KR20100094160A - The toothe infrared imaging system and a toothe image analysis method - Google Patents

Abstract

PURPOSE: A tooth infrared imaging apparatus and an analytical method using the apparatus are provided to obtain objective tooth diagnose information using an automatic detection algorithm and developing a light source and an optical filter. CONSTITUTION: A tooth infrared imaging apparatus comprises a white light source(21) for irradiation white light to tooth of a patient(1) and a fluorescent light source(22) for irradiating a fluorescent lighting. The white light source comprises: a light source unit(2) for irradiating light to pass through a linear polarizer(23); a camera(3) for detecting an image of tooth; a first filter(4) which is mounted between the patient and the camera and selectively locates one among polarizing filters(41,42,43); and a second filter(5) which is mounted between the first filter and the camera.

Description

A tooth imaging apparatus and an analysis method by the above device {The toothe infrared imaging system and a toothe image analysis method}

The present invention relates to a dental imaging apparatus and an analysis method by the apparatus, which will be described in more detail so that an effective diagnosis and treatment can be made by selectively photographing an image with a desired information in order to grasp the state of the tooth. The present invention relates to a dental imaging apparatus and an analysis method developed by the apparatus.

Dentistry (odontology) diagnosis can be largely divided into aesthetic purposes for the production of natural tooth-like dental restorations in connection with prosthodontic and for monitoring the diagnosis and treatment effects of diseases such as gingivitis, periodontitis and tooth decay.

Various non-invasive methods have been used to quantitatively and objectively diagnose and analyze teeth, including colorimetric methods, intra-oral cameras, colorimeters, spectrometers and digital image processing by the operator. Optical methods using digital photography based are typical.

However, the most commonly performed shade-guided colorimetric method by the operator is affected by the diagnostic environment and the operator's fatigue and clinical experience, so that reproducible diagnosis is difficult and the analysis using color difference and spectrometer shows relatively accurate results. There is a limitation in applying the point measurement method directly to the manufacture of dental restorations or to dental plaque and caries diagnosis.

In addition, the scoring method using oral dyes, which is generally performed for diagnosis of dental plaque and tooth decay, is simple, but it is dependent on the subjective judgment of the clinician and thus lacks objectivity. Although it is easily accessible, it often requires a high numerical aperture compared to a low resolution, so it is limited in clinical use due to image distortion.

Digital photography-based diagnostic methods have higher diagnostic objectivity compared to colorimetric methods and show high correlation with the diagnostic results of conventional touch / point measuring devices (color difference meter, spectrometer). This will aid in rapid diagnosis through analysis.

Currently developed systems provide information on most of the parameters required for the fabrication of dental restorations, but lack of information on dental translucency for the precision work of dental restorations. With no user interface-based software developed, there is a limit to automated analysis for dental restorations.

In addition, the diagnosis of diseases such as tartar and tooth decay that causes gingivitis and periodontitis is lacking to monitor the treatment effect, and the optical measurement technology including the technology is used to detect existing independent light for developing integrated diagnosis and analysis method for dental diagnosis. There is a need for the development of a dental imaging apparatus for incorporating the method into a single device and the need for the method.

In order to solve the above problems, the present invention provides a dental imaging apparatus for the early diagnosis of tartar and tooth decay, which can be used as an indirect measure of parameter detection and oral hygiene for precision work of dental restorations Develop analytical methods.

In addition, it is to develop a dental imaging device to obtain a desired image with a simple operation.

In order to achieve the above object, the present invention comprises a white light source for irradiating white light to a subject's teeth and a fluorescent light source for irradiating fluorescent light, the white light source is a light source made to pass through a linear polarizer;

A camera for detecting an image of a tooth;

A primary filter mounted between the test subject and the camera to selectively position one of a plurality of polarizing filters formed to intersect the filtering direction of the linear polarizer at various angles from 0 ° to 90 °;

It is mounted between the camera and the primary filter, characterized in that composed of a secondary filter to selectively position one of a plurality of broadband filters to pass only light of a predetermined wavelength.

In addition, the primary filter may include a first rotating plate having a shape of a disc rotating based on a center, several first mounting holes symmetrically formed at predetermined intervals from a center of the first rotating plate, and the first mounting hole. Comprising a polarizing filter mounted to the linear polarizer and comprises a polarizing filter of 0 °, 45 °, 90 ° respectively;

The secondary filter may include a second rotating plate having a shape of a disc rotating based on a center, several second mounting holes symmetrically formed at regular intervals from a center of the second rotating plate, and mounted in the second mounting hole. It is composed of a broadband filter, characterized in that it comprises a broadband filter to pass light of 550nm, 640nm wavelength.

In addition, the light source unit is formed between the subject and the primary filter, in the form of a ring formed in the center through the through-hole connecting between the lens of the camera and the subject's teeth in the direction of the surrounding subject A white light source and a fluorescent light source are mounted in different concentric circles;

Barrier ribs are formed to prevent mutual interference inside and outside the white light source and the fluorescent light source;

The front of the white light source is characterized in that the linear polarizer is mounted.

In addition, in the method of analyzing the state of the teeth by photographing the subject's teeth;

The general color image is composed of an image photographed by a camera through a polarizing filter of 45 ° with the linear polarizer and the teeth irradiated through the linear polarizer white light source;

An image in which the surface curvature of the tooth is emphasized is composed of an image photographed by a camera through a polarizing filter forming a 0 ° angle with the linear polarizer through which the white light source is irradiated through the linear polarizer;

The image extracting only the image formed by the light reflected from the enamel and dentin of the tooth provides accurate color information. The image of the tooth irradiated by the white light source through the linear polarizer passes through the polarizing filter 90 ° with the linear polarizer. An image taken with;

The image showing only the distribution of calculus distributed on the teeth among the tartar stained by Erythrosin FDC Red selectively transmits the white light source irradiated through the linear polarizer to the 90 ° polarization filter and the light of 550nm wavelength. An image taken by a camera through a broadband filter;

The image showing only the distribution of calculus in the gum among the tartar stained with Erythrosin FDC Red selectively transmits the white light source to the tooth irradiated through the linear polarizer and the polarizer filter 90 ° with the linear polarizer and 640 nm wavelength light. An image taken by a camera through a broadband filter;

The image that can identify where the lesion is among the teeth is characterized in that the image is taken with a camera that is irradiated with a fluorescent light source (UV-A).

As described above, the present invention provides objective tooth diagnosis information by the development of a light source and a light filter applicable to other fields and the use of an automatic detection algorithm. There is.

In addition, it is an economical integrated diagnostic device and analysis method that can replace the current expensive spectrometer and color difference meter, not only contribute to the creation and formation of high efficiency imaging equipment market, but also have the effect of import replacement of dental diagnostic equipment, which is 100% dependent on import.

Accordingly, the configuration of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce.

1 is a diagram illustrating a state of use according to an embodiment of the present invention, FIG. 2 is a conceptual view illustrating photographing by a white light source according to an embodiment of the present invention, and FIG. 3 is a fluorescence light source according to an embodiment of the present invention. As a conceptual diagram showing the photographing by the present invention, a white light source 21 for irradiating white light to the teeth of the examinee 1 and a fluorescent light source 22 for irradiating fluorescent light is provided, wherein the white light source 21 is a linear polarizer 23. A light source unit 2 configured to pass through and irradiate;

A camera 3 for detecting an image of a tooth;

Among the plurality of polarization filters 41, 42, 43 mounted between the subject 1 and the camera 3, the polarizing filters 41, 42, 43 intersected at various angles from 0 ° to 90 ° with the filtering direction of the linear polarizer 23. A primary filter 4 for selectively positioning one;

A secondary filter 5 mounted between the camera 3 and the primary filter 4 to selectively position one of a plurality of broadband filters 51 and 52 allowing only light of a predetermined wavelength to pass therethrough. A dental imaging apparatus is shown.

In a more detailed embodiment, the light source unit 2 has a white light source 21 having a wavelength of about 400 nm to 700 nm for color, transparency, and calculus of teeth, and a fluorescent light source 22 for detecting caries (UV; A; 320-380 nm). And a linear polarizer 23 is positioned in an arbitrary direction to linearly polarize the irradiation light in front of the white light source 21 to selectively irradiate the light source to the tooth.

In this case, it is preferable to form the subject fixing part 11 to reliably photograph the teeth of the subject 1, a mouthpiece for oral fixation for a reproducible image acquisition, and a jaw for preventing the movement of the subject. And a blackout curtain for forehead fixation and darkroom effects.

In addition, in the present invention, the primary filter 4 may be symmetrically formed at a predetermined interval from the center of the first rotating plate 44 and the center of the first rotating plate 44. And a plurality of first mounting holes 45 and polarization filters 41, 42, and 43 mounted on the first mounting holes 45, respectively, with the linear polarizer 23 being 0 °, 45 °, Polarizing filters 41, 42, 43 constituting 90 °;

The secondary filter 5 may include a second rotating plate 53 having a shape of a disc rotating based on a center thereof, and several second mounting holes symmetrically formed at predetermined intervals from the center of the second rotating plate 53. And a broadband filter (51, 52) configured to pass through light having a wavelength of 550nm, 640nm, and the broadband filter (51, 52) mounted in the second mounting hole (54). Is further presented.

In the above embodiment, only the rotating of the first and second rotating plates 44 and 53 enables the selection of a desired polarization filter and a wideband filter, thereby making the operation convenient.

In this case, the function of each type of the polarization filter 41, 42, 43 and the broadband filter 51, 52 will be described in detail in the following description.

In another exemplary embodiment of the present invention, the light source unit 2 is formed between the examinee 1 and the primary filter 4, and the lens 31 and the examinee 1 of the camera 3 are formed at the center thereof. The through-hole 24 is formed to form a through-hole connecting between the teeth of the plurality of white light source 21 and the fluorescent light source 22 in the direction of the surrounding subject (1) is formed to form different concentric circles ;

Barrier ribs 25 are formed to prevent mutual interference inside and outside the white light source 21 and the fluorescent light source 22;

An embodiment in which the linear polarizer 23 is mounted in front of the white light source 21 is further provided.

Figure 4 is a photograph showing a tooth image taken in accordance with an embodiment of the present invention, in the method of analyzing the state of the teeth by photographing the teeth of the subject (1);

An image in which the surface curvature of the tooth is emphasized is photographed by the camera 3 through the polarization filter 41 forming a 0 ° angle with the linear polarizer 23 by the white light source a through the linear polarizer 23. Consisting of a video;

The general color image (b) is an image in which a white light source 21 is photographed by the camera 3 via a polarizing filter 42 which forms a tooth 45 ° with the linear polarizer 23 through the linear polarizer 23. Consisting of;

The image (c) extracts only the image formed by the light reflected from the enamel and dentin of the tooth so as to provide accurate color information. The image (c) of the white light source 21 is irradiated through the linear polarizer 23. 23 is made of an image taken by the camera (3) through a polarizing filter 43 to form a 90 °;

The image (d) selectively showing only the distribution of calculus distributed on the teeth among the tartar stained by Erythrosin FDC Red, shows the teeth irradiated by the white light source 21 through the linear polarizer 23 and the linear polarizer 23 and 90. It consists of the image photographed with the camera 3 via the polarization filter 43 which makes a ° and the broadband filter 51 which transmits only light of 550 nm wavelength;

Image (e), which selectively shows the distribution of calculus in the gums among the tartars stained by Erythrosin FDC Red, shows that the white light source 21 is irradiated through the linear polarizer 23 to the linear polarizer 23 and 90. It consists of the image photographed with the camera 3 via the polarization filter 43 and the broadband filter 52 which transmits light of 640 nm wavelength only;

The image (f) which can identify the place of the lesion among the teeth is a desired image by the tooth image analysis method, characterized in that the image of the teeth irradiated with a fluorescent light source (22; UV-A) is taken by the camera (3) It is to make it easier to determine the condition of the teeth.

According to the embodiment of the present invention, it is easy to grasp the state of health of the teeth by the image of the general state of the tooth and the image of the tooth surface and the image of the accurate color distribution of the tooth surface.

In addition, by using the broadband filters 51 and 52, the calculus distributed on the teeth or gums is emphasized to provide an easily understandable image, thereby facilitating removal and treatment of calculus.

In addition, the fluorescent light source 22 has a characteristic of producing auto-fluorescence of green wavelength in the case of normal teeth, but when the surface is damaged due to the lesion, the lesion is more easily used by using the characteristic of not emitting such auto-fluorescence. It is possible to easily determine the location and the size of the.

1 is a state diagram used in accordance with an embodiment of the present invention

2 is a conceptual diagram illustrating photographing by a white light source according to an embodiment of the present invention;

3 is a conceptual diagram showing the shooting by the fluorescent light source according to an embodiment of the present invention

4 is a photograph showing a tooth image taken according to an embodiment of the present invention

<Explanation of symbols for main parts of the drawings>

1: Subject

     11: subject fixing part

2: light source

     21: white light source 22: fluorescent light source

     23: linear polarizer 24: through hole

     25: bulkhead

3: camera

     31: Lens

4: primary filter

     41: polarization filter (0 °) 42: polarization filter (45 °)

     43: polarization filter (90 °) 44: first rotating plate

     45: first mounting hole

5: secondary filter

     51: wideband filter (550nm) 52: wideband filter (640nm)

     53: second rotating plate 54: second mounting hole

a: Image highlighting surface curvature of teeth

b: Normal color image

c: Image formed by light reflected from the enamel and dentin of teeth

d: Image showing only the distribution of calculus in teeth among the calculus stained with Erythrosin FDC Red.

e: Image showing only the distribution of calculus in gums among the calculus stained with Erythrosin FDC Red.

f: An image to identify where the lesion is in the tooth

Claims (4)

It consists of a white light source 21 for irradiating the white light to the teeth of the subject (1) and the fluorescent light source 22 for irradiating the fluorescent light, the white light source 21 is a light source unit which is irradiated through the linear polarizer 23 ( 2) and; A camera 3 for detecting an image of a tooth; Among the plurality of polarization filters 41, 42, 43 mounted between the subject 1 and the camera 3, the polarizing filters 41, 42, 43 intersected at various angles from 0 ° to 90 ° with the filtering direction of the linear polarizer 23. A primary filter 4 for selectively positioning one; A secondary filter 5 mounted between the camera 3 and the primary filter 4 to selectively position one of a plurality of broadband filters 51 and 52 allowing only light of a predetermined wavelength to pass therethrough. Tooth imaging device characterized in that consisting of. The method of claim 1, wherein the primary filter 4 is formed to be symmetrically formed at a predetermined interval from the center of the first rotating plate 44 and the first rotating plate 44 in the form of a disk that rotates with respect to the center. And a plurality of first mounting holes 45 and polarization filters 41, 42, and 43 mounted on the first mounting holes 45, respectively, and the linear polarizer 23 and 0 °, 45 °, and 90 °, respectively. Polarizing filters 41, 42, and 43 constituting the same; The secondary filter 5 may include a second rotating plate 53 having a shape of a disc rotating based on a center thereof, and several second mounting holes symmetrically formed at predetermined intervals from the center of the second rotating plate 53. And a broadband filter (51, 52) configured to pass through the light having a wavelength of 550nm, 640nm, and the broadband filter (51, 52) mounted in the second mounting hole (54). Tooth Imaging Device. The method according to claim 1 or 2, wherein the light source unit (2) is formed between the subject (1) and the primary filter (4), in the center of the lens 31 and the subject (1) of the camera (3) The through hole 24 is formed to connect through the teeth of the () is formed in the form of a plurality of white light source 21 and fluorescent light source 22 in the direction of the surrounding subject (1) is formed in different concentric circles Become; Barrier ribs 25 are formed to prevent mutual interference inside and outside the white light source 21 and the fluorescent light source 22; Dental imaging apparatus, characterized in that the linear polarizer 23 is mounted in front of the white light source (21). In the method of analyzing the state of the teeth by photographing the teeth of the subject (1); An image in which the surface curvature of the tooth is emphasized is photographed by the camera 3 through the polarization filter 41 forming 0 ° with the linear polarizer 23 through which the white light source a is irradiated through the linear polarizer 23. Consisting of images; A general color image (b) is an image in which a white light source 21 is photographed by a camera 3 via a polarizing filter 42 forming a 45 ° angle with the linear polarizer 23 through the linear polarizer 23. Consisting of; The image (c) extracts only the image formed by the light reflected from the enamel and dentin of the tooth so as to provide accurate color information. The image (c) of the white light source 21 is irradiated through the linear polarizer 23. 23 is made of an image taken by the camera (3) through a polarizing filter 43 to form a 90 °; The image (d) selectively showing only the distribution of calculus distributed on the teeth among the tartar stained by Erythrosin FDC Red, shows the teeth irradiated by the white light source 21 through the linear polarizer 23 and the linear polarizer 23 and 90. It consists of the image photographed with the camera 3 via the polarization filter 43 which makes a ° and the broadband filter 51 which transmits only light of 550 nm wavelength; Image (e), which selectively shows the distribution of calculus in the gums among the tartars stained by Erythrosin FDC Red, shows that the white light source 21 is irradiated through the linear polarizer 23 to the linear polarizer 23 and 90. It consists of the image photographed with the camera 3 via the polarization filter 43 and the broadband filter 52 which transmits light of 640 nm wavelength only; Image (f) to identify the location of the lesion in the teeth tooth image analysis method characterized in that consisting of an image taken by the camera (3) the teeth irradiated with a fluorescent light source (22; UV-A).

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