CN203226915U - Device for detecting demineralization on surfaces of teeth - Google Patents
Device for detecting demineralization on surfaces of teeth Download PDFInfo
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- CN203226915U CN203226915U CN 201320206672 CN201320206672U CN203226915U CN 203226915 U CN203226915 U CN 203226915U CN 201320206672 CN201320206672 CN 201320206672 CN 201320206672 U CN201320206672 U CN 201320206672U CN 203226915 U CN203226915 U CN 203226915U
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- linear polarizer
- light source
- demineralization
- illuminator
- teeth
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Abstract
The utility model discloses a device for detecting demineralization on surfaces of teeth. The device comprises a light source, a lighting system and the like, wherein the light source provides a visible light, and a lighting system and a first linear polarizing film are sequentially installed on the projecting light direction of the light source. The directions of optical axes of the light source, the lighting system and the first linear polarizing film and the normal on the surfaces of the teeth to be detected form an acute angle. A second linear polarizing film, an imaging system and a surface array photoelectric detector are sequentially installed in the normal direction on the surfaces of the teeth, wherein the imaging system ensures that the surfaces of the teeth and the surface array photoelectric detector receiving surface conjugate to perform imaging, the second linear polarizing film is placed between the teeth and the imaging system, and a rotary controller is connected with the second linear polarizing film for controlling rotation of the second linear polarizing film. The surface array photoelectric detector transmits the obtained images to a main processor. The detection device disclosed by the utility model detects the demineralization state on the surfaces of the teeth by polarizing imaging, so that the detection device has the advantages of accuracy, no contact, visualization and the like.
Description
Technical field
This utility model belongs to the stomatology technical field of imaging, particularly a kind of device that utilizes polarization imaging to detect dental surface demineralization situation.
Background technology
The enamel that covers dental surface mainly is made of inorganic matter, be in demineralization under the normal condition and again in the dynamic equilibrium in ore deposit, but, when dental tissue is under the sour environment for a long time, the speed of demineralization is greater than ore deposit speed again, and dynamic equilibrium is destroyed, and mineral is lost, cause the oral cavity bacterium intrusion, cause dental caries.The enamel of pathological changes loses original translucent sheen, presents the Chalk speckle.Therefore, the demineralization on dental tissue surface detection is the key of caries prevention.Traditional dental health state-detection adopts the method for inspection, depends on clinical oral cavity doctor's personal experience, under the doctor can't the affirmation situation, adopts the method for X-ray film, but well-known, ray method has radiation effects to human body, should not repeatedly use for a long time.
At the detection of dental health situation, mainly consider from the angle of dental plaque at present.Dental plaque is a kind of biomembrane that is made of various bacteria, is attached to dental surface, the acidic materials corrosion dental surface mineral that its metabolism produces.Therefore, be that the technology that the detection target has developed comprises laser dental caries detector DIAGNOdent Pen with the dental plaque, be used for point measurement, and represent testing result with the form of numerical value; Dental plaque detector VistaCam Intraoral Camera is used for surface imaging, represents testing result with the form of pseudo color image.Above-mentioned two kinds of detection methods all are to utilize the fluorescent effect of external substances such as oral cavity bacterium to diagnose, demineralization situation that can't the objective description dental tissue.
Summary of the invention
This utility model provides a kind of dental surface demineralization checkout gear that utilizes polarization imaging, it utilizes line polarized light incident tooth, the surface demineralization will cause the incident polarization polarization state of light to change degree and normal structure produces difference, obtain be parallel to each other image with vertical two states of back scattering polarization state of light and incident polarized light, and the degree of polarization that calculates each pixel obtains the degree of polarization image in order to characterize the demineralization situation of dental surface.
To focus on mutually and form diameter be glaze rod structure about 4 μ m to the inorganic matter hydroxyapatite crystal in the enamel, radially distribute to the dental surface direction from enamel essence interface, and in the dental surface near normal.Enamel is a kind of anisotropic medium as can be seen on the organizational structure, and under line polarized light incident, repeatedly after the scattering, its polarization state changes through organization internal, and the degree of change is relevant with the order of medium.After organizing demineralization, the order structure of enamel fiber is destroyed, and the change degree of line polarized light incident rear polarizer attitude reduces.Therefore, can utilize under the line polarized light incident, the change degree of polarization state is carried out imaging to the demineralization situation on dental tissue surface and is detected.The architectural feature that can accurately reflect tissue is not subjected to that dental surface dirt and illuminating bundle are inhomogeneity to be influenced.
This utility model is by the following technical solutions: dental surface demineralization checkout gear, comprise light source (1), illuminator (2), first linear polarizer (3), second linear polarizer (5), imaging system (6), Rotation Controllers, face battle array photodetector (7), primary processor, light source (1) provides visible light, illuminator (2) is installed on its throw light direction successively, first linear polarizer (3), light source (1), illuminator (2), the optical axis direction at first linear polarizer (3) place and tooth to be measured (4) normal to a surface (being the vertical line direction) are acute angle (namely greater than 0, angle less than 90 degree); Normal orientation on tooth (4) surface is installed second linear polarizer (5) successively, imaging system (6), face battle array photodetector (7), wherein, imaging system (6) guarantees tooth (4) surface and face battle array photodetector (7) receiving plane conjugate imaging, second linear polarizer (5) is placed between tooth (4) and the imaging system (6), Rotation Controllers links to each other with second linear polarizer (5), be used for the rotation of control second linear polarizer (5), when the polarization direction of second linear polarizer (5) and first linear polarizer (3) is parallel to each other, obtain the sub-picture of this moment by face battle array photodetector (7), and transfer in the primary processor and store; When vertical mutually in the polarization direction of second linear polarizer (5) and first linear polarizer (3), obtain another sub-picture at this moment by face battle array photodetector (7), and transfer in the primary processor and store; Primary processor is by calculating the degree of polarization result of each pixel, and finally shows the degree of polarization image.
Preferably, light source (1) for provide wave band 300 ?between the 1300nm continuously or narrow-band light source.
Preferably, illuminator (2) is the homogenization illuminator.
Preferably, face battle array photodetector (7) is the electro-optical imaging sensors of two dimension, light can be converted into the element of electricity as CCD, CMOS etc.
Preferably, primary processor is computer, as personal computer.
Preferably, Rotation Controllers is electric rotating machine, and the object stage of electric rotating machine (8) is hollow structure, and described second linear polarizer (5) is positioned over the hollow part of electric rotating machine (8), and fixes with electric rotating machine (8).
This utility model checkout gear utilizes polarization imaging to detect dental surface demineralization state, and the influence that it is not subjected to dental surface attachment and illumination unevenness has accuracy, advantage such as contactless, visual.
Description of drawings
Fig. 1 is the structural representation of this utility model checkout gear.
Fig. 2 is the assembly structure sketch map of electric rotating machine (8) and second linear polarizer (5).
In the diagram: 1-light source, 2-illuminator, 3-first linear polarizer, 4-tooth, 5-second linear polarizer, 6-imaging system, 8-electric rotating machine, 7-face battle array photodetector, 9-personal computer.
The specific embodiment
Below in conjunction with accompanying drawing this utility model embodiment is elaborated.
Fig. 1 has shown the embodiment of the tooth demineralization checkout gear that utilizes polarization imaging, comprising light source 1, illuminator 2, first linear polarizer 3, second linear polarizer 5, electric rotating machine 8, imaging system 6, face battle array photodetector 7, personal computer 9, light source 1 provide 300nm ? continuous spectrum in the 1300nm wavelength band or the light source of arrowband, its energy should guarantee through illuminator 2, first linear polarizer 3, tooth 4, second linear polarizer 5, can survey by quilt cover battle array photodetector 7 after the imaging system 6, thereby the reflected light quilt cover battle array photodetector 7 on tooth 4 surfaces is received.Face battle array photodetector 7 is the electro-optical imaging sensors of two dimension, light can be converted into the element of electricity as CCD, CMOS etc.Illuminator 2, first linear polarizer 3 are installed on the throw light direction of light source 1 successively, and illuminator 2 is the homogenization illuminator.And the normal direction of the optical axis direction at light source 1, illuminator 2, first linear polarizer, 3 places and dental surface forms greater than 0, less than the angles of 90 degree.Settle second linear polarizer 5 successively in the normal orientation on tooth 4 surfaces, imaging system 6, face battle array photodetector 7, wherein, imaging system 6 guarantees tooth 4 surfaces and face battle array photodetector 7 receiving plane conjugate imagings, second linear polarizer 5 is positioned between tooth 4 and the imaging system 6, second linear polarizer 5 links to each other with electric rotating machine 8, connected mode as shown in Figure 2, electric rotating machine 8 object stages are hollow structure, second linear polarizer 5 is positioned over the hollow part, and fix with electric rotating machine 8, electric rotating machine 8 is used for the rotation of control second linear polarizer 5, when the polarization direction of second linear polarizer 5 and first linear polarizer 3 is parallel to each other, obtain the sub-picture of this moment by face battle array photodetector 7, and transfer to storage in the personal computer 9.When vertical mutually in the polarization direction of second linear polarizer 5 and first linear polarizer 3, obtain another sub-picture of this moment by face battle array photodetector 7, and transfer in (linking with face battle array photodetector 7) personal computer 9 and store.In personal computer 9, obtain the degree of polarization result of each pixel, and finally show the degree of polarization image.Degree of polarization d=(the I of each pixel
Par-I
Per)/(I
Par+ I
Per), wherein, I
ParBe this gray values of pixel points that first linear polarizer 3 and second linear polarizer, 5 polarization directions obtain when being parallel to each other, I
PerThis gray values of pixel points of obtaining when to be first linear polarizer 3 vertical mutually with second linear polarizer, 5 polarization directions.
The related illuminator of this utility model, first linear polarizer, second linear polarizer, imaging system, face battle array photodetector, electric rotating machine, personal computer etc. all can adopt prior art.
Compare with traditional inspection, the contrast height of this utility model checkout gear can react the mineralising situation of dental surface effectively, can be used for the harmless diagnosis of the dental health situation of clinical oral.
Those of ordinary skill in the art will be appreciated that; above embodiment illustrates this utility model; and be not as to restriction of the present utility model, so long as in scope of the present utility model, all will drop in the protection domain of the present utility model variation, the distortion of above embodiment.
Claims (6)
1. dental surface demineralization checkout gear, it is characterized in that comprising light source (1), illuminator (2), first linear polarizer (3), second linear polarizer (5), imaging system (6), Rotation Controllers, face battle array photodetector (7), primary processor, light source (1) provides visible light, illuminator (2), first linear polarizer (3) are installed on its throw light direction successively, and optical axis direction and tooth to be measured (4) normal to a surface at light source (1), illuminator (2), first linear polarizer (3) place are acute angle; Normal orientation on tooth (4) surface is installed second linear polarizer (5), imaging system (6), face battle array photodetector (7) successively, wherein, imaging system (6) guarantees tooth (4) surface and face battle array photodetector (7) receiving plane conjugate imaging, second linear polarizer (5) is placed between tooth (4) and the imaging system (6), Rotation Controllers links to each other with second linear polarizer (5), is used for the rotation of control second linear polarizer (5); Face battle array photodetector (7) transfers to primary processor with the image that obtains.
2. dental surface demineralization checkout gear as claimed in claim 1 is characterized in that: described light source (1) for provide wave band 300 ?between the 1300nm continuously or narrow-band light source.
3. dental surface demineralization checkout gear as claimed in claim 1 is characterized in that: described illuminator (2) is the homogenization illuminator.
4. dental surface demineralization checkout gear as claimed in claim 1 is characterized in that: described battle array photodetector (7) is the electro-optical imaging sensors of two dimension.
5. dental surface demineralization checkout gear as claimed in claim 1, it is characterized in that: described primary processor is computer.
As claim 1 ?5 each described dental surface demineralization checkout gears, it is characterized in that: described Rotation Controllers is electric rotating machine, the object stage of described electric rotating machine (8) is hollow structure, described linear polarizer (5) is positioned over the hollow part of electric rotating machine (8), and fixes with electric rotating machine (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320206672 CN203226915U (en) | 2013-04-22 | 2013-04-22 | Device for detecting demineralization on surfaces of teeth |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320206672 CN203226915U (en) | 2013-04-22 | 2013-04-22 | Device for detecting demineralization on surfaces of teeth |
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| CN203226915U true CN203226915U (en) | 2013-10-09 |
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| CN 201320206672 Expired - Fee Related CN203226915U (en) | 2013-04-22 | 2013-04-22 | Device for detecting demineralization on surfaces of teeth |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103211660A (en) * | 2013-04-22 | 2013-07-24 | 杭州电子科技大学 | Tooth surface demineralization detection device utilizing polarization for imaging |
| TWI734213B (en) * | 2019-10-08 | 2021-07-21 | 勝智會科技顧問股份有限公司 | Achromatic image scanning, displaying and illuminating system |
-
2013
- 2013-04-22 CN CN 201320206672 patent/CN203226915U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103211660A (en) * | 2013-04-22 | 2013-07-24 | 杭州电子科技大学 | Tooth surface demineralization detection device utilizing polarization for imaging |
| TWI734213B (en) * | 2019-10-08 | 2021-07-21 | 勝智會科技顧問股份有限公司 | Achromatic image scanning, displaying and illuminating system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131009 Termination date: 20160422 |