Teaching Models and Methods for Root Canal Treatment of Extracted Teeth / Model Teeth with Electrical Measurement Function

Abstract

This invention belongs to the technical field of oral medicine teaching equipment. Specifically, it relates to a teaching model and method for root canal treatment of extracted teeth / model teeth with electrical testing function. The model includes a dental arch model base, a uniquely shaped embedding hole, a conductive sheet, and a double-layer embedding medium. The base has a magnetic snap-fit ​​at the bottom to fit a standard oral simulation head model. The uniquely shaped embedding hole is narrow at the top and wide at the bottom, with a flat, round groove featuring a pyramidal structure. The conductive sheet is inserted through a narrow groove in the side wall, contacting the conductive paste on the inner side and having a connecting ring on the outer side. The double-layer embedding medium includes conductive paste covering the root apex and a hot-melt wax liquid forming rigid support. The method of use includes model preparation, tooth embedding, root canal treatment training, disassembly and cleaning, and reuse. This invention, through its physical structure design, solves the pain points of traditional models, such as inability to perform electrical testing, difficulty in cleaning and reuse, and low clinical simulation realism. It achieves highly realistic training in root canal treatment of extracted teeth / model teeth, suitable for undergraduate teaching in oral medicine and standardized training for clinical physicians.

Description

Technical Field

[0001] This invention belongs to the field of oral medicine teaching equipment technology, specifically, it relates to a teaching model and method for root canal treatment of extracted teeth / model teeth with electrical testing function. Background Technology

[0002] Root canal treatment is a core technology in the oral medicine treatment system. Practical training in root canal treatment is a crucial step in cultivating the operational skills of oral medicine students and junior clinicians, bridging theory and clinical practice. Training utilizes extracted teeth or 3D-printed model teeth with natural tooth roots and canal morphology. The practical training uses training models equipped with electrical root canal length measurement capabilities and designed to simulate real clinical scenarios, which are essential for ensuring the effectiveness of root canal treatment training. Therefore, developing root canal treatment teaching models that meet the needs of oral medicine teaching, enable electrical root canal length measurement, and provide a realistic clinical experience has become an important research direction in the field of oral medicine teaching equipment.

[0003] In the technological development of root canal treatment teaching models, traditional early models mainly used plaster embedding or fully enclosed resin models. These models were the basic approach for root canal treatment training, but due to their structural and material characteristics, they had many unavoidable core technical defects and could not meet the needs of modern dental teaching. Firstly, plaster and resin are insulating materials, which cannot be used to build an effective conductive test circuit. They cannot be used with routine clinical root canal length measuring instruments to perform root canal length electrical measurement operations, which prevents trainees from practicing the core and key steps in root canal treatment. The training content is seriously out of touch with actual clinical operation. Secondly, the plaster embedding process has problems such as complicated operation and long curing time. Moreover, when the model is disassembled after the training, the plaster needs to be broken or ground off, which can easily cause irreversible damage to the extracted teeth / model teeth, making it difficult to achieve rapid and non-destructive recovery of extracted teeth / model teeth and postoperative root canal morphology observation and imaging examination. Third, these traditional models do not have an adaptation structure for use with standard dental simulation head models. If they need to be placed in simulation head models to train trainees' clinical operation skills and posture, an additional converter is required.

[0004] To address the core deficiencies of traditional models, such as the lack of electrical measurement capabilities, targeted improvements have emerged in existing technologies, such as the extraction / model tooth root canal length measurement and treatment model with authorization announcement number CN221687101U. This model, through the use of a mounting plate with tooth holes, and a conductive circuit constructed with convex bolts within the holes and a magnetic connection device, achieves accurate electrical measurement of the root canal length of extraction / model teeth for the first time. Simultaneously, its annular spiral structure with a hooked sleeve can be directly adapted to the metal hook of the root canal length measuring instrument, eliminating the need for manual wire winding and significantly simplifying the connection process. Furthermore, the bolts provide initial retention at the base of the extraction / model tooth, thus mitigating some of the core technological shortcomings of traditional models. However, this improved model still has significant limitations. It only addresses the "electrical measurement and connection" issue and does not address core needs in oral teaching such as clinical simulation, retention stability, cleaning and reuse, and adaptation of irregular teeth, making it difficult to meet the requirements of large-scale, clinical teaching and training. Firstly, the diameter and depth of the tooth holes in the model are designed according to the average size of teeth, which makes it poorly adaptable to irregularly shaped extracted teeth / model teeth with large size deviations, and easily leads to problems of loose retention. Secondly, extracted teeth / model teeth are only fixed at a single point at the bottom with bolts, without a rigid support structure. During the training operation, the teeth are prone to shaking and displacement, which not only affects the accuracy of root canal length measurement, but also has a huge difference from the retention feel of clinical natural teeth, thus affecting the training effect. Third, the model is a flat mounting plate structure, without an adaptation structure to the standard oral simulation human head model, so the realism of clinical simulation has not been substantially improved. Fourth, the conductive connection structure of the model is a combination of bolts and magnetic connectors. The connection points are prone to dirt accumulation and dead corners, making cleaning difficult. Long-term use may lead to poor conductive contact, thus limiting the reusability of the model.

[0005] In summary, all existing training models for root canal treatment using extracted teeth / model teeth have their own technical shortcomings: traditional plaster / resin models lack electrical measurement capabilities, have low reusability, and poor clinical simulation; the improved model CN221687101U only solves the connection problem between the electrical measurement and root canal measuring instrument, and still has significant deficiencies in retention stability, anatomical morphology simulation, adaptation to simulated human head models, and compatibility with irregularly shaped teeth. Currently, no existing technology can simultaneously achieve accurate electrical measurement of root canal length, stable retention of extracted teeth / model teeth, easy cleaning and reuse, adaptation to standard simulated human head models, conformity to the anatomical morphology of the human dental arch, and easy non-destructive recovery of extracted teeth / model teeth. The combination of these technical pain points means that existing models cannot meet the core training requirements of "clinicalization, large-scale application, and high reusability" in oral medicine education. Therefore, developing a teaching model for root canal treatment using extracted teeth / model teeth that combines the above functions and comprehensively solves the multiple shortcomings of existing technologies has become an urgent technical problem to be solved in this field. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a teaching model and method for root canal treatment of extracted teeth / model teeth with electrical testing capabilities, solving the technical problems of traditional models being unable to perform electrical testing, difficult to clean and reuse, and having low clinical simulation realism.

[0007] The present invention provides a teaching model for root canal treatment of extracted teeth / model teeth with electrical measurement function, comprising a dental arch model base, a special-shaped embedding hole, a pluggable conductive sheet, and a double-layer embedding medium; The irregularly shaped embedding hole is a flat, round groove that is narrow at the top and wide at the bottom. The irregularly shaped embedding hole is opened at a preset tooth position on the dental arch model base. A narrow groove is opened on the side wall of the irregularly shaped embedding hole. The conductive sheet is inserted into the bottom of the groove of the irregularly shaped embedding hole through the narrow groove. The bottom of the groove of the irregularly shaped embedding hole is filled with conductive paste, and the conductive paste completely covers the insertion end of the conductive sheet. The double-layer embedding medium fills the irregular embedding hole. The double-layer embedding medium includes a bottom conductive paste and a top hot-melt wax liquid. The conductive paste is used to wrap the root apex of the tooth. The hot-melt wax liquid forms a rigid support after cooling, and the height of the cooled hot-melt wax liquid is flush with the neck of the tooth. The root apex of the tooth is immersed in the conductive paste. The hot-melt wax liquid is medical paraffin liquid. It is injected into the irregular embedding hole until it is flush with the neck of the adjacent tooth. After standing and cooling, it solidifies. The dental arch model base is made of rigid insulating material, and a magnetic buckle is installed at the bottom of the dental arch model base. The magnetic buckle can be detachably fixed to the oral cavity simulation human head model. The conductive sheet is provided with a connecting ring for attaching the metal hook of the root canal measuring instrument. The root canal of the tooth is adapted to be inserted into the root canal file. The metal hook of the root canal measuring instrument can be attached to the connecting ring, and another electrode can be clamped to the handle of the root canal file to realize the root canal length measurement function. The top layer of hot-melt wax can be melted by heating in a warm water bath. The conductive sheet can be pulled out from the narrow groove of the irregularly shaped embedding hole. The irregularly shaped embedding hole is suitable for cleaning with a brush and saline solution. The dental arch model base and the pluggable conductive sheet are reusable.

[0008] Preferably, the dental arch model base is made of resin material by 3D printing, and the dental arch model base has the anatomical shape of the dental arch segment of the maxillary anterior region of the human body, and the magnetic buckle is adapted to the simulated human head model.

[0009] Preferably, the four corners of the groove bottom of the irregularly shaped embedding hole are provided with a pyramidal structure, and the irregularly shaped embedding hole is opened in the commonly used training tooth positions such as the incisors, premolars and molars of the dental arch model base.

[0010] Preferably, the conductive sheet is a stainless steel sheet with a thickness of 0.2 mm. The end of the conductive sheet extending to the bottom of the irregular embedding hole groove is polished smooth and in contact with the conductive paste. The conductive sheet can be completely pulled out from the narrow groove, so that a flat space without dead corners is formed inside the irregular embedding hole.

[0011] Preferably, the conductive paste at the bottom layer of the double-layer embedding medium is a medical conductive gel, the medical conductive gel has a filling thickness of 3 mm at the bottom of the irregular embedding hole and completely covers the conductive sheet extending to one end of the bottom of the hole, and the medical conductive gel wraps around the root apex of the tooth for a length of 2 mm.

[0012] Preferably, the top layer of the double-layer embedding medium is medical paraffin wax with a melting point of 70°C. The temperature at which the medical paraffin wax is heated and injected into the irregular embedding hole is 70°C, and the height of the cooled medical paraffin wax is flush with the neck of the adjacent tooth.

[0013] Preferably, the tooth positions of the anterior teeth, premolars, and molars on the dental arch model base are each independently provided with irregularly shaped embedding holes, and each irregularly shaped embedding hole is individually equipped with a pluggable conductive sheet and a double-layer embedding medium, so that the training operations of each tooth position do not interfere with each other.

[0014] Preferably, the resin material used for the dental arch model base is a dental model 3D printing material, and the 3D printed dental arch model base is matched to the human dental arch anatomy structure in a 1:1 ratio.

[0015] Preferably, the conductive connection part of the conductive sheet is a metal wire ring, which is adapted to be mounted on the metal hook of a routine clinical root canal length measuring instrument, forming a closed conductive circuit with the conductive sheet and conductive paste.

[0016] This invention also provides a method for using an extracted tooth / model tooth root canal treatment teaching model with electrical testing function, characterized by the following steps: Step S1: Model preparation. Insert the pluggable conductive sheet into the narrow groove to the bottom of the irregular embedding hole groove, fill the bottom of the irregular embedding hole groove with 3mm thick medical conductive gel and completely cover the surface of the conductive sheet. Step S2: Tooth embedding. Immerse the tooth root apex 2mm into medical conductive gel, inject 70℃ medical paraffin liquid into the irregular embedding hole until it is flush with the neck of the adjacent tooth, and let it stand for 5-10 minutes to cool and solidify. Step S3: Root canal treatment training. Fix the dental arch model base to the simulated human head model using the bottom magnetic clip. Isolate the tooth with a rubber dam. Open the pulp chamber, explore, and insert the root canal. Hang the metal hook of the root canal measuring instrument on the terminal ring of the conductive sheet. Clamp the other electrode of the root canal measuring instrument to the root canal file handle and insert it into the root canal to measure the root canal length. This completes the root canal treatment training.

[0017] Step S4: Disassembly and cleaning. Place the dental arch model base 1 in a 60℃ warm water bath for 5 minutes to melt the paraffin. Remove the tooth and pull out the conductive sheet. Use a brush and saline solution to thoroughly clean the irregular embedding holes. The removed tooth can be used to directly observe the root canal treatment results and take X-rays to confirm the completion of the root canal treatment.

[0018] Step S5: Reuse. Repeat steps S1-S4 on the cleaned and dried dental arch model base and conductive sheet to carry out the next round of training.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention constructs a stable conductive closed circuit using a pluggable conductive sheet and a double-layer embedding medium. The bottom layer of medical conductive gel wraps around the apex of the extracted tooth / model tooth and is in close contact with the conductive sheet. The top layer of medical paraffin forms a rigid fixation. The metal connector at the end of the conductive sheet directly adapts to the metal hook of a conventional clinical root canal measuring instrument, eliminating the need for additional wiring or winding operations. This achieves accurate electrical measurement of root canal length and replicates the actual electrical measurement process in clinical root canal treatment, allowing trainees to practice the core steps of electrical measurement in their entirety. This invention solves the problems of the lack of electrical measurement function in traditional models and the susceptibility of the first-generation improved model's electrical measurement accuracy to tooth movement.

[0020] 2. The dental arch model base of this invention is made of dental model 3D printing material and is matched to the anatomical structure of the maxillary anterior dental arch in a 1:1 ratio. The base is equipped with magnetic buckles at the bottom, which can be directly adapted to the simulated human head model of mainstream brands such as Nissin. This breaks the limitations of the flat structure of traditional models and the first-generation improved models, allowing trainees to carry out operations in a clinically relevant position and anatomical scenario, effectively cultivating the trainees' clinical operation feel and positional habits.

[0021] 3. The irregular embedding hole of the present invention is designed as a flat oval groove that is narrow at the top and wide at the bottom, and a pyramidal structure is provided in the groove. With the rigid support of the top layer of hot-melt medical paraffin, it can effectively prevent the wax block from falling out of the extracted tooth / model tooth under vertical tension or rotating under lateral force during the root canal operation, so as to achieve stable fixation of the extracted tooth / model tooth and avoid the impact of tooth shaking or displacement on the accuracy of electrical measurement and practical operation. At the same time, the filling method of the double-layer embedding medium does not require additional fixation treatment for the extracted tooth / model tooth, and is suitable for natural extracted teeth / model teeth of different sizes and shapes. It solves the problem of poor adaptability of the first-generation improved model with tooth holes designed according to the average size and irregular teeth, and greatly improves the applicability of the model.

[0022] 4. This invention uses hot-melt medical paraffin as the top layer embedding medium. After the training is completed, the model only needs to be placed in a 60°C warm water bath to melt the paraffin. There is no need to break the embedding material, and the extracted tooth / model tooth can be easily removed, realizing the non-destructive recycling of the extracted tooth / model tooth. This not only facilitates the observation and review of the root canal operation effect of the extracted tooth / model tooth after the training, but also allows the intact extracted tooth / model tooth to be reused, reducing the cost of teaching consumables and solving the technical defects of traditional plaster embedded models that are easy to damage the extracted tooth / model tooth when disassembling.

[0023] 5. The conductive sheet of this invention has a pluggable structure. After the training is completed, it can be completely pulled out from the narrow groove of the irregular embedding hole, so that the inside of the irregular embedding hole forms a flat space without dead corners. Combined with the method of melting paraffin with a warm water bath, the embedding hole can be thoroughly cleaned with a brush and physiological saline, effectively avoiding the problems of bacterial growth and conductivity failure caused by the residue of conductive paste and wax, and greatly improving the reusability of the model. At the same time, each tooth position is independently equipped with irregular embedding holes, conductive sheets and double-layer embedding media. The training operations of each tooth position do not interfere with each other, and multiple people and multiple tooth positions can be carried out at the same time, which is fully adapted to the large-scale needs of oral medicine teaching. Attached Figure Description

[0024] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2This is a schematic diagram of the irregular embedded hole structure of the present invention.

[0025] The following are the labeling elements in the figure: 1. Dental model base; 2. Irregularly shaped embedding hole; 3. Conductive sheet; 4. Double-layer embedding medium. Detailed Implementation

[0026] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0027] Example 1 like Figures 1-2 As shown, this embodiment discloses a teaching model for root canal treatment of extracted teeth / model teeth with electrical measurement function, including a dental arch model base 1, a special-shaped embedding hole 2, a pluggable conductive sheet 3, and a double-layer embedding medium 4.

[0028] The dental arch model base 1 is made of rigid insulating material and has the anatomical morphology of the maxillary anterior dental arch segment. In this embodiment, the dental arch model base 1 is made by 3D printing using dental model 3D printing material. The bottom of the dental arch model base 1 is equipped with a magnetic clasp that is compatible with simulated human head models from mainstream brands such as Nissin. The dental arch model base 1 has irregularly shaped embedding holes 2 on commonly used training teeth such as anterior teeth, premolars, and molars. The irregularly shaped embedding holes 2 are flat oval grooves that are narrow at the top and wide at the bottom. The four corners of the groove bottom are equipped with pyramidal structures to prevent the cooled wax block from falling out under the vertical pulling force during root canal operations (pulp removal or enlargement) or rotating under the lateral force. The sidewalls of the irregularly shaped embedding holes 2 have narrow slots for inserting conductive sheets 3.

[0029] The conductive sheet 3 is made of stainless steel with a thickness of 0.2mm. The exposed end of the conductive sheet 3 is welded with a wire ring for hanging the metal hook of the root measuring instrument. The insertion end of the conductive sheet 3 is polished smooth to ensure that it can be freely inserted and removed through the narrow slot, and the surface of the conductive sheet 3 inserted into the embedding hole can contact the conductive paste. After the exercise is completed, the conductive sheet 3 can be completely pulled out from the narrow slot, so that the inside of the groove with the pyramidal structure becomes a flat space without dead corners, which greatly facilitates the physical cleaning of residual conductive paste and wax.

[0030] The irregular embedding hole 2 is filled with a double-layer embedding medium 4, which includes a bottom conductive paste and a top hot-melt wax liquid. The conductive paste is medical conductive gel, which wraps the root apex of the tooth for about 2 mm. The hot-melt wax liquid is medical paraffin with a melting point of 70℃. After the wax liquid cools, it forms a rigid support with a height that is flush with the neck of the adjacent tooth.

[0031] Example 2 This embodiment also provides a method for using an extracted tooth / model tooth root canal treatment teaching model with electrical testing function, including the following steps: Step S1: Model Preparation Insert the pluggable conductive sheet 3 into the narrow groove to the bottom of the irregular embedding hole 2, fill the bottom of the irregular embedding hole 2 with 3mm thick medical conductive gel and completely cover the surface of the conductive sheet 3. Step S2, Tooth embedding Immerse the apex of the tooth 2mm into medical conductive gel, inject 70℃ medical paraffin liquid into the irregular embedding hole 2 until it is flush with the neck of the adjacent tooth, and let it stand for 5-10 minutes to cool and solidify. Step S3: Root canal treatment training The dental model base 1 is fixed to the simulated human head model by the bottom magnetic snap-fit. The tooth is isolated by a rubber dam. The pulp chamber is opened, explored, and the root canal is opened. The metal hook of the root measuring instrument is hung on the wiring ring of the conductive sheet 3. The other electrode of the root measuring instrument is clamped to the root canal stub and inserted into the root canal of the tooth to conduct root canal length measurement training and complete the root canal treatment training.

[0032] Step S4: Disassembly and cleaning Disassemble and clean the tooth model base 1. Place it in a 60℃ warm water bath for 5 minutes to melt the paraffin. Remove the tooth and pull out the conductive sheet 3. Use a brush and saline to thoroughly clean the irregular embedding hole 2. The removed extracted tooth / model tooth can be used to directly observe the root canal treatment results and take X-rays to confirm the completion of the root canal treatment.

[0033] Step S5, Reuse Repeat steps S1-S4 on the cleaned and dried dental arch model base 1 and conductive sheet 3 to carry out the next round of training.

[0034] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A teaching model for root canal treatment of extracted teeth / model teeth with electrical measurement function, characterized in that, It includes a dental arch model base (1), a special-shaped embedding hole (2), a pluggable conductive sheet (3), and a double-layer embedding medium (4). The irregular embedding hole (2) is a flat oval groove that is narrow at the top and wide at the bottom. It is opened at the preset tooth position of the dental arch model base (1). The side wall of the irregular embedding hole (2) is provided with a narrow groove. The conductive sheet (3) is inserted into the bottom of the groove of the irregular embedding hole (2) through the narrow groove. The bottom of the groove of the irregular embedding hole (2) is filled with conductive paste, and the conductive paste completely covers the insertion end of the conductive sheet (3). The double-layer embedding medium (4) is filled into the irregular embedding hole (2). The double-layer embedding medium (4) includes a bottom conductive paste and a top hot melt wax. The bottom conductive paste is used to wrap the root apex of the tooth. The top hot melt wax forms a rigid support after cooling, and the height of the cooled hot melt wax is flush with the neck of the tooth. The root apex of the tooth is immersed in the conductive paste. The hot melt wax is medical paraffin liquid. It is injected into the irregular embedding hole (2) until it is flush with the neck of the adjacent tooth. It is allowed to stand and cool before solidifying. The dental arch model base (1) is made of rigid insulating material. A magnetic buckle is installed at the bottom of the dental arch model base (1). The dental arch model base (1) can be detachably fixed to the oral cavity simulation human head model through the magnetic buckle. The conductive sheet (3) is provided with a connecting ring for mounting the metal hook of the root measuring instrument. The root canal of the tooth is adapted to be inserted into the root canal file. The metal hook of the root measuring instrument can be mounted on the connecting ring, and another electrode can be clamped on the handle of the root canal file to realize the root canal length measurement function. The top layer of hot melt wax can be melted by heating in a warm water bath. The conductive sheet (3) can be pulled out from the narrow groove of the irregular embedding hole (2). The irregular embedding hole (2) is adapted to be cleaned with a brush and saline solution. The dental model base (1) and the pluggable conductive sheet (3) are reusable.

2. The teaching model for extracted tooth / model tooth root canal treatment with electrical measurement function according to claim (1), characterized in that, The dental arch model base (1) is made of resin material by 3D printing. The dental arch model base (1) has the anatomical shape of the dental arch segment of the maxillary anterior teeth region of the human body. The magnetic buckle is adapted to the simulated human head model.

3. The teaching model for extracted tooth / model root canal treatment with electrical measurement function according to claim (1), characterized in that, The irregular embedding hole (2) is provided with a pyramidal structure at the four corners of the groove bottom. The irregular embedding hole (2) is opened in the tooth position of the anterior tooth, premolar and molar area of ​​the dental arch model base (1).

4. The extracted tooth / model tooth root canal treatment teaching model supporting electrical testing function according to claim (1), characterized in that, The conductive sheet (3) is a stainless steel sheet with a thickness of 0.2 mm. The conductive sheet (3) extends to the bottom of the groove of the irregular embedding hole (2), is polished smooth, and comes into contact with the conductive paste. The conductive sheet (3) can be completely pulled out from the narrow groove, so that a flat space without dead angles is formed inside the irregular embedding hole (2).

5. The teaching model for extracted tooth / model root canal treatment with electrical measurement function according to claim (1), characterized in that, The conductive paste at the bottom layer of the double-layer embedding medium (4) is a medical conductive gel. The medical conductive gel fills the bottom of the irregular embedding hole (2) with a thickness of 3 mm and completely covers the conductive sheet (3) extending to one end of the bottom of the groove. The length of the medical conductive gel wrapping the root apex of the tooth is 2 mm.

6. The extracted tooth / model tooth root canal treatment teaching model supporting electrical testing function according to claim (1), characterized in that, The top layer of the double-layer embedding medium (4) is a hot-melt wax liquid for medical use. The melting point of the medical wax is 70°C. The temperature at which the wax is heated and injected into the irregular embedding hole (2) is 70°C. The height of the medical wax after cooling is flush with the neck of the adjacent tooth.

7. The teaching model for extracted tooth / model tooth root canal treatment with electrical measurement function according to claim (1), characterized in that, The tooth positions of the anterior teeth, premolars and molars on the dental arch model base (1) are each independently provided with a special-shaped embedding hole (2), and each special-shaped embedding hole (2) is separately equipped with a pluggable conductive sheet (3) and a double-layer embedding medium (4), so that the training operations of each tooth position do not interfere with each other.

8. The teaching model for extracted tooth / model tooth root canal treatment with electrical measurement function according to claim (2), characterized in that, The resin material used in the dental arch model base (1) is a dental model 3D printing material. The dental arch model base (1) made by 3D printing is matched with the anatomical structure of the maxillary anterior tooth region of the human body in a 1:1 ratio.

9. The teaching model for extracted tooth / model tooth root canal treatment with electrical measurement function according to claim (4), characterized in that, The conductive connection part of the conductive sheet (3) is a metal wire ring, which is adapted to the metal hook of the clinical routine root canal length measuring instrument and forms a conductive closed circuit with the conductive sheet (3) and conductive paste.

10. A method of using an extracted tooth / model tooth root canal treatment teaching model with electrical testing function as described in any one of claims 1-9, characterized in that, Includes the following steps: Step S1: Model preparation. Insert the pluggable conductive sheet (3) into the narrow groove to the bottom of the irregular embedding hole (2). Fill the bottom of the irregular embedding hole (2) with 3mm thick medical conductive gel and completely cover the surface of the conductive sheet (3). Step S2: Tooth embedding. Immerse the tooth root tip 2mm into medical conductive gel, inject 70℃ medical paraffin liquid into the irregular embedding hole (2) until it is flush with the neck of the adjacent tooth, and let it stand for 5-10 minutes to cool and solidify. Step S3: Root canal treatment training. Fix the dental model base (1) to the simulated human head model through the bottom magnetic snap fastener, isolate the tooth with a rubber dam, open the pulp chamber, explore and root canal the tooth, hang the metal hook of the root measuring instrument on the wiring ring of the conductive sheet (3), clamp the other electrode of the root measuring instrument on the root canal file handle, insert it into the root canal of the tooth to perform root canal length measurement training, and complete the root canal treatment training. Step S4: Disassembly and cleaning. Place the dental arch model base (1) in a 60°C warm water bath and heat for 5 minutes to melt the paraffin. Remove the tooth and pull out the conductive sheet (3). Use a brush and saline solution to clean the irregular embedding hole thoroughly. The removed tooth can be used to directly observe the root canal treatment results and take X-rays to confirm the completion of the root canal treatment. Step S5: Repeat the operation of cleaning and drying the dental arch model base (1) and conductive sheet (3) according to steps S1-S4 to carry out the next round of training.

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