JPH105254A - Periodontal disease cecal sac measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the presence and progress of periodontal disease by photographing and displaying an irregular reflection of periodontal caecum as an examined part without contact to show the size of the periodontal caecum. SOLUTION: In this device, light is radiated from a light projector 1 to a periodontal caecum between the tooth and the gum, and the light is irregularly reflected at the periodontal caecum, and goes transparently through the outer circumference of the gum 30 and is captured. Based on an image photographed by a light receiving means 2 which photographs a condition of the periodontal caecum 32, a size of the periodontal caecum 32 is displayed on a display means 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring periodontal disease cecum.

[0002]

2. Description of the Related Art In order to know the progress of a cecal sac of a periodontal disease, it is necessary to measure the depth of the cecum formed in the periodontal. An example of an apparatus used for that purpose is disclosed in, for example, Japanese Patent Application Laid-Open No. 4-12749. In this device, a plurality of notches of different lengths are formed in parallel on the side of the tip of the measuring rod inserted into the cul-de-sac, and the distance between the tip of each notch and the tip is However, it is becoming larger gradually. In each notch, light is introduced from an optical fiber, and when the tip of the measuring rod is inserted into the cul-de-sac, by recognizing which notch tip emits light, It measures the depth of the cecum.

[0003]

However, in the above configuration, in order to accurately measure the depth of the cecum,
It is necessary for the tip of the measuring rod to be completely inserted into the cul-de-sac. However, whether or not the insertion has been completed is determined by observing the reaction of the patient, which is painful for the patient.

[0004] Therefore, an object of the present invention is to provide a periodontal disease cul-de-sac measuring apparatus free from such a problem.

[0005]

Means for Solving the Problems In order to solve the above-mentioned technical problem, the technical means taken in the invention according to claim 1 is to light the periodontal cecum formed between the teeth and the gums. Light receiving means for capturing the state of the periodontal sac by catching that the light radiated from the light emitting means is diffusely reflected within the periodontal sac and transmitted through the gum periphery. Means and a periodontal disease cul-de-sac measuring device having display means for displaying the size of the periodontal cecum from an image picked up by the light receiving means.

[0006]

In the above configuration, the size of the periodontal cyst is displayed in a non-contact manner by imaging and displaying the diffuse reflection state of the periodontal cecum as the inspected site, and the presence / absence / progress of periodontal disease The condition can be measured.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an apparatus for measuring periodontal disease cecum according to the present invention.

In FIG. 1, the apparatus for measuring periodontal disease cecum includes a grip portion 9. The light receiving section 2 is connected to the left side of the holding section 9 via a flexible tube or a gooseneck 8. An opening is formed below the light receiving unit 2,
The mirror 3 is accommodated in the light receiving section 2 so as to form an angle of about 45 degrees with the opening. A lens 5 is accommodated in the light receiving unit 2 so as to be positioned above the mirror 3.
This lens 5 is preferably of a telecentric type. The light captured by the mirror 3 of the light receiving unit 2 is
It can be captured by a CCD camera 12 via an optical fiber 7 penetrating a flexible tube or gooseneck 8 and a gripper 9 and an eyepiece 10. The object imaged by the CCD camera 12 is displayed on a monitor 13.

A flexible tube-shaped light projecting portion 1 is connected to the base of the light receiving portion 2 in such a manner as to be branched.
The light projecting section 2 is provided with a lens 4.
Then, the laser beam transmitted from the light source 11 via the grip 9 and the flexible tube or the gooseneck 8 is irradiated.

In order to actually use the above-configured apparatus for measuring periodontal disease cecum, as shown in FIG. 2, the user holds the gripper 9 by hand and holds the light emitting unit 4 between the tooth 31 and the gum 30. And the opening of the light receiving part 3 is directed to the outer periphery of the gum 30. When the light source 11 is turned on after that, the laser beam is irradiated from the lens 2 toward the periodontal cecum 32. As shown in FIG. 3, the laser beam is diffusely reflected in the periodontal disease cecum 32 and passes through the gum 31. The light that has passed through the gum 31 is captured by the CCD camera 12 via the mirror 3, the lens 5 and the optical fiber 7, and a laser spot 40 indicating the state of the periodontal disease cecum 32 and the bottom of the periodontal disease cecum 32 is monitored. 13 (FIG. 4). Since the scale is also displayed on the screen, the size of the periodontal disease cul-de-sac 32 can also be ignored. Note that even if the distance between the light receiving unit 2 and the gum 31 changes, the size of the image on the monota 13 does not change if the lens 5 is of a telecentric type.

The apparatus for measuring periodontal disease cecum shown in FIG.
The monitor 13 with the image processing device 14 is employed in place of the monitor 13 with the scale of the device shown in FIG. In this device, the periodontal disease cecum 32 is imaged by the CCD camera 12, and this image (FIG. 6) is binarized by the image processing device 14 as shown in FIG. You.
By calculating the position of the center of gravity of the laser spot 40 indicating the bottom of the periodontal disease cecum 32 from the binarized image, the length L from the center of gravity to the upper end of the gum 31, that is, the periodontal disease cecum 32 The depth is measured and displayed. Thus,
The presence / absence / progress status of the periodontal disease cecum 32 can be grasped without contact.

[0012]

As described above, according to the first aspect of the present invention, since the depth of the periodontal disease cecum can be measured in a non-contact manner, the patient can be accurately measured without causing any pain. Can recognize periodontal disease cecum.

[Brief description of the drawings]

FIG. 1 is a diagram of a first embodiment of a device for measuring periodontal disease cecum of the present invention.

FIG. 2 is an explanatory diagram of a use mode of the device shown in FIG.

FIG. 3 is an explanatory view of the principle of the device shown in FIG.

FIG. 4 is a diagram showing a display mode of a display unit of the device shown in FIG.

FIG. 5 is a diagram of a second embodiment of the apparatus for measuring periodontal disease cecum of the present invention.

FIG. 6 is a photograph of a periodontal disease cecum and its vicinity.

FIG. 7 is a diagram showing a binarized image of a periodontal disease cecum.

8 is a diagram showing a display mode of a display unit of the device shown in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 light emitting part (light emitting means) 2 light receiving part (light receiving means) 13 monitor (display means) 30 gums 31 teeth 32 periodontal cecum

Claims (1)

[Claims] 1. A light projecting means for irradiating light toward a periodontal cyst formed between a tooth and a gum, wherein the light irradiated from the light projecting means is irregularly reflected in the periodontal cecum and Periodontal having light receiving means for capturing the state of the periodontal cecum by capturing the light passing through the gum periphery and display means for displaying the size of the periodontal cecum from an image taken by the light receiving means Disease cul-de-sac measurement device.