JP6727116B2 - Root canal treatment tooth model, enclosure, tooth model - Google Patents

Description

The present invention relates to a tooth model for root canal treatment, an enclosing member, and a tooth model used in, for example, a practice of root canal treatment.

Root canal treatment in the field of dentistry is the treatment of root canals where the pulp is infected with bacteria and caused inflammation, and after the root canal is cut and the damaged pulp is carefully removed, the root canal is carefully examined. It is a sterilizing and terminating treatment in which a filling material is filled into a root canal that has been cut to prevent re-infection.

In this root canal treatment, if the damaged pulp is not removed, inflammation or the like will recur. Therefore, it is necessary to surely cut the root canal to remove the pulp. On the other hand, if the root canal is cut too much, a cutting tool such as a reamer or a file may penetrate the apex and damage the periodontal ligament. As described above, the root canal treatment requires a high level of skill, and in order to acquire such a technique, in practice of dentistry, a practice of cutting a pseudo root canal provided in a tooth model may be performed.

Also, for example, when a dentist purchases a cutting tool such as a reamer or a file used for root canal treatment, or a cutting tool such as a root canal cutting hand piece equipped with the cutting tool, the dentist may use the cutting tool or the hand piece. There is a case in which a curved pseudo root canal provided on a tooth model is actually cut by using, and the usability, performance, accuracy, etc. of a cutting tool or a handpiece are examined.

The tooth model conventionally used to practice such root canal treatment and to check the comfort, performance, accuracy, etc. of cutting tools and handpieces is made entirely of transparent material and has a root canal in the tooth. Although a curved pseudo root canal is provided inside, the shape of the pseudo root canal and the extending direction can be seen from the outside because the body is transparent, so the root canal can be expanded along the root canal. There is a drawback that the operator intentionally makes corrections when there is no such thing or when the cutting tool breaks through the apex, and was not suitable for practicing root canal cutting and checking the accuracy of the cutting tool. ..

On the other hand, for example, in the tooth model for root canal treatment disclosed in Patent Document 1, a tooth model partially provided with a pseudo root canal imitating a root canal in a tooth is made of a transparent material. Is fixed to the tooth model holding part that imitates the dental arch-shaped gingiva part surrounding the tooth model made of a transparent material, and is made of the transparent material of the tooth model. It is said that it is possible to grasp the movement and position of the cutting tool in the pseudo root canal with a camera equipped to image the side.

However, the tooth model for root canal treatment cannot remove the tooth model from the tooth model holding part, and it is necessary to evaluate the cut pseudo root canal unless the tooth model is reflected by the camera. Since the camera is required, there is a problem that it is difficult to confirm the cutting status of the pseudo root canal.

JP, 2012-29755, A

In view of the above problems, the present invention can prevent the visual observation of the bending condition and the direction of the pseudo root canal at the time of cutting the pseudo root canal, and can easily and accurately evaluate the pseudo root canal for root canal treatment. It is an object to provide a tooth model, a surrounding member, and a tooth model.

This invention is formed of a transparent material, a tooth model in which a pseudo root canal imitating a root canal of a tooth is provided, and an opaque material, and at least a lower side surface of the tooth model. A detachable enclosed enclosing member, the enclosing member is provided with an accommodating portion for accommodating the tooth model, and the enclosing member and the tooth model are made of a non-conductive material. The model is provided with a through-pore penetrating from the root apex portion of the pseudo root canal to the outside, and in the stored state in which the tooth model is stored in the storage section, through the through-pore from the outside of the enclosure member. It is a tooth model for root canal treatment provided with a root canal communicating portion communicating with the pseudo root canal .
The above-mentioned transparent material refers to a material having transparency such that the shape of the pseudo root canal provided inside can be seen through, and includes, for example, a semitransparent material in which the shape of the pseudo root canal is seen through. ..

The surrounding member includes, for example, a storage case that can store the tooth model and a thin-walled thin body that can be attached to the lower side surface of the tooth model.
The term "removable" includes not only the case where the surrounding member is replaceable from the tooth model but also the case where the surrounding member is not replaceable. That is, it includes not only the case where the enclosure member can be reused but also the case where the enclosure member cannot be reused.

The surrounding means a state in which the tooth model is surrounded by the surrounding member so that the surrounding member is slidable with respect to the tooth model such that the surrounding space is slidable, or a whole or a part of a lower side surface of the tooth model. In addition, any state in which the surrounding member is tightly enclosed is included.

According to the present invention, it is possible to prevent the bending condition and the direction of the pseudo root canal from being visually observed at the time of cutting the pseudo root canal, and to evaluate the pseudo root canal that is simply and accurately cut.
In detail, since at least the lower side surface of the tooth model can be covered by the surrounding member, it is possible to prevent visually recognizing the bending condition, the direction, the shape, etc. of the pseudo root canal, and it is practical The pseudo root canal can be cut in a close state. Further, since the tooth model removed from the surrounding member is transparent, the cutting situation of the pseudo root canal after cutting can be evaluated easily and easily.

Furthermore, since the tooth model for root canal treatment has a simple structure such as the tooth model and the surrounding member, a space for cutting the pseudo root canal using the tooth model for root canal treatment is required. First, the pseudo root canal can be cut without considering the location and the cutting status of the cut pseudo root canal can be confirmed.

Further, since the enclosing member is provided with the accommodating portion for accommodating the tooth model, the lower side surface of the tooth model can be enclosed by the enclosing member by surely accommodating the tooth model in the enclosing member. Therefore, the shape of the pseudo root canal can be covered with the surrounding member.

Furthermore, the surrounding member and the tooth model are made of a non-conductive material, and the tooth model is provided with through pores penetrating from the apex portion of the pseudo root canal to the outside, and the tooth model is stored in the housing. In the stored state stored in the portion, since a root canal communicating portion that communicates with the pseudo root canal from the outside of the surrounding member via the through pore is provided, for example, from the tip of the cutting tool to the pseudo root canal. The distance to the apex can be measured with an electric root canal length measuring device.

More specifically, in the actual root canal treatment, the root canal length is measured by measuring the impedance value between the root canal to be cut and the oral cavity, so that the tip of the cutting tool reaches the apex of the root canal. You can judge whether or not. In the present invention, the enclosing member and the tooth model are made of a non-conductive material, and the pseudo root canal and the root canal communicating portion are communicated via the through pores, for example, By filling the communicating portion with a conductive liquid such as physiological saline, the electrical connection between the pseudo root canal and the root canal communicating portion can be secured.

Thereby, the impedance value from the tip of the cutting tool to the root apex of the pseudo root canal can be measured, and it can be determined whether or not the tip of the cutting tool reaches the root apex of the pseudo root canal. Therefore, the distance from the root canal opening to the root apex of the pseudo root canal can be measured.

Further, as an aspect of the present invention, the tooth model may be provided with a plurality of the pseudo root canals having different curved shapes.
According to the present invention, a plurality of pseudo root canals having various curved shapes can be cut by using one tooth model for root canal treatment, so that it is possible to efficiently learn how to use a cutting tool or a handpiece. Further, since the pseudo root canal having various curved shapes can be cut with a cutting tool or a handpiece, the usability, performance, accuracy, etc. of the cutting tool or the handpiece with respect to various curved shapes can be evaluated.

Further, as an aspect of the present invention, a bottomed groove portion that communicates with the pseudo root canal via the through pore may be provided on a side surface of the tooth model, and the groove portion may function as the root canal communication portion.
Further, according to the present invention, a pseudo root canal which is made of a non-conductive material and imitates a root canal of a tooth is provided inside, and at least a lower side surface thereof is detachably surrounded by an enclosing member having a storage part. The root canal is provided with a through-hole penetrating from the root apex portion to the outside, and in a side face, in a housed state housed in the housing part, has a bottomed bottom which communicates with the pseudo root canal through the through-hole. It may be a tooth model provided with a groove.

Further, as an aspect of the present invention, a recess may be provided in the surrounding member between the tooth model housed in the housing, and the recess may function as the root canal communicating portion.
The recess includes a case where the recess is provided in one or both of the storage portion or the surrounding member forming the storage portion.

According to these inventions, for example, a substance having conductivity such as physiological saline or tap water can be stored in the groove portion or the recess portion, so that the pseudo root canal and the groove portion are surely provided through the through pores. It can be conducted, and the impedance value from the tip of the cutting tool to the root apex of the pseudo root canal can be measured. Therefore, the distance from the root canal to the root apex of the pseudo root canal can be measured.

The conductive substance that can be stored in the groove and the recess includes gel-like substances as well as conductive liquids such as physiological saline.

Further, as an aspect of the present invention, a liquid having conductivity and capable of measuring the root canal length of the pseudo root canal and the root canal communicating portion may be stored in the recess through the through pore.
The above-mentioned "storing a liquid capable of measuring the root canal length" means storing the liquid in the pseudo root canal and the root canal communicating portion so that the root canal length of the pseudo root canal can be measured. That is, it means that the above-mentioned conductive liquid is stored so as to electrically connect the pseudo root canal and the root canal communicating portion.

According to the present invention, the pseudo root canal can be electrically connected to the recess by storing the conductive liquid in the recess. Thereby, the impedance value between the cutting tool and the root apex of the pseudo root canal can be measured, and the distance from the root canal opening to the root apex of the pseudo root canal can be measured.

Further, as an aspect of the present invention, the root canal communicating portion may be formed of a conductive root canal communicating portion having conductivity.
According to this invention, since one electrode of the root canal length measuring device is connected to the conductive root canal communicating portion, the impedance value between the cutting tool and the apex of the pseudo root canal can be measured, The distance from the root canal opening to the root apex of the pseudo root canal can be measured.

Moreover, as an aspect of the present invention, a conductive root canal conductive portion may be provided inside the pseudo root canal.
According to the present invention, since the conductivity in the pseudo root canal can be secured, the impedance value between the cutting tool and the root apex of the pseudo root canal is measured, and the root canal to the root apex of the pseudo root canal is measured. Can measure distance.

In addition, when the pseudo root canal and the root canal communicating portion are configured with a conductive part in the root canal having conductivity and the conductive root canal communicating part, respectively, the cutting is performed without using any liquid such as physiological saline. The impedance value between the tool and the apex of the pseudo root canal can be measured. Therefore, the efficiency of preparation and cleaning can be improved without worrying about the liquid spilling.

Furthermore, by filling the root canal communication portion and the inside of the pseudo root canal with a conductive substance, it is possible to more reliably ensure conduction between the root canal communication portion and the inside of the pseudo root canal, so that it is more reliable. In addition, the impedance value from the tip of the cutting tool to the root apex of the pseudo root canal can be accurately measured. Therefore, the distance from the root canal opening to the root apex of the pseudo root canal can be measured more accurately.

Further, as an aspect of the present invention, a fixing portion for fixing the tooth model stored in the storage portion may be provided.
According to the present invention, since the tooth model stored in the storage section can be fixed to the surrounding member, it is possible that the tooth model is inadvertently disengaged from the surrounding member or displaced during cutting of the pseudo root canal. It can be prevented. In other words, since it is possible to prevent the tooth model from moving with respect to the surrounding member during cutting of the pseudo root canal, it is possible to properly evaluate the technique of root canal treatment and the accuracy of the cutting tool.

In addition, as an aspect of the present invention, a conductive member that is made of a conductive material and that enables electrical connection between the pseudo root canal and the outside through the through pores is provided. You may make it function as the said fixed part.

To enable electrical connection between the pseudo root canal and the outside through the through-pores described above means that the conductive member is brought into contact with the root canal communicating portion having conductivity, so that This includes a case where the pseudo root canal is electrically connected to the outside through a hole, and a case where the conductive member is brought into direct contact with the through pore to electrically connect the pseudo root canal and the outside.

According to the present invention, since the conductive member is provided outside the tooth model for root canal treatment, one of the electrodes of the root canal length measuring device can be reliably connected to the conductive member. Thereby, since one of the electrodes of the root canal length measuring device is electrically connected to the pseudo root canal via the conductive member, the apex of the pseudo root canal and the cutting tool are electrically connected by using the conductive member. The impedance value with the tip can be measured.
Further, since the fixing portion and the conductive member are integrally formed, the efficiency of the assembling work can be improved and the number of parts can be reduced.

Further, as a mode of the present invention, a plurality of tooth models may be replaceable with respect to one enclosing member.
According to the present invention, since the tooth model can be replaced with respect to the surrounding member, only the tooth model obtained by cutting the pseudo root canal can be disposable. That is, since only the tooth model can be replaced, it is not necessary to generate unnecessary waste, and the cost can be reduced.

Further, the present invention is formed of a transparent material, a tooth model in which a pseudo root canal imitating a root canal of a tooth is provided, and an opaque material, and at least a lower side surface of the tooth model. And a detachably enclosed enclosing member, and the enclosing member is formed of a thin film or thin-walled thin body, and is attachable to at least the lower side surface of the tooth model . It is characterized by being a tooth model for root canal treatment.

In addition, the present invention is a thin root-shaped thin film formed of an opaque material that removably surrounds at least a lower side surface of a tooth model formed of a transparent material, in which a pseudo root canal imitating a root canal of a tooth is provided. Alternatively, it is characterized in that it is an enclosing member configured to be attached to at least the lower side surface of the tooth model while being formed of a thin thin body.

According to this invention, the bending condition, direction, shape, and the like of the pseudo root canal can be covered by simply attaching the surrounding member to the lower side surface of the tooth model, and the pseudo member can be removed by simply removing the surrounding member. The cutting condition of the root canal can be evaluated.

According to the present invention, a tooth model for root canal treatment and an enclosing member which can prevent visual observation of the bending condition and the direction of the pseudo root canal at the time of cutting the pseudo root canal and can evaluate the pseudo root canal cut easily and accurately , And a tooth model can be provided.

The schematic perspective view of the tooth model for root canal treatment. The schematic exploded perspective view of the tooth model for root canal treatment. Explanatory drawing of the tooth model for root canal treatment in the state which accommodated the tooth model in the storage case. Explanatory drawing of root canal length measurement in the tooth model for root canal treatment. The schematic perspective view of the tooth model of other embodiment. Explanatory drawing of the tooth model of other embodiment. Explanatory drawing of the tooth model for root canal treatment of other embodiment. Explanatory drawing of the tooth model for root canal treatment of other embodiment. Explanatory drawing of the tooth model for root canal treatment of other embodiment. Explanatory drawing of the tooth model for root canal treatment of other embodiment.

Hereinafter, the tooth model 1 for root canal treatment will be described with reference to FIGS. 1 to 4.
1 shows a schematic perspective view of a root canal treatment tooth model 1, FIG. 2 shows a schematic exploded perspective view of a root canal treatment tooth model 1, and FIG. 3 shows a tooth model constituting the root canal treatment tooth model 1. 2 shows an explanatory diagram of a state in which 2 is stored in the storage case 3, and FIG. 4 shows an explanatory diagram of root canal length measurement using the tooth model 1 for root canal treatment.

1 and 2 show the inside of a tooth model 2 made of a transparent material with a broken line, and FIG. 2 is a schematic perspective view of a tooth model 2 and a storage case 3 that make up the tooth model 1 for root canal treatment, and The enlarged view which expanded the alpha part which is the vicinity of the through-pore 24 for clarifying the through-pore 24 is shown. 3 will be described in detail, FIG. 3A shows a plan view of the tooth model 1 for root canal treatment, and FIG. 3B shows AA of the tooth model 1 for root canal treatment in FIG. 3A. A sectional view taken along the arrow is shown.

As shown in FIG. 1, the root canal treatment tooth model 1 is configured such that a tooth model 2 and a storage case 3 that can store the tooth model 2 are separable from each other.
As shown in FIG. 2, the tooth model 2 has a rectangular parallelepiped tooth model body 21 having a square bottom surface, a groove portion 22 formed on a side surface of the tooth model body 21, and a tooth model body 21 that is curved inside. It is composed of a pseudo root canal 23 formed as described above, and a through pore 24 that connects the tip portion of the pseudo root canal 23 and the groove 22.

The tooth model body 21 is a rectangular parallelepiped prism body made of a non-conductive transparent acrylic resin, and is processed to have hardness similar to that of dentin.
The material forming the tooth model body 21 is not limited to an acrylic resin as long as it is a transparent material, and may be an epoxy resin or a polycarbonate resin, for example, and a transparent ceramic. May be. In other words, the material forming the tooth model body 21 may be a polymer that is a transparent solid at room temperature, or an inorganic compound such as a transparent ceramic.

The groove portion 22 is a groove provided along the longitudinal direction from the upper surface of the tooth model body 21, and the through hole 24 of the curved pseudo root canal 23 of the four side surfaces of the tooth model body 21 opens. It is formed on one side. More specifically, the groove portion 22 is a hollow in which the central portion of one surface of the tooth model main body 21 is depressed in a semicircular shape, and the length along the longitudinal direction is the height of the tooth model main body 21 (the length in the longitudinal direction). It is about two-thirds. Then, the through pores 24 are open to the groove portion 22.

In other words, the groove portion 22 is a semi-cylindrical bottomed groove formed on the side surface of the tooth model body 21.
The shape of the groove portion 22 does not have to be a semi-cylindrical shape, and may be, for example, a rectangular pillar shape that is recessed in a rectangular shape, or a triangular pillar shape that is recessed in a triangular shape.

As shown in FIGS. 2 and 3B, the pseudo root canal 23 is a tubular through hole that penetrates from the upper surface of the tooth model body 21 to the inside. More specifically, the pseudo root canal 23 extends downward in the longitudinal direction from the central portion of the upper surface of the tooth model body 21, and the distal end side is curved toward the groove 22.

The pseudo root canal 23 having such a shape has a pseudo root canal opening 231 provided on the upper surface of the tooth model body 21, and a tubular root canal body 232 extending downward with the pseudo root canal opening 231 as one end. It is composed of a root apex 233 forming the other end of the root canal body 232. The root canal body 232 is formed to have a diameter smaller than that of the cutting tool 100 for cutting the root canal, and also becomes smaller toward the root apex 233.

The through pores 24 are fine through holes that penetrate the apex 233 and the groove portion 22.

The tooth model 2 having such a configuration is manufactured by excavating the pseudo root canal 23 by injection molding so that the side surface of the rectangular parallelepiped made of acrylic resin is cut and the groove portion 22 is formed, but this manufacturing method is not always required. It does not have to be provided, and may be manufactured by using, for example, a 3D printer or by cutting molding.

Next, the storage case 3 that can store the tooth model 2 will be described with reference to FIGS. 2 and 3.
The storage case 3 corresponding to the enclosing member has a case body 31 formed in a cylindrical shape, a storage recessed portion 32 provided in a central portion of the upper surface of the case body 31, and a recessed portion radially outward at an upper end portion of the storage recessed portion 32. It is composed of a water supply portion 33 formed without any side, a side surface through hole 34 provided on a side surface of the case body 31, and a conductive fixing member 35 having conductivity protruding radially outward from the side surface through hole 34. ..

The case main body 31 is a cylindrical columnar body made of a non-conductive and opaque material, and the tooth model 2 is recessed in the central portion of the upper surface downward by a predetermined length. A storage concave portion 32 that can be stored is provided.

As shown in FIGS. 3(a) and 3(b), the storage recess 32 has a storage part 321 for fitting and storing the tooth model 2 and a recess part slightly enlarged from the storage part 321 in plan view. 322 and a taper portion 323 formed above the recess 322 in the longitudinal direction are integrally configured.

The storage portion 321 is a rectangular parallelepiped recess having a square bottom surface formed in substantially the same shape as the tooth model body 21, and the depth from the upper surface of the case body 31 is equal to the length in the longitudinal direction of the tooth model body 21. It is about 9/10. That is, as shown in FIG. 3B, the lower part of the tooth model 2 is covered by the storage case 3 in a state where the tooth model 2 is stored in the storage case 3, but the upper end side of the tooth model 2 is stored in the storage case. It will be projected from 3.

As shown in FIGS. 3A and 3B, the concave portion 322 formed on the outer side of the storage portion 321 has a square bottom surface with a predetermined gap widened outside the square of the storage portion 321. It is a rectangular parallelepiped recess having a depth shallower than that of the storage portion 321.

The taper portion 323 formed on the upper end of the recess 322 is a taper surface that enters inward as it goes downward from the upper surface.
As described above, the storage recess 32, which is integrally formed by the storage unit 321, the recess 322, and the taper unit 323, has two rectangular parallelepiped dents each having a square shape in plan view overlapped from the upper surface of the case body 31 downward. Is a stepped concave portion, and the upper surface side is tapered downward toward the inside.

On one side of the tapered portion 323 that is formed in a square shape in a plan view, a water supply portion 33 that is recessed in a semicircular shape radially outward is formed. The water supply portion 33 has a taper shape that is radially inward as it goes downward in the longitudinal direction, and the lower end of the tapered surface intersects the upper end of the recess 322.

The side surface through hole 34 is a tubular through hole that penetrates the side surface of the case body 31 provided in the direction in which the water supply portion 33 projects. In other words, the side surface through hole 34 is a tubular through hole that passes through the storage recess 32 and the outside, and a spiral groove (not shown) is formed on the inner wall surface. The side surface through hole 34 is provided substantially at the center in the longitudinal direction of the case body 31.

The conductive fixing member 35 is a columnar rod-shaped body that is inserted into the side surface through hole 34, and is provided inside the columnar conductive column body 351 and the conductive column body 351 while being inserted into the side surface through hole 34. The tip contact portion 352 and the fixing operation portion 353 provided on the radially outer side of the conductive column body 351.

The conductive columnar body 351 is a conductive metal columnar body, and a spiral convex portion that is screwed into the spiral groove formed in the side surface through hole 34 is provided on the surface (not shown). ). Incidentally. The conductive pillar 351 is not necessarily made of metal, and may be an inorganic compound such as ceramic as long as it has conductivity.

The tip contact portion 352 is a tip portion (diameter inner side) of the conductive column 351 and has a truncated cone shape slightly tapered than the conductive column 351.
The fixing operation portion 353 is a columnar body integrally assembled to the other end side of the conductive column body 351 and has a diameter larger than that of the conductive column body 351 and is made of a non-conductive member.

In this conductive fixing member 35, by rotating the fixing operation portion 353 clockwise with the central axis of the conductive column body 351 as a rotation axis, the spiral convex portion provided on the conductive column body 351 has the side surface through hole 34. It is configured to be screwed into the groove and move toward the inner diameter side.

That is, the conductive fixing member 35 is screwed into the side surface through hole 34 having a screw hole that penetrates the side surface of the case body 31 of the storage case 3 and reaches the storage recess 32, and is adjustable in the front-back direction. The tooth model 2 is stored in the storage recess 32, and the tooth model 2 is fixed in the storage recess 32 by screwing the tooth model 2 into the storage recess 32 with a screw portion formed at the end of the conductive fixing member 35. When the tooth model 2 is separated from the storage recess 32, the tooth model 2 can be detached from the storage recess 32 by loosening the screw formed on the end of the conductive fixing member 35.

The storage case 3 configured in this manner can store and fix the tooth model 2. Specifically, since the storage portion 321 forming the storage recess 32 is a groove having the same shape as the tooth model 2, the tooth model 2 can be stored by inserting it into the storage recess 32. Since the taper portion 323 is formed in a taper shape, the tooth model 2 can be easily inserted into the storage recess 32 by being guided by the taper portion 323.

Next, by rotating the fixing operation portion 353 clockwise, the conductive column body 351 is inserted inside the case body 31, the tip contact portion 352 comes into pressure contact with the groove portion 22, and the tooth model 2 is stored in the storage case 3. Fixed to.
In this embodiment, as shown in FIGS. 1 and 3, the tooth model 2 is housed in the housing case 3 so that the groove portion 22 and the water supply portion 33 face each other. You can store it in.

In the state where the tooth model 2 is stored in the storage case 3, the tooth model 2 is surrounded by the case body 31 made of an opaque material, so that the shape and bending direction of the pseudo root canal 23 are externally determined. I can't see it. Therefore, the pseudo root canal 23 can be cut using the cutting tool 100 in a state where it cannot be visually observed.

Next, a method for measuring the distance between the apex 233 and the cutting tool 100 using the tooth model 1 for root canal treatment will be described with reference to FIG.
First, the physiological saline S having conductivity is poured into the tooth model 1 for root canal treatment in which the tooth model 2 is housed in the housing case 3 from the water supply unit 33 and the pseudo root canal opening 231. Here, since the storage recess 32 and the groove 22 are formed in the shape of a bottomed groove, the poured physiological saline S will be collected in the storage recess 32, the groove 22 and the pseudo root canal 23 (see FIG. 4). ). In addition, a small amount of physiological saline S flows into the root apex portion of the pseudo root canal 23 through the fine through holes 24, which are fine through holes, and the pseudo root canal 23 and the groove portion 22 are electrically connected. In this state, the tip contact portion 352 is located inside the physiological saline solution S.

Next, by connecting one of the electrodes of the root canal measuring device to the conductive pillar 351 exposed to the outside of the case body 31 and connecting the other of the electrodes of the root canal measuring device to the cutting tool 100, Since the electrodes of the length measuring device are electrically connected to each other to form a circuit, the impedance value between the tip of the cutting tool 100 and the apex 233 is measured to determine the distance between the pseudo root canal 231 and the apex 233. Can be measured.
In this embodiment, the impedance value is adjusted so that the impedance value when the tip of the cutting tool 100 comes closest to the root apex 233 is 6.5 kΩ, and the root value is adjusted in a state close to the actual root canal treatment. Can measure pipe length.

The root canal treatment tooth model 1 having such a configuration does not necessarily need to accommodate the tooth model 2 in the storage case 3, and for example, the tooth model 2x having a different configuration from the tooth model 2 illustrated in FIG. The tooth model 1x for root canal treatment may be housed in.
Hereinafter, the tooth model 2x will be described with reference to FIG.

In addition, among the configurations of the tooth model 2x described below, configurations similar to those of the tooth model 2 described above are denoted by the same reference numerals, and description thereof will be omitted.
Here, FIG. 5 shows a schematic perspective view of the tooth model 2x, and the inside of the tooth model 2 made of a transparent material is indicated by a broken line.

Like the tooth model 2, the tooth model 2x is formed inside the tooth model body 21 and a tooth model body 21 having a rectangular parallelepiped shape having a square bottom surface, a groove portion 22 formed on a side surface of the tooth model body 21. It is composed of three pseudo root canals 23x and a through hole 24x through which the tip portion of the pseudo root canal 23x and the groove 22 are inserted.

The groove portion 22 in the tooth model 2x is formed on all side surfaces forming the tooth model body 21.
Further, three pseudo root canal 23x of the tooth model 2x are formed, root canal body 232x as periapical 233x is directed into the groove 22 of, respectively it is curved, and each apical 233x is and through grooves 2 2 and communicates via a through hole 24 x. The three root canal bodies 232x formed inside the tooth model body 21 have different curved shapes.

Since such a tooth model 2x is based on the tooth model body 21 having the same shape as the tooth model 2, the tooth model 2x provided with the pseudo root canal 23x having a plurality of different curved shapes is stored in the storage case 3. can do.

Further, as the configuration of the tooth model 1 for root canal treatment, the tooth model 2 may be a tooth model 2y in which a conductive film 40 is attached to the groove portion 22 as shown in FIG.
Hereinafter, the tooth model 2y will be described with reference to FIG. Similar to the description of the tooth model 2x, of the configurations of the tooth model 2y described below, the same configurations as those of the tooth model 2 described above are denoted by the same reference numerals and the description thereof will be omitted.

Here, FIG. 6 shows an explanatory view of the tooth model 2y, more specifically, FIG. 6(a) shows a schematic perspective view of the tooth model 2y stored in the storage case 3, and FIG. 6(b) shows FIG. The BB arrow sectional drawing of the tooth model 2y stored in the storage case 3 in a) is shown. In addition, in FIG. 6A, the inside of the tooth model 2y made of a transparent material is shown by a broken line.

As shown in FIGS. 6(a) and 6(b), the tooth model 2x has a rectangular parallelepiped tooth model body 21 having a square bottom surface, and a groove portion 22 formed on a side surface of the tooth model body 21. A pseudo root canal 23 formed substantially in the center of the tooth model body 21, a through pore 24 through which the tip portion of the pseudo root canal 23 and the groove 22 are inserted, and a conductive film 40 attached to the groove bottom of the groove 22. It consists of and.

The conductive film 40 is a thin film having conductivity, is attached along the groove bottom of the groove portion 22, and is configured to be conductive with the pseudo root canal 23 via the through pore 24.
Here, the conductive film 40 may be any material having conductivity, and may be, for example, a metal film, a metal foil, a conductive resin, or the like. In other words, the conductive film 40 may be made of a conductive material that can be electrically connected to the pseudo root canal 23 through the through pores 24.

By storing the tooth model 2y having such a configuration in the storage case 3 and rotating the fixing operation part 353, the tip contact part 352 and the conductive film 40 can be brought into contact with each other (see FIG. 6B). .. Thereby, the conductive fixing member 35 and the conductive film 40 can be electrically connected to each other, so that one end of the electrode is connected to the conductive pillar 351 and the root canal is connected to the cutting tool 100 or the like for cutting the pseudo root canal 23. By connecting the other end of the electrode of the length measuring device, the distance between the pseudo root canal opening 231 and the apex 233 can be measured.

Further, in the tooth model 1y for root canal treatment, the tooth model 2y is stored in the storage case 3. However, instead of the tooth model 2y, the tooth model 2z shown in FIG. Even with the model 1z, the distance between the pseudo root canal 231 and the apex 233 can be measured.
Hereinafter, the tooth model 2z will be described with reference to FIG. Here, FIG. 7 shows a cross-sectional view corresponding to the cross-sectional view taken along the line BB in FIG. That is, a sectional view showing the state of the tooth model 2z housed in the housing case 3 is shown.

As shown in FIG. 7, the tooth model 2z is different from the tooth model 2 in that the inner periphery of the pseudo root canal 23 is integrally covered with a conductive root canal conductive portion 50.
More specifically, the root canal conductive portion 50 has conductivity and is made of a conductive resin having hardness similar to that of the root canal, and the root canal conductive portion 50 has a predetermined thickness.

Like the tooth model 2, the tooth model 2z thus configured can be housed in the housing case 3 and the groove 22 is pressed by the conductive fixing member 35 to fix the tooth model 2z. Then, by pouring a predetermined amount of the physiological saline S from the water supply part 33, the storage part 321, the recess 322, and the groove part 22 can be filled with the physiological saline S.

By storing the physiological saline S in the storage portion 321, the concave portion 322, and the groove portion 22 in this manner, the pseudo root canal 23, the groove portion 22, and the storage concave portion 32 are separated by the physiological saline S and the root canal conductive portion 50. It becomes possible to conduct electricity. Thereby, both electrodes of the root canal length measuring device are connected to the conductive fixing member 35 and the tip of the cutting tool 100, the tip of the cutting tool 100 and the root apex 233 are electrically connected, and the impedance value can be measured, The distance between the pseudo root canal opening 231 and the apex 233 can be measured.

By cutting the root canal conductive portion 50 with the cutting tool 100 and enlarging the root canal, the impedance value between the tip of the cutting tool 100 and the root apex 233 decreases, so this value is a predetermined value. When it becomes (for example, set to 6.5 kΩ or the like), it can be known that the tip of the cutting tool 100 comes closest to the apex 233.

Further, for example, the storage case 3 has a storage recess 32 capable of storing the tooth model 2, but the storage case 3 does not necessarily have this configuration, and may be a thin storage tape 3w as shown in FIG. 8, for example.
The storage tape 3w will be described below with reference to FIG.

Here, FIG. 8 is an explanatory view of the storage tape 3w attached to the tooth model 2, and more specifically, FIG. 8A shows a root canal treatment with the storage tape 3w attached to the tooth model 2. FIG. 8B is a schematic perspective view of the tooth model 1w for use, and FIG. 8B is a sectional view taken along the line CC in FIG. 8A. In FIG. 8A, the inside of the tooth model 2 made of a transparent material is indicated by a broken line.

Root canal treatment for tooth model 1w is Ru configuration der pasted the storage tape 3w downward side of the tooth model 2 (see FIG. 8 (a)). In this case, since the storage tape 3w is attached so as to be in close contact with the tooth model 2, as shown in FIG. 8B, the groove 22 and the storage tape 3w form a bottomed groove. Become.
Here, the storage tape 3w is a thin plate-shaped body that can be bent, and a removable adhesive is applied to one surface side. For example, insulating tape can be used.

Further, as a modification of the storage tape 3 w , an adhesive is sprayed on a part of the side surface of the tooth model 1 w for root canal treatment , and powder such as an insulating material is sprayed on the outside thereof to form an opaque surrounding member. Alternatively, the powder may be peeled off by rubbing with a finger.
However, if the storage tape 3w is electrically conductive, the root canal length cannot be accurately measured, so it is necessary to make it electrically insulating. An iron clip (not shown) is attached to the upper portion of the storage tape 3w, and a root canal length measuring oral electrode is attached to the clip to measure the root canal length.

The root canal treatment tooth model 1 having such a configuration is formed of a transparent material, and a tooth model 2 in which a pseudo root canal 23 imitating a root canal of a tooth is provided and an opaque material. At the same time, it is configured with the storage case 3 that is detachably surrounded by at least the lower side surface of the tooth model 2, so that the bending state and the direction of the pseudo root canal 23 are visually observed when the pseudo root canal 23 is cut. This can be prevented, and the pseudo root canal 23 cut easily and accurately can be evaluated.

More specifically, since the lower side surface of the tooth model 2 can be covered with the storage case 3, it is possible to prevent visually recognizing the bending condition, direction, shape, etc. of the pseudo root canal 23, which is close to actual treatment. In this state, the pseudo root canal 23 can be cut. Note that, for example, by making the upper surface of the tooth model 2 opaque, it is possible to prevent the degree of bending of the pseudo root canal 23 from being grasped.
Further, since the tooth model 2 removed from the storage case 3 is transparent, the cutting situation of the pseudo root canal 23 after cutting can be evaluated easily and easily.

Furthermore, since the tooth model 1 for root canal treatment has a simple structure including the tooth model 2 and the storage case 3, no space is required to perform root canal treatment using the tooth model 1 for root canal treatment. The pseudo root canal 23 can be cut and the cut pseudo root canal 23 can be confirmed without considering the location and the like.

Further, instead of the tooth model 2, by using a tooth model 2x provided internally with a plurality of pseudo root canals 23 having different curved shapes, various curved shapes can be obtained by using one tooth model 1 for root canal treatment. The plurality of simulated root canals 23 can be cut, and the usage of the cutting tool 100 can be efficiently learned.

Moreover, since the pseudo root canal 23 having various curved shapes can be cut by the cutting tool 100, the cutting accuracy, durability, and comfort of use of the used cutting tool 100 can be appropriately evaluated. Furthermore, it can be used as a tooth model 2 corresponding to a tooth having a plurality of root canals such as molars, and the pseudo root canal 23 can be cut in a state closer to actual root canal treatment.

Further, the storage case 3 is provided with the storage portion 321 for storing the tooth model 2, so that the tooth model 2 is surely stored in the storage case 3 and the lower side surface of the tooth model 2 is surrounded by the storage case 3 so that the pseudo root canal 23 Can be surely covered.

Furthermore, the case body 31 forming the storage case 3 and the tooth model body 21 forming the tooth model 2 are made of a non-conductive material, and the tooth model 2 has a root apex portion (root apex 233) in the pseudo root canal 23. ) Is provided to the outside through the through hole 24, and the tooth model 2 is communicated with the pseudo root canal 23 through the through hole 24 from the outside of the storage case 3 in the housed state where the tooth model 2 is housed in the housing 321. The distance from the pseudo root canal opening 231 of the pseudo root canal 23 to the apex 233 of the pseudo root canal 23 can be measured.

More specifically, the case body 31 and the tooth model body 21 are made of a non-conductive material, and the pseudo root canal 23 and the groove 22 (and the recess 322) are communicated with each other through the through pore 24. Therefore, the conductivity between the pseudo root canal 23 and the groove 22 (and the recess 322) can be ensured, and the impedance value from the tip of the cutting tool 100 to the root apex 233 of the pseudo root canal 23 can be measured. Therefore, the distance from the pseudo root canal opening 231 of the pseudo root canal 23 to the apex 233 of the pseudo root canal 23 can be measured.

In addition, the bottomed groove portion 22 communicating with the pseudo root canal 23 through the through pores 24 is provided on the side surface of the tooth model 2, or the storage case 3 is provided between the tooth model 2 stored in the storage portion 321. By providing the concave portion 322 in the, the distance from the pseudo root canal opening 231 of the pseudo root canal 23 to the apex 233 of the pseudo root canal 23 can be measured.

More specifically, by having the groove portion 22 and the recess portion 322, the physiological saline S having conductivity is stored in the groove portion 22 and the recess portion 322, and the pseudo root canal 23 and the groove portion 22 (recess portion 322) are provided with the through pores 24. Can be conducted through. Accordingly, the impedance value from the tip of the cutting tool 100 to the root apex of the pseudo root canal 23 can be measured, and the distance from the tip of the cutting tool 100 to the root apex 233 of the pseudo root canal 23 can be measured.
Although both the groove 22 and the recess 322 are provided in the present embodiment, only one of the groove 22 and the recess 322 may be provided.

In addition, a conductive film 40 having conductivity is attached to the groove bottom of the groove portion 22 to connect one electrode of the root canal length measuring device to the conductive film 40, and to form the groove portion 22 and the root canal length measuring device. Can be electrically connected. Thereby, the impedance value between the groove portion 22 and the pseudo root canal 23 can be measured, and the distance from the pseudo root canal opening 231 of the pseudo root canal 23 to the root apex 233 of the pseudo root canal 23 can be measured.
The conductive film 40 may be attached to the recess 322, or may be attached to both the groove 22 and the recess 322.

Further, since the conductivity of the pseudo root canal 23 can be ensured by providing the root canal conductive portion 50 having conductivity inside the pseudo root canal 23, the groove 22 and the pseudo root canal having a conductive structure can be secured. By measuring the impedance value with respect to 23, the distance from the pseudo root canal opening 231 of the pseudo root canal 23 to the apex 233 of the pseudo root canal 23 can be measured.

In addition, when the root canal conductive portion 50 having conductivity is provided inside the pseudo root canal 23 and the root canal communicating portion is constituted by the conductive root canal communicating portion, the conductive substance such as the physiological saline S is used. The impedance value can be measured without using. Therefore, the efficiency of preparation and cleaning can be improved.

Furthermore, in addition to providing the root canal conductive portion 50 having conductivity inside the pseudo root canal 23, by filling the groove 22 and the recess 322 with a conductive substance, the groove 22 and the recess 322 and the pseudo root canal 23. The electrical connection between the cutting tool 100 and the root tip apex 233 of the pseudo root canal 23 can be measured more accurately. Therefore, the distance from the pseudo root canal opening 231 of the pseudo root canal 23 to the root apex 233 of the pseudo root canal 23 can be measured more accurately.

Further, by providing the conductive fixing member 35 for fixing the tooth model 2 housed in the housing part 321, the tooth model 2 housed in the housing part 321 of the housing case 3 can be securely fixed, so that the root canal treatment can be performed. It is possible to prevent the tooth model 2 from being accidentally detached from the storage case 3 or displaced during the training. In other words, it is possible to prevent the tooth model 2 from moving with respect to the storage case 3 while cutting the pseudo root canal 23 using the tooth model 1 for root canal treatment. The accuracy of the cutting tool 100 and the like can be evaluated properly.

Further, a conductive fixing member 35 that is made of a conductive material and that enables electrical connection between the pseudo root canal 23 and the outside through the through pores 24 is provided. By fixing the tooth model 2 to the storage case 3, one of the electrodes of the root canal length measuring device can be reliably connected to the conductive fixing member 35, and one of the electrodes of the root canal length measuring device fixes the conductive fixing member 35. Via the root canal communication portion. Therefore, the root canal length can be measured by measuring the impedance value between the root apex 233 of the pseudo root canal 23 and the tip of the cutting tool 100 using the conductive fixing member 35.

Further, since the conductive fixing member 35 is integrally configured with the function of allowing the pseudo root canal 23 and the outside to be electrically conductive and the function of fixing the tooth model 2 to the storage case 3, the efficiency of the assembling work can be achieved. At the same time, the number of parts can be reduced.

Further, by making it possible to replace a plurality of tooth models 2 with respect to one storage case 3, it is possible to dispose of only the tooth model 2 used for root canal treatment training and root canal cutting. That is, since it is possible to replace only the tooth model 2, it is not necessary to generate unnecessary waste, and the cost can be reduced.

The storage tape 3w is made of a thin film or thin-walled thin body, and is configured to be attached to at least the lower side surface of the tooth model 2 so that the storage tape 3w is attached to the lower side surface of the tooth model 2. The bending condition, the direction, the shape, and the like of the pseudo root canal 23 can be covered only by sticking it, and the cutting condition of the pseudo root canal 23 can be evaluated only by removing the storage tape 3w.

In the correspondence between the configuration of the present invention and the above-described embodiment,
The root canal conductive portion corresponds to the root canal conductive portion 50,
The conductive root canal communicating portion corresponds to the conductive film 40,
The enclosing member corresponds to the storage case 3,
The fixing portion and the conductive member correspond to the conductive fixing member 35,
The liquid corresponds to physiological saline S,
The root canal communicating portion corresponds to the groove 22 and the recess 322, but the present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

For example, in the present embodiment, the tooth model 2 and the tooth model 2x have the tooth model main body 21 formed of a transparent material, but the entire body does not necessarily have to be transparent, and for example, the upper surface is made of an opaque material. Alternatively, part of the side surface may be made of an opaque material. Furthermore, the tooth model main body 21 may be made of a liquid crystal material which becomes transparent by applying an electric current to the tooth model main body 21. That is, in the tooth model 2, at least a part of the lower portion may be transparent when confirming the cutting result of the pseudo root canal 23 after cutting the pseudo root canal 23.

As a result, for example, it is possible to more reliably prevent visual observation of the direction and shape of the pseudo root canal 23 from the upper surface, and it is possible to perform the cutting work of the pseudo root canal 23 in a state close to the actual root canal treatment, and to practice dentistry. Raw can experience the cutting of the pseudo root canal 23 which is close to reality.

Further, in the present embodiment, the groove 22 and the recess 322 are configured to be filled with the physiological saline S, but the physiological saline S does not have to be used as long as it has conductivity, and tap water or a gel substance may be used. It does not matter, and further, these may be combined.

Further, in the present embodiment, the tooth model 2 is stored in the storage case 3 from above, but it is not always necessary to store the tooth model 2 from above, and the tooth model 2 is stored in the storage case 3 from below as shown in FIG. It may be configured to be stored. Further, in this case, the storage case 3 may be covered with the pseudo-crown portion 60 formed in the same manner as the actual tooth. Note that the pseudo crown portion 60 does not need to have the canopy cut. Further, the groove 22 is formed in the tooth model 2 and the physiological saline S is poured into the groove 22. However, the groove 22 is not always formed, and the through-pores 24 are immersed in the physiological saline S in the storage case. It should be held at 3.

Furthermore, in the present embodiment, the conductive fixing member 35 has a fixing function and a conductive function. For example, as shown in FIG. 10, a fixing portion 36 for fixing the tooth model 2 to the storage case 3, The groove 22 or the recess 322 may be constituted by the conductive portion 37 capable of electrically connecting to the outside.

Further, although the tooth model 2 has a rectangular parallelepiped shape, it does not necessarily have to have a rectangular parallelepiped shape, and may have a columnar shape, for example, various tooth shapes. When the tooth model 2 has a cylindrical shape, it is preferable to provide a rotation blocking portion so that the tooth model 2 does not rotate inside the storage case 3.
For example, with respect to the tooth model 2 having a tooth shape, the number of pseudo root canals 23 may be appropriately adjusted according to the shape (molar teeth or the like). As a result, it is possible to cut the pseudo root canal 23 according to a more actual root canal treatment.

Further, the storage case 3 does not have to be a cylindrical body, and may have a suitable shape such as a rectangular parallelepiped shape or may have a gingiva shape. If the accommodating case has a gingival shape, the pseudo root canal 23 can be cut in accordance with the actual root canal treatment.

Furthermore, at least one of the tooth model 2 and the storage case 3 may be made of an elastic material, which allows the tooth model 2 or the storage case 3 to be deformed when the storage case 3 is removed from the tooth model 2. Therefore, it can be easily removed.

The configurations described above are not necessarily limited to the configurations described above, and the respective configurations may be combined. Specifically, the tooth model 2y may be stored in the storage case 3, or the storage tape 3w may be attached to the tooth model 2y.

1, 1x, 1y, 1z, 1w Root canal treatment tooth model 2, 2x, 2y, 2z Tooth model 22 Groove portion 23 Pseudo root canal 24 Through hole 3 Storage case 3w Storage tape 321 Storage portion 322 Recess 35 Conductive fixing member 36 Fixed part 37 Conductive part 40 Conductive film 50 Root canal conductive part

Claims (18)

A tooth model formed of a transparent material and having a pseudo root canal imitating a root canal of a tooth provided therein,
It is formed of an opaque material, and is composed of a surrounding member that is detachably surrounded by at least the lower side surface of the tooth model ,
In the surrounding member,
A storage unit for storing the tooth model is provided,
The surrounding member and the tooth model are made of a non-conductive material,
The tooth model is provided with penetrating pores penetrating from the apex portion of the pseudo root canal to the outside,
A root canal treatment unit is provided in which the tooth model is housed in the housing unit, and a root canal communicating unit that communicates with the pseudo root canal from the outside of the enclosing member through the through pores is provided. Tooth model. The tooth model for root canal treatment according to claim 1, wherein a plurality of the pseudo root canals having different curved shapes are provided inside the tooth model. On the side surface of the tooth model, a bottomed groove portion that communicates with the pseudo root canal through the through pore is provided,
The tooth model for root canal treatment according to claim 1 or 2 , wherein the groove portion functions as the root canal communicating portion. In the surrounding member,
A recess is provided between the tooth model stored in the storage section,
Root canal treatment for tooth model according to any one of claims 1 to 3 wherein the recess functioning as the root canal communicating portion. In the recess,
The tooth model for root canal treatment according to claim 4 , which is electrically conductive and in which a liquid capable of measuring a root canal length of the pseudo root canal and the root canal communicating portion is stored via the through-pore. The root canal communicating portion, root canal treatment for tooth model according to any one of claims 1 to 5 composed of a conductive Shokon pipe communicating portion having conductivity. Inside, root canal treatment for tooth model according to any one of claims 1 to 6 root canal conductive part having conductivity is provided in the pseudo root canal. Root canal treatment for tooth model according to any one of claims 1 to 7 fixing portion is provided for fixing the housing to said tooth model in the storage unit. A conductive member is provided that is made of a conductive material and that enables electrical connection between the pseudo root canal and the outside through the through pores.
The tooth model for root canal treatment according to claim 8 , wherein the conductive member functions as the fixing portion. The tooth model for root canal treatment according to any one of claims 1 to 9 , wherein there are a plurality of replaceable tooth models for one of the enclosing members. A tooth model formed of a transparent material and having a pseudo root canal imitating a root canal of a tooth provided therein,
It is formed of an opaque material, and is composed of a surrounding member that is detachably surrounded by at least the lower side surface of the tooth model,
The surrounding member is
A tooth model for root canal treatment, which is composed of a thin film or thin-walled thin body and is configured to be attached to at least a lower side surface of the tooth model. The tooth model for root canal treatment according to claim 11 , wherein a plurality of the pseudo root canals having different curved shapes are provided inside the tooth model. The surrounding member and the tooth model are made of a non-conductive material,
The tooth model is provided with penetrating pores penetrating from the apex portion of the pseudo root canal to the outside,
The root canal treatment according to claim 11 or 12 , wherein a root canal communicating portion that communicates with the pseudo root canal from the outside of the surrounding member via the through pore is provided in a state of being surrounded by the surrounding member. Tooth model. A pseudo root canal imitating a root canal in a tooth is provided inside, and is detachably surrounded by at least a lower side surface of a tooth model formed of a transparent material, and is formed of an opaque material ,
An enclosing member that is formed of a thin-film or thin-walled thin body and that can be attached to at least the lower side surface of the tooth model . The enclosure member according to claim 14 , further comprising a storage portion for storing the tooth model. The enclosure member according to claim 15 , further comprising a fixing portion that fixes the tooth model stored in the storage portion. Composed of non-conductive material,
In the stored state in which the tooth model is stored in the storage portion, penetrates from the root apex portion of the pseudo root canal to the outside, through the through pores provided in the tooth model, from the outside to the pseudo root canal. The enclosure member according to claim 15 or 16 , wherein a root canal communicating portion that communicates is provided. Composed of transparent non-conductive material,
A pseudo root canal that imitates the root canal of a tooth is provided inside,
At least the lower side surface has a storage portion, and is removably surrounded by a surrounding member made of an opaque member,
The pseudo root canal is provided with a through hole penetrating from the apex portion to the outside,
A tooth model in which a bottomed groove communicating with the pseudo root canal is provided on a side surface in a state of being accommodated in the accommodation part via the through-pore.

Images