CN106404231A - Personalized lower jawbone biomechanics model stress measurement system - Google Patents
Personalized lower jawbone biomechanics model stress measurement system Download PDFInfo
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- CN106404231A CN106404231A CN201610898684.0A CN201610898684A CN106404231A CN 106404231 A CN106404231 A CN 106404231A CN 201610898684 A CN201610898684 A CN 201610898684A CN 106404231 A CN106404231 A CN 106404231A
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
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- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
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Abstract
The present invention provides a personalized lower jawbone biomechanics model stress measurement system. The system comprises a measurement pedestal, a muscle strength equivalent structure, the fixing device of the muscle strength equivalent structure, an articular disc fixing device, a loading platform and a strain gage. The fixing device of the muscle strength equivalent structure, the articular disc fixing device and the loading platform are installed on the measurement pedestal, the personalized lower jawbone biomechanics model includes a lower jawbone and two temporal-mandibular joint discs, the lower jawbone is provided with the spring hanger of the upper jaw muscle group, the strain gage is pasted at the measurement region of the lower jawbone, the two temporal-mandibular joint discs are fixed in the articular disc fixing device, two condyles on the lower jawbone model are arranged in the articular disc, the teeth for bearing the bite force in the lower jawbone model is contacted with the motion end of the loading platform, the lower end of the muscle strength equivalent structure is connected with the spring hanger, and the upper end of the muscle strength equivalent structure is connected with the fixing device of the muscle strength equivalent structure. The personalized lower jawbone biomechanics model stress measurement system can express the patient's real condition and has good measurement accuracy.
Description
Technical field
The present invention relates to mandibular bone biomechanical model e measurement technology, especially a kind of mandibular bone biomechanical model should
Force measuring system.
Background technology
Mandibular bone is that in human body Maxillary region skeleton, volume and area are all maximum, is also the facial skeleton of uniquely energy activity,
It is connected with cranium jawbone by remporomandibular joint and lower jaw muscle.The biomechanical model of mandibular bone is that fracture of mandible operation is repaiied
Multiple, mandibular defect rebuilds the oral cavities such as reparation, Dental implant surgery, Tooth orthodontic correction or dental disorder precise therapeutic regimes are worked out
And the mechanical foundation of Maxillary region simulated crash, wound analysis etc..The difficult point that mandibular bone biomechanical model builds is two sides
Face：One is the heterogeneous material characteristic that mandibular bone has, and two is the applying of mandibular bone muscular force effect.
At present, the mandibular bone biomechanical model based on simplification and hypothesis obtains in mandibular bone finite element analyses
Application.In these FEM (finite element) model, typically mandibular bone is simplified to a kind of homogeneous material, or comprises cortical bone and spongy bone two
Plant material properties.Under treatment during jawbone action of muscles, by the gmatjpdumamicss of certain position by certain distribution formula, with lower jaw
Bone entirety dynamic balance is foundation, converses the equivalent action power that masticatory muscless, temporalis and musculus pterygoideus etc. rise jaw muscle group；Or will be different
Muscle is simplified to the spring of a certain rigidity.Because these finite element analysis models have typically carried out larger simplification, lack real again
Test means of testing, its degree of accuracy lacks checking.
Existing lower jaw bone biomechanical detection model is generally basede on really in vitro human lower jawbone, its mechanical analyses number
According to as conventional data, only as reference in other cases.Individuation measurement but be cannot be carried out for specific patient, obtain
To corresponding Mechanical Data.Although, also applied according to the personalized model of mandible data creating, due to mould
The restriction of type manufacturing technology, typically can only obtain the mandible model with single uniform material properties.And for muscular force
Effect, typically passes through the more complicated handling process such as bonding rubber band or spring, limits its application.On the other hand, existing
Mandible model lacks effective mechanical simulation and measuring system it is impossible to obtain the Mechanical Datas such as required stress distribution.
Content of the invention
For the general number overcoming the biomechanical model based on human body isolated mandible to build and obtain in measuring
Carry out the poor deficiency of mechanical analyses, test accuracy according to the case that is not used to specifically to perform the operation, the present invention provides one kind more can table
Reach real conditions, the stress measurement system of test accuracy preferable Individual Mandibular bone biomechanical model of patient.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of stress measurement system of Individual Mandibular bone biomechanical model, described stress measurement system includes measuring bottom
Seat, muscular strength equivalent structure, the fixing device of muscular strength equivalent structure, joint tray fixing device, weighted platform and foil gauge, described flesh
The fixing device of power equivalent structure, joint tray fixing device and weighted platform are installed on measurement base, Individual Mandibular bone
Biomechanical model includes mandibular bone and two disk of temporomandibular joint, and on described mandibular bone, arrangement rises jaw muscle group (outside temporalis, the wing
Flesh, masseter and medial pterygoid) spring carrier arm, described foil gauge is attached to the test zone of mandibular bone, described two remporomandibular joint
Disk is fixed in the tray fixing device of described joint, and two condyloid process on mandible model load in meniscuss, mandible model
In bear the tooth of gmatjpdumamicss and the action end in contact of described weighted platform, the lower end of described muscular strength equivalent structure and described spring
Hook connects, and the upper end of described muscular strength equivalent structure is connected with the fixing device of muscular strength equivalent structure.
Further, the fixing device of described muscular strength equivalent structure includes rigid cord, pressing plate and slide bar, described rigid cord
Lower end be connected with the upper end of described muscular strength equivalent structure, the upper end of described rigid cord be wound on pressing plate and pass through described pressing plate
Gap and slide bar between, described pressing plate is retractably installed on slide bar to adjust the size in gap.
Preferably, described slide bar has through hole, the two ends of described pressing plate carry screw rod, and described screw rod passes through described logical
Hole, screw rod can be from lead to the hole site any on slide bar, and to obtain required muscular strength direction, the lower end of described screw rod is installed and adjusted
Nut.Other positioning modes can also be selected.
Column is installed on described measurement base, described column side carries chute, and the two ends nut of described slide bar is fixed
In described chute.
Described weighted platform includes loading column and tongue shape platform, and described tongue shape stage+module is on loading column, described
Load column to be arranged on described measurement base.
Described measuring system also includes the signal processor of the stress information for analyzing foil gauge reception, described foil gauge
Described signal processor is connected by transmission cable.
The technology design of the present invention is：If can design and produce based on the mandibular bone data of patient itself
There is cortical bone and spongy bone is layered and considers the Individual Mandibular bone biology of liter jaw muscle group equivalent mechanism and mechanical meaurement scheme
Mechanical model, and measure on the special mechanical measuring platform building, then can obtain this Individual Mandibular bone Biological Strength
Learn accurate mechanical meaurement data and the stress distribution situation of model, thus providing theoretical value for complicated operation plan design
According to.
According to Individual Mandibular bone biomechanical model of the present invention, model is the personalized duplication of mandible
Analogue model, the Mechanical Data obtaining on its basis can be used for instructing the accurate therapeutic scheme working out this patient；This model
Material including cortical bone and loose bone two attribute；Complete denture including patient and spring carrier arm, described complete denture is divided
For bearing the tooth of gmatjpdumamicss and other tooth, the tooth wherein bearing gmatjpdumamicss has complete root of the tooth and periodontal membrane, other
Tooth and mandibular bone are an entirety；The installation site of described spring carrier arm is that mandibular bone rises jaw muscle group (masseter, temporalis, the wing
Interior flesh, lateral pterygoid) center of joint face on mandibular bone, in order to connecting spring.
Beneficial effects of the present invention are mainly manifested in：Construct normal mandibular bone, fracture repair mandibular bone, under defect repair
The biomechanical model of multiple situation such as jawbone, and measure its Mechanical Data.With existing general mandibular bone biomechanical model
Compare, Individual Mandibular bone biomechanical model more can express the real conditions of patient, then pass through stress measurement system, can obtain
To the stress distribution situation of mandibular bone diverse location, thus performing the operation for lower jaw bone-specific drug provide theoretical foundation.
Brief description
Fig. 1 is Individual Mandibular bone biomechanical model simplification figure, and wherein, 1 is disk of temporomandibular joint, and 2 is mandibular bone, 21
It is the spring carrier arm of temporalis, lateral pterygoid, masseter and medial pterygoid respectively with 29,22 and 28,24 and 27,25 and 26,23 is periodontal membrane.
Fig. 2 is the front view of stress measurement system, and wherein, 3 is muscular strength equivalent structure, wherein 31 and 38,32 and 37,33 and
36th, 34 and 35 is the equivalent spring of temporalis, lateral pterygoid, masseter and medial pterygoid respectively, and 4 is joint tray fixing device.
Fig. 3 is the side view of stress measurement system, and wherein, 5 is measurement base, and 51 is slide bar, and 52 is pressing plate, and 53 is vertical
Post, 54 is foil gauge, and 6 is weighted platform, and 7 is transmission cable, and 8 is signal processor, and 9 is computer terminal.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
With reference to Fig. 1～Fig. 3, a kind of stress measurement system of Individual Mandibular bone biomechanical model, described stress measurement
System includes measuring base 5, muscular strength equivalent structure 3, the fixing device of muscular strength equivalent structure, joint tray fixing device 4, loads and put down
Platform 6 and foil gauge 54, the fixing device of described muscular strength equivalent spring, joint tray fixing device 4 and weighted platform 6 are installed in survey
On amount base 5, Individual Mandibular bone biomechanical model includes mandibular bone 2 and two disk of temporomandibular joint 1, described mandibular bone 2
Upper arrangement temporalis, the spring carrier arm of lateral pterygoid, masseter and medial pterygoid, described foil gauge 54 is attached to the test zone of mandibular bone 2, institute
State two disk of temporomandibular joint 1 to be fixed in described joint tray fixing device 4, two condyloid process on mandible model load closes
In section disk, in mandible model, bear the tooth of gmatjpdumamicss and the action end in contact of described weighted platform 6, the equivalent knot of described muscular strength
The lower end of structure 3 is connected with described spring carrier arm, and the upper end of described muscular strength equivalent structure is connected with the fixing device of muscle equivalent structure
Connect.
Further, the fixing device of described muscle equivalent structure includes rigid cord, pressing plate 52 and slide bar 51, described rigidity
The lower end of rope is connected with the upper end of described muscular strength equivalent structure, and the upper end of described rigid cord is wound on pressing plate 52 and passes through institute
State the gap between pressing plate 52 and slide bar 51, described pressing plate 52 is retractably installed on slide bar 51 to adjust the size in gap.
Preferably, described slide bar 51 has through hole, the two ends of described pressing plate 52 carry screw rod, and described screw rod passes through described
Through hole, screw rod can be from lead to the hole site any on slide bar, and to obtain required muscular strength direction, the lower end of described screw rod is installed and adjusted
Section nut.Other positioning modes can also be selected.
On described measurement base 5, column 53 is installed, described column 53 side carries chute, the two ends spiral shell of described slide bar 51
Mother is fixed in described chute.
Described weighted platform 6 includes loading column and tongue shape platform, and described tongue shape stage+module is on loading column, described
Load column to be arranged on described measurement base.
Described measuring system also includes the signal processor 8 of the stress information for analyzing foil gauge reception, described strain
Piece 54 connects described signal processor 8 by transmission cable 7.
In the present embodiment, measurement base 5 installs 4 root posts 53,4 sides of every root post all have chute, for cunning
Bar 51 is mobile；Described muscular strength equivalent structure 3 includes 8 springs, and 8 springs correspond to 8 rigid cord, and described spring is mould
Intend the liter jaw muscle group (masseter, temporalis, medial pterygoid, lateral pterygoid) under interlocking pattern, the rigidity of spring and length are according to checking with EMG method
Selecting, spring one end is connected with epimandibular spring carrier arm, and the other end is connected with rigid cord for instrument detection or empirical value,
The other end of rigid cord is wrapped on pressing plate, is compressed by pressing plate 52, then is fixed by nut；The consolidating of described muscular strength equivalent structure
Determine device by 52,16 nuts of 51,8 pressing plates of 4 slide bars composition, described slide bar can in chute up and down or left and right is slided
Dynamic, for the direction of adjusting force；Described joint tray fixing device 4 is made up of 2 columns carrying rectangle draw-in groove, will during use
Disk of temporomandibular joint 1 slips into and clamping from side；Described weighted platform 6 is made up of a root post and tongue shape platform, for mould
Intend fixing upper jaw bone；Described signal processor 8 is used for analyzing the stress information that foil gauge is received, and described computer is to use
To record and to check the stressing conditions of mandibular bone each position foil gauge, and the material behavior according to printer model and ess-strain close
System, calculates the stress value of relevant position.
The stress measurement system of the present embodiment, work process comprises the following steps：
1) composition of measuring table includes：Muscular strength equivalent structure 3, the fixing device (51 and 52) of muscular strength equivalent structure, close
Section tray fixing device 4, measures base 5, weighted platform 6, foil gauge 54, signal processor 8 and computer 9 etc.；
2) two disk of temporomandibular joint 1 are fixed in the joint tray fixing device 4 of measuring table, then by mandible model
On two condyloid process load in meniscuss, the tooth bearing gmatjpdumamicss in mandible model is contacted with tongue shape loading bench, general
Muscle equivalent spring (31 and 38,32 and 37,33 and 36,34 and 35) one end and lower jaw bone surface hook (21 and 29,22 and 28,
24 and 27,25 and 26) connect, the spring other end is connected with rigid cord, and the other end of rigid cord is wound on pressing plate 52, will
Pressing plate presses to slide bar 51, tightens nut.
3) position of regulation spring (31 and 38,32 and 37,33 and 36,34 and 35) and slide bar 51 and size, simulation is different
The gmatjpdumamicss of position；
4) being attached to foil gauge 54 needs the mandibular bone region of measurement；
5) connect foil gauge and signal processor, connect signal processor 8 and computer terminal 9 with transmission cable 7；
6) read each position strain value on computers, and the material behavior according to printer model and stress-strain relation,
Calculate the stress value of relevant position.
Designing and producing of the personalized biological mechanical model of the present embodiment, comprises the following steps：
(1) obtain the mandibular bone CT data needing to measure patient：CT scan can use the normal spiral CT or special CT of dentistry, is
No more than 1 millimeter of guarantee precision, slice distance during Spiral CT scan and thickness；
(2) using MIMICS software, CT data is processed, according to the gray value on CT image, distinguish mandibular bone
Cortical bone layer and cancellous bone layer, reconstruct the mandibular bone threedimensional model with cortical bone and spongy bone bi-material attribute；
(3) if mandible has fracture, it is made to reset by adjusting the position of fracture portions in software；If
Mandible has defect or needs Partial Resection, need to be repaired by autologous bone transplanting and artificial implant, then design
Go out to transplant the shape of body portion, construct the mandible model after reparation；
(4) reconstruct the threedimensional model 1 of disk of temporomandibular joint；
(5) need are loaded with the tooth of gmatjpdumamicss, root of the tooth and the model of periodontal mould 23 can be reconstructed, for simplifying operation, its
Remaining tooth and mandibular bone are an entirety；
(6) muscle (temporalis, lateral pterygoid, masseter and medial pterygoid) of mandibular bone is reduced to one-dimensional spring (31 Hes in Fig. 2
38th, 32 and 37,33 and 36,34 and 35), design one in the center of each piece of muscle and epimandibular joint face and contain paster
Hook (21 and 29,22 and 28,24 and 27,25 and 26), as spring connecting point, during use, paster is pasted on lower jaw bone photo
Answer position；
(7) measured zone analysis and measurement scheme are worked out：According to specific mandibular bone mechanical analyses purpose, determine interested
Mandibular bone measured zone, such as angle of mandible, design the quantity of foil gauge in this region, and correspondingly design on mandibular bone should
Become the installation site of piece；
(8) spring rate determines：Measured under certain interlocking pattern with checking with EMG method instrument (electromyographic, EMG)
Muscular force, and calculate the equivalent stiffness of spring；
(9) mandibular bone carries out 3D printing, cortex with selective laser sintering SLS (3D system company HiQ+HS series)
Bone and spongy bone are respectively adopted different laser powers, material be nylon material, can obtain intensity close with true skeleton and
The simulation skeleton of hardness；Load tooth to make of same method, periodontal membrane silicone filler is formed between tooth and tooth nest；
(10) it is directed to the mandibular bone of fracture, fixed with titanium plate after detached bone piece is resetted；Lower jaw for defect repair
Bone, transplant is partially disposed in the position of design, is fixed with titanium plate；
(11) utilize CT data, reconstruct the remporomandibular joint dish structure including cartilage and hard layer bi-material attribute,
With Connex 350 extrusion molding 3D printer, print soft or hard bi-material simultaneously, be there is soft layer and hard layer simultaneously
Disk of temporomandibular joint 1.
Content described in this specification embodiment is only enumerating of the way of realization to inventive concept, the protection of the present invention
Scope is not construed as being only limitted to the concrete form that embodiment is stated, protection scope of the present invention also includes art technology
Personnel according to present inventive concept it is conceivable that equivalent technologies mean.
Claims (6)
1. a kind of stress measurement system of Individual Mandibular bone biomechanical model it is characterised in that：Described stress measurement system
Including measurement base, muscular strength equivalent structure, the fixing device of muscular strength equivalent structure, joint tray fixing device, weighted platform and should
Become piece, the fixing device of described muscle equivalent spring, joint tray fixing device and weighted platform are installed on measurement base, individual
Property mandibular bone biomechanical model include mandibular bone and two disk of temporomandibular joint, on described mandibular bone, arrangement rises jaw muscle group
Spring carrier arm, described foil gauge is attached to the measured zone of mandibular bone, and described two disk of temporomandibular joint are fixed to described meniscuss
In fixing device, two condyloid process on mandible model load in meniscuss, bear the tooth of gmatjpdumamicss in mandible model
With the action end in contact of described weighted platform, the lower end of described muscular strength equivalent structure is connected with described spring carrier arm, described muscular strength
The upper end of equivalent structure is connected with the fixing device of muscle equivalent structure.
2. Individual Mandibular bone biomechanical model as claimed in claim 1 stress measurement system it is characterised in that：Described
The fixing device of muscular strength equivalent structure includes rigid cord, pressing plate and slide bar, the lower end of described rigid cord and described muscular strength etc.
The upper end of effect structure connects, and the upper end of described rigid cord is wound on pressing plate and through the gap described pressing plate and slide bar,
Described pressing plate is retractably installed on slide bar to adjust the size in gap.
3. Individual Mandibular bone biomechanical model as claimed in claim 2 stress measurement system it is characterised in that：Described
Through hole is had on slide bar, the two ends of described pressing plate carry screw rod, described screw rod passes through described through hole, the lower end of described screw rod is installed
Adjusting nut.
4. Individual Mandibular bone biomechanical model as claimed in claim 2 or claim 3 stress measurement system it is characterised in that：
Column is installed on described measurement base, described column side carries chute, and the two ends nut of described slide bar is fixed on described cunning
In groove.
5. the stress measurement system of the Individual Mandibular bone biomechanical model as described in one of claims 1 to 3, its feature exists
In：Described weighted platform includes loading column and tongue shape platform, and described tongue shape stage+module on loading column, stand by described loading
Post is arranged on described measurement base.
6. the stress measurement system of the Individual Mandibular bone biomechanical model as described in one of claims 1 to 3, its feature exists
In：Described measuring system also includes the signal processor of the stress information for analyzing foil gauge reception, and described foil gauge passes through
Transmission cable connects described signal processor.
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| CN201610898684.0A CN106404231A (en) | 2016-10-14 | 2016-10-14 | Personalized lower jawbone biomechanics model stress measurement system |
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Cited By (6)
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| CN108466197A (en) * | 2018-03-28 | 2018-08-31 | 湖南大学 | A kind of fixture can adjust spatial position for fixing various sizes of mandible model |
| CN108555795A (en) * | 2018-03-28 | 2018-09-21 | 湖南大学 | One kind can stepless changing spatial position and posture fixture for fixing mandible model |
| CN112050849A (en) * | 2019-06-05 | 2020-12-08 | 四川大学 | Novel 3D prints temporomandibular joint biomechanics experimental system |
| CN112885219A (en) * | 2021-01-14 | 2021-06-01 | 南京医科大学附属口腔医院 | Temporomandibular joint disc anterior displacement model for teaching |
| CN113647930A (en) * | 2021-07-20 | 2021-11-16 | 首都医科大学 | Force application device for human lower jaw triangle area in nuclear magnetic environment |
| CN115294844A (en) * | 2022-07-18 | 2022-11-04 | 东南大学 | Bionic occlusal frame |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108466197A (en) * | 2018-03-28 | 2018-08-31 | 湖南大学 | A kind of fixture can adjust spatial position for fixing various sizes of mandible model |
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| CN112050849A (en) * | 2019-06-05 | 2020-12-08 | 四川大学 | Novel 3D prints temporomandibular joint biomechanics experimental system |
| CN112885219A (en) * | 2021-01-14 | 2021-06-01 | 南京医科大学附属口腔医院 | Temporomandibular joint disc anterior displacement model for teaching |
| CN112885219B (en) * | 2021-01-14 | 2022-12-27 | 南京医科大学附属口腔医院 | Temporomandibular joint disc forward displacement model for teaching |
| CN113647930A (en) * | 2021-07-20 | 2021-11-16 | 首都医科大学 | Force application device for human lower jaw triangle area in nuclear magnetic environment |
| CN115294844A (en) * | 2022-07-18 | 2022-11-04 | 东南大学 | Bionic occlusal frame |
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Application publication date: 20170215 |