JP2004089239A - Oral tissue observation device - Google Patents

Abstract

An object of the present invention is to provide an easy-to-use oral tissue observation device in which caries, unpolished portions, plaque, and the like can be easily visually recognized.
An illumination unit, a light detection unit having an imaging device for imaging an oral tissue, a control unit for controlling the illumination unit and the light detection unit, and a signal processing for processing a signal from the light detection unit. The illumination means 11 includes a plurality of light sources 23 to 25 having different wavelengths. The light sources are switched by the control means 13 and used. By illuminating the oral tissue with light having a wavelength, caries, unpolished portions, plaque and the like can be easily recognized as image information.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an intraoral observation device that can detect caries in an oral cavity, particularly an initial caries, early and safely, and that can easily visually recognize uncleaned teeth and tooth stains such as plaque. .
[0002]
[Prior art]
In a conventional intraoral observation apparatus, particularly a dental checkup, a probe 1 as shown in FIG. 10 is used to determine an initial invisible tooth decay, and a groove or a concave portion of the tooth 3 is operated by operating the grip portion 2. When the needle is inserted into the tooth 3, the diagnosis can be made on the basis of the tooth decay (C). Has been done. Also at home, dirt on teeth such as unpolished teeth and plaque after daily care using a toothbrush or the like was visually observed with a mirror.
[0003]
[Problems to be solved by the invention]
However, in the above-mentioned conventional screening method, it has been regarded as a problem that the initial caries may be scratched by the probe 1 too much to destroy the dentin and impair the natural healing power (remineralization of teeth). . For this reason, the Japanese School Dental Association has decided in May 2002 to stop using the "probe" to palpate teeth with a pointed needle and switch to visual inspection. In addition, although inspection is the mainstream overseas, there is a large individual difference between dentists in inspection, and there is a problem that unnecessary treatment such as tooth cutting is performed. Even at home, it is difficult to determine and recognize whether daily care using a toothbrush or the like is being performed effectively, and natural healing can be achieved by leaving unpolished or plaque stains on teeth. There has been a problem that the caries may progress from a possible initial caries to a caries at a stage requiring dental treatment.
[0004]
The present invention solves the above-mentioned conventional problems, and can detect caries, particularly early caries, early and safely without damaging the tissue, and can also leave unpolished teeth or plaque on teeth. Another object of the present invention is to provide an easy-to-use oral tissue observation device that can be easily viewed not only at the site of dental and school examinations but also at home.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in the oral tissue observation device of the present invention, the illuminating means for illuminating the oral tissue has a plurality of light sources having different wavelengths, and the light sources are switched and used by the control means. Oral tissue is illuminated with light of a wavelength, and the state of the oral cavity is acquired by image information.
[0006]
As a result, caries, especially initial caries, can be detected early and safely without damaging the tissue. In addition, dental stains such as unpolished teeth and plaque can be found not only at dental and school screening sites. It is an easy-to-use oral tissue observation device that can be easily viewed even at home.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The invention according to claim 1 is an illumination unit for illuminating oral tissue, a light detection unit having an imaging element for imaging oral tissue by irradiating the oral tissue with light from the illumination unit, and the illumination. Means and control means for controlling the light detection means, signal processing means for processing a signal from the light detection means, and signal output means for outputting a signal from the signal processing means, wherein the illumination means has a wavelength of It has a plurality of different light sources, and uses the light sources by switching by the control means, and by using an oral tissue observation device that illuminates oral tissues with light of different wavelengths, without damaging the tissues, caries, especially in the initial stage. Caries can be found early and safely, and tooth stains such as unpolished teeth and plaque can be easily visually recognized not only at the site of dental and school examinations but also at home. In particular, by irradiating the oral cavity with multiple light sources with different wavelengths such as ultraviolet light, blue light, green light and red light, it is easy to find initial caries and plaques that cannot be clearly observed with white light. It becomes.
[0008]
The invention according to claim 2 is an illumination unit for illuminating the oral tissue, a light detection unit having an imaging element for imaging the oral tissue by irradiating the oral tissue with light from the illumination unit, and the illumination. Control means for controlling the light detection means, signal processing means for processing a signal from the light detection means, and signal output means for outputting a signal from the signal processing means, wherein the illumination means is a white light source. And a plurality of filters having different wavelength components passing therethrough. The plurality of filters are switched and used by the control means, and the oral tissue observation device illuminates the oral tissue with light of different wavelengths. Light with different wavelengths, such as light, blue light, green light, and red light, can be irradiated, and initial caries and plaque, which cannot be clearly observed with white light, can be easily found. In addition, the configuration is also simple such that a filter is simply added to the white light source.
[0009]
According to a third aspect of the present invention, the signal processing means wirelessly outputs the processed signal to the signal output means, so that there is no trouble in handling the apparatus by using the oral tissue observation apparatus according to the first or second aspect. It can be used with good operability.
[0010]
According to a fourth aspect of the present invention, the light detecting means detects the fluorescence intensity emitted from a tooth or the like by using the oral tissue observation device according to any one of the first to third aspects having a light intensity detecting element. Therefore, information such as caries or tooth stains can be displayed on the image.
[0011]
According to a fifth aspect of the present invention, the signal processing means enlarges an image of the oral tissue and outputs the enlarged image to the signal output means according to the signal intensity from the light intensity detecting element. By doing so, the visibility can be improved by enlarging the image of the corresponding portion in accordance with the signal intensity from the light intensity detection element, that is, the degree of dental caries or tooth contamination.
[0012]
According to a sixth aspect of the present invention, the signal output means performs marking display on the oral tissue image according to the signal intensity from the light intensity detecting element, thereby detecting the light intensity. The visibility can be improved by displaying markings at the corresponding locations in accordance with the signal intensity from the element, that is, the degree of dental caries or tooth contamination.
[0013]
The invention according to claim 7, wherein the signal output means arbitrarily changes the contrast of the oral tissue image according to the signal intensity from the light intensity detection element. By using the observation device, the visibility can be improved by arbitrarily changing the contrast according to the signal intensity from the light intensity detection element, that is, the degree of dental caries or tooth contamination.
[0014]
The invention according to claim 8, wherein the control means changes the irradiation time from the light source according to the signal intensity from the light intensity detection element. By taking advantage of the fact that the fluorescence decay time changes according to the signal intensity from the light intensity detection element, that is, the degree of dental caries and tooth contamination, the irradiation time from the light source can be shortened for an extremely short time. Alternatively, the visibility can be improved by forming a pulse shape so that a fluorescent afterimage of a carious part or the like remains.
[0015]
According to a ninth aspect of the present invention, the signal processing means converts the signal from the light intensity detection element into an audio signal to obtain an oral tissue observation apparatus according to any one of the fourth to eighth aspects, thereby providing an optical system. By converting the signal from the intensity detection element into an audio signal, it is possible to easily find a caries or a stained part of a tooth without looking at an image.
[0016]
According to a tenth aspect of the present invention, the signal output means changes the frequency of the sound in accordance with the signal intensity detected by the light intensity detecting element to perform the notification, thereby providing an optical system for observing an oral cavity. By changing the frequency of the sound in accordance with the signal intensity detected by the intensity detection element and notifying, it is possible to easily find the degree of dental caries and dirt on the teeth without looking at the image.
[0017]
According to an eleventh aspect of the present invention, the signal output means issues an audio message in accordance with the signal intensity detected by the light intensity detecting element. By notifying the voice message in accordance with the detected signal intensity, the degree of dental caries and dirt on the teeth can be easily found without using the image or using it by ordinary people other than medical staff.
[0018]
According to a twelfth aspect of the present invention, the light detecting means includes an optical image magnifying element at a position between the oral tissue and the image sensor, and arbitrarily changes a distance between the optical image magnifying element and the oral tissue. According to the oral tissue observation device according to any one of claims 1 to 11, by changing the focal length of a lens or the like, an image of a portion to be observed can be displayed in a desired size.
[0019]
The invention according to claim 13 is that the handpiece portion containing at least the illumination means and the light detection means is composed of a handpiece tip and a handpiece base, and the handpiece tip is replaceable. According to the oral tissue observation device described in any one of 12, the handpiece portion can be divided into a handpiece tip portion and a handpiece base portion, so that the shape can be adjusted according to the shape of the teeth and the position in the oral cavity. It can be replaced with a handpiece tip that is easy to use, improving workability.
[0020]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
(Example 1)
FIG. 1 shows an oral tissue observation apparatus according to a first embodiment of the present invention. As shown in FIG. 1A, an illuminating unit 11 for illuminating an oral tissue, and a light detecting unit having an imaging device 21 for irradiating the oral tissue with light from the illuminating unit 11 to image the oral tissue. 12, a control unit 13 for controlling the illumination unit 11 and the light detection unit 12, a signal processing unit 14 for processing a signal from the light detection unit 12, and a signal output for outputting a signal from the signal processing unit 14. The illumination means 11 includes a plurality of light sources having different wavelengths. The light sources are switched by the control means 13 and used to illuminate oral tissues with light of different wavelengths. The illuminating unit 11, the light detecting unit 12, the control unit 13, and the signal processing unit 14 are provided in the handpiece unit 10 and can be freely operated by the user with the handpiece unit 10.
[0022]
The illuminating means 11 includes first to third light sources 23 to 25 such as LEDs fixed to a light source fixing part 22 and an optical fiber 20 for illumination. Lighting. Hereinafter, the oral tissue will be mainly described with respect to teeth, but is not limited to teeth. Information on the illuminated teeth is delivered from the observation port 18 to the imaging device 21 via the observation optical fiber 19 constituting the light detection means 12. The illumination means 11 is provided with an illumination optical fiber 20, and the light detection means 12 is provided with an observation optical fiber 19. However, this is not always necessary, and the light source fixing part 22 and the imaging element 21 are directly opposed to the teeth. Is also good. The information on the teeth detected by the image sensor 21 is converted into image information by the signal processing unit 14 and is displayed as an image by the signal output unit 15 via the cable 16.
[0023]
In addition, the light source fixing unit 22 rotates under the control of the control unit 13 and illuminates the light of the light source whose position matches the optical fiber for illumination 20, so that the first light source 23, the second light source 24, and the third light source The light source 24 can be switched. In the case of FIG. 1B, the first light source 23 has been selected. It is well known that irradiating a tooth with ultraviolet light or the like emits fluorescence having different spectra between a healthy part and a carious part. Therefore, by using white light as the first light source 23, ultraviolet light of 330 nm to 380 nm as the second light source 24, and green light of 510 nm to 560 nm as the third light source 24, the degree of dental caries is reduced with white light. Can be observed. However, since initial caries are difficult to detect with white light, using light of different wavelengths as the second and third light sources facilitates not only advanced caries but also early caries. . In the case of FIG. 1B, three types of light sources are used. However, by increasing the number of light sources having different wavelength ranges, it is possible to cope with caries that may be overlooked by a light source of a specific wavelength.
[0024]
(Example 2)
FIG. 2 shows an oral tissue observation apparatus according to a second embodiment of the present invention. In this embodiment, as shown in FIG. 2A, a filter fixing part 31 is provided so as to face the light source fixing part 22. The filter fixing section 31 has first to third filters 32 to 34 as shown in FIG.
[0025]
Here, the light source fixing part 22 is provided with a white light source 30, and the optical fiber for illumination 20 is provided at a position facing the white light source 22 to illuminate the teeth. The first to third filters 32 to 34 are switched by rotating the filter fixing unit 31 by the control unit 13. In the case of FIG. 2B, the first filter 32 has been selected. Therefore, if a filter that transmits white light as the first filter 32, an ultraviolet light of 330 nm to 380 nm as the second filter 33, and a green light of 510 nm to 560 nm as the third filter 34 is used, the same as in the first embodiment is used. The effect is obtained. Although three types of filters are shown, the present invention is not limited to this.
[0026]
According to this embodiment, since the light source can be realized by using only a white light source, it is easy to expand the function only by adding filters 32 to 34 to an oral observation camera or the like having a white light source already used. it can. In addition, the configuration is also simple such that a filter is simply added to the white light source.
[0027]
(Example 3)
Next, an oral tissue observation apparatus according to a third embodiment of the present invention will be described. In the present embodiment, the signal processing means 14 for converting into an image signal shown in FIG. 1A of the first embodiment is provided with a function of outputting infrared rays or radio waves in the 2.4 GHz band. The signal is output to the signal output means 15 by radio.
[0028]
Accordingly, the cable 16 in the first embodiment is not required, and the image of the tooth can be visually recognized by the signal output unit 15 wirelessly. For this reason, it is possible to use the handpiece unit 10 with good operability without bothering the handling of the handpiece unit 10.
[0029]
(Example 4)
FIG. 3 shows an oral tissue observation device according to a fourth embodiment of the present invention. In the present embodiment, as shown in the drawing, the light detecting means 12 adds not only the image sensor 21 but also the first to third light intensity detecting elements 40 to 42, so that not only the image display of the teeth, Fluorescence intensity emitted by irradiating the teeth with light is detected so that dental contamination such as caries or plaque can be easily displayed as an image.
[0030]
That is, by averaging the detection intensities of the first to third light intensity detection elements 40 to 42, variations in the detection intensities depending on the positions of the elements can be reduced. Variation can be further reduced by increasing the number of elements, so that the number of light intensity detection elements is not limited to three.
[0031]
(Example 5)
FIG. 4 shows an oral tissue observation device according to a fifth embodiment of the present invention. In the present embodiment, as shown in the figure, the signal processing unit 14 enlarges an image of an arbitrary portion of the oral tissue according to the signal intensity from the light intensity detection elements 40 to 42 in the fourth embodiment, and outputs the signal to the signal output unit. 15 for image display.
[0032]
In this embodiment, when the first carious part 51 and the second carious part 52 are observed in the tooth 50, the fluorescence intensity from the healthy part of the tooth 50 and the first carious part 51 and the second carious part 52 Since the fluorescence intensity from the carious part 52 is different, if the fluorescence intensity from the healthy part is set as a reference value, the fluorescence intensity when observing the carious part deviates from the reference value. By enlarging the image of the part where the color is, the visibility can be improved, and the carious part can be observed in more detail.
[0033]
(Example 6)
FIG. 5 shows an oral tissue observation apparatus according to Embodiment 6 of the present invention. In the present embodiment, as shown in the figure, the signal output unit 14 enlarges an image of an arbitrary portion of the oral tissue according to the signal intensity from the light intensity detection elements 40 to 42 in the fourth embodiment (there is no necessity). The image is output to the signal output means 15 and displayed as an image. In addition, a mark 60 is displayed on the oral tissue image in accordance with the signal intensity from the light intensity detection elements 40 to 42 so as to be displayed. I have to.
[0034]
In this embodiment, when the first carious part 51 and the second carious part 52 are observed in the tooth 50, the fluorescence intensity from the healthy part of the tooth 50 and the first carious part 51 and the second carious part 52 Since the fluorescence intensity from the carious part 52 is different, if the fluorescence intensity from the healthy part is set as a reference value, the fluorescence intensity when observing the carious part deviates from the reference value. By displaying the markings at the places where they are present, the visibility can be improved and the carious parts can be easily found. As in the case shown in the figure, it is also possible to use the method of detecting and marking the fluorescence intensity from the first carious part 51, which has advanced to a higher degree, according to the degree of caries.
[0035]
(Example 7)
FIG. 6 shows an oral tissue observation device according to a seventh embodiment of the present invention. In the present embodiment, as shown in the figure, the signal output unit 14 enlarges an image of an arbitrary portion of the oral tissue according to the signal intensity from the light intensity detection elements 40 to 42 in the fourth embodiment (there is no necessity). The image is output to the signal output unit 15 and displayed as an image. The contrast of the oral tissue image is arbitrarily changed according to the signal intensity from the light intensity detection elements 40 to 42. I have to.
[0036]
In the present embodiment, an image of an arbitrary portion of the tooth 50 is enlarged and communicated to the signal output unit 15 according to the detection signal intensity of the light intensity detection elements 40 to 42 and displayed as an image. When the carious part 51 and the second carious part 52 are observed, when the image is output to the screen by the signal output unit 15, the image is filtered, for example, so that the green light region of 510 nm to 560 nm is emphasized. By providing the contrast change area 70 in the image of the part 51, the visibility can be improved, and the carious part can be easily found.
[0037]
(Example 8)
FIG. 7 shows an oral tissue observation device according to an eighth embodiment of the present invention. In the present embodiment, as shown in the drawing, the control means 13 changes the irradiation time from the light sources 23 to 25 according to the signal intensity from the light intensity detection elements 40 to 42 in the fourth embodiment. .
[0038]
That is, it has been reported that the fluorescence decay time of the tooth 50 is shorter in the carious parts 51 and 52 than in the healthy part. Utilizing this phenomenon, by changing the irradiation time from the light sources 23 to 25 in accordance with the detection signal intensities of the light intensity detection elements 40 to 42, the carious parts 51 and 52 are image-displayed for a fixed time as an afterimage. Therefore, the carious part can be easily found. Since the fluorescence decay time of the tooth 50 is several tens of ns, if the irradiation time of the light sources 23 to 25 is several tens of ns, the healthy part is not displayed on the screen, but if there is a carious part, it is displayed on the screen as an afterimage. Will be. For example, assuming that the fluorescence decay times of the first carious portion 51 and the second carious portion 52 are 20 ns and 10 ns, respectively, and that the irradiation time of the light source is 15 ns, the light is indicated by a dotted line as shown in the figure. The second carious part 52 thus obtained has a shorter fluorescence decay time than the first carious part 51, so that it is difficult to visually recognize it on the screen, and the first carious part 51 can be more clearly observed.
[0039]
(Example 9)
Next, an oral tissue observation device according to a ninth embodiment of the present invention will be described. This embodiment will be described with reference to FIG. 4 shown in the fourth embodiment. The signal processing means 14 converts signals from the light intensity detection elements 40 to 42 into audio signals.
[0040]
That is, the signal processing unit 14 converts the signal into an audio signal in accordance with the signal intensity of the light intensity detection elements 40 to 42, and the audio signal is output by the signal output unit 15 together with the image information. When the first carious part 51 and the second carious part 52 are observed on the tooth 50, the fluorescence intensity from the healthy part of the tooth 50 and the first carious part 51 and the second carious part 52 Since the fluorescence intensity of the healthy part is different from the reference value, if the fluorescence intensity from the healthy part is set as the reference value, the fluorescence intensity at the time of observing the carious part deviates from the reference value. Is converted to a carious part, and the fact that it is a carious part is output by voice. This makes it possible to easily find caries and stained portions of the teeth without looking at the images.
[0041]
(Example 10)
Next, an oral tissue observation device according to a tenth embodiment of the present invention will be described. This embodiment will be described with reference to FIG. 4 shown in the fourth embodiment. The signal output means 14 changes the frequency of the sound in accordance with the signal intensity detected by the light intensity detection elements 40 to 42 and notifies the sound.
[0042]
In the present embodiment, when the first carious part 51 and the second carious part 52 are observed on the tooth 50, the fluorescence intensity level from the tooth changes according to the degree of caries. The frequency of the sound is changed according to the signal intensity of the light intensity detecting elements 40 to 42. For example, if the frequency is set to be higher as the degree of dental caries advances, the difference in the level of dental caries can be easily confirmed without looking at an image, and the degree of dental caries and dirt on the teeth can be easily found.
[0043]
(Example 11)
Next, an oral tissue observation device according to an eleventh embodiment of the present invention will be described. This embodiment will be described with reference to FIG. 4 shown in the fourth embodiment. The signal output means 14 notifies the voice message in accordance with the signal intensity detected by the light intensity detection elements 40 to 42.
[0044]
Although the sound is output when the carious part is observed, as in the ninth and tenth embodiments, in the present embodiment, the first carious part 51 and the second carious part 52 Is observed, the level of the fluorescence intensity from the teeth changes according to the degree of caries. Therefore, a voice message corresponding to the signal intensity of the light intensity detection elements 40 to 42 detected at this time is notified. For example, according to the degree of caries, if the initial caries is "reproducible level", if the caries are at a level where it is difficult to regenerate the tooth tissue by natural healing, "immediately, Please see a dentist's consultation "so that you can easily check the condition of your teeth even at home. That is, even if a general person other than a medical worker uses the image without looking at the image, the degree of dental caries and tooth contamination can be easily found.
[0045]
(Example 12)
FIG. 8 shows an oral tissue observation apparatus according to Embodiment 12 of the present invention. In the present embodiment, as shown in the figure, the light detecting means 12 includes an optical image magnifying element 80 at a position between the oral tissue and the imaging device 21, and the optical detecting means 12 is provided between the optical image magnifying element 80 and the oral tissue. The distance is changed arbitrarily.
[0046]
In the present embodiment, an optical image magnifying element 80 such as an optical lens is provided, and the distance between the oral tissue such as the teeth 50 and the imaging element 21 is arbitrarily changed, so that the desired caries 51 and 52 can be changed. The image can be enlarged and observed by the signal output means 15. Further, in conjunction with the image pickup device 21, the image may be automatically enlarged at a position where caries is detected.
[0047]
(Example 13)
FIG. 9 shows an oral tissue observation apparatus according to Embodiment 13 of the present invention. In the present embodiment, as shown in the figure, the handpiece unit 10 containing at least the illuminating unit 11 and the light detecting unit 12 is composed of a handpiece tip 81 and a handpiece base 82. It is made replaceable.
[0048]
In this embodiment, the handpiece portion 10 can be separated at the dividing portion 83 by holding the handpiece base portion 82 and rotating the handpiece tip portion 81. For this reason, it becomes convenient when disinfecting the handpiece tip 81, and the handpiece tip can be replaced with an easy-to-use handpiece tip according to the shape of the teeth and the position in the oral cavity, thereby improving workability.
[0049]
The configuration of each of the above-described embodiments 1 to 13 can be appropriately combined and adopted as needed, and is not limited to the configuration of each embodiment itself.
[0050]
【The invention's effect】
As described above, in the oral tissue observation device of the present invention, the illuminating means has a plurality of light sources having different wavelengths, and the light sources are switched and used by the control means to illuminate the oral tissue with light of different wavelengths. In this way, caries, especially early caries, can be detected early and safely without damaging the tissue.Dental and school stains as well as unpolished teeth and plaque can be detected not only at dental and school screening sites. Even at home, it is easily visible. In particular, by irradiating the oral cavity with multiple light sources having different wavelengths, such as ultraviolet light, blue light, green light, and red light, it is easy to find initial caries and plaque that cannot be clearly observed with white light. It becomes.
[Brief description of the drawings]
1A is an overall configuration diagram of a cavity tissue observation device according to a first embodiment of the present invention; FIG. 2B is a front view of a light source portion of the device; FIG. FIG. 3 (a) is a front view of a light source part of the apparatus. FIG. 3 (a) is a whole view of a cavity tissue observation apparatus according to a fourth embodiment of the present invention. FIG. 4 is an overall configuration diagram of a cavity tissue observation device according to a fifth embodiment of the present invention. FIG. 5 is an overall configuration diagram of a cavity tissue observation device according to a sixth embodiment of the present invention. FIG. 7 is an overall configuration diagram of a cavity tissue observation device according to an eighth embodiment of the present invention. FIG. 8 is an overall configuration diagram of a cavity tissue observation device according to a twelfth embodiment of the present invention. FIG. 10 is an overall configuration diagram of a cavity tissue observation device according to a thirteenth embodiment of the present invention. External view showing a configuration of a device [Description of symbols]
DESCRIPTION OF SYMBOLS 10 Handpiece part 11 Illumination means 12 Light detection means 13 Control means 14 Signal processing means 15 Signal output means 23-25 First to third light sources 32 to 34 First to third filters 40 to 42 First to third Light intensity detecting element 50 Tooth 60 Marking 70 Contrast change area 80 Optical image magnifying element 81 Handpiece tip 82 Handpiece base

Claims (13)

An illumination unit for illuminating the oral tissue, a light detection unit having an imaging element for imaging the oral tissue by irradiating the oral tissue with light from the illumination unit, and controlling the illumination unit and the light detection unit Control means, signal processing means for processing a signal from the light detection means, and signal output means for outputting a signal from the signal processing means, the illumination means has a plurality of light sources having different wavelengths, An oral tissue observation device for illuminating oral tissue with light of different wavelengths by using a light source switched by the control means. An illumination unit for illuminating the oral tissue, a light detection unit having an imaging element for imaging the oral tissue by irradiating the oral tissue with light from the illumination unit, and controlling the illumination unit and the light detection unit Control means, signal processing means for processing a signal from the light detection means, and signal output means for outputting a signal from the signal processing means, wherein the lighting means is different from a white light source and a plurality of wavelength components passing therethrough. An oral tissue observation apparatus that illuminates oral tissue with light of different wavelengths, using the plurality of filters by switching between the control means. The oral tissue observation device according to claim 1, wherein the signal processing unit wirelessly outputs the processed signal to the signal output unit. The oral tissue observation device according to any one of claims 1 to 3, wherein the light detection unit includes a light intensity detection element. The oral tissue observation device according to claim 4, wherein the signal processing unit enlarges an image of the oral tissue according to the signal intensity from the light intensity detection element and outputs the enlarged image to the signal output unit. The oral tissue observation device according to claim 4, wherein the signal output unit performs marking display on the oral tissue image in accordance with the signal intensity from the light intensity detection element. The oral tissue observation device according to any one of claims 4 to 6, wherein the signal output means arbitrarily changes the contrast of the oral tissue image according to the signal intensity from the light intensity detecting element. The oral tissue observation device according to any one of claims 4 to 7, wherein the control unit changes the irradiation time from the light source according to a signal intensity from the light intensity detection element. The oral tissue observation device according to any one of claims 4 to 8, wherein the signal processing unit converts a signal from the light intensity detection element into an audio signal. The oral tissue observation device according to claim 9, wherein the signal output unit changes the frequency of the sound in accordance with the signal intensity detected by the light intensity detection element to perform the notification. The oral tissue observation device according to claim 9, wherein the signal output unit notifies the voice message according to the signal intensity detected by the light intensity detection element. The light detecting means includes an optical image enlarging element at a position between the oral tissue and the imaging element, and arbitrarily changes a distance between the optical image enlarging element and the oral tissue. Item 2. The oral tissue observation device according to item 1. 13. The handpiece unit according to claim 1, wherein at least the illumination unit and the handpiece unit accommodating the light detection unit include a handpiece tip and a handpiece base, and the handpiece tip is replaceable. Oral tissue observation device.

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