JP2014147629A - Artificial tooth and plate denture, and method of producing artificial tooth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a keeping hole in an artificial tooth with good performance.SOLUTION: A keeping hole 8 is a through hole that penetrates an artificial tooth 6, and the inner surface of the keeping hole 8 is a smooth face with no cut mark.

Description

  The present invention relates to an artificial tooth having a maintenance hole (a through-hole that allows intrusion of a molding material of a denture base), a denture, and a method for producing the artificial tooth.

In this type of field, it is desirable to prevent as much as possible the removal of the artificial teeth from the denture base (made of resin) from the viewpoint of improving the durability of the denture base (dentures). For example, when an artificial tooth is detached in the oral cavity, various problems (such as accidental ingestion and deterioration in aesthetics) occur, and early repair is required.
For this reason, conventionally, various attempts have been made to prevent detachment of artificial teeth. For example, by applying a primer to the surface of the artificial tooth and chemically adhering it to the denture base (made of resin), the occlusion of the artificial tooth can be reduced. However, this type of work is complicated, and the applied primer is difficult to confirm because the applied primer is transparent. For this reason, it often relies on the skill of the manufacturer, and there are cases where the mounting stability of the artificial teeth is lacking due to the occurrence of uneven coating.

In the technique disclosed in Patent Document 1, a drill is used to form through holes (maintenance holes) that penetrate the artificial teeth in the direction in which the artificial teeth are arranged.
Next, at the time of molding of the denture base (made of resin), the artificial tooth is attached to the denture base in an embedded state by causing the molding material of the denture base to enter the maintenance hole provided in the artificial tooth. According to this known technique, the molding material is solidified in the maintenance hole (by exerting an anchor action), whereby the attachment stability of the artificial tooth to the denture base can be improved.
The thickness dimension of typical artificial teeth in the buccal tongue direction is relatively narrow, typically about 2 mm to 5 mm. For this reason, in a typical artificial tooth, the space for forming the maintenance hole is limited (especially, the mandibular anterior tooth is conspicuously lacking in space), and a very small maintenance hole is formed.

JP 2012-65928 A

However, in the configuration of the known technique (formation of a maintenance hole using a drill), cutting marks (spiral irregularities) and burrs are generated on the inner surface of the maintenance hole (see FIG. 7B). And in the above-mentioned maintenance hole (minimum), the cutting trace and the burr | flash become resistance, and the penetration | invasion of the molding material to a maintenance hole may become inadequate by stopping the flow of a molding material. In addition, vibration during the cutting process may cause the artificial tooth to break easily due to micro cracks generated in the artificial tooth (which tends to be insufficient in strength).
However, the penetration of the molding material can be promoted by increasing the diameter of the maintenance hole. However, as described above, there is a certain limit due to the space of the artificial tooth, and increasing the diameter of the maintenance hole reduces the strength of the artificial tooth itself and causes breakage.
The present invention has been devised in view of the above points, and a problem to be solved by the present invention is to form a maintenance hole in an artificial tooth with good performance.

As means for solving the above-mentioned problems, the artificial tooth of the first invention is an artificial tooth that can be attached to a resin-made denture base. In the present invention, when the denture base is molded, the artificial tooth can be embedded in the denture base by allowing the denture base molding material to enter the maintenance hole provided in the artificial tooth. In this type of configuration, it is desirable that the maintenance hole can be formed in the artificial tooth with good performance (for example, excellent mounting stability).
So, in this invention, while the above-mentioned maintenance hole is a through-hole which penetrates an artificial tooth, the inner surface of a maintenance hole is made into the smooth surface which does not have a cutting trace. Thus, in this invention, since the inner surface of a maintenance hole is a smooth surface which does not have a cutting trace, the molding material of a denture base can be penetrate | invaded smoothly (it can be set as the structure excellent in attachment stability).

The artificial tooth of the second invention is the artificial tooth of the first invention, and a maintenance hole (a maintenance hole having a smooth surface having no cutting trace) is formed by a laser.
Therefore, in the present invention, the artificial tooth is made of a resin containing a granular material having an average particle diameter of 1 μm or less formed of at least one of an inorganic pigment and silica. Then, the artificial teeth are in the range of 0.1 wt% or more and less than 40 wt% in total of 0 wt% or more and less than 40 wt% inorganic pigment granules and 0 wt% or more and less than 20 wt% silica granules. contains.
In the present invention, transpiration of artificial teeth during laser irradiation can be promoted with a predetermined amount of granular materials (maintenance holes can be formed with good performance).

The artificial tooth of the third invention is the artificial tooth of the second invention, wherein a crosslinking agent is added in the range of 0.1 wt% or more and less than 40 wt%.
In the present invention, the maintenance holes can be formed with better performance by making the artificial teeth (made of resin containing granular materials) into a crosslinked structure.

  The denture of the fourth invention is a denture having a plurality or one of the artificial teeth (artificial teeth excellent in attachment stability) of any of the first to third inventions.

The artificial tooth of the 5th invention is the manufacturing method of the artificial tooth of any one of the 1st invention-the 3rd invention, and a maintenance hole can be efficiently formed in an artificial tooth in the following 1st process-3rd process.
First step: Create a mold material that can hold the artificial tooth in a state in which the maintenance hole forming position faces the laser beam irradiation direction and includes a through-hole portion through which the laser beam can pass.
Second step: A plurality of mold materials are arranged side by side, and artificial teeth are respectively arranged on the plurality of mold materials.
Third step: A maintenance hole is formed in the artificial tooth held by each mold material while sequentially facing the laser to a plurality of mold materials.

  According to the first aspect of the present invention, the maintenance hole can be formed in the artificial tooth with good performance. According to the second invention, the maintenance hole can be formed in the artificial tooth with better performance. According to the third invention, the maintenance hole can be formed in the artificial tooth with better performance. Moreover, according to the 4th invention, the performance of a bed denture can be improved. And according to 5th invention, a maintenance hole can be formed efficiently.

It is a perspective view of a denture. It is a side view of an artificial tooth. It is a schematic sectional drawing of a denture. It is a schematic sectional drawing of an artificial tooth. It is a perspective view of a mold material, (a) illustrates the first mold, (b) illustrates the second mold. It is the schematic of a universal testing machine. It is the figure obtained by image | photographing the maintenance hole inner surface with a microscope, (a) is a figure of the maintenance hole inner surface concerning a present Example, (b) is the figure of the maintenance hole inner surface formed with the drill. FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to FIGS. In FIG. 1, for convenience, only some artificial teeth are denoted by reference numerals.
The denture 2 of FIG. 1 has a resin-made denture base 4 and a plurality of artificial teeth 6 (details of each member will be described later). In the present embodiment, when the denture base 4 is molded, the molding material of the denture base 4 is caused to enter the maintenance holes 8 (details will be described later) provided in the artificial tooth 6 (see FIG. 3). In this way, the artificial tooth 6 is attached to the denture base 4 in an embedded state. However, in this type of configuration, it is desirable that the maintenance hole 8 can be formed in the artificial tooth 6 with good performance (for example, excellent attachment stability).
Therefore, in this embodiment, the maintenance hole 8 is formed in the artificial tooth 6 with good performance with the configuration described later. Hereinafter, each configuration will be described in detail.

[Denture base]
The denture base 4 is a member (made of resin) having a shape that can be mounted in the oral cavity, and can be used as a complete denture or a partial denture (see FIG. 1).
For example, the denture base 4 (total denture) of the present embodiment typically has a horseshoe shape, and a plurality of artificial teeth 6 (described later) can be mounted side by side in a horseshoe shape (the mounting method will be described later). In addition, in the denture base (not shown) as a partial denture, it can be set as the shape which makes a part of horseshoe shape, and the multiple or single artificial tooth 6 can be attached.
Here, the type of resin of the denture base 4 is not particularly limited. Examples of this type of resin include acrylic resins, urethane resins, polycarbonate resins, polyester resins (polyethylene terephthalate, polybutylene terephthalate, polycyclohexene terephthalate, etc.), polyolefin resins (polyethylene, polypropylene, etc.), polyamide resins, and polyacetal resins. Further, as this kind of resin, alloys of these various resins, for example, an alloy of acrylic resin and polycarbonate resin can be used.
And the manufacturing method of the denture base 4 can be suitably set with the kind of resin (molding material). For example, the denture base 4 can be manufactured by filling a polymerizable composition (molding material) into a mold and then polymerizing and curing using energy such as heat and light irradiation. Further, after densifying the thermoplastic resin (after forming the molding material), the denture base 4 can be manufactured by injecting into a plaster mold and solidifying by cooling.

[Artificial teeth]
The artificial tooth 6 is a member shaped like a natural tooth (permanent tooth or milk tooth) and has a maintenance hole 8 described later (see FIGS. 2 to 4).
For example, the artificial tooth 6 of the present embodiment can be used as a molar tooth, and has a substantially flat meshing portion 6a and a root portion 6b (see FIG. 2). The artificial tooth 6 is gradually tapered from the meshing portion 6a to the root portion 6b, and includes a tongue side surface 6c (a surface facing the oral cavity), a cheek side surface 6d (a surface facing the oral cavity), and a side surface 6e ( Each of the surfaces that can face other teeth is a free-form surface.

The material of the artificial tooth 6 can be exemplified by metal (alloy), ceramic, or resin. In this embodiment, the resin-made artificial tooth 6 is used in consideration of laser processing described later.
The kind of resin of the artificial tooth 6 is not particularly limited. Examples of this type of resin include acrylic resins, polycarbonate resins, urethane resins, polyester resins (polyethylene terephthalate, polybutylene terephthalate, polycyclohexene terephthalate, etc.), and polyolefin resins (polyethylene, polypropylene, etc.). Further, as this kind of resin, alloys of these various resins, for example, an alloy of acrylic resin and polycarbonate resin can be used. Since the typical artificial tooth 6 is composed of several layers (having a multilayer structure), for example, a plurality of resins such as an acrylic resin and a polycarbonate resin can be used in a layer structure.
Moreover, the manufacturing method of the artificial tooth 6 can be suitably set with the kind of resin. For example, the artificial tooth 6 can be manufactured by filling the polymerizable composition into a mold and then curing it. Further, after the thermoplastic resin is melted by heat, the artificial tooth 6 can be manufactured by injecting it into a plaster mold and cooling and solidifying it.

(Granular material)
In the present embodiment, it is desirable to add particulates to the resin artificial teeth 6 (molding material) in consideration of the formation of the maintenance holes 8 by laser (details will be described later).
In this way, the artificial tooth 6 contains the particulate matter, so that the transpiration of the laser irradiation portion of the artificial tooth 6 is promoted so that the maintenance hole 8 can be performed with good performance (with almost no molten deposit while maintaining an appropriate diameter). ) Can be formed.
The granular material is a particle having an average particle diameter of 1 μm or less (typically in a range of 1 μm to 0.005 μm), and can be formed of at least one of an inorganic pigment and silica. Examples of inorganic pigments include white pigments such as titanium oxide, yellow pigments such as iron oxide, black pigments such as carbon black, and blue pigments such as cobalt aluminate (CoAl ₂ O ₄ ). And in a present Example, while being able to contain either the granule made from an inorganic pigment and the granule made from a silica independently, both can also be contained.
The particle size (primary particle size) of the granular material can be measured, for example, with a transmission electron microscope or a scanning electron microscope. And the average particle diameter is computable by taking a particle size distribution from 500 granular materials.

Then, with respect to the artificial tooth 6 (based on the total weight), 0 to 40% by weight of inorganic pigment particles and 0 to 20% by weight of silica particles in total 0.1% It can be contained in the range of not less than 40% by weight.
Here, if the content of the granular material (made of inorganic pigment or silica) is less than 0.1% by weight, the effect of promoting the transpiration of the artificial tooth 6 (resin) at the time of laser processing becomes remarkable, and the desired maintenance hole 8 is formed. It becomes difficult to form. Further, if the content of the inorganic pigment is 40% by weight or more, the artificial tooth 6 may not be formed (polymerized). Further, when the content of the inorganic pigment is 10% by weight or more, there may be a problem in the color of the artificial tooth (for example, a color extremely different from the color of natural teeth).
Similarly, if the silica content is 20% by weight or more, the artificial tooth 6 may not be formed.
When the content of the granular material is in the range of 0.1 wt% to 20 wt% (more preferably 0.1 wt% to 5 wt%), the desired maintenance hole 8 can be formed and the artificial tooth 6 The strength can be suitably maintained. Further, from the viewpoint of improving the durability of the denture 2 and the strength of the artificial tooth 6, a total of 0 to 20% by weight of inorganic pigment particles and 0 to 10% by weight of silica particles are combined. It is preferable to make it contain in 0.1 to 20 weight%.

(Crosslinking agent)
Furthermore, in this embodiment, it is desirable that the artificial tooth 6 (resin) has a cross-linked structure in consideration of the formation of the maintenance hole 8 by laser (details will be described later). In this way, the desired maintenance hole 8 can be formed with better performance by promoting the transpiration of the laser-irradiated portion of the artificial tooth 6.
The type of the crosslinking agent can be set according to the material (resin) of the artificial tooth 6. For example, in the case of the artificial tooth 6 made of acrylic resin, ethylene glycol dimethacrylate can be used as the crosslinking agent. Depending on the material (resin) of the artificial tooth 6, various crosslinking agents (triethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, 1,10-decanediol dimethacrylate) , Neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, etc.) can be used as appropriate.
The amount of the crosslinking agent added is desirably 0.1 wt% or more and less than 40 wt% based on the total weight of the artificial tooth 6. Here, when the addition amount of the crosslinking agent is less than 0.1% by weight, the effect of promoting the transpiration of the artificial tooth 6 (resin) at the time of laser processing becomes remarkable, and it becomes difficult to form the desired maintenance hole 8. When the amount of the crosslinking agent added is 40% by weight or more, the artificial tooth 6 becomes extremely brittle and easily breaks.
Furthermore, in the present embodiment, the artificial teeth 6 (resin) have a crosslinked structure, and the desired maintenance holes 8 can be suitably formed by adding granular materials.

[Maintenance hole]
The maintenance hole 8 is a through hole that penetrates the artificial tooth 6 in the alignment direction D of the artificial tooth 6 and opens to other teeth (other artificial teeth or natural teeth) so as to face each other (FIGS. 1, 3, and FIG. 4).
In the present embodiment, the inner surface of the maintenance hole 8 is a smooth surface having no cutting trace (see FIG. 7A, the forming method will be described later). Thus, if the inner surface of the maintenance hole 8 is smooth (having no cutting trace), the molding material of the denture base 4 can smoothly enter.
And the maintenance hole 8 is formed in the location which can be embed | buried in the denture base 4, and can typically be formed in the root part 6b.

Here, the cross-sectional shape of the maintenance hole 8 is not particularly limited. For example, by setting the maintenance hole 8 (cross-sectional shape) to a shape (undercut shape) that becomes narrower stepwise or continuously from the meshing portion 6a side to the root portion 6b side, the artificial tooth 6 can be attached. Stability can be improved.
For example, the maintenance hole 8 of the present embodiment has an undercut shape, and has a first part 8a on the meshing part 6a side and a second part 8b on the base part 6b side (see FIG. 4). The first portion 8a (cross-sectional shape) has a substantially rectangular shape that is wide from the inner surface to the outer surface of the artificial tooth 6 (in the thickness direction in the cheek tongue direction) (width dimension W1). The second portion 8b (cross-sectional shape) is a substantially rectangular shape having a narrow width from the inner surface to the outer surface of the artificial tooth 6, and opens to the bottom surface of the artificial tooth 6 while communicating with the first portion 8a (width dimensions W2, W2). <W1).

[Manufacture of artificial teeth (maintenance holes)]
After the artificial tooth 6 is created by an appropriate method (molding, firing, casting, etc.) according to the material, the maintenance hole 8 is formed. At this time, in this example, the maintenance holes 8 were efficiently formed in the resin-made artificial teeth 6 in the following first to third steps.
In this embodiment, as a method for forming the sustain hole 8, formation by laser (described later) is exemplified, but various other forming methods can be adopted. Examples of the method of forming this type of the maintenance hole 8 include a method of forming by thermal action such as contact with a heat source, drilling with a high-pressure water stream or high-pressure air, and insert molding. In insert molding, a mold release agent is applied to a cylindrical member (a member having a shape that follows the outer shape of the maintenance hole 8), and then placed in the mold of the artificial tooth 6. Then, the maintenance hole 8 can be formed by removing the cylindrical material after the artificial tooth 6 is formed. And by each above-mentioned formation method, the inner surface of the maintenance hole 8 can be made into the smooth surface which does not have a cutting trace.

(First step)
In the first step, the mold member 10 can hold the artificial tooth 6 with the sustain hole forming position facing the irradiation direction of the laser beam LB and includes the through-hole portions (12a, 14a) through which the laser beam can pass. Is manufactured (see FIG. 5).
The mold material 10 of the present embodiment has a pair of molds (a first mold 12 and a second mold 14) described later, and can hold the artificial tooth 6 in a sandwiched state. The pair of molds 12 and 14 can be arranged in a face-to-face manner with the artificial tooth 6 sandwiched from the thickness direction, with the center line CL (line perpendicular to the laser irradiation direction) of the side surface 6e of the artificial tooth 6 interposed therebetween.
Here, the forming method of the mold member 10 is not particularly limited, and examples thereof include mold making using silicon using the artificial tooth 6 and trimming based on the three-dimensional data of the artificial tooth 6. In particular, the shape of the maintenance hole 8 can be obtained by milling the mold 10 using the three-dimensional data of the artificial tooth 6 so that the laser irradiation light direction and the penetration direction of the maintenance hole 8 of the artificial tooth 6 are parallel. And the accuracy of the position can be improved.

And the 1st type | mold 12 is a substantially rectangular flat plate material, and has the 1st through-hole part 12a, the 1st arrangement | positioning part 12b, and a pair of assembly | attachment protrusion 12c. The 1st through-hole part 12a is a through-hole of the 1st type | mold 12 center, and opens the formation position of the maintenance hole 8 so that exposure is possible. Moreover, the 1st arrangement | positioning part 12b is a recessed part which shape | molded the one surface side (for example, the tongue side surface 6c side) of the artificial tooth 6, and is formed in the circumference | surroundings of the 1st through-hole part 12a. The pair of assembling protrusions 12 c are portions (cubic shapes) that protrude toward the second mold 14, and can be formed on the edges of the first mold 12, respectively.
Moreover, the 2nd type | mold 14 is a substantially rectangular flat plate material (same dimension as the 1st type | mold 12), and has the 2nd through-hole part 14a, the 2nd arrangement | positioning part 14b, and a pair of assembly hole part 14c. The second through-hole portion 14 a has the same configuration as the first through-hole portion 12 a and is formed at the center of the second mold 14. The second arrangement portion 14b is a recess formed by shaping the other surface side (for example, the cheek side surface 6d side) of the artificial tooth 6 and is formed around the second through-hole portion 14a. The pair of assembly holes 14 c are notches (cubic shapes) into which the assembly protrusions 12 c can be fitted, and can be formed at the edge of the second mold 14.
In this embodiment, both molds 12 and 14 are provided with through-hole portions 14a and 14b, respectively, so that they can be used repeatedly while avoiding damage to each mold due to laser light irradiation.

(Second step)
In the second step, the plurality of mold members 10 are arranged side by side, and the artificial teeth 6 are respectively disposed on the plurality of mold members 10.
At this time, in this embodiment, the plurality of mold members 10 can be arranged on the work table (not shown) at an appropriate interval or at equal intervals. Then, a laser (irradiation device) (not shown) is disposed at a position where it can face each mold 10 and is relatively movable in the direction in which the mold materials 10 are arranged. Examples of the laser include a carbon dioxide laser, a ruby laser, an argon laser, and a semiconductor laser. Among these, a carbon dioxide laser that is suitable for a highly transparent resin is preferable.
Then, before and after the above-described operation, the assembly protrusion 12c is fitted into the assembly hole 14c while the artificial tooth 6 is sandwiched between the first mold 12 and the second mold 14 (the arrangement part of both molds). In this way, the artificial tooth 6 is disposed on each of the plurality of mold members 10, and the artificial tooth 6 portion (the position where the maintenance hole 8 is formed) exposed from each of the through-hole portions 12a and 14a is disposed facing the irradiation point of the laser beam LB. In the present embodiment, the artificial teeth 6 are stably held by the respective mold members 10, whereby the formation positions of the maintenance holes 8 can be more reliably faced in the laser irradiation direction.
Note that different types of artificial teeth 6 can be arranged in each of the plurality of mold members 10, and the same type of artificial teeth 6 can also be arranged.

(Third process)
In the third step, the maintenance holes 8 are formed in the artificial teeth 6 held by the molds 10 while sequentially facing the laser beams to the plurality of molds 10 (see FIGS. 3 to 5).
By forming the maintenance hole 8 using a laser in this way, the inner surface of the maintenance hole 8 can be made a smooth surface without cutting marks (see FIG. 7). In the present embodiment, it is preferable to arrange the plurality of mold members 10 at equal intervals. By doing this, the laser is relatively moved by equal distances (relatively simple operation), so that the maintenance holes are formed with respect to the artificial teeth 6. 8 can be formed efficiently.
Here, the output of the laser is not particularly limited as long as it can penetrate the artificial tooth 6, but in the case of the resin-made artificial tooth 6, the output can typically be set to 0.2 W to 100 W. If the laser output is less than 0.2 W, the artificial tooth 6 may not be penetrated. If the laser output exceeds 100 W, the artificial tooth 6 may be burnt, and this may become a resistance to penetration (flow) of the molding material.

And in this embodiment, the opening area of the maintenance hole 8 (first portion 8a) of the laser beam incident side, the opening area of the maintenance hole 8 (first portion 8a) of the outgoing side, 0.1 mm ² respectively to 10 mm ² It is desirable to set it within the range. By doing so, the molding material of the denture base 4 flows smoothly in the maintenance hole 8 (minimum), and the strength of the artificial tooth 6 can be suitably maintained.
Furthermore, when the opening area of the maintenance hole 8 (first part 8a) on the laser beam incident side is 1, the opening area of the maintenance hole 8 (first part 8a) on the emission side is in the range of 0.6 to 1.4. It is desirable to do. If the ratio of the opening area is out of the above range, the cross-sectional shape of the maintenance hole 8 is greatly changed, which causes a problem in the flow direction of the molding material of the denture base 4 and impairs the product appearance.

(Manufacture of dentures)
1 to 4, when the denture base 4 is molded, the molding material of the denture base 4 is inserted into the maintenance hole 8 of the artificial tooth 6 and attached to the denture base 4 in an embedded state.
At this time, in the present embodiment, the inner surface of the maintenance hole 8 is a smooth surface having no cutting traces, so that the intrusion of the molding material of the denture base 4 can be promoted (with a configuration with excellent mounting stability). it can). For this reason, in this embodiment, when the molding material is solidified in the maintenance hole 8 (by exerting an anchor action), the attachment stability of the artificial tooth 6 to the denture base 4 can be suitably improved.
Further, in this embodiment, the granular material can suppress the stickiness of the artificial tooth 6 at the time of laser irradiation as much as possible to promote transpiration (the extremely small maintenance hole 8 can be formed with good performance). Furthermore, the maintenance hole 8 can be formed with better performance by making the artificial tooth 6 have a crosslinked structure at this time.
As a result, according to the present embodiment, the maintenance hole 8 can be formed in the artificial tooth 6 with good performance. Moreover, in an Example, the base denture 2 which has the above-mentioned artificial tooth 6 (artificial tooth 6 excellent in attachment stability) can be manufactured.

[Test example]
Hereinafter, although 2nd invention and 3rd invention are demonstrated based on a test example, this invention is not limited to a test example.
Example 1
In Example 1, 0.1% by weight of silica particles was added to the main raw materials for artificial teeth (PMMA, MMA, BPO) (see [Table 1] and [Table 2]). These components were kneaded and homogenized, then filled into a mold (10 × 10 × 10 mm) and cured in boiling water for 30 minutes. Thereafter, the product was taken out from the mold, subjected to heat treatment at 120 ° C. for 12 hours, and then returned to room temperature to obtain an artificial tooth (made of acrylic resin) of Example 1. In addition, as a form (mold shape) of the artificial tooth, a form of a central incisor (manufactured by Yamahachi Togaku Kogyo Co., Ltd., trade name: Fuserra Mandible No. 1) was used.

(Example 2)
In this example, 0.1% by weight of titanium oxide (TiO ₂ , inorganic pigment) particles were added to the main raw material of artificial teeth (same type as in Example 1). And the artificial tooth of Example 2 was manufactured on the same conditions as Example 1.

(Example 3)
In this example, 3% by weight of titanium oxide granules and 3% by weight of silica granules were added to the main raw material of artificial teeth (same type as in Example 1). And the artificial tooth of Example 3 was manufactured on the same conditions as Example 1. FIG.

(Example 4)
In this example, 10% by weight of titanium oxide granules and 10% by weight of silica granules were added to the main raw material for artificial teeth (same type as in Example 1). And the artificial tooth of Example 4 was manufactured on the same conditions as Example 1. FIG.

(Example 5)
In this example, 20% by weight of titanium oxide granules was added to the main raw material for artificial teeth (same type as in Example 1). And the artificial tooth of Example 5 was manufactured on the same conditions as Example 1. FIG.

(Example 6)
In this example, 0.1% by weight of ethylene glycol dimethacrylate (EGDMA, cross-linking agent) was added to the main raw material for artificial teeth (same type as in Example 1). And the artificial tooth of Example 6 was manufactured on the same conditions as Example 1. FIG.

(Example 7)
In this example, 5% by weight of EGDMA was added to the main material of artificial teeth (same type as in Example 1). And the artificial tooth of Example 7 was manufactured on the same conditions as Example 1. FIG.

(Example 8)
In this example, 20% by weight of EGDMA was added to the main material of artificial teeth (same type as in Example 1). And the artificial tooth of Example 8 was manufactured on the same conditions as Example 1. FIG.

Example 9
In this example, 3% by weight of titanium oxide particles, 3% by weight of silica particles, and 0.1% by weight of EGDMA were added to the main raw material for artificial teeth (same as in Example 1). . And the artificial tooth of Example 9 was manufactured on the same conditions as Example 1. FIG.

(Example 10)
In this example, 3% by weight of titanium oxide granules, 3% by weight of silica granules, and 5% by weight of EGDMA were added to the main raw material of artificial teeth (same type as in Example 1). And the artificial tooth of Example 10 was manufactured on the same conditions as Example 1. FIG.

(Example 11)
In this example, 3% by weight of titanium oxide granules, 3% by weight of silica granules, and 20% by weight of EGDMA were added to the main raw material of artificial teeth (same type as in Example 1). And the artificial tooth of Example 11 was manufactured on the same conditions as Example 1.

(Example 12)
In this example, 1% by weight of titanium oxide granules and 1% by weight of silica granules were added to the main materials of artificial teeth (bisphenol A, phosgene) ([Table 1] and [Table 4]). See). And the artificial tooth (made of polycarbonate resin) of Example 12 was manufactured on the same conditions as Example 1.

(Comparative Example 1)
In this comparative example, the artificial tooth of the comparative example 1 was manufactured on the same conditions as Example 1 using only the main raw material of artificial tooth (same kind as Example 1) ([Table 1] and [Table 3]). See).

(Comparative Example 2)
In this comparative example, 20% by weight of silica particles was added to the main material of artificial teeth (same type as in Comparative Example 1). An attempt was made to produce an artificial tooth of Comparative Example 2 under the same conditions as in Example 1.

(Comparative Example 3)
In this comparative example, 40% by weight of silica particles was added to the main raw material for artificial teeth (same type as in comparative example 1). An attempt was made to produce the artificial tooth of Comparative Example 3 under the same conditions as in Example 1.

(Comparative Example 4)
In this comparative example, 40% by weight of titanium oxide granules was added to the main raw material of artificial teeth (same type as in comparative example 1). An attempt was made to produce the artificial tooth of Comparative Example 4 under the same conditions as in Example 1.

(Comparative Example 5)
In this comparative example, 3% by weight of titanium oxide granules, 3% by weight of silica granules, and 40% by weight of EGDMA were added to the main material of artificial teeth (same type as in Comparative Example 1). And the artificial tooth of the comparative example 5 was manufactured on the same conditions as Example 1. FIG.

(Comparative Example 6)
In this comparative example, the artificial tooth of Comparative Example 1 was manufactured under the same conditions as in Example 1 using only the main raw material of artificial tooth (same type as in Example 12) ([Table 1] and [Table 4]). See).

[Performance test of maintenance hole (penetration test / adhesion test)]
In this test, maintenance holes were formed in the artificial teeth of each example and the artificial teeth of the comparative example using a carbon dioxide laser (manufactured by Mitsubishi Electric Corporation, model: 806T2-25SRP). The irradiation conditions of the carbon dioxide laser were as follows: incident aperture: 0.4 mm, 850 × 650 (table size), oscillator: Co ₂ laser, rated / peak output: 1.0 kW / 2.5 kW.
And according to the following reference | standard, the performance (penetration precision, the degree of adhesion of a melt) of the maintenance hole in each Example and each comparative example was evaluated. Furthermore, the inner surface of the maintenance hole of the artificial tooth of Example 1 was observed with a shape measurement laser microscope (model number VKX100, manufactured by Keyence Corporation) (see FIG. 7A). As a reference example, a maintenance hole was formed on the artificial tooth of Example 1 using a drill, and the inner surface of the maintenance hole was observed with a shape measurement laser microscope (see FIG. 7B).

(1) Penetration test: In the penetration test, the opening area of the incident-side maintenance hole was set to 0.1256 mm ² (diameter 0.4 mm), and the emission-side opening area of the maintenance hole was measured. And the penetration precision of the through-hole of each Example and each comparative example was evaluated on the following reference | standard.
A: The opening area on the emission side is 0.07065 mm ² (diameter 0.3 mm) or more and 0.19625 mm ² (diameter 0.5 mm) or less.
A: The opening area on the emission side is 0.0314 mm ² (diameter 0.2 mm) or more and less than 0.07065 mm ² (diameter 0.3 mm).
X: The opening area on the emission side is 0 or more and less than 0.0314 mm ² (diameter 0.2 mm).

(2) Adhesion test: It was visually confirmed whether or not the melt adhered to the artificial tooth.
○: No adhesion of melt.
X: Melt adheres.

[Dental fracture load test]
In this test, a compression shear test was performed on the artificial teeth of the examples and comparative examples using a universal testing machine. As a universal testing machine, an electronic universal testing machine (model number: CMT4204, SHENZHEN SANS TESTING MACHINE Co, LTD.) Was used.
At this time, referring to FIG. 6, after the denture base 4 was attached to the base 22, the head 24 was moved downward to press the artificial tooth 6 (head speed 1 mm / min). Under this condition, the load (g) when the artificial tooth 6 was detached or destroyed was measured.
In this test, an acrylic resin denture base 4 was used. As a molding material for the denture base 4, 69.9% by weight of PMMA, 30% by weight of MMA, and 0.1% by weight of BPO were used.
The test results were evaluated according to the following criteria.
A: Breaking load of 7.6 g or more.
○: Breaking load 7.5 g to 6.5 g.
X: Breaking load less than 6.5 g.

[Results and discussion]
[Table 1] shows details of each component of the artificial tooth. [Table 2] to [Table 4] show the compositions and test results of Examples and Comparative Examples as appropriate.

With reference to [Table 3] and [Table 4], in Comparative Examples 1-6, the artificial tooth provided with desired performance could not be manufactured.
For example, in Comparative Example 1, it was found that the performance of the maintenance hole was extremely bad, the breaking load was relatively small, and the strength of the artificial tooth (or the durability of the denture) was inferior. In Comparative Examples 2 to 4, the molding material was not cured, and the artificial teeth could not be produced. In Comparative Example 5, it was found that the breaking load was extremely small and the strength (or durability) was remarkably inferior. In Comparative Example 6, it was found that the performance of the maintenance hole was extremely bad, the breaking load was extremely small, and the strength (or durability) was remarkably inferior.

Unlike this, with reference to [Table 2] and [Table 4], in the artificial teeth of Examples 1 to 12, it is possible to form a maintenance hole excellent in performance, and the breaking load is large and the strength (or durability) is increased. I found it excellent. In particular, in Examples 9 to 11, it was found that maintenance holes having particularly excellent performance can be formed while maintaining a desired strength (or durability).
From the above, it was found that according to each example, the maintenance hole can be formed in the artificial tooth with good performance.

The artificial teeth and the like of the present embodiment are not limited to the above-described embodiments, and can take other various embodiments.
(1) In the present embodiment, an example has been described in which a pair of molds (first mold 12 and second mold 14) described later are provided and the artificial tooth 6 is held in a sandwiched state. In contrast to this, as the mold material, either the first mold or the second mold can be used.
(2) In the present embodiment, the configurations (shape, dimensions, etc.) of artificial teeth and denture bases are illustrated, but the configuration of these members is not intended to be limited. For example, the shape of the artificial tooth can be such that the meshing portion and the base portion are substantially the same shape (a shape that is not tapered) or the base portion is wider. In addition to the main raw material, granule, and crosslinking agent, other components (diluent, thickener, etc.) can be contained as components of the artificial tooth.
(3) Further, in this embodiment, the maintenance hole 8 is a through hole that penetrates the artificial tooth 6 in the alignment direction D of the artificial tooth 6 and opens to face another tooth (other artificial tooth or natural tooth). Illustrated. The penetration direction of the maintenance hole is not limited to this. For example, the maintenance hole can be penetrated in the thickness direction in the buccal tongue direction of the artificial tooth.

2 Denture base 4 Denture base 6 Artificial tooth 8 Maintenance hole 8a First part 8b Second part 10 Mold material 12 First mold 14 Second mold 22 Immediate weight base 24 Head

Claims (5)

An artificial tooth that can be attached to a resin-made denture base, and at the time of molding the denture base, by allowing the molding material of the denture base to enter a maintenance hole provided in the artificial tooth, with respect to the denture base In artificial teeth that can be mounted in an embedded state,
An artificial tooth in which the maintenance hole is a through-hole penetrating the artificial tooth, and an inner surface of the maintenance hole is a smooth surface having no cutting trace. The sustain hole is formed by a laser,
The artificial tooth is made of a resin containing particles having an average particle size of 1 μm or less formed of at least one of an inorganic pigment and silica, and the particles of the inorganic pigment having a weight of 0 wt% or more and less than 40 wt% 2. The artificial tooth according to claim 1, further comprising 0% by weight or more and less than 20% by weight of the silica particles in a total range of 0.1% by weight or more and less than 40% by weight.   The artificial tooth according to claim 2, wherein a crosslinking agent is added in a range of 0.1 wt% or more and less than 40 wt%.   A denture having a plurality of or a single artificial tooth according to any one of claims 1 to 3. A first step of creating a mold material that can hold the artificial tooth in a state in which the maintenance hole forming position faces the irradiation direction of the laser light and includes a through-hole portion through which the laser light can pass,
A second step of arranging a plurality of the mold materials side by side and arranging the artificial teeth on the plurality of mold materials,
4. The method according to claim 1, further comprising a third step of forming the maintenance hole in the artificial tooth held by each mold material while sequentially facing the laser to the plurality of mold materials. Manufacturing method for artificial teeth.