JP6230153B2 - Chewing gum chewing reproduction device and stain removal degree evaluation method using the same - Google Patents

Description

  The present invention relates to a chewing gum mastication reproduction device that can reproduce a mastication action approximated by actual chewing gum chewing, and a stain removal degree evaluation that can be evaluated by assuming the degree of stain removal by actual chewing gum mastication using the same Regarding the method.

  Conventionally, chewing gum has been used as a favorite product, but recently, a tooth cleaning function by chewing gum chewing action has attracted attention. Therefore, many chewing gums effective for tooth cleaning have been proposed. For evaluation of the tooth cleaning function, a chewing device or method for directly performing a mastication test by a human or reproducing chewing gum mastication is used. However, the former human mastication test is not easy to use, although the actual use effect is obtained. Especially, the evaluation of many chewing gums under development uses chewing devices and methods that reproduce the latter chewing gum chewing exclusively. The frequency of use is high.

  As a chewing device that reproduces chewing gum chewing, a chewing gum composition for tooth whitening (see, for example, Patent Document 1) for removing a colored deposit from a tooth enamel surface, and a coloring-removable chewing gum composition (for example, Kleber et al. (See, for example, Non-Patent Document 1) used to evaluate whitening efficacy is known. However, the chewing device is such that a chewing gum is placed directly below the provided shaft, and a load of only pressing is applied to the chewing gum by repeated vertical vertical movements in which the shaft is swung down toward the chewing gum. It is.

  Next, as a method of reproducing chewing gum chewing, a method of rubbing a model stain prepared from hydroxyapatite pellets with a stain-removing gum composition for 1 minute is known (see, for example, Patent Document 3). However, in this method, only a friction load is applied to the chewing gum due to the act of polishing.

  Another way to reproduce chewing gum chewing is to rotate the stain model with a crayon melted and adhered to the center of the petri dish with a magnetic stirrer rotor coated with softened chewing gum for a certain period of time. It is known (for example, refer to Patent Document 4). However, this method is also loaded only with friction by the magnetic stirrer rotor.

Originally, when chewing food, the food is bitten, ground, and formed into a bolus that is easy to swallow. When chewing gum is chewed, due to its chewing property, it is not bitten or crushed and ground, but it is considered that a load consisting of pressing and friction due to teeth, which should be unique to chewing gum, is applied.
Therefore, the conventional chewing apparatus and method for reproducing chewing gum chewing as described above has room for improvement in that it reproduces a chewing action more similar to actual chewing gum chewing.

Special table 2004-522456 gazette Special table 2008-508272 JP 2000-189060 A JP 2000-342187 A

Kleber, C. J. (1981) A Mastication Device Designed for the Evaluation of Chewing Gums, J. Dent. Res., Vol. 60, pp. 109-114.

  The present invention has been made in view of the circumstances as described above, and the object of the present invention is to use a chewing gum mastication reproduction device capable of reproducing a chewing action approximated by actual chewing gum chewing, and using the same It is in providing the stain removal degree evaluation method which can be evaluated supposing the degree of stain removal by actual chewing gum chewing.

  The present invention is a chewing gum mastication reproduction device for reproducing chewing gum chewing, comprising: an attaching means for attaching the chewing gum; a turning means for rotating around the attaching means; and a chewing gum surface attached to the attaching means. Fixing means for fixing pseudo teeth for contact, and the chewing gum that is mounted on the mounting means and circulates by the turning means receives a load due to pressure and friction when contacting the pseudo teeth fixed to the fixing means The above-mentioned object is achieved by a chewing gum mastication reproduction device which is positioned so as to reproduce chewing gum softening during chewing by rotating the swivel means a plurality of times.

Preferably, the above-described chewing gum mastication reproducing apparatus is a stain removal degree evaluation method for evaluating the stain removal degree of the pseudo-stain-attached pseudo teeth by actual chewing gum mastication, and the following (1) to (5) are sequentially performed This is a stain removal degree evaluation method to be performed.
(1) Measure Lab value 1 (L ₁ a ₁ b ₁ ) of stain-attached pseudo teeth in advance (2) Install chewing gum on the attachment means of the chewing gum mastication reproduction device, and fix the stain-attached pseudo teeth on the fixing means (3) Rotating the swiveling means provided with the mounting means of (2) to bring the chewing gum and the stain-attached pseudo tooth into contact with each other a plurality of times (4) (3) Measure Lab value 2 (L ₂ a ₂ b ₂ ) (5) Calculate the color difference (ΔE) from the Lab values (Lab value 1 and Lab value 2) measured in (1) and (4) above, and determine the degree of stain removal. Evaluate

  More preferably, during the implementation of (3), the chewing gum surface is trimmed every round between the contact between the chewing gum and the stain-attached pseudo tooth and the next contact.

  That is, as a result of intensive studies on a method of applying the same load as chewing gum chewing in order to reproduce the chewing action approximated by actual chewing gum chewing in the chewing device, the present inventors contacted chewing gum and pseudo teeth. When the chewing gum is moved on the surface of the pseudo tooth while applying a load to the chewing gum, attention has been paid to the fact that both the pressure and the friction are applied to the chewing gum.

Therefore, if the chewing gum is circulated and positioning is performed so that the fixed pseudo teeth are subjected to a load caused by pressing and friction with respect to the chewing gum that circulates, the circulating chewing gum approaches, contacts, presses, frictions, and separations of the pseudo teeth. It is possible to apply a load due to multiple times of pressing and friction on the chewing gum by repeating this lap several times and performing this series of operations, approximating by actual chewing gum chewing We found that mastication can be reproduced. And it came to this invention by setting it as the chewing gum mastication reproduction apparatus provided with the mounting means, the turning means, and the fixing means so that this series of operation | movement could be act | operated.

  Next, when the method of using the above chewing gum mastication reproduction device was examined, it was found that the chewing gum having a tooth cleaning function can be evaluated assuming the degree of stain removal by actual chewing gum mastication, and the present invention has been achieved.

  Since the chewing gum mastication reproducing apparatus of the present invention can simultaneously apply two loads to the chewing gum by pressing and friction with pseudo teeth, it is possible to reproduce the chewing action approximated by actual chewing gum mastication.

  When using the chewing gum mastication reproduction apparatus of the present invention, the removal test of tooth surface stains (stain, plaque, food residue, etc.) by chewing gum, the elution test of aroma, flavor, specific components, etc. mixed in chewing gum, tooth adhesion of chewing gum ( For any test that requires chewing gum chewing (such as the prevention of teething) test, accurate information gathering assuming actual chewing gum chewing can be expected under certain conditions.

  The stain removal degree evaluation method of the present invention can be evaluated assuming a stain removal degree by actual chewing gum chewing.

The front view which shows one Embodiment of the chewing gum mastication reproduction apparatus of this invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an embodiment of the chewing gum mastication reproducing apparatus of the present invention. In the figure, the chewing gum mastication reproduction apparatus 1 is for contacting the surface of the chewing gum 11 mounted on the mounting means 2, the mounting means 2 for mounting the chewing gum 11, the turning means 3 for rotating around the mounting means 2. Fixing means 4 for fixing the pseudo teeth 12.

  The mounting means 2 is equipped with the chewing gum 11 and is provided in the turning means 3, and includes a mounting portion 2a, a locking portion 2b, and a support portion 2c. The mounting part 2 a is a part where the chewing gum 11 is mounted on the mounting means 2. The diameter (or long side) is, for example, about 4 to 8 mm when a 1.5 g chewing gum is attached. In addition, what is necessary is just to set suitably the shape of the mounting part 2a, such as a cylinder and a prism (a triangle note, a quadratic prism, a pentagonal prism, etc.).

  The chewing gum 11 is attached by covering the mounting portion 2a with the chewing gum 11 and covering the tip of the mounting portion 2a so that the chewing gum 11 has a thickness of 5 to 15 mm. This thickness is appropriately set depending on the position with the pseudo tooth 12 fixed to the fixing means 4. Further, every time the turning means 3 described later circulates, adjusting the shape of the chewing gum 11 so that the chewing gum 11 at the tip of the mounting portion 2a has a predetermined thickness gives a load due to predetermined pressing and friction. It is suitable.

  The chewing gum 11 to be attached is used as it is or softened. The softening is performed by humidification, but it is preferable that the softening is performed while being in contact with the aqueous medium in terms of easy wearing and imparting appropriate tackiness. For example, in the case of 1.5 g of chewing gum, it is preferable to use a chewing gum that is softened by adding 2.5 ml of water and then left at 37 ° C. for 60 minutes, because it is easy to wear and can reproduce the chewing gum physical properties during chewing in the oral cavity. .

  The locking portion 2b is located at a position where the support portion 2c and the mounting portion 2a are linked, and is designed to be larger than the diameter (or long side) of the mounting portion 2a. That is, since the locking portion 2b is larger than the diameter (or long side) of the mounting portion 2a, the chewing gum 11 is pushed up toward the locking portion 2b when the chewing gum 11 mounted on the mounting portion 2a and the pseudo tooth 12 contact each other. By adopting this structure, the chewing gum 11 can be easily subjected to a load caused by pressing and friction when contacting the pseudo teeth 12. The diameter (or long side) is, for example, about 10 to 15 mm when the above-described 1.5 g of chewing gum is attached. In addition, what is necessary is just to set suitably the shape of the latching | locking part 2b, such as a cylinder and a prism (a triangle note, a quadratic prism, a pentagonal prism, etc.).

  Next, the support portion 2 c is a part for mounting and fixing the mounting unit 2 to the turning unit 3. The support portion 2 c is positioned so that the mounting portion 2 a can be mounted and fixed in a state where the mounting portion 2 a protrudes outward from the outer edge of the turning means 3. The mounting portion 2a, the locking portion 2b, and the support portion 2c may be integrally formed as the mounting portion 2, or the molded portions may be combined and integrated.

  As a method of mounting and fixing the support portion 2c to the turning means 3, for example, the turning means 3 and the mounting means 2 can be joined. Alternatively, the turning means 3 may be provided with a pair of rails 3b so that the support portion 2c can be slidably mounted on the rail 3b, and the support portion 2c can be detachable. In this case, it is possible to attach and detach the mounting means 2 from the turning means 3, and it is preferable that the chewing gum 11 is attached and detached and the mounting means 2 is easily cleaned. Furthermore, it is also preferable in that the mounting means 2 can be mounted or changed at an arbitrary position of the turning means 3.

  In FIG. 1, the mounting portion 2a and the support portion 2c are cylindrical with the same diameter, but they may have different diameters (or long sides). However, the locking portion 2b needs to be designed to have a larger diameter (or longer side) than the mounting portion 2a in order to function as a stopper of the chewing gum 11.

  Next, the turning means 3 includes the attaching means 2 and makes the chewing gum 11 attached to the attaching means 2 circulate. Therefore, the turning means 3 includes a turning drive unit (not shown), and the turning means 3 is rotated in the X direction with the center portion 3a as the center axis in the horizontal direction with respect to the ground. Preferably, it is desirable to provide a speed controller so that the chewing gum chewing reproduction speed can be adjusted to a circumferential speed of 2 to 12 rotations / minute.

  In FIG. 1, the turning means 3 is provided with eight rails 3b, and the mounting means 2 can be attached to and detached from the eight rails 3b. In addition, the number of the rails 3b for providing the mounting means 2 in the turning means 3 is not limited to eight places, What is necessary is just to provide suitably. In FIG. 1, a pair of rails 3b is used, but one or a plurality of rails 3b may be used as long as they are detachable.

  Further, the turning means 3 may be rotated in either the X direction or the opposite direction of X. Further, in FIG. 1, the turning means 3 circulates in a direction perpendicular to the ground. However, when the turning means 3 and the fixing means 4 are positioned as will be described later, an angle for turning the turning means 3 is set. What is necessary is just to select suitably from 90 degrees of perpendicular | vertical to horizontal with respect to the ground. By adopting these configurations, by continuously rotating the swivel means 3, when the chewing gum comes into contact with the artificial tooth, two loads due to pressing and friction are continuously applied a plurality of times. This is important because it can reproduce the softening of chewing gum.

  Moreover, when using the chewing gum mastication reproduction apparatus of this invention for a chewing test, what is necessary is just to select suitably the number of chewing gums 11 with which the turning means 3 is mounted | worn with the mounting means 2 according to the content of a test.

  For example, in the case of a dissolution test of aromatic components and functional components blended in chewing gum, the chewing gum 11 is mounted on one mounting means 2, and the chewing gum 12 is rotated around a specific number of times to contact the pseudo tooth 12 for a specific number of times. By analyzing the components to be analyzed, the trend of the components can be searched.

  On the other hand, in the case of a test in which the degree of dirt removal by chewing gum is estimated from pseudo teeth, if the same chewing gum 11 is respectively attached to a plurality of attachment means 2, the test time can be shortened compared with the case where the chewing gum 11 is attached to one place. Can be planned.

  Next, the fixing means 4 fixes the pseudo teeth 12 with which the chewing gum 11 circulated by the turning means 3 comes into contact. In addition, the position of the fixing means 4 is positioned and installed so as to receive a load due to pressing and friction when the chewing gum 11 that goes around contacts the pseudo tooth 12.

  Specifically, when the surface of the chewing gum 11 that goes around comes into contact with the pseudo teeth 12, it is placed in a state where it is closer than it is in contact, that is, in a state where a load is applied so as to press. As for the installation method, a spring-type balance is installed under the fixing means 4, positioning is performed so that a load of 5 to 50 g is applied when the chewing gum 11 and the pseudo tooth 12 come into contact, and after removing the spring-type balance, The fixing means 4 is installed at the position.

  Positioning in this way allows the rotating chewing gum 11 to move toward the pseudo teeth 12 and make a series of movements such as approach, contact, pressing and friction, and separation, and more closely approximates two loads due to pressing and friction in actual chewing gum chewing It is important in that it can be reproduced. In addition, the pseudo teeth 12 are fixed to the fixing means 4 by using an adhesive fixing material such as a double-sided tape, a dent is formed in the fixing means 4, and the pseudo teeth 12 are fitted in the dent. It can be selected as appropriate.

In addition, it is preferable that the fixing means 4 is made of an elastic material, in that the load caused by pressing during chewing gum chewing can be reproduced. The elastic material fixing means 4 means the fixing means 4 whose deformation force is set to 1 to 90 N, and the deformation force means the force applied to the fixing means 4 and the fixing means at that time. Refers to the force of difference from the repulsive force from 4. Specifically, a value calculated by calculating the sum of forces when an area of 19.6 mm ² is loaded at a speed of 20 mm / min and the state is maintained for 2 seconds so that the surface of the fixing means 4 is lowered by 0.3 mm. The value obtained by subtracting the measured value measured by applying a load under the same condition using a rheometer C12-500DX (manufactured by Sun Science Co., Ltd.) as the repulsive force of the fixing means 4 is the deformation force (unit N). To do.

  Examples of the elastic material include an elastic body such as sponge, silicon, or rubber. Further, the material may be a material in which the whole fixing means 4 is elastic, or a part thereof may be an elastic material.

  Next, as the pseudo teeth 12, hydroxyapatite, bovine tooth enamel, glass slides, etc. as they are, or stain adhesion, stain model adhesion, plaque stain application, tooth surface stain application, periodontal disease bacteria, etc. In this case, those treated by culturing or adhering bacteria in the oral cavity are used.

  In this way, the chewing gum mastication reproduction device of the present invention can receive both loads due to pressing and friction when the chewing gum comes into contact with the pseudo tooth, so that the chewing gum approximated by actual chewing gum chewing The behavior can be reproduced.

That is, in the actual chewing gum chewing, the pressure corresponding to the act of chewing the chewing gum with teeth is applied to the thickness of the chewing gum 11 at the tip of the mounting portion 2a of the mounting means 2, the locking portion 2b of the mounting means 2, and the positioning of the fixing means 4 This is reproduced by the elastic fixing means 4 or the like.
Further, in chewing gum chewing, when chewing gum is chewed with teeth, the chewing gum is deformed and spreads, and the friction corresponding to the action of rubbing the tooth surface and the chewing gum, in particular, the thickness of the chewing gum 11 of the mounting portion 2a of the mounting means 2, the mounting means This is reproduced by the two engaging portions 2b, the turning means 3 and the like. And it becomes possible to reproduce the actual chewing gum mastication by which the said press and friction are repeated simultaneously and repeatedly by making the turning means 3 go around several times.

  As described above, the chewing gum mastication reproduction apparatus of the present invention is a test for removing tooth surface stains (stain, plaque, food residue, etc.) by chewing gum, an elution test for aroma, flavor, specific components, etc. mixed in chewing gum, and tooth adhesion of chewing gum. It can be applied to any test that requires chewing gum chewing such as (prevention of teeth) test. Therefore, accurate information collection assuming actual chewing gum mastication under certain conditions is possible based on comparison of chewing gum and pseudo teeth before and after the chewing reproduction test by the apparatus of the present invention.

  Next, the chewing gum mastication reproduction apparatus of the present invention is used as follows in order to evaluate the degree of stain removal assuming the degree of stain removal of the stain-attached pseudo teeth by actual chewing gum mastication.

  First, a stain adhesion pseudo tooth is created in advance. The stain-attached pseudo tooth preparation method includes, for example, a method of coloring hydroxyapatite by immersing it in a dyeing solution. As the dyeing solution, Japanese tea extract, black tea extract, coffee solution, ferric chloride solution , Chlorhexidine solution, oral bacterial solution and the like.

Next, Lab value 1 (L ₁ a ₁ b ₁ ) of the stain-attached pseudo tooth is measured. Lab value of stain adhesion pseudo teeth is measured with, for example, a spectrocolorimeter CM-700d manufactured by Konica Minolta Co., Ltd., a digital colorimetric color difference meter ND-101DP type manufactured by Nippon Denshoku Industries Co., Ltd., and based on JISZ8729 Indicated by the Lab color system.

  Next, chewing gum is mounted on the mounting means of the chewing gum mastication reproduction apparatus of the present invention, and the stain-attached pseudo teeth are fixed to the fixing means.

  Then, the turning means provided with the attaching means to which the chewing gum is attached is made to circulate so that the chewing gum and the stain-attached pseudo tooth are brought into contact with each other a plurality of times (by the number of laps). In this way, when the chewing gum comes into contact with the stain-attached pseudo tooth, two loads due to pressing and friction are continuously applied a plurality of times. The number of contact between the chewing gum and the stain-attached pseudo tooth may be set as appropriate assuming the load of the target chewing test. For example, it is assumed that adult chewing gum chewing for 3 minutes is 270 to 300 times.

  Further, preferably, an operation of adjusting the shape of the chewing gum surface is performed for each round between the contact between the chewing gum and the stain-attached pseudo tooth and the next contact. That is, when the chewing gum at the tip of the mounting means is shaped so as to have a predetermined thickness each time it circulates by the turning means, the chewing gum also assumes movement of the tongue, masticatory muscles, cheek muscles, etc. during actual chewing gum chewing It is preferable in that mastication can be reproduced and a load due to predetermined pressing and friction can be applied. Examples of the working method of adjusting the shape include adjusting with human hands, adjusting with human hands while adding water.

Next, the Lab value 2 (L ₂ a ₂ b ₂ ) of the stain-attached pseudo tooth after contacting the chewing gum and the stain-attached pseudo tooth a plurality of times is measured. Then, a color difference (ΔE (Delta E)) is calculated from the measured Lab values (Lab value 1 and Lab value 2), and the degree of stain removal is evaluated. Here, if the color difference (ΔE) is 8 or more and less than 10, it is recognized that there is a tendency of stain removal. Preferably, when the color difference (ΔE) is a value larger than 10, it can be evaluated that the stain is completely removed.
ΔE can be expressed by the following equation.

  As described above, the stain removal degree evaluation method of the present invention measures the stain adhesion pseudo teeth before and after the mastication reproduction test by the mastication device, and assumes the stain removal degree by actual chewing gum mastication from the comparison of the results. Can be evaluated. In the above, a general Lab color system has been mentioned as a color measurement method for stain-attached pseudo teeth before and after the mastication reproduction test, but other XYZ color systems, Munsell color systems, Lch color systems, etc. May be used.

Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.
<Preparation of chewing gum>
Each raw material was prepared and mixed and dispersed using a kneader so as to have the composition shown in Table 1, and after making it into a chewing gum dough, extruded into a plate shape with an extruder, and then molded and cut. The plate-like chewing gum of Test Example 2 (width 19 mm × length 80 mm × thickness 1.6 mm, weight 3.1 g / piece) was prepared.

<Creation of stain-attached pseudo teeth>
Hydroxyapatite (10 mm × 10 mm × thickness 2 mm, apatite pellet APP-100, manufactured by Pentax Co., Ltd.) was immersed in a 2% bovine serum albumin aqueous solution for 10 minutes and then naturally dried for 10 minutes. Next, after 10 minutes of natural drying for 10 minutes in black tea extract, 10 minutes of natural drying for 10 minutes in 0.05% ferric chloride hexahydrate solution, soaking and drying of this black tea extract, and chlorination Stain-attached pseudo teeth were created by dipping and drying the ferric hexahydrate solution a total of 10 times.

  Using the chewing gum mastication reproduction apparatus of the present invention, the degree of stain removal of the stain-attached pseudo teeth by the chewing gums of Test Example 1 and Test Example 2 was evaluated.

<Example>
First, the Lab value 1 (L ₁ a ₁ b ₁ ) of the stain-attached pseudo tooth was measured.
Next, the chewing gum of Test Example 1 was mounted as the chewing gum 11 on the mounting means 2 of the chewing gum mastication reproduction apparatus 1 shown in FIG. 1, and the stain-attached pseudo tooth as the pseudo tooth 12 was fixed to the fixing means 4.
Note that the mounting means 2 were all cylindrical and used a mounting portion 2a having a diameter of 5 mm, a locking portion 2b having a diameter of 13 mm, and a supporting portion 2c having a diameter of 11 mm.
As for the chewing gum to be worn, the chewing gum of Test Example 1 was cut and weighed to 1.5 g, 2.5 ml of water was added in advance and left at 37 ° C. for 60 minutes to soften, and then around the wearing portion 2a of the wearing means 2 The tip of the mounting portion 2a was covered with the chewing gum 11 of Test Example 1 so as to have a thickness of 12 mm.
The fixing means 4 is positioned so that a load of 20 g is applied when the chewing gum 11 of the test example 1 and the stain adhering pseudo tooth 12 come into contact with each other. The fixing means 4 is a quadrangular prism shape of 40 mm × 75 mm × height 13 mm and has a deformation force of 45 N. Was used.

Next, the turning means 3 provided with the attaching means 2 to which the chewing gum 11 of the test example 1 is attached is rotated 270 times at a rotation speed of 4.5 rotations / minute, and the chewing gum 11 of the test example 1 and the stain adherence. By making the pseudo teeth 12 contact 270 times, two loads of pressing and friction were continuously applied 270 times at the time of contact.
Note that the chewing gum 11 of the test example 1 at the tip of the mounting portion 2a has a thickness of 12 mm after every turn from the contact between the chewing gum 11 of the test example 1 and the stain-attached pseudo tooth 12 until the next contact. The work to prepare the shape was done manually.

Next, the Lab value 2 (L ₂ a ₂ b ₂ ) of the stain-attached pseudo tooth 12 after the chewing gum 11 of Test Example 1 and the stain-attached pseudo tooth 12 were contacted 270 times was measured. Table 1 shows the color difference (ΔE) calculated from the measured Lab values (Lab value 1 and Lab value 2).
Next, the same operation as in Test Example 1 was performed for the chewing gum of Test Example 2, and the color difference (ΔE) of the stain-attached pseudo teeth 12 before and after the chewing reproduction test by the chewing gum mastication reproduction apparatus 1 was calculated. Also shown.

  From the comparison of the color difference (ΔE) between Test Example 1 and Test Example 2, it can be evaluated that the stain removal degree is high because the value of Test Example 1 is large. Moreover, since the color difference (ΔE) of Test Example 1 is 11.5, it can be evaluated that the stain has been completely removed.

  Next, the chewing gums of Test Example 1 and Test Example 2 were directly chewed by three professional panelists, and the tooth surface dirt removal property by the human chewing test was evaluated. The evaluation method was performed as follows.

<Reference example>
<Evaluation of tooth surface dirt removal by human chewing test>
First, the tooth surface on the lip side and cheek side was washed by brushing with a toothbrush, and moisture on the tooth surface was wiped off. Next, apply the tooth surface dyeing solution on 16 lips and cheeks (4 from the central incisor to the third molar, 16 in total, top, bottom, left, and right) to stain the entire tooth surface. did. Thereafter, the stained tooth surface was dried by natural drying to form a dyed coating film on the tooth surface.
Next, chewing gum (3.1 g) of Test Example 1 was chewed for 5 minutes around the stained teeth. The saliva was chewed while taking care not to stay in the oral cavity.

After mastication, based on the preset value of the tooth surface staining index, the soil removability was determined numerically for each tooth surface, and the total number of values for 16 tooth surfaces was calculated and used as a measurement score. The average value of the measurement score by three professional panelists is also shown in Table 1 as the measurement score.
The tooth surface staining index value used is divided into four stages of 0 to 3 on the tooth surface staining state, and the point where the stained portion is completely eliminated and the tooth surface stain removability is high is set to 0. A low score on the tooth surface stain was set so that a large score was obtained.
Therefore, the measurement score for 16 tooth surfaces was calculated within a range of 0 to 48 points, and it was evaluated that the tooth surface dirt was removed as the measurement score was smaller. Then, less than 31 points, which is less than 65% of the total of 48 points from which the tooth surface dirt was not removed, was judged that the tooth face dirt was removed, and the measurement score was evaluated as follows.
○: 0 to 31 points, and tooth surface dirt removability is recognized. ×: 31 points to 48 points and no tooth face dirt removability. Next, the chewing gum of Test Example 2 is also the chewing gum of Test Example 1. The same test was conducted to evaluate the removal of tooth surface stains. The results are also shown in Table 1.

As a result of the evaluation, Test Example 1 showed tooth surface dirt removal property, but Test Example 2 did not show tooth surface dirt removal property, and Test Example 1 had higher tooth surface dirt removal property. This is the same result as the example performed using the chewing gum mastication reproduction apparatus 1 of the present invention, and it can be seen that the chewing gum mastication reproduction apparatus 1 of the present invention has high reproducibility of actual chewing gum mastication performed by humans. .

Next, the stain removability with respect to the stain model adhesion petri dish by the chewing gum of the said test example 1 and the test example 2 was evaluated using the method of reproducing the chewing gum chewing conventionally used.
<Preparation of petri dish with stain model>
About 1 mg of crayon was placed at the center of the bottom of the petri dish (inner diameter 55 mm, height 12 mm), heated with a hot plate, and spread into a circle with a diameter of about 10 mm to prepare a petri dish with a stain model.

<Comparative example>
The surface of a magnetic stirrer rotor (length: 25 mm, center diameter: 8 mm, diameter at both ends: 7 mm) was coated with the chewing gum of Test Example 1 which was left to soften at 50 ° C. for 30 minutes. A petri dish (inner diameter: 55 mm, height: 12 mm) was charged with 15 ml of water, and the chewing gum coating rotor was rotated slowly so that the surface area of the chewing gum in contact with the glass surface was substantially constant (about 8 mm × 20 mm).

12.6 ml of distilled water was put into the petri dish with the stain model, and the chewing gum coating rotator was rotated at 200 rpm for 2 minutes.
In the stain removability evaluation, the stain area attached at the beginning of the stain attached to the stain model and the remaining stain area after desorption by the rotation of the chewing gum coating rotator were visually evaluated, and the results are shown in Table 1. Shown in
Next, also about the chewing gum of Test Example 2, the same treatment as the chewing gum of Test Example 1 was performed, and the stain removability was evaluated. The results are also shown in Table 1.

  As a result of visual evaluation, both of Test Example 1 and Test Example 2 are in a state in which most of the stain remains, no stain removability is observed, and there is a large difference in stain removability between Test Example 1 and Test Example 2. It can be seen that there is no reproducibility of actual chewing gum chewing performed by humans.

  As a result of the above evaluation, both the examples using the chewing gum mastication reproduction apparatus of the present invention and the reference examples based on the human mastication test, the chewing gum containing calcium carbonate, which is a known component as a tooth abrasive (Test Example 1), is not contained. Stain removability was higher than that of the test sample (Test Example 2). On the other hand, in Comparative Example, neither Test Example 1 nor Test Example 2 showed stain removability, and the difference between the two could not be evaluated.

  From this, it can be said that the chewing gum mastication reproduction device of the present invention can reproduce the mastication action approximated by chewing gum mastication by an actual human. Further, when the degree of stain removal is evaluated using the chewing gum mastication reproducing apparatus of the present invention, an evaluation result equivalent to the degree of stain removal by actual chewing gum mastication can be obtained.

DESCRIPTION OF SYMBOLS 1 Chewing gum mastication reproduction apparatus 2 Wearing means 3 Turning means 4 Fixing means 11 Chewing gum 12 Pseudo teeth

Claims (3)

A chewing gum mastication reproduction device for reproducing chewing gum mastication, comprising: an attaching means for attaching chewing gum; a turning means for rotating around the attaching means; and a surface for chewing gum attached to the attaching means Fixing means for fixing the pseudo teeth, and the chewing gum that is mounted on the mounting means and circulates by the turning means is positioned so as to receive a load due to pressure and friction when contacting the pseudo teeth fixed to the fixing means. A chewing gum mastication reproduction device that reproduces chewing gum softening during chewing by rotating the swivel means a plurality of times. A method for evaluating the degree of stain removal evaluated using the chewing gum mastication reproduction apparatus according to claim 1 by assuming the degree of stain removal of a stain-attached pseudo tooth by actual chewing gum mastication, comprising the following (1) to (5): Stain removal degree evaluation method performed sequentially.
(1) Lab value 1 (L ₁ a ₁ b ₁ ) of the stain-attached pseudo teeth is measured in advance. (2) The chewing gum is attached to the attachment means of the chewing gum mastication reproduction apparatus according to claim 1, and the stain attachment is attached to the fixing means. (3) The swiveling means provided with the mounting means of (2) is rotated to bring the chewing gum and the stain-attached pseudo tooth into contact with each other a plurality of times. (4) The stain after the execution of (3) Measure Lab Lab 2 (L ₂ a ₂ b ₂ ) (5) Calculate the color difference (ΔE) from the Lab values (Lab 1 and Lab 2) measured in (1) and (4) above. , Evaluate the degree of stain removal The stain removal degree evaluation method according to claim 2, wherein during the operation (3), an operation for adjusting the chewing gum surface for each round is performed from the contact between the chewing gum and the stain-attached pseudo tooth until the next contact.

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