JP2021035401A - Dental post, dental sleeve, and dental abutment construction kit - Google Patents

Abstract

To provide a dental post, a dental sleeve and a dental abutment construction kit, by which an abutment that causes no tooth root fracture resulting from a post, no post breakage, and no detachment from a tooth can be built up in a short time.SOLUTION: A sleeve 20 has openings at both ends, and includes a cylindrical peripheral wall 21 that defines a columnar hollow hole 20x, by which the openings are in communication with each other. The peripheral wall 21 includes a truss structure defining triangular through-holes 20k that are in communication with the hollow hole 20x. A post 10 is a ready-made product formed by covering a center member 12 including a pillar-like shaft with a sheathing member 14, the sheathing member 14 has a columnar or truncated cone-like outer shape that corresponds to a peeso reamer, and the sheathing member 14 has a smaller modulus of elasticity than the center member 12. The post 10 is planted in a post hole 54 formed in a tooth 50 using the peeso reamer, and a dental resin is built up while the post 10 is inserted in the hollow hole 20x of the sleeve 20.SELECTED DRAWING: Figure 3

Description

The present invention relates to a dental post, a dental sleeve and a dental abutment construction kit, and more particularly to a dental post, a dental sleeve and a dental abutment construction kit used for constructing a dental abutment.

Create a foundation that allows you to cover a prosthesis such as a crown or bridge if most of the crown is lost due to tooth decay. This foundation is called an abutment, and making an abutment is called abutment construction. The abutment consists of a core that is placed over the missing tooth and a post that is attached or glued to the post hole of the tooth.

The methods for constructing the abutment include (a) an indirect method of taking a tooth mold and making an abutment on the mold, and (b) a direct method of making an abutment directly on the tooth without taking a mold. And (c) the direct and indirect method of making an abutment by using the tooth itself as a mold.

Conventionally, an abutment having a metal post and a metal core has been used. Such an abutment is constructed by the indirect method.

In recent years, abutments have been constructed by the indirect method, the direct method, or the direct indirect method using fiber posts. For example, a fiber post is planted in a post hole and a composite resin is built around the portion of the fiber post protruding from the post hole to form a core.

In addition, abutment construction using metal wire has been proposed. FIG. 8 is an explanatory diagram of this abutment construction. As shown in FIG. 8, the metal wire used for the clasp wire to be the core rod 4 is sandblasted to roughen the surface, a primer 5 for metal adhesion is applied on the metal wire, and an ultrafast-hardening normal temperature polymerization resin is further applied thereto. 6 is further applied to form a core 7, and the core 7 is used to build and form an abutment 9 with a composite resin 8. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-237209

The abutment with a conventional metal post and metal core is manufactured through complicated processes such as plaster model making from the impression, waxing up on the model, burying, and casting after taking an impression, and it takes time from molding to mounting. .. Therefore, there is a risk that technical fees will be incurred, the number of hospital visits will increase, and bacterial infection will progress in the treated tooth before the abutment is attached at the next visit. In addition, since the elastic modulus of the metal post is much higher than that of the dentin of the tooth, it is likely to cause root fracture.

On the other hand, when a fiber post is used, the time can be shortened. In addition, since the elastic modulus of the fiber post is close to that of the dentin of the tooth, it is less likely to cause root fracture than the metal post. However, the fiber post may break inside the abutment and the abutment may come off the teeth.

Regarding the abutment construction using the metal wire (wire) described in Patent Document 1 (Japanese Unexamined Patent Publication No. 2000-237209), the clasp wire has insufficient bending strength and is easily deformed, broken or detached by the occlusal force. There is a high possibility of separating. In addition, it takes time to build the abutment.

In view of such circumstances, the present invention provides a dental post, a dental sleeve and a dental support capable of constructing an abutment that does not cause root fracture by the post, does not break the post, and does not separate from the tooth in a short time. It intends to provide a stand-up kit.

The present invention provides a dental sleeve configured as follows in order to solve the above problems.

The dental sleeve has openings at both ends and includes a cylindrical peripheral wall that forms a cylindrical hollow hole that communicates between the openings. The peripheral wall includes a truss structure that forms a triangular through hole that communicates with the hollow hole. A dental abutment can be constructed by embedding the dental post in the dental resin together with the dental post with the dental post inserted in the hollow hole.

For example, the portion of the dental post (hereinafter, also simply referred to as “post”) planted in the post hole formed in the tooth, which protrudes from the post hole, is a dental sleeve (hereinafter, also simply referred to as “sleeve”). By building a dental resin (hereinafter, also simply referred to as "resin") so that it is embedded together with the post while being inserted into the hollow hole of the dental abutment (hereinafter, simply referred to as "abutment"). Also called.) To build.

According to the above configuration, the sleeve has a high strength due to the truss structure, and the effect of reinforcing the abutment is high. When a force is applied to the abutment, the sleeve also bears the force, reducing the force on the post. As a result, the force acting on the post is reduced, the root fracture due to the post can be prevented, and the post can be prevented from breaking.

If the sleeve is white or has a color similar to teeth, even if the post is a dark color such as metal, it will not cause aesthetic problems.

Since the force transmitted in the resin constituting the abutment is dispersed by embedding the sleeve, the force acting on the interface between the abutment and the tooth can be reduced. Furthermore, since the sleeve is formed with through holes, there is little air entrainment when building the resin, and it is possible to avoid a decrease in the strength of the abutment due to the entrainment of air and a decrease in the adhesive strength between the abutment and the teeth. It's easy. Therefore, the abutment can be prevented from coming off the teeth.

In addition, since there is little air entrainment, the resin can be built quickly, so that the abutment can be built in a short time.

Therefore, it is possible to construct an abutment in a short time, which does not cause root fracture due to the post, does not break the post, and does not separate from the tooth.

There are various types of truss structures such as house truss, warren truss, platform truss, K truss, diamond truss, king post truss, and fink truss, but the peripheral wall of the sleeve is one type or two or more types of truss. It suffices to include the structure. The elements that make up the truss structure, that is, the elements that form the triangular through holes, may be straight or curved.

Preferably, the outer diameter of one of the openings is smaller than the outer diameter of the other. The hollow hole has a truncated cone shape. The peripheral wall is tapered.

In this case, the effect can be further enhanced by further reinforcing the abutment with the sleeve and further dispersing the force transmitted in the resin constituting the abutment.

In a preferred embodiment, the peripheral wall comprises (i) a first element annularly extending along the outer circumference of the virtual cross section of the hollow hole cut perpendicular to the centerline of the hollow hole, and (ii). A second element extending linearly along the side of the virtual longitudinal section of the hollow hole, including the centerline of the hollow hole, and (iii) clockwise along the virtual peripheral surface of the hollow hole. It includes a third spiral element that travels, and (iv) a fourth spiral element that travels counterclockwise along the virtual peripheral surface of the hollow hole. The three elements forming the one through hole are (a) at least one of the first element and the second element, and (b) at least one of the third element and the fourth element. On the other hand, including.

The present invention also provides a dental post configured as follows in order to solve the above problems.

The dental post is an off-the-shelf dental post, and includes (a) a columnar central member having both ends, and (b) a covering member that covers the central member. One end side of the covering material has a columnar or truncated cone-like outer shape corresponding to the Peasor reamer. The elastic modulus of the covering member is smaller than the elastic modulus of the central member. The one end side of the dressing is planted in a post hole formed in a tooth using the peeso reamer, and the other end side of the dressing protrudes from the post hole and is dental around the covering member. A dental abutment can be constructed by building a resin for use.

According to the above configuration, when a force is applied to the post planted in the post hole, the force is relaxed and dispersed by the covering member and transmitted to the post hole, thereby preventing stress concentration and breaking the root canal. You can avoid inviting occasions.

Since the central member of the post can be configured to have sufficient strength by using a material having an elastic modulus larger than the elastic modulus of the covering member, the post can be prevented from breaking.

Since one end side of the covering member has a columnar or truncated cone shape corresponding to the Peasor reamer forming the post hole, the gap between the one end side of the covering member and the post hole is reduced and strong adhesion is achieved. Force can be gained and, as a result, the post can be prevented from detaching from the post hole.

Since the post is an off-the-shelf product that easily fits into the post hole, it can be planted in a short time.

Therefore, it is possible to construct an abutment in a short time, which does not cause root fracture due to the post, does not break the post, and does not separate from the tooth.

The present invention also provides a dental abutment construction kit configured as follows.

The dental abutment construction kit includes a combination of the above-mentioned dental sleeve and the above-mentioned dental post. In the combination, the minimum inner diameter of the opening and the hollow hole of the dental sleeve is larger than the maximum outer diameter of the dental post.

In this case, the dental post and the dental sleeve do not need to be selected and combined, so that they are easy to use.

According to the present invention, it is possible to construct an abutment in a short time, which does not cause root fracture by the post, does not break the post, and does not separate from the tooth.

FIG. 1 is an explanatory view of a dental post (Example 1). FIG. 2 is an explanatory view of a dental sleeve (Example 1). FIG. 3 is an explanatory diagram of a usage state of the dental post and the dental sleeve (Example 1). FIG. 4 is an explanatory diagram of the procedure for constructing the abutment (Example 1). FIG. 5 is an explanatory diagram of the procedure for constructing the abutment (Example 1). FIG. 6 is an explanatory diagram of the procedure for constructing the abutment (Example 1). FIG. 7 is an explanatory diagram of the procedure for constructing the abutment (Example 1). FIG. 8 is an explanatory view of the abutment construction (conventional example 2).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Example 1> The post 10 and the sleeve 20 of the first embodiment will be described with reference to FIGS. 1 to 7.

FIG. 1 is an explanatory diagram of a post 10. As shown in FIG. 1, the post 10 is covered with a covering member 14 around the central member 12.

The outer shape on the tip 10t side, which is one end of the post 10, that is, the outer shape on the one end side of the covering member 14, is the outer shape corresponding to the Peasor reamer, for example, a columnar shape having the same outer diameter at any position in the axial direction. It has a tapered or truncated cone-shaped outer diameter in which the outer diameter gradually increases from the tip 10t of the post 10 to the base end 10s. The covering member 14 is made of a material having an elastic modulus smaller than that of the central member 12 and having an elastic modulus close to that of teeth, for example, a dental resin.

For the central member 12, a material having a large elastic modulus, for example, metal or ceramics, is used so that sufficient strength can be secured. The central member 12 can be manufactured by a method such as plastic working or powder metallurgy.

The post 10 is an off-the-shelf product and can be manufactured, for example, by insert molding.

The central member 12 is a columnar member arranged concentrically with the center line of the post 10, and has both ends 12s and 12t.

FIG. 2 is an explanatory view of the sleeve 20. As shown in FIG. 2, the sleeve 20 has a cylindrical peripheral wall 21 having openings 20a and 20b at both ends and forming a cylindrical hollow hole 20x communicating between the openings 20a and 20b.

The peripheral wall 21 includes (i) first elements 22a to 22g extending in an annular shape along the outer circumference of the virtual cross section of the hollow hole 20x cut perpendicular to the center line of the hollow hole 20x, and (ii) the hollow hole. The second elements 24a to 24h extending linearly along the side of the virtual vertical section of the hollow hole 20x including the center line of 20x, and (iii) clockwise along the virtual peripheral surface of the hollow hole 20x. It includes a truss structure composed of a traveling spiral third element 26 and (iv) a spiral fourth element 28 traveling counterclockwise along the virtual peripheral surface of the hollow hole 20x.

The first elements 22a to 22g and the second elements 24a to 24h are connected to each other in a grid pattern. The third element 26 and the fourth element 28 are connected to a connecting portion between the first elements 22a to 22g and the second elements 24a to 24h. Further, the third element 26 and the fourth element 28 are connected to each other except for the connecting portion between the first element 22a to 22g and the second element 24a to 24h.

The peripheral wall 21 is a triangle communicating with a hollow hole 20x between one of the first elements 22a to 22g and the second elements 24a to 24h, the third element 26, and the fourth element 28. It is a truss structure in which a through hole 20k is formed.

In addition, in FIG. 2 and FIG. 3 described later, the illustration of the portion visible through the through hole 20k is omitted.

The third element 26 and the fourth element 28 may be configured so as not to be connected to each other except for the connecting portion between the first element 22a to 22g and the second element 24a to 24h. For example, the third element 26 and the fourth element are along the diagonal of one of the pair of diagonal lines of the rectangular region surrounded by the first elements 22a to 22g and the second elements 24a to 24h. Only one of 28 is coupled to the coupling portion of the first element 22a-22g and the second element 24a-24h. In this case, a through hole communicating with the hollow hole 20x between the first element 22a to 22g, the second element 24a to 24h, and any one of the third element 26 and the fourth element 28. Is formed into a truss structure.

In any of the truss structures described above, the three elements forming one through hole are (a) at least one of the first elements 22a to 22g and the second elements 24a to 24h, and (b) the third element. At least one of the element 26 and the fourth element 28 of the above.

The material of each element constituting the truss structure of the peripheral wall 21, the size and shape of the cross section, the number of elements, and the shape of the portion where the elements are connected to each other and the shape in the vicinity thereof can be appropriately selected.

The sleeve 20 can be manufactured by an appropriate method such as casting, powder metallurgy, injection molding using a resin, metal powder injection molding, and a 3D printer.

FIG. 3 is an explanatory view of a usage state of the post 10 and the sleeve 20. As shown in FIG. 3, the post 10 is planted in the post hole 54 of the tooth 50 sealed with the root canal filling material 60, and the post 10 is arranged so as to surround the protruding portion of the post 10. The abutment is constructed by building a dental resin (not shown) so as to embed the sleeve 20 and the sleeve 20.

Next, the procedure for constructing the abutment will be described with reference to FIGS. 4 to 7. 4 to 7 are explanatory views of the procedure for constructing the abutment, and conceptually show a cross section of the tooth 50 cut in the tooth axis direction.

First, as shown in FIG. 4, the apex 52 of the tooth 50 is sealed with the root canal filling material 60, and the post hole 54 is formed using a peeso reamer.

Next, as shown in FIG. 5, the post 10 is planted in the post hole 54. For example, the post 10 corresponding to the last used Peasor reamer for forming the post hole 54 is selected, tried, adjusted as necessary, and then the dental resin cement 30 is applied to the tip 10t side of the post 10. , The tip 10t side of the post 10 is inserted into the post hole 54 and fixed.

Next, as shown in FIG. 6, the sleeve 20 is arranged so that the base end 10s side of the protruding post 10 is inserted into the hollow hole 20x of the sleeve 20, and the dental resin 32 is built. For example, a photocurable or chemically polymerized composite resin 32 for abutment construction is filled and cured to fix the sleeve 20.

Next, as shown in FIG. 7, the dental resin 34 is further built so that the post 10 and the sleeve 20 are embedded, and the abutment 40 is built. For example, the same abutment-building composite resin 34 as the abutment-building composite resin 32 is built and cured. After the predetermined curing time has elapsed, the cured dental resin 34 of the abutment 40 is scraped off to form the abutment teeth, if necessary.

By constructing the abutment 40 by the above procedure, the following effects can be obtained.

That is, when a force is applied to the post 10 planted in the post hole 54, the force is relaxed and dispersed by the covering member 14 and transmitted to the post hole 54, thereby preventing stress concentration and breaking the root canal. You can avoid inviting occasions.

Since the central member 12 of the post 10 can be configured to have sufficient strength by using a material having an elastic modulus larger than the elastic modulus of the covering member 14, the post 10 can be prevented from breaking.

Since one end side of the covering member 14 has a columnar or truncated cone-like outer shape corresponding to the peasor reamer forming the post hole 54, the gap between the one end side of the covering member 14 and the post hole 54 can be reduced. As a result, the post 10 can be prevented from coming off the post hole 54.

The post 10 can be planted in the post hole 54 in a short time, which is an off-the-shelf product that can be easily fitted to the post hole 54.

Since the sleeve 20 has a truss structure, it has high strength and is highly effective in reinforcing the abutment 40. When a force is applied to the abutment 40, the sleeve 20 also bears the force, so that the force borne by the post 10 is reduced. As a result, the force acting on the post 10 is reduced, the root fracture due to the post 10 can be prevented, and the post can be prevented from breaking.

By making the sleeve 20 white or a color similar to teeth, an aesthetic prosthesis can be produced even if the post 10 has a dark color such as a metallic color.

The force transmitted in the resins 32 and 34 constituting the abutment 40 is dispersed by embedding the sleeve 20, and since the sleeve 20 is formed with the through hole 20k, the through hole 20k is formed in the sleeve 20. Is more dispersed than in the case where the abutment 40 is not formed, so that the force acting on the interface between the abutment 40 and the tooth 50 can be reduced. Further, since the through hole 20k is formed in the sleeve 20, there is little air entrainment when the resins 32 and 34 are built, and the strength of the abutment 40 is lowered due to the air entrainment and the abutment 40 and the teeth 50 are adhered to each other. It is easy to avoid a decrease in strength. Therefore, the abutment 40 can be prevented from coming off from the teeth 50.

Further, since the through hole 20k is formed in the sleeve 20, there is little air entrainment when the resins 32 and 34 are built, so that the resins 32 and 34 can be built quickly, so that the abutment 40 can be built. It can be built in a short time.

Therefore, it is possible to construct the abutment 40 in a short time without causing the root fracture by the post 10, the post 10 not breaking, and the tooth 50 not being separated from the tooth 50.

The post 10 and sleeve 20 may be provided as a dental abutment construction kit. For example, the post 10 and the sleeve 20 that are appropriately combined in advance are stored in the same bag to form a dental abutment construction kit. The post 10 and the sleeve 20 are a combination in which the minimum inner diameters of the openings 20a and 20b and the hollow holes 20x of the sleeve 20 are larger than the maximum outer diameter of the post 10. In this case, the post 10 and the sleeve 20 do not need to be selected and combined, so that they are easy to use.

The central member 12 is preferably completely covered by the covering member 14, but it may be covered at least on the tip 10t side of the post 10. This is because root fracture can be avoided. A configuration is also possible in which the central member 12 is exposed from the covering member 14 on the base end 10s side of the post 10.

Since the post 10 is an off-the-shelf product, it is easy to form an axisymmetric structure with high accuracy. An axisymmetric configuration is preferable because it can evenly relax the stress circumference and prevent root fracture. However, it is also possible that the center line of the central member 12 and the center line of the covering member 14 do not match.

A cylindrical member having a truss structure such as the sleeve 20 of the first embodiment may be used for the central member 12 of the post 10. In this case, the covering member also enters the inside of the central member through the through hole of the truss structure, and it is easy to prevent the central member and the covering member from peeling off, and the integrity of the post is improved.

<Summary> As described above, by using the post and sleeve of the present invention, it is possible to construct an abutment in a short time without causing root fracture by the post, the post does not break, and the abutment does not come off from the tooth. ..

The present invention is not limited to the above embodiment, and can be implemented with various modifications.

For example, the post and sleeve of the present invention can be used not only for abutment construction by a direct method but also for abutment construction by an indirect method or a direct indirect method. It is also possible to construct the abutment using only one of the post and the sleeve of the present invention.

10 posts (dental posts)
12b Head 14 Covering member 20 Sleeve (dental sleeve)
20a, 20b Opening 20k Through hole 20x Hollow hole 21 Peripheral wall 22a-22g First element 24a-24h Second element 26 Third element 28 Fourth element 32,34 Resin (dental cash register)
40 abutment (dental abutment)
50 teeth 54 post holes

Claims (5)

It has openings at both ends and has a cylindrical peripheral wall that forms a cylindrical hollow hole that communicates between the openings.
The peripheral wall includes a truss structure forming a triangular through hole communicating with the hollow hole.
A dental sleeve, characterized in that a dental abutment can be constructed by embedding a dental post in a dental resin together with the dental post in a state where the dental post is inserted into the hollow hole. The outer diameter of one of the openings is smaller than the outer diameter of the other
The hollow hole has a truncated cone shape and has a truncated cone shape.
The dental sleeve according to claim 1, wherein the peripheral wall is tapered. The peripheral wall
A first element that is annularly extending along the outer circumference of the virtual cross section of the hollow hole, which is cut perpendicular to the center line of the hollow hole.
A second element that extends linearly along the side of the virtual vertical section of the hollow hole, including the center line of the hollow hole.
A spiral third element that travels clockwise along the virtual peripheral surface of the hollow hole,
A spiral fourth element that travels counterclockwise along the virtual peripheral surface of the hollow hole,
Including
The three elements forming the one through hole include at least one of the first element and the second element, and at least one of the third element and the fourth element. The dental sleeve according to claim 1 or 2. Off-the-shelf dental post
A central member including a columnar shaft having both ends,
A covering member that covers the central member and
With
One end side of the covering material has a columnar or truncated cone-like outer shape corresponding to the Peasor reamer.
The elastic modulus of the covering member is smaller than the elastic modulus of the central member.
The one end side of the covering material is planted in a post hole formed in a tooth using the peeso reamer, and the other end side of the covering material protrudes from the post hole and is dental around the covering member. A dental post characterized in that a dental abutment can be constructed by building a resin for use. The dental sleeve according to any one of claims 1 to 3 and
The dental post according to claim 4 and
With a combination of
A kit for constructing a dental abutment, wherein in the combination, the minimum inner diameter of the opening and the hollow hole of the dental sleeve is larger than the maximum outer diameter of the dental post.

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