JPWO2013154001A1 - Artificial teeth - Google Patents

Abstract

The artificial tooth according to the present embodiment is an artificial tooth that is used as a substitute for a missing tooth, and has a plurality of grooves parallel to each other formed in a cutout shape on the occlusal surface. Thus, food is crushed and chewed by the grooves formed in the artificial teeth during the mortar movement of the upper and lower dentitions.

Description

Import by reference

  This application claims the priority of Japanese Patent Application No. 2012-091017 filed on April 12, 2012, and is incorporated herein by reference.

  The present invention relates to an artificial tooth.

  Currently, in Japan, which has reached a super-aging society, the number of people with eating and dysphagia has increased dramatically. Therefore, improvement of masticatory ability by artificial teeth (dentures) is an important issue.

  The shape of the artificial tooth is an anatomical artificial tooth that mimics the shape of a natural tooth, a quasi-anatomical artificial tooth that is similar to the shape of a natural tooth, but has a reduced degree of inclination of the cusp, and an occlusal surface that improves chewing ability. It can be roughly divided into three types of non-anatomical artificial teeth with artificial shapes. At present, semi-anatomical artificial teeth are most frequently used in Japan. Further, as non-anatomical artificial teeth, for example, zero-degree molars in which the inclination of the cusp is zero degrees, and, for example, Labin blade teeth in which a metal blade is arranged on the occlusal surface are known (see Patent Document 1). ). In addition, various techniques relating to artificial teeth are known (see Patent Documents 2 and 3 and Non-Patent Document 1).

  Patent Document 1 discloses a technique that can grind food with an artificial front tooth or the like provided with a ridge that forms a rubbing surface that can be in rubbing contact with opposing teeth on the side of the tongue. Patent Document 2 discloses a technique related to an artificial molar having an occlusal form in which an occlusion close to bilateral balanced occlusion (full balanced occlusion) is obtained and change to lingualized occlusion (lingualized occlusion) is possible. It is disclosed.

U.S. Pat. No. 4,031,623 JP 2010-162331 A JP 2002-177301 A

Atsuko Sugimoto, Carolina M. Iegami, Shoyo Iida, Manya Naito, Mayumi Torigoe, Regina Tamaki, Shogo Minaki, New Grain Size Analysis Method for Mastication Independent of Food Species, Japan Prosthodontic Society, 120th, p215, 2011

  However, the conventional artificial teeth cannot improve the chewing ability for both hard foods and soft foods.

  That is, for example, the blade molar disclosed in Patent Document 1 is efficient for drilling hard food such as meat, but is not suitable for chewing relatively soft food such as cooked rice. Therefore, when trying to eat cooked rice with blade molars, cooked rice could not be cooked well.

  In addition, for example, the zero degree molars described above are efficient for chewing relatively soft foods, but the inclination of the cusp is zero degrees, and thus are not suitable for foods that require perforation. Therefore, when trying to eat hard food with zero degree molars, great force was applied to the gingiva, causing pain.

  This invention is made | formed in view of said point, The objective is to provide the artificial tooth which makes it possible to grind and chew various kinds of foodstuffs smoothly.

  In order to achieve the above object, an artificial tooth according to the present invention is an artificial tooth that is used as a substitute for a missing tooth, and a plurality of grooves parallel to each other are formed in a cutout shape on the occlusal surface. It is characterized by that.

  According to the present invention, various kinds of foods can be smoothly pulverized and chewed.

It is a figure which shows the outline | summary of the artificial tooth which concerns on this embodiment. It is a figure which shows the biting of the artificial tooth which concerns on this embodiment. It is a figure which shows the cross-sectional example of the artificial tooth which concerns on this embodiment. It is a figure which shows the cross-sectional example of the artificial tooth which concerns on this embodiment. It is a figure which shows the modification of the artificial tooth which concerns on this embodiment. It is a figure which shows the masticatory efficiency by the artificial tooth which concerns on this embodiment. It is a figure which shows the masticatory efficiency by the artificial tooth which concerns on a reference example. It is a figure which shows the subjective evaluation improvement effect of the denture by the patient himself at the time of mastication by the artificial tooth which concerns on this embodiment.

  The artificial tooth according to the present embodiment is an artificial tooth that is used as a substitute for a missing tooth, and has a structure in which a plurality of grooves parallel to each other are formed in a cutout shape on the occlusal surface, thereby providing a hard food material. It enables smooth crushing and chewing of various foods including soft and soft foods. Hereinafter, embodiments of the present technology will be described.

[Outline of artificial teeth]
FIG. 1 is a diagram showing an outline of an artificial tooth according to this embodiment. FIG. 1 schematically shows a maxillary dentition 1 and a mandibular dentition 2 to which artificial teeth 10 and 20 according to this embodiment are attached. In addition, these artificial teeth 10 and 20 are used by being mounted as substitutes for missing teeth.

  In the maxillary dentition 1 and the mandibular dentition 2 shown in FIG. 1, the first premolars 11, the second premolars 12, the first molars 13, the second molars 14, and the mandibular teeth included in the maxillary dentitions 1 The first premolar 21, the second premolar 22, the first premolar 23, and the second premolar 24 included in the row 2 are the artificial teeth 10 and 20 according to the present embodiment, respectively. The artificial teeth to which the present invention is applicable are not limited to the teeth included in these artificial teeth 10 and artificial teeth 20.

  The occlusal surfaces 10A and 20A that are the surfaces of the artificial tooth 10 and the artificial tooth 20 according to the present embodiment are inclined at a predetermined angle with respect to the dentition direction 3 and are parallel to each other in a plurality of oblique grooves 15. 25 are formed in a notch shape at a predetermined interval, for example, 1 mm.

  FIG. 2 is a diagram illustrating occlusion of artificial teeth according to the present embodiment. FIG. 2 schematically shows the state of the grooves 15 and 25 when the maxillary dentition 1 and the mandibular dentition 2 are bitten together. In FIG. 2, the grooves 15 and 25 are indicated by dotted lines and solid lines, respectively.

  As shown in FIG. 2, the groove 15 and the groove 25 are each formed in a straight line so as to intersect at a right angle or an angle close to a right angle when engaged. Thus, by forming the groove 15 and the groove 25 so as to intersect at the time of occlusion, food is crushed and chewed between the groove 15 and the groove 25 during the mortar movement of the maxillary dentition 1 and the mandibular dentition 2. It becomes possible.

  The artificial teeth 10 and 20 are made of various materials such as hard resin, resin, polycarbonate, porcelain, metal such as cobalt chromium alloy and titanium alloy, fine ceramics such as zirconia, and the like.

  3A and 3B are views showing a cross-sectional example of the artificial tooth according to the present embodiment. In FIG. 3A and FIG. 3B, the cross section of the 1st molar 13 of FIG. 1 is mentioned as an example. In the first molar 13 shown in FIG. 3A, four grooves 15 of grooves 15a, 15b, 15c, and 15d are formed. On the other hand, in the first molar 13 shown in FIG. 3B, five grooves 15 of grooves 15e, 15f, 15g, 15h, and 15i are formed.

  3A and 3B, intervals d1 and d2 indicate the width and depth of the groove 15, respectively. It is preferable that the distance d1 is about 0.5 mm to 1 mm or longer and the distance d2 is about 0.5 mm to 1 mm or longer from the viewpoint of reducing gingival pain during mastication while maintaining the strength of the artificial tooth 10. . In FIG. 3A, the intervals d1 and d2 may be different for each of the grooves 15a, 15b, 15c, and 15d. The same applies to FIG. 3B.

  In the example shown in FIG. 3A, the cusp 13a is relatively pointed, and in order to maintain the pointed shape of the cusp 13a, the lingual grooves 15a, 15b are formed so as to avoid the cusp 13a. . On the other hand, in the example shown in FIG. 3B, the cusp 13b is flat compared to the cusp 13a of FIG. 3A and is formed to be round toward the outer side 13c. Even if a groove is provided in the cusp 13b, the general shape of the cusp 13b is shown. Can be maintained. Therefore, the groove 15f is formed in the approximate center of the cusp 13b. By forming the groove 15 according to the shape of the cusps 13a and 13b in this way, the lingual occlusion, that is, the cusps 13a and 13b on the lingual side of the first molar 13 are the centers of the opposing first molars 23. Occlusion that fits into a fossa (not shown) can be realized.

  FIG. 4 is a view showing a modification of the artificial tooth according to the present embodiment. In FIG. 4, the first molar 23 of FIG. 1 is shown as an example. The first molar 23 shown in FIG. 4 is configured such that the depth of the groove is made zero at the lingual end 25a of the groove 25 or is backfilled with another member such as a plastic. Thereby, the discomfort felt by the patient when the tongue hits the tongue side end 25a of the groove 25 can be suppressed. Not only the tongue side end 25a of the groove 25 but also the cheek side end 25b may have the same configuration. Moreover, the form formed so that the groove | channel 25 may become shallow gradually as it goes to the lingual end 25a from the center of the 1st molar 23 may be sufficient.

  As described above, in the artificial teeth 10 and 20 according to the present embodiment, the grooves 15 and 25 inclined with respect to the dentition direction 3 are formed, respectively. Further, the grooves 15 and the grooves 25 are formed so as to intersect at a right angle or an angle close to a right angle at the time of occlusion. Thereby, both a hard food material and a soft food material can be smoothly pulverized and chewed. The artificial teeth 10 and 20 can be applied to both complete dentures and partial dentures. It can also be applied to partial dentures in which the counter teeth are natural teeth.

[Mastication efficiency of artificial teeth]
FIG. 5 is a diagram showing the masticatory efficiency by the artificial tooth according to the present embodiment. FIG. 6 is a diagram illustrating the masticatory efficiency of the artificial tooth according to the reference example.

  In FIG. 5, the experimental result of the masticatory efficiency of the artificial teeth 10 and 20 which concern on this embodiment is shown. The masticatory efficiency experiment here is an experiment of examining the relationship between the number of mastication and the masticatory efficiency when ginseng as a test food is chewed on a machine equipped with the artificial teeth 10 and 20 according to the present embodiment. .

  Here, the slope of the regression line and the intercept value are adopted as indices indicating the masticatory efficiency. The regression line is a regression line determined by the least square method with respect to the particle size distribution in which the test foods are arranged in order of particle diameter after chewing (see Non-Patent Document 1, etc.). The slope and intercept value of this regression line are shown on the horizontal and vertical axes of FIG. 5, respectively. In the graph shown in FIG. 5, the lower the left area, the better the masticatory efficiency.

  The plots 30a to 30g shown in FIG. 5 indicate the masticatory efficiency when the number of chewing times is 6, 9, 12, 15, 18, 21, and 24, respectively. As shown in the plot 30a of FIG. 5, the artificial teeth 10 and 20 according to the present embodiment are already close to the normal range after six chewing cycles. Further, as shown in plots 30f and 30g, the plot position is included in the normal range when the number of chewing times exceeds 20.

  On the other hand, in FIG. 6, the experimental result of the masticatory efficiency of the conventional artificial tooth is shown. Plots 40a to 40g shown in FIG. 6 indicate the masticatory efficiency when chewing times are 6, 9, 12, 15, 18, 21, and 24, respectively. As shown in the plot 40a of FIG. 6, in the conventional artificial tooth, the number of chewing times is far from the normal range. Moreover, as shown in plots 40f and 40g, even if the number of chewing times exceeds 20, the position of the plot is not necessarily included in the normal range.

  As described above, according to the artificial teeth 10 and 20 according to the present embodiment, while having a high masticatory efficiency with a small number of chewing cycles, it is possible to eat food that cannot be chewed with conventional artificial teeth. It becomes possible.

[Effect of artificial teeth]
FIG. 7 is a diagram showing the effect of improving the subjective evaluation of the denture by the patient himself during mastication with the artificial tooth according to the present embodiment.

  FIG. 7 shows the pain evaluation results by the VAS (Visual analog scale) method of a patient wearing three types of artificial teeth, that is, a conventional artificial tooth, a condition 1 artificial tooth, and a condition 2 artificial tooth. The evaluation value when there is no pain is 0, and the evaluation value when pain is maximum is 100.

The conventional artificial tooth is a semi-anatomical artificial tooth. The artificial tooth of condition 1 is artificial teeth 10 and 20 having a slit groove depth d2 (see FIG. 3) of less than 0.5 mm. The artificial teeth of condition 2 are artificial teeth 10 and 20 having a slit groove depth d2 of 1.00 mm.

  In this case, as shown in the table of FIG. 7, in any of the patients 1 to 3, the artificial tooth of condition 2, that is, the pain during mastication by the artificial teeth 10 and 20 according to the present embodiment, that is, gingiva It has been found that pain can be greatly improved.

  As described above, according to the artificial teeth 10 and 20 according to the present embodiment, the masticatory efficiency can be remarkably improved while following the existing occlusion theory such as lingual occlusion, and Pain can be improved.

  Although the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited to such specific configurations, and various modifications and equivalents within the spirit of the appended claims Includes configuration.

3 Dental row 10, 20 Artificial tooth 10A, 20A Occlusal surface 13a, 13b Nipple 15, 25 Groove

[0002]
Patent Literature [0006]
Patent Document 1: US Pat. No. 4,016,623 Specification Patent Document 2: JP 2010-162331 A Patent Document 3: JP 2002-177301 A Non-patent Document [0007]
Non-Patent Document 1: Sugimoto Atsuko, Carolina M. et al. Iegami, Shoyo Iida, Manya Naito, Mayumi Torigoe, Shogo Minagi, Shogo Minagi, Food type independent chewing ability evaluation method by new particle size analysis, Japan Prosthodontic Society, 120th, p215, 2011
SUMMARY OF THE INVENTION Problems to be Solved by the Invention [0008]
However, the conventional artificial teeth cannot improve the chewing ability for both hard foods and soft foods.
[0009]
That is, for example, the blade molar disclosed in Patent Document 1 is efficient for drilling hard food such as meat, but is not suitable for chewing relatively soft food such as cooked rice. Therefore, when trying to eat cooked rice with blade molars, cooked rice could not be cooked well.
[0010]
In addition, for example, the zero degree molars described above are efficient for chewing relatively soft foods, but the inclination of the cusp is zero degrees, and thus are not suitable for foods that require perforation. Therefore, when trying to eat hard food with zero degree molars, great force was applied to the gingiva, causing pain.
[0011]
This invention is made | formed in view of said point, The objective is to provide the artificial tooth which makes it possible to grind and chew various kinds of foodstuffs smoothly.
Means for Solving the Problems [0012]
In order to achieve the above object, an artificial tooth according to the present invention is an artificial tooth that forms a cusp imitating the shape of a natural molar and is used as a substitute for a missing tooth. A plurality of linear grooves parallel to the surface are formed in a cutout shape avoiding the cusp, and the upper and lower jaw grooves intersect at right angles when engaged. To do.

Claims (6)

An artificial tooth that is used as a substitute for a missing tooth,
An artificial tooth in which a plurality of grooves parallel to each other are formed in a cutout shape on the occlusal surface. The artificial tooth according to claim 1,
An artificial tooth in which the groove is formed in a straight line that intersects the dentition direction at a predetermined angle. The artificial tooth according to claim 1 or 2,
An artificial tooth in which the groove is formed avoiding the cusp. The artificial tooth according to claim 3,
The artificial teeth are formed so that the groove gradually becomes shallower toward the lingual side. The artificial tooth according to claim 3,
The groove is an artificial tooth in which the end on the lingual side is backfilled. The artificial tooth according to claim 2,
An artificial tooth formed in a direction in which the grooves intersect when the artificial teeth are engaged with each other.

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