues at several characteristic points
Several cube gels are connected to, ionic gel 2 on this several cube gel-forming, the lower layer of dielectric 3 is integrally equal
Even several cubes being bonded in lower ionic gel 4, the dielectric 3 and lower ionic gel 4 and upper ionic gel 2 are solidifying
Glue is respectively formed several capacitors, and the upper surface for the influence for avoiding external parasitic capacitances, upper ionic gel 2 is pasted on one layer
One layer of lower dielectric 5 is pasted in the lower surface of dielectric 1, lower ionic gel 4, in upper dielectric 1 and upper ionic gel 2
Several on several conducting wires drawn by metal electrode between ionic gel be connected respectively to upper bus 6, be situated between in lower insulation
The metal electrode that matter 5 and 4 junction of ionic gel are pasted draws lower bus 7.Upper surface and lower dielectric in dielectric 1
5 lower surface acts on bite force, when considering one of capacitor, if dielectric 3 with a thickness of d, with upper ionic gel 2,
Lower 4 contact area of ionic gel is A, then capacitance calculation formula is under original stateWherein ε0For vacuum dielectric
Constant, εrFor medium relative dielectric constant, under the effect of dental articulation power, it is assumed that dielectric is perfect elastic body, if corresponding
Initial length is drawn as in the length and width of that a part of dielectric 3 of a certain cube gel of upper ionic gel 2
λ times of degree, it is believed that constancy of volume, thickness can be compressed to initial length after deformationTimes, then the electricity after stress deformation
Capacitance isIt can be seen that capacitance variations will be fairly obvious after compression, convenient for measurement, bite force
Other several capacitors under effect have capacitance variations.
As shown in Fig. 2, discussing by taking a new type gel thin film capacitor as an example since metal electrode and electrolyte gel connect
Touch influence of the electric double layer of interface generation to measurement capacitance, in D.C. regulated power supply power supply, metal electrode-electrolyte circle
The electric double layer in face shows as capacitance properties, in parallel with dielectric capacitor, then by two metal electrodes measure capacitor with
Dielectric capacitor CDWith electric double layer capacitance CEDLThere is such relationship:Electricity in electrode and ion conductor
Lotus distribution distance is nanometer scale, but the charge of dielectric upper and lower surface is along thickness distribution that (dielectric thickness is micro-
Rice magnitude), usually, CEDL/CD~105, therefore the capacitor measured is mainly the capacitor of dielectric, i.e. C~CD, electric double layer
The influence of capacitor can be ignored.And voltage drop occurs mainly on dielectric, and interface electric double layer voltage is much smaller than 1V, because
This does not have the generation of electrochemical reaction, and guarantee allows the capacitance type sensor to reuse for a long time, and repeatedly circulation adds
There was only the drift of very little after load, there is good duplicate measurements precision.
As shown in figure 3, not considering electric double layer capacitance after ignoring electric double layer, then the total capacitance value measured is several
The parallel connection of dielectric capacitor, i.e. CD=CD1+CD2+...+CDn, upper bus 6 and lower bus 7 are connected on capture card and can obtain
Total capacitance value after several dielectric capacitors are in parallel.
As shown in figure 4, the operation principle of the present invention is that: ion on several in dielectric 1 and upper ionic gel 2
Several conducting wires are drawn by metal electrode between gel and are connected respectively to upper bus 6, are connected in dielectric 5 and ionic gel 4
It connects the metal electrode that place is pasted and draws lower bus 7.Upper bus 6 and lower bus 7 are connected on capture card, full mouth bite force is obtained
Capacitance signal under effect, carrying out digital operation acquisition denture bite force size P=kC by microprocessor, (k is experiment
Determining constant, range are 1~5pF/N), computer is transferred to by data communication connector.
Claims (5)
1. a kind of gel film capacitance type sensor for measuring denture bite force, it is characterised in that: including dielectric
(3), dielectric (3) if the upper layer place of doing be bonded several cube gels, on several cube gel-formings from
Sub- gel (2), lower layer's integral adhesive of dielectric (3) have lower ionic gel (4), and the dielectric (3) and lower ion are solidifying
Several cube gels in glue (4) and upper ionic gel (2) are respectively formed several capacitors, upper ionic gel (2)
Upper surface is integrally pasted one layer upper dielectric (1), and one layer of lower dielectric (5) is pasted in the lower surface of lower ionic gel (4),
Upper dielectric (1) and form upper ionic gel (2) if several cube gels between respectively by metal electrode extraction
A dry conducting wire is connected to bus (6), draws in the metal electrode that lower dielectric (5) and lower ionic gel (4) junction are pasted
Bus (7) are descended out.
2. the gel film capacitance type sensor of measurement denture bite force according to claim 1, it is characterised in that:
The material that the upper ionic gel (2) and lower ionic gel (4) use is hydrogel ion conductor, with a thickness of micron dimension；
The thickness of the dielectric (3), upper dielectric (1) and lower dielectric (5) is also micron dimension.
3. the gel film capacitance type sensor of measurement denture bite force according to claim 1, it is characterised in that:
The upper ionic gel (2) and lower ionic gel (4) and dielectric (3), upper dielectric (1) and lower dielectric (5)
Equal soft and transparent.
4. the gel film capacitance type sensor of measurement denture bite force according to claim 1, it is characterised in that:
It is powered in measurement by D.C. regulated power supply, the metal electrode of lower bus (7) contact and lower ionic gel (4) form electron-ion
Hybrid current circuit transmission electric signal, be connected to the metal electrodes of several conductive contacts of bus (6) respectively with upper ion
Several cube gel-forming electron-ion hybrid current circuit transmission electric signals in gel (2), almost all of voltage
Drop all occurs on dielectric (3), at the electric double layer of the lower ionic gel of metal electrode-(4) interface of lower bus (7) contact
Voltage drop is much smaller than 1V, and the metal electrode-for being connected to several conductive contacts of bus (6) goes up the several of ionic gel (2)
Voltage drop is much smaller than 1V at the electric double layer of a cube gel interface, so that lower ionic gel (4) and upper ionic gel (2)
In several cube gels electrochemical reaction, and upper ionic gel (2), dielectric (3) and lower ion will not occur
Gel (4) formed capacitance structure in vertical direction repeatedly by uniform pressure after, capacitor and the corresponding relationship for being engaged force value
The only drift of very little can almost be ignored, therefore have good duplicate measurements precision.
5. the measurement method of the gel film capacitance type sensor of measurement denture bite force described in claim 1, special
Sign is: when compression, if corresponding to that a part of dielectric (3) length of a certain cube gel of upper ionic gel (2)
It is drawn as l times with width direction, constancy of volume is thought after deformation, then thickness direction is compressed toTimes, capacitor C after deformation
For original state capacitor C0L4Times, capacitance is fairly obvious with the variation of deformation, is easy to measure, upper bus (6) and lower bus
(7) it is connected on the capture card of D.C. regulated power supply power supply and capacitor value signal will be obtained and pass to capture card, by adopting
Truck obtains total capacitance value signal C, denture occlusion force value is calculated according to formula P=kC, wherein k is that experiment is determining
Constant, range are 1~5N/pF.
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| CN201510847893.8A CN105496430B (en) | 2015-11-27 | 2015-11-27 | Measure the new type gel thin film capacitor type sensor and method of denture bite force |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106768508B (en) * | 2016-12-02 | 2020-05-15 | 西安交通大学 | Gel capacitance type sensor and method for measuring plantar pressure and dynamic change |
| EP3756617B1 (en) * | 2019-06-27 | 2024-05-22 | DENTSPLY SIRONA Inc. | Method for recording at least one anatomical feature of a patient |
| CN112472033B (en) * | 2020-12-11 | 2024-04-05 | 西安建筑科技大学 | Multi-layer ionic skin finger joint movement angle measurement system and method |
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| CN1882825A (en) * | 2003-09-18 | 2006-12-20 | 奥卡卢斯坎股份公司 | Force transducer |
| CN102507052A (en) * | 2011-10-21 | 2012-06-20 | 江苏畅微电子科技有限公司 | Dot matrix type pressure distribution sensor based on carbon nano tube and preparation method thereof |
| CN105046084A (en) * | 2015-07-28 | 2015-11-11 | 芜湖科创生产力促进中心有限责任公司 | Tooth comprehensive measurement instrument capable of realizing data fusion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2008264024A (en) * | 2007-04-16 | 2008-11-06 | Etcc:Kk | Occlusion characteristic analyzing apparatus and occlusion characteristic analyzing method |
| KR101221415B1 (en) * | 2010-12-21 | 2013-01-11 | 한국표준과학연구원 | Tactile sensor for position and forse sensing of tooth, apparatus and system having the same, manufacturing method, obtaining method and recording medium thereof |
| US9622699B2 (en) * | 2014-04-24 | 2017-04-18 | Bruce Willard Hultgren | System for measuring teeth movement and contact pressure |
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| CN1882825A (en) * | 2003-09-18 | 2006-12-20 | 奥卡卢斯坎股份公司 | Force transducer |
| CN102507052A (en) * | 2011-10-21 | 2012-06-20 | 江苏畅微电子科技有限公司 | Dot matrix type pressure distribution sensor based on carbon nano tube and preparation method thereof |
| CN105046084A (en) * | 2015-07-28 | 2015-11-11 | 芜湖科创生产力促进中心有限责任公司 | Tooth comprehensive measurement instrument capable of realizing data fusion |
Non-Patent Citations (1)
| Title |
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| 水凝胶聚合物电解质超级电容器研究进展;许开卿等;《材料导报》;20110831;第25卷(第8期);27-28 * |
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