JPH0723823Y2 - Tooth implant model for endodontics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a dental implant model for endodontic therapy, which is used for practical training in dentistry clinical education, particularly for practical training for measuring the electric root canal length.

[Conventional technology]

In the clinical education of dentistry, pre-clinical training called model training is performed, and in subsequent clinical training, clinical observation training and patient training to actually treat a patient are performed.

The model training that is first performed is traditionally a technique-based training with a strong color, and is usually performed using various tooth models and jaw models.

For example, when treating a patient's tooth, the length of the tooth root can be easily known because the crown that has emerged in the oral cavity can be observed from the outside. Since it is covered and buried in the jawbone, it cannot be observed from the outside. Moreover, the length of the root portion varies depending on the patient, and it is very important to know the correct root canal length when performing treatment.

Therefore, to date, an electric root canal length measuring device has been developed as a device for measuring the length of a root canal, and has been widely used in dental treatment.

However, as a tooth model for dental training for carrying out training using such an electric root canal length measuring device, there is only a plastic model in which the form of the dentition is simply restored. There is no structure that allows advanced training using teeth.

Under the current circumstances as described above, it is desired to develop a jaw model capable of performing training for measuring the root canal length using natural teeth or artificial teeth.

In addition, the jaw models that have been used so far have the drawback that the radiography must be divided into several times along the dentition when the X-ray radiography practice is performed, and the X-ray radiography is easier to perform.
There is also a demand for what can be practiced in radiography.

[Problems to be solved by the device]

INDUSTRIAL APPLICABILITY The present invention improves the above-mentioned drawbacks and enables natural teeth or artificial teeth for practice of endodontic therapy to be implanted at a desired position, so that endodontic practice closer to a living body, particularly electrical root canal length measurement practice. It is an object of the present invention to provide a tooth implantation model having a structure that is suitable for X-ray imaging training as well.

[Means for Solving the Problems]

The tooth implantation model for endodontic treatment of the present invention is one in which a tooth defect portion is formed on at least a part of a jaw model formed by integrally molding a jaw and a tooth, and the tooth defect portion has There is a cavity that penetrates the teeth corresponding to the defect, and a conductive substrate with electrical conductivity is placed at the bottom of the cavity so that it can be connected to the conductor. And that the jaws can be divided so as to vertically divide the dentition.

That is, in the present invention, there is a cavity in which a natural tooth or an artificial tooth for endodontic therapy training can be implanted in the tooth defect portion provided in at least a part of the jaw model, and this cavity is Since it penetrates so as to reach a conductive substrate having electrical conductivity, which is placed at the bottom of the jaw, the cavity is filled with a conductive material, and a natural tooth or an artificial tooth for endodontic practice is made of a conductive material. The root canal length can be measured by an electric root canal length measuring device by using it by implanting it so that it is embedded in the.

Further, in the endodontic tooth implantation model of the present invention, the jaw has a structure capable of vertically dividing the dentition, and the dentition portion of the jaw is formed in a plurality in the direction perpendicular to the dentition. Since it can be divided into parts, the tooth row parts after the division can be arranged on a straight line to easily practice X-ray imaging.

First, an example of the present invention is shown in the drawings, and the present invention will be described in detail.

FIG. 1 is a model of endodontic tooth implantation according to the present invention (having upper and lower anterior teeth, upper first premolar and upper first molars having tooth defects, and left and right teeth). FIG. 2 is a perspective view showing an example of a maxillary model having a structure in which the dentition portion is dividable between the maxillary second premolar and the maxillary first molar, and FIG. 2 is a model diagram of the tooth implantation shown in FIG. A plan view and FIG. 3 are A- of FIG.
FIG. 4 is a side view of a cross section taken along line B, FIG. 4 is a cross-sectional view of a planting portion when a natural tooth is planted in a cavity provided in a tooth defect portion, and FIG. 5 is a tooth planting shown in FIG. It is a figure showing the state when the tooth row part of a model is divided into three parts.

In the endodontic dental implant model of the present invention illustrated in the drawings, a method for implanting a natural tooth or an artificial tooth for endodontic practice is as follows.

First, the cavity (4) provided in the tooth defect portion (3) is filled with the conductive material (17). As such materials,
For example, a cotton ball moistened with physiological saline, an electrocardiographic measurement paste, a conductive paste having a biologically similar conductivity, or the like can be used. Then, the root portion (13) of the tooth (2) to be planted is sufficiently coated with the temporary fixing wax (18) to temporarily fix the tooth defective portion (3). After the temporary fixing, the immediate polymerization resin (19) is filled in the vicinity of the tooth neck (16) and hardened to fix the tooth (2) upright.

As shown in FIG. 4, in the tooth implantation model using natural teeth as the tooth (2), the cross-sectional structure at the tooth implantation portion is such that the conductivity from the apex portion (14) of the tooth (2) increases. The cavity (4) up to the substrate (5) is filled with the conductive material (17), the lead wire (7) is attached to the conductive substrate (5),
This is connected to a commercially available electric root canal length measuring device. The lead wire (7) may be directly attached to the conductive substrate (5) by soldering or the like, or may be connected using an attachment jig.

Next, a method for measuring the root canal length using the endodontic dental implant model of the present invention will be described.

First, the enamel (9) and the dentin (10) at the center of the tooth (2) that has been planted as described above are cut, and an electrode needle for measuring the root canal length is placed in the pulp cavity (11). insert. Then, the electrode needle is gradually inserted in the direction of the root apex (14), and is inserted through the root canal (12) until the tip of the electrode needle finally reaches the root apex (15). It contacts the conductive material (17) filled in the cavity (4). At this time, a current flows through the conductive substrate (5) through the conductive material (17), and the length of the root canal (12) can be known by detecting this current with an electric root canal length measuring device. it can. In the tooth implantation model illustrated in the drawings, the conductive substrate (5)
Although the insulating substrate (6) is provided on the back surface of the above, the installation of such an insulating substrate (6) is optional.

In the endodontic dental implant model of the present invention, it is preferable to use natural teeth as a tooth (2) to be implanted for practical training close to a living body, but it is difficult to obtain a natural tooth at a desired position. In such cases, artificial teeth for endodontic training may be used.

In the present invention, the tooth (2) used as an artificial tooth for endodontic training has a structure similar to that of a natural tooth as shown in FIG. There is a pulp cavity (11) and a root canal (12) in the part, and a root apex (14) at the end of the root canal (12) has a root apex (15) connecting the inside and outside of the tooth. It is provided.

Further, in the endodontic tooth implantation model of the present invention, the tooth defect portion can be provided at an arbitrary site, and the left and right central incisors of the upper jaw dentition, which is a typical site, is a particularly typical site. , It is preferable to provide at least a part of the first premolar and the first molar, or the left and right first molars of the mandible, respectively. A model having a tooth defect portion at these positions is very useful as a training for root canal length measurement. Will be suitable for.

Further, the endodontic dental implant model of the present invention has a structure in which the jaw can divide the dentition in the vertical direction, and in particular, the dentition part of the jaw is 3 as shown in FIG. A structure that can be divided into two parts is suitable.

In this way, when the tooth row portion can be divided into a plurality of portions, it is possible to arrange the tooth row portions after the division in a straight line and perform X-ray photography, so that it is only necessary to take the image once, which is very convenient. Is. Moreover, since the tooth row portion used for the training can be removed and replaced with a new tooth row portion, the training for the same portion can be repeated, which is very economical. The division position when dividing the dentition portion is not particularly limited as long as it is a position between the teeth, but the second premolar and the first premolar of the upper, lower, left, and right dentition are not limited.
It is preferable to be able to divide between the molars, and in this case, it is possible to divide in the state shown in FIG.

Further, it is preferable to form a U-shaped groove (8) along the tooth row inside the tooth row as illustrated in the drawing. By providing such a groove (8) , X-ray film can be easily inserted, and it can be used without dividing X
It makes line photography very easy.

Further, in the endodontic dental implant model of the present invention, either the maxilla model or the mandibular model may be used from the viewpoint of being used for educational practice, but the model is similar to that of the actual living body. In order to meet the conditions, it is preferable to attach an upper jaw model and a lower jaw model to the head model to have an integrated structure, and by performing root canal length measurement using such a structure, it is close to a living body. Practical training under the circumstances, so-called phantom training can be conducted.

The material of the jaw of the tooth implantation model of the present invention is not particularly limited, and general plastics can be used, and polyurethane resin, epoxy resin, polyester resin, melamine resin, etc. are suitable. ing. The material of the conductive substrate placed on the bottom of the jaw is not particularly limited, and general metals such as iron plate and copper plate, and other conductive materials can be used.

〔Example〕

An upper jaw (1) made of epoxy resin having the shape and structure shown in FIG. 1 was produced by molding using a rubber mold.

In the upper jaw (1), the left and right central incisors, the first premolars and the first molars were pierced with a size enough to implant a tooth corresponding to each defect site. A tooth defect portion (3) having a cavity (4) is formed, the tooth (2) at the other position is integrated with the upper jaw (1), and the dentition part further includes the left and right second premolars. It can be divided vertically into three parts between one molar, and a U-shaped groove (8) is formed inside the dentition along the dentition.

Then, a conductive substrate (5) is provided on the bottom of the upper jaw (1).
As a result, a metal substrate having a thickness of about 0.2 mm was fixed, and a plastic plate having a thickness of about 1.5 mm was fixed as an insulating substrate (6) on the back surface thereof.

Further, the lead wire (7) was attached to the above-mentioned metal substrate by soldering to obtain the endodontic dental implant model of the present invention.

When carrying out the practice of measuring the root canal length using the above endodontic tooth implantation model, first, the electrocardiogram measurement paste as a conductive material (17) is placed in the cavity (4) of the tooth defect portion (3). , And the roots (13) of the natural teeth corresponding to the respective parts were sufficiently coated with utility wax (manufactured by Jitsu Dental Industry Co., Ltd.) as a temporary fixing wax (18) and then planted. Temporarily fix it, and then the neck (16)
Acrylic polymer resin (trade name: Ostron, manufactured by Jiji Dental Kogyo Co., Ltd.) was filled in the vicinity as an instant polymerized resin (19), cured, and the tooth (2) was fixed by erection.

And, the other end of the lead wire (7) attached to the metal substrate is a commercially available electric root canal length measuring device (manufactured by Onuki Iki Co., Ltd.,
It was connected to an end dontic meter (SII).

In the practice of measuring the root canal length, first, the enamel (9) and the dentin (10) at the center of the tooth were cut, and an electrode needle for measuring the root canal length was inserted into the pulp cavity (11). Then, when this electrode needle is gradually inserted into the apex portion (14) side, it can be detected that the electrode needle reaches the apex hole (15) and a current flows, until the current flows. The insertion distance was the root canal length.

The root canal length measured by the above method is accurate, and by using the endodontic dental implant model of the present invention, the root canal length measurement training can be performed in a situation very close to that of a living body. It was

As shown in FIG. 5, the upper jaw was divided into three parts between the left and right second premolars and the first molars of the dentition, and the divided dentition parts were arranged in a straight line for X-ray photography. In that case, it was very efficient because it was possible to shoot in one shot.

[Effects of the Invention] The endodontic dental implant model of the present invention can implant a natural tooth or an artificial tooth in a tooth defect portion provided on the jaw, so that the tooth is close to a living body. It is very suitable for the practice of measuring root canal length.

Further, since the tooth defect portion can be provided at any position in the dentition, the root canal length can be measured at any position.

Further, in the endodontic tooth implantation model of the present invention, the dentition part of the jaw can be divided into a plurality of parts, and each dentition part can be aligned in a straight line to perform X-ray imaging. It is very convenient because there is no need to shoot.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a tooth implantation model for endodontic treatment of the present invention, FIG. 2 is a plan view of the tooth implantation model shown in FIG. 1, and FIG. 3 is FIG. FIG. 4 is a side view in a cross section taken along line AB of FIG. 4, FIG. 4 is a cross-sectional view of a planting portion when a natural tooth is planted in a cavity provided in a tooth defect portion, and FIG. 5 is shown in FIG. It is a figure showing the state at the time of dividing the tooth row part of a tooth implantation model into three parts. (1) ...... Jaw (2) ...... Tooth (3) ...... Tooth defect (4) ...... Cavity (5) ...... Conductive substrate (6) ...... Insulating substrate (7) ...... Lead wire ( 8) …… Groove (9) …… Enamel (10) …… Dentin (11) …… Pulp cavity (12) …… Root canal (13) …… Root (14) …… Apex (15) ) Root apex (16) …… Tooth neck (17) …… Conductive material (18) …… Temporary fixing wax (19) …… Immediate polymerization resin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shinichi Takashima 21-116 Nishi-Nanajo Nagura-cho, Shimogyo-ku, Kyoto City, Kyoto Prefecture (56) References JP-A-50-36229 (JP, A)

Claims (2)

[Scope of utility model registration request] 1. A tooth defect part (3) is formed on at least a part of a jaw model formed by integrally molding a jaw (1) and a tooth (2), and the tooth defect part ( 3) is provided with a through cavity (4) having a size capable of implanting teeth corresponding to the defect site, and the bottom of the cavity (4) has a conductive material having electrical conductivity. Tooth for endodontic treatment, characterized in that the flexible substrate (5) is arranged so as to be connectable to a lead wire, and that the jaw (1) can be divided by vertically dividing the dentition. Planting model. 2. The tooth according to claim 1, wherein the tooth loss portion (3) is at least a part of the central incisor portion, the first premolar portion and the first molar tooth portion of the dentition. Tooth implant model for internal therapy.