JP3077955B2 - Occlusal pressure diagnostic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an occlusal pressure diagnosing device for diagnosing the bite state of teeth using an occlusal pressure diagnosing sheet provided with a wax layer on one or both sides of a pressure-sensitive sheet.

[0002]

2. Description of the Related Art In the field of dental care, carbon paper has been widely used for diagnosing the state of bite of a tooth. The carbon paper is inserted between the upper and lower teeth of the patient, and in this state, the patient strongly bites, thereby coloring only the portion where the upper and lower teeth contact. The dentist diagnoses the bite state of the patient from the position and area of the color developed on the carbon paper.

[0003]

However, the method using the carbon paper only detects that the upper and lower teeth are in contact, and cannot detect the pressure of the teeth, that is, the occlusal pressure. For this reason, the occlusal pressure must be predicted from the state of color development of the carbon paper, and there has been a problem that the diagnosis of the occlusal condition is likely to be inaccurate and it is difficult to correctly determine a treatment policy.

Further, in order to make a vivid color development at the portion where the teeth touch, it is necessary to touch the upper and lower teeth several times with a click, or shift the chin left and right to rub the carbon paper contact portion of the tooth with the tip of the tooth. It was necessary to do.

[0005] In addition, since the position where the tooth is in contact with the entire dental arch is unclear, the dentist must look into the oral cavity of the patient and work while checking the position of the carbon paper. For this reason, there was a problem that workability was poor.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is possible to accurately detect the distribution of occlusal pressure that changes for each occlusal position in a dental arch, and to accurately detect the occlusal state. It is necessary to provide an occlusal pressure diagnostic device that can obtain extremely effective data for accurate diagnosis and treatment policy determination, can easily receive a diagnosis for patients, and can simplify the work for dentists. Aim.

[0007]

According to the present invention, an object of the present invention is to provide an occlusal pressure diagnostic apparatus for performing occlusal diagnosis using an occlusal pressure diagnostic sheet provided with a wax layer on at least one side of a pressure-sensitive sheet. A first scanner for reading an image of a damaged dental arch, a second scanner for reading the density of the tooth mold recorded on the pressure-sensitive sheet, and an occlusal pressure for converting the density read by the second scanner into pressure Detecting means, gradation conversion means for converting the obtained change in the occlusal pressure into a predetermined gradation display, and superimposing the image of the dental arch on the distribution of the occlusal pressure displayed in gradation.
This is achieved by an occlusal pressure diagnosing device , which comprises a display means capable of displaying.

The first and second scanners can be constituted by one scanner by using one scanner separately in time. Also, the occlusal pressure diagnostic sheet changes the color of the wax layer and the color of the pressure-sensitive sheet, preferably both of them to have complementary colors, and the first and second scanners respectively use the color of the wax layer and the pressure-sensitive sheet. And the color of the color is selectively read. It is desirable that the gradation of the occlusal pressure be displayed in color, and that the display color of the occlusal pressure be superimposed and displayed in a manner different from the color of the image of the wax layer. The display means may selectively display the image of the dental arch and the distribution of the occlusal pressure.

[0009]

FIG. 1 is a plan view of an occlusal pressure diagnostic sheet used in the present invention, FIG. 2 is a cross-sectional view showing its structure, and FIG. 3 is a graph showing the change in color density with respect to pressure. In FIG. 2, reference numeral 10 denotes a sheet-shaped support made of synthetic resin, for example, a PET (polyethylene terephthalate) film having a thickness of 25 μm is used. Reference numeral 12 denotes a developer coating layer, which is formed by applying a solution obtained by dispersing an acid clay (montmorillonite) sulfuric acid-treated product in water containing caustic soda to one surface (surface) of the support 10 and drying the solution. is there.

Reference numeral 14 denotes a color-developing agent coating layer formed on the color-developing agent coating layer 12, which is formed by dissolving a color developing agent such as 1-phenyl-1-xylylethane in oil and microencapsulating the same. is there. Here, the microcapsules are adjusted to various strengths, and the microcapsules to be destroyed change according to the pressure. When the microcapsules are destroyed by the pressure, the color developing agent therein is absorbed by the color developing agent together with the oil to form a color. In this embodiment, the color is red. The color density increases with increasing pressure. FIG. 3 shows a change in the concentration D with respect to a change in the pressure P.

Reference numeral 16 denotes a back waterproof layer, which is formed of the same PET film as the support 10, for example, a 16 μm transparent film. An adhesive type paste is applied to one surface of the back waterproof layer 16 to form an adhesive layer 18. The back waterproof layer 16 is adhered to the back surface of the support 10 (the surface opposite to the developer application layer 12) by the adhesive layer 18.

Reference numeral 20 denotes a front waterproof layer, which is formed of a transparent PET film having a thickness of 16 μm similarly to the back waterproof layer 16. The front waterproof layer 20 is overlaid on the color forming agent coating layer 14, and is adhered to the adhesive layer 18 of the back waterproof layer 16 along the outer periphery of the support 10. In this case, it is desirable that the pressure between the waterproof layers 16 and 20 be sufficiently reduced and evacuated.

The pressure-sensitive sheet 22 thus configured is
Since the back waterproof layer 16 and the front waterproof layer 20 are hermetically sealed, the water resistance is improved and the reliability is increased. One waterproof layer 1
Since 6 is adhered to the back surface of the support 10, the back waterproof layer 16 does not peel off or move with respect to the support 10. Therefore, the front waterproof layer 20, the periphery of which is adhesively fixed to the back waterproof layer 16, does not move with respect to the support 10.

As shown in FIG. 1, the pressure-sensitive sheet 22 is formed in a substantially horseshoe shape along the dental arch, and wax layers 24 and 26 are laminated on both sides thereof. The wax layers 24 and 26 are formed by uniformly applying a paraffin wax for dental use (JIS-T-6502) to a thickness of, for example, 0.35 ± 0.03 mm. The occlusal pressure diagnostic sheet 28 is completed by applying the wax layers 24 and 26 in this manner.

The occlusal pressure diagnostic sheet 28 is put in the open mouth of the patient, and is attached to the upper part of the upper dentition on average. When the patient gently bites, the entire tooth shape of the dental arch is recorded as irregularities on the wax layers 24 and 26. At the same time, the pressure applied between the upper and lower teeth is applied to the pressure-sensitive sheet 22, and only the portion where the pressure is applied develops a color according to the magnitude of the pressure. In this embodiment, the color is red.

The occlusal pressure diagnostic sheet 28 in which the shapes of the dental arches are recorded on the wax layers 24 and 26 and the color development of the density corresponding to the occlusal pressure is recorded on the pressure-sensitive sheet 22 is taken out from the mouth of the patient. The occlusal pressure diagnosis is performed by the occlusal pressure diagnosing device according to the present invention. When the color of the pressure-sensitive sheet 22 is red, it is preferable that the wax layers 24 and 26 have a color close to green, which is a complementary color of red, in order to facilitate reading.

FIG. 4 is a functional block diagram of this device, FIG. 5 is a block diagram showing the same configuration, FIG. 6 is an operation flowchart, and FIG.
FIG. 4 is a diagram showing an example of output to a display means.

4 and 5, reference numeral 30 denotes an upper scanner.
32 is a lower scanner. These are for reading images of the upper surface and the lower surface of the recorded occlusal pressure diagnostic sheet 28, and are formed by a color scanner.

In this embodiment, the upper and lower scanners 30,
Numeral 32 indicates an image read twice, a first read reads an uneven image of the dental arch recorded on, for example, the wax layers 24, 26, and a color read density recorded on the pressure-sensitive sheet 22 in the second read. Read. That is, each scanner 30, 3
Reference numeral 2 also functions as a first scanner for reading the images of the wax layers 24 and 26 and a second scanner for reading the color density of the pressure-sensitive sheet 22.

Reference numerals 34 and 36 denote memories, which are images read by the scanners 30 and 32, processed images,
Alternatively, the result of various calculations is recorded. In FIG. 5, 38 is a CPU, 40 is a keyboard, 42 is a CRT as display means, and 44 is a printer as display means. These are interconnected by a bus 46. The memories 34 and 36 and the scanners 30 and 32 are also connected to the bus 46.

Reference numeral 48 denotes an image processing unit,
The image read at 32 is subjected to various spatial filtering processes such as an outline enhancement process and an averaging process. Reference numeral 50 denotes density detecting means for detecting the color density of the pressure-sensitive sheet 22. 52 is a pressure P with respect to the density D output from the density detecting means 50.
Is an occlusal pressure detecting means that calculates using the PD characteristic curve of FIG.

Reference numeral 54 denotes a gradation conversion means for determining a display gradation with respect to the obtained occlusal pressure. For example, a different color is designated for each predetermined occlusal pressure range, and places with different occlusal pressures are displayed in different colors.

[0024] The part of this case 70Kg / cm ² or more of the pressure in the red, the part of the 60~70Kg / cm ² in purple, 50
６０60Kg / cm ² in blue, 40-50Kg / c
It can be specified that the part of m ² is displayed in green, the part of 30 to 40 Kg / cm ² is displayed in yellow, and the part of 30 kg / cm ² or less is displayed in orange.

Reference numeral 56 denotes an occlusal pressure center calculating means for calculating the occlusal pressure center, that is, the center of gravity G, from the distribution of the occlusal pressure obtained by the occlusal pressure detecting means 52.

Next, the operation of this embodiment will be described with reference to FIG. First, the occlusal pressure diagnostic sheet 28 bitten by the patient is set between the upper and lower scanners 30 and 32. By the first scan, the scanners 30 and 32 read the uneven images of the wax layers 24 and 26 (step 100). This image is subjected to processing such as contour enhancement in the image processing section 48 (step 102), and then stored in the memories 34 and 36 (step 104).

By the second scan, the scanner 30,
Reference numeral 32 reads a color image on the pressure-sensitive sheet 22 (step 10).
6). Based on the outputs of the scanners 30 and 32, the density of the color image is obtained by the density detecting means 50 (step 108). The pressure P corresponding to the density D, that is, the occlusal pressure is determined by the occlusal pressure detecting means 5 using the PD characteristic curvature shown in FIG.
2 (step 110).

The obtained occlusal pressure is converted by the gradation conversion means 54 into a color corresponding to the magnitude of the pressure (step 11).
2) is stored in the memories 34 and 36 (step 11)
4). The occlusal pressure center calculating means 56 calculates the occlusal pressure center G from the occlusal pressure distribution state (step 116) and stores it in the memories 34 and 36 (step 114).

The images of the wax layers 24 and 26 stored in the memories 34 and 36 and the distribution image of the occlusal pressure P obtained from the color density of the pressure-sensitive sheet 22 are synthesized (step 11).
8), output to display means 42, 44 (step 12)
0). As shown in FIG. 7, it is desirable that this composite image is displayed with the upper dental arch facing the screen and the lower dental arch facing the bottom of the screen.

Here, A is an uneven image of the wax layers 24 and 26, for example, displayed in light gray. B indicates the occlusal pressure distribution obtained from the density of the pressure-sensitive sheet 22, and is displayed in a color corresponding to the magnitude of the pressure as described above. The center of gravity G _U of the upper dental arch in this screen, and the center of gravity G _L of the lower dental arch is displayed superimposed. The displayed image may be output to the printer 44. On this screen, a scale S indicating the relationship between the pressure range of the occlusal pressure and the display color is displayed on the right side.

In the above embodiment, the unevenness image A of the wax layers 24 and 26, the occlusal pressure distribution B, and the occlusal pressure center G are all superimposed and displayed. Two or more may be selectively displayed. For example, if only the image A of the wax layers 24 and 26 is displayed, it is possible to easily know whether the tooth alignment is good or not.

Although the occlusal pressure center G is determined in this embodiment, various data such as the occlusal pressure front / rear / left / right balance and the occlusal area area balance may be determined and displayed instead.

[0033]

As described above, according to the first aspect of the present invention, it is possible to display the uneven image by the dental arch recorded on the wax layer on the image showing the distribution of the occlusal pressure recorded on the pressure-sensitive sheet. Therefore, it is possible to accurately know the distribution of occlusal pressure while judging the positional relationship between the two, and to obtain effective data for accurate diagnosis of occlusal conditions and decision of treatment policy. it can.

Further, the patient can easily receive a diagnosis by biting the occlusal pressure diagnostic sheet once, and the dentist can monitor the position of the teeth and the occlusal site only from the output image without continuously monitoring the inside of the patient's mouth. Can be easily determined, and the operation can be simplified.

Here, if the first and second scanners use the same scanner separately in time, one scanner is sufficient (claim 2 ). The occlusal pressure diagnostic sheet changes the color of the wax layer to the color of the pressure-sensitive sheet, and makes these colors as close to complementary colors as possible. Reading can be performed separately (Claim 3 ).

It is desirable that the display of the occlusal pressure be a color display (claims 4 and 5 ). In this case, the color indicating the occlusal pressure distribution is distinguished from the unevenness image of the wax layer by making it a different color. It becomes easy to diagnose (claim 6 ).

[Brief description of the drawings]

FIG. 1 is a plan view of an occlusal pressure diagnostic sheet used in the present invention.

FIG. 2 is a partial cross-sectional view of an occlusal pressure diagnostic sheet.

FIG. 3 is a pressure-concentration characteristic curve diagram of a pressure-sensitive sheet.

FIG. 4 is a functional block diagram of one embodiment of the present invention.

FIG. 5 is a block diagram of the same configuration.

FIG. 6 is a flowchart of the same operation.

FIG. 7 is a diagram showing a display example of a display unit.

[Explanation of symbols]

 Reference Signs List 22 pressure-sensitive sheet 24, 26 wax layer 28 occlusal pressure diagnostic sheet 30, 32 scanner 34, 36 memory 42 CRT 44 as display means printer 48 as display means 48 image processing means 50 density detection means 52 occlusal pressure detection means 54 gradation Conversion means 56 Occlusion pressure center calculation means

Claims (6)

(57) [Claims] 1. An occlusal pressure diagnostic apparatus for performing an occlusal diagnosis using an occlusal pressure diagnostic sheet provided with a wax layer on at least one side of a pressure-sensitive sheet, wherein an image of a dental arch recorded on the wax layer is read. A second scanner for reading the density of the tooth mold recorded on the pressure-sensitive sheet; an occlusal pressure detecting means for converting the density read by the second scanner into pressure; Occlusion characterized by comprising gradation conversion means for converting a change into a predetermined gradation display, and display means capable of displaying the image of the dental arch superimposed on the distribution of the occlusal pressure displayed in gradation. Pressure diagnostic device. 2. The apparatus according to claim 1, wherein the first scanner and the second scanner are formed by one scanner, and are used as the first scanner and the second scanner by dividing the operation time of the scanner. Item 10. The occlusal pressure diagnostic device of Item 1. 3. The occlusal pressure diagnostic sheet has a color of the wax layer different from a color of the pressure-sensitive sheet, and the first scanner has the color of the wax layer, and the second scanner has the color of the wax. 2. The occlusal pressure diagnostic device according to claim 1, wherein the color of the color of the pressure sheet is selectively read. 4. A gradation converting means any of the occlusal pressure diagnostic apparatus according to claim 1 to 3 for converting a change in occlusion pressure gradation display including color. Wherein the display means either of the occlusal pressure diagnostic apparatus according to claim 1-4 which is formed by the color display can be output printer. 6. The occlusal pressure diagnostic apparatus according to claim 5 , wherein the display means displays the image of the dental arch and a gradation display indicating the occlusal pressure in different colors.