Multi-layered dental caries with pulp chamber and its fabrication method

Abstract

This invention discloses a multi-layered tooth with a carious pulp chamber and its fabrication method. The method involves sequentially molding a simulated dentin crown with an upper pulp chamber, a simulated enamel with a caries-receiving groove covering the outer side of the simulated dentin crown, and a simulated caries portion within the caries-receiving groove through multiple in-mold injection molding processes. A simulated dentin root with a lower pulp chamber and simulated root canals is then formed by injection molding or 3D printing. The inner walls of the upper and lower pulp chambers and the simulated root canals are coated with simulated pulp dye. The simulated pulp is then placed into the lower pulp chamber and the simulated root canal. The simulated crown is then fixed to the upper end of the simulated dentin root by bonding or welding to form the simulated tooth. This invention's simulated tooth has a caries-like structure and reproduces the anatomical morphology of a real tooth, which helps improve students' clinical experience during practical training. The highly realistic tooth model of this invention can be used to explain different course content, improving teachers' teaching efficiency.

Description

Technical Field

[0001] This invention relates to an oral cavity model, and more particularly to a carious multi-layered tooth with pulp cavity and its fabrication method. Background Technology

[0002] If a tooth develops cavities, the dentist needs to perform a cavity removal procedure. If it's a superficial cavity, where the decay hasn't reached the pulp chamber, then simply removing the decay is sufficient. If it's a deep cavity, where the decay has entered the pulp chamber, in addition to removing the decay, root canal treatment is also necessary.

[0003] The existing dental materials used for internships are single-layered, lack pulp cavities, and do not represent the anatomical form of teeth. Furthermore, the hardness of these teeth is only a single hardness, which cannot effectively simulate the multi-layered materials such as caries, dentin, and pulp cavities.

[0004] During clinical simulation teaching internships, students perform dental restoration procedures on existing practice teeth. Because these teeth are healthy (without decay), it's impossible to perform real caries removal or root canal treatments. This prevents students from effectively learning and experiencing the proper techniques in a real clinical setting. Summary of the Invention

[0005] To overcome the above-mentioned defects, the present invention provides a multi-layered tooth with pulp chamber and a method for fabricating the same. The multi-layered tooth with pulp chamber has a carious structure that simulates the decay of a carious tooth and reproduces the real anatomical shape of a tooth, which is beneficial to improving students' clinical experience during practical training.

[0006] The technical solution adopted by this invention to solve its technical problem is: a multi-layered tooth with a carious pulp chamber, comprising simulated enamel, simulated dentin crown, simulated dentin root, and simulated pulp, wherein the crown direction is upward and the root direction is downward. A caries-receiving groove is formed on the surface of the simulated enamel, and a simulated caries portion simulating tooth caries is fixedly disposed within the caries-receiving groove. The simulated enamel is fixedly covering the outer side of the simulated dentin crown to form a simulated crown. A superior pulp chamber with an opening at the lower end is formed within the simulated dentin crown. The simulated dentin root... The device contains a lower pulp chamber with an upper opening and a simulated root canal. The upper end of the simulated root canal is connected to the lower pulp chamber. The simulated dentin crown can be fixedly covered on the upper end of the simulated dentin root. The lower pulp chamber and the upper pulp chamber are directly opposite each other and connected to form a simulated pulp chamber. The bottom surface of the upper pulp chamber forms the pulp chamber roof, and the bottom surface of the lower pulp chamber forms the pulp chamber floor. The root canal orifice of the simulated root canal is located on the pulp chamber floor. The top surface of the pulp chamber, the bottom surface of the pulp chamber, and the inside of the simulated root canal are all provided with simulated pulp dye. The simulated pulp made of soft material fills the simulated pulp chamber and the simulated root canal.

[0007] As a further improvement of the present invention, the simulated caries portion provided in the caries containment groove is a simulated shallow caries morphology, a simulated medium caries morphology, or a simulated deep caries morphology.

[0008] As a further improvement of the present invention, the simulated caries part is made of resin material similar to that of caries teeth through injection molding, and the color of the simulated caries part is black; the simulated enamel is made of ultra-hard resin material through injection molding, and the color of the simulated enamel is white, close to that of real tooth enamel; the simulated dentin root and the simulated dentin crown are both made of material close to that of natural dentin through injection molding, and the color of the simulated dentin crown is light yellow, close to that of real dentin; the bottom surface of the upper pulp chamber of the simulated dentin crown forms the shape of the pulp chamber roof and pulp horn; and the simulated dentin root material is transparent.

[0009] As a further improvement of the present invention, the simulated caries part is made of 65%-75% thermosetting melamine resin material, 10%-15% calcium carbonate filler and 15-20% thermoplastic fiber material by weight percentage.

[0010] As a further improvement of the present invention, the simulated enamel is injection molded onto the outer side of the simulated dentin crown by in-mold injection molding, and the simulated caries portion is injection molded onto the simulated enamel by in-mold injection molding.

[0011] As a further improvement of the present invention, the simulated dentin root is made by 3D printing process, the simulated root canal inside the simulated dentin root is a complex curved root canal, and the root apex of the simulated pulp is a real anatomical shape that matches the simulated root canal.

[0012] As a further improvement of the present invention, the simulated dentin root is formed by injection molding, the simulated root canal inside the simulated dentin root is a standard single straight root canal, and the apex of the simulated dental pulp is a straight-through shape.

[0013] As a further improvement of the present invention, the simulated dentin root is made of heat-resistant and wear-resistant material, the root canal orifice of the simulated root canal has a minimum fineness of 0.2 mm, and the simulated root canal forms a single-root, double-root, triple-root, or multi-root shape that matches the tooth position number. The simulated pulp is a single-pulp root apex shape, double-pulp root apex shape, triple-pulp root apex shape, or multi-pulp root apex shape that matches the shape of the simulated root canal.

[0014] A method for fabricating a multi-layered tooth with a carious pulp cavity includes the following steps:

[0015] Step 1: Using a material that closely resembles natural dentin, a simulated dentin crown is injection molded;

[0016] Step 2: Place the injection-molded simulated dentin crown into a simulated enamel mold with a caries morphology. Use ultra-hard resin material to integrally mold simulated enamel with caries-accommodating grooves on the outside of the simulated dentin crown using in-mold injection molding.

[0017] Step 3: Place the simulated dentin crown and the simulated enamel integral molded part into the caries mold, and use a resin material similar to that of a caries tooth to integrally injection mold the simulated caries part in the caries receiving groove on the surface of the simulated enamel to form a crown with caries.

[0018] Step 4: Using a material that closely resembles natural dentin, a simulated dentin root is created through injection molding or 3D printing;

[0019] Step 5: Using a simulated dental pulp material, a simulated dental pulp mold is formed to create a realistic dental pulp.

[0020] Step Six: Use red pulp chamber staining material to stain the upper pulp chamber in the simulated dentin crown, the lower pulp chamber in the simulated dentin root, and the inner wall of the simulated root canal;

[0021] Step 7: Insert the simulated dental pulp completely into the root of the simulated dentin;

[0022] Step 8: Place the decayed crown on top of the simulated dentin root with the simulated pulp inserted, and glue the decayed crown and simulated dentin root together, or use ultrasonic welding to weld the decayed crown and simulated dentin root together, thus completing the fabrication of the decayed simulated tooth.

[0023] A method for fabricating a multi-layered tooth with a carious pulp cavity includes the following steps:

[0024] Step 1: Using a material that closely resembles natural dentin, a simulated dentin crown is injection molded;

[0025] Step 2: Place the injection-molded simulated dentin crown into a simulated enamel mold with a caries morphology. Use ultra-hard resin material to integrally mold simulated enamel with caries-accommodating grooves on the outside of the simulated dentin crown using in-mold injection molding.

[0026] Step 3: Place the simulated dentin crown and the simulated enamel integral molded part into the caries mold, and use a resin material similar to that of a carious tooth to integrally injection mold the simulated caries part into the caries-containing groove on the surface of the simulated enamel to form a crown with caries;

[0027] Step 4: Using a material that closely resembles natural dentin, a simulated dentin root is created through injection molding or 3D printing;

[0028] Step 5: Use red pulp chamber staining material to stain the upper pulp chamber in the simulated dentin crown, the lower pulp chamber in the simulated dentin root, and the inner wall of the simulated root canal;

[0029] Step Six: Fill the lower pulp chamber and simulated root canal of the simulated dentin root with soft gel material to form simulated dental pulp;

[0030] Step 7: The pulp cap component is molded using a material that closely resembles natural dentin through injection molding;

[0031] Step 8: Attach the pulp cap component to the top of the simulated dentin root, covering the simulated pulp made of soft gel material;

[0032] Step 9: Place the decayed crown on top of the simulated dentin root with the pulp cap component installed, and glue the decayed crown and simulated dentin root together, or use ultrasonic welding to weld the decayed crown and simulated dentin root together, thus completing the fabrication of the decayed simulated tooth.

[0033] The beneficial effects of this invention are as follows: By forming a caries-receiving groove on the surface of simulated tooth enamel, and fixing a simulated caries portion within the cavity, the product becomes more clinically realistic. It can reproduce the caries state of a real patient, facilitating school teaching and student understanding of teeth. More importantly, it allows for practical training in clinical settings, enabling caries removal procedures. The simulated crown realistically reproduces the difference between the enamel and dentin interface, allowing students to truly experience the feel of tooth preparation during the grinding process and to realistically feel the preparation of various clinical cavity types. Simultaneously, the simulated dentin root can simulate the root canal treatment procedure after pulp exposure during practical training. It can reproduce the practical training procedures of pulp extraction and root canal treatment. This allows teachers to use the highly realistic tooth model of this invention to explain different course content, improving teaching efficiency. Most importantly, it provides students with the most realistic practical training experience. This invention utilizes a multi-injection molding process to form a multi-layered tooth structure, which improves production efficiency compared to traditional bonding processes. Simultaneously, it enhances the bonding strength between materials, reduces gaps between materials, and allows for smoother cutting. Simultaneously, the use of transparent materials for 3D printing to simulate dentin tooth roots enables the successful production of complex root canals, solving the technical difficulties of traditional casting or injection molding processes due to the difficulty in forming undercut structures. Furthermore, because the material is transparent, instructors can effectively evaluate the effectiveness of root canal treatments, making the guidance for teaching more visual and digitized. Attached Figure Description

[0034] Figure 1 This is a front view illustrating the principle of the first multi-layered tooth structure of the present invention;

[0035] Figure 2 This is an exploded view of the first type of multi-layered tooth according to the present invention;

[0036] Figure 3 This is an exploded view of the principle of the first multi-layer tooth structure of the present invention;

[0037] Figure 4 This is a front view illustrating the principle of the second multi-layered tooth structure of the present invention;

[0038] Figure 5 This is an exploded view of the second type of multi-layered tooth according to the present invention;

[0039] Figure 6 This is an exploded view of the principle of the second multi-layer tooth structure of the present invention;

[0040] Figure 7 This is a front view illustrating the principle of the third multi-layered tooth structure of the present invention;

[0041] Figure 8 This is a third exploded view of the multi-layered tooth structure according to the present invention;

[0042] Figure 9 This is an exploded view of the principle of the third multi-layer tooth structure of the present invention;

[0043] Figure 10 This is a front view illustrating the principle of the fourth multi-layered tooth structure of the present invention;

[0044] Figure 11 This is an exploded view of the fourth type of multi-layered tooth according to the present invention;

[0045] Figure 12 This is an exploded view of the fourth multi-layer tooth structure principle of the present invention;

[0046] Figure 13 This is a front view of the simulated dentin crown of the present invention;

[0047] Figure 14 This is a diagram showing the injection molding state of the simulated tooth enamel in the outer mold of the simulated dentin crown according to the present invention;

[0048] Figure 15 This is a diagram showing the state of the simulated caries part of the present invention being injection molded in the caries-receiving groove of simulated tooth enamel.

[0049] Figure 16 This is a front view illustrating the structural principle of the three curved root canals of the simulated dentin root of the present invention.

[0050] Figure 17 This is a front view of a simulated dental pulp with the actual anatomical morphology of the three-pulp root apex of the present invention.

[0051] Figure 18This is a diagram showing the state of the simulated dental pulp, with its actual anatomical morphology, being inserted into the simulated dentin root of the present invention.

[0052] Figure 19 This is a diagram showing the completed assembly state of the fourth multi-layer tooth structure of the present invention;

[0053] Figure 20 This is a front view illustrating the structural principle of the three straight root canals of the simulated dentin root of the present invention.

[0054] Figure 21 This is a front view of a simulated dental pulp with a true straight-through morphology of the three-pulp root apex of the present invention.

[0055] Figure 22 This is a diagram showing the state of the simulated dental pulp in its straight-through form being inserted into the simulated dentin root of the present invention.

[0056] Figure 23 This is a diagram showing the completed assembly state of the third type of multi-layer tooth structure of the present invention;

[0057] Figure 24 This is a perspective view of the simulated tooth anatomy based on the true anatomical morphology of the three pulp root apex of the present invention.

[0058] Figure 25 This is an exploded view of the simulated tooth anatomical morphology based on the true anatomical morphology of the three-pulp root apex of the present invention.

[0059] Figure 26 This is a perspective exploded view of the simulated tooth anatomy based on the true anatomical morphology of the three pulp root apex of the present invention.

[0060] Figure 27 This is a perspective view of the simulated tooth anatomy of the single-pulp root apex according to the present invention.

[0061] Figure 28 This is an exploded view of the simulated tooth anatomy based on the true anatomical morphology of the single-pulp root apex of the present invention.

[0062] Figure 29 This is a perspective exploded view of the simulated tooth anatomy based on the true anatomical morphology of the single-pulp root apex of the present invention. Detailed Implementation

[0063] Example: A multi-layered dental pulp chamber for dental caries, comprising simulated enamel 1, simulated dentin crown 2, simulated dentin root 3, and simulated dental pulp 4, with the crown direction upward and the root direction downward. A caries-receiving groove 11 is formed on the surface of the simulated enamel 1, and a simulated caries portion 5 simulating tooth caries is fixed within the caries-receiving groove. The simulated enamel 1 is fixedly covering the outer side of the simulated dentin crown 2 to form a simulated crown 10. A superior pulp chamber 21 with a lower opening is formed within the simulated dentin crown 2, and a inferior pulp chamber 31 with a superior opening and a simulated root canal 32 are formed within the simulated dentin root 3. The upper end of the simulated root canal 32 is connected to the lower pulp chamber 31. The simulated dentin crown 2 can be fixedly covered on the upper end of the simulated dentin root 3. The lower pulp chamber 31 and the upper pulp chamber 21 are directly connected and spliced ​​together to form a simulated pulp chamber 4. The bottom surface of the upper pulp chamber 21 forms the pulp chamber roof 211, and the bottom surface of the lower pulp chamber 31 forms the pulp chamber floor 311. The root canal orifice of the simulated root canal 32 is located on the pulp chamber floor 311. The surface of the pulp chamber roof 211, the surface of the pulp chamber floor 311, and the inside of the simulated root canal 32 are all provided with simulated pulp 4 dye. The simulated pulp 4 made of soft material is filled in the simulated pulp chamber 4 and the simulated root canal 32.

[0064] The tooth model forms a multi-layered tooth structure based on the real tooth structure. Simulated enamel 1 is composited on the outer side of the simulated dentin crown 2 to form a simulated crown 10. The simulated dentin crown 2 is combined with the simulated dentin root 3 to form simulated dentin with a pulp chamber and simulated root canal 32. The inner walls of the simulated pulp chamber 4 and simulated root canal 32 are coated with red pulp dye to simulate the inner surface of the real pulp chamber and root canal. The simulated pulp 4 fills the simulated pulp chamber 4 and simulated root canal 32 and can be used for pulp extraction training. A simulated caries part 5 is integrally formed on the simulated enamel 1 to simulate a carious tooth and can be used for caries removal training.

[0065] This tooth model can simulate tooth decay, enamel, and dentin, reproducing the realistic anatomical shape of a tooth, facilitating school teaching and student learning about teeth. More importantly, it allows for practical training in clinical settings, enabling students to perform caries removal procedures. The simulated dentin crown realistically reproduces the difference between the enamel and dentin boundary, allowing students to experience the feel of tooth preparation during the molar process and the tactile sensation of preparing various clinical cavity types. Simultaneously, the root portion can simulate root canal treatment after pulp exposure during practical training, reproducing the practical procedures of pulp extraction and root canal treatment. This allows teachers to use this type of tooth to explain different course content, improving teaching efficiency, and most importantly, providing students with the most realistic practical training experience.

[0066] The simulated caries section 5, located within the caries-receiving slot 11, simulates the morphology of superficial caries, moderate caries, or deep caries. Depending on the degree of caries, different depths of caries can be created on different tooth models during the design process, facilitating students' understanding of different caries levels and enabling caries removal procedures tailored to varying degrees of caries.

[0067] The simulated decayed portion 5 is made of resin material similar to that of a decayed tooth, injection molded, and is black in color. The simulated enamel 1 is made of ultra-hard resin material, injection molded, and is white in color, similar to that of real tooth enamel. The simulated dentin root portion 3 and the simulated dentin crown portion 2 are both made of materials similar to natural dentin, injection molded. The simulated dentin crown portion 2 is light yellow in color, similar to that of real dentin. The bottom surface of the upper pulp chamber 21 of the simulated dentin crown portion 2 forms a pulp chamber roof 211 and a pulp horn 212. The simulated dentin root portion 3 is made of transparent material. All parts are made of materials similar to those of real teeth, which can fully simulate the hardness and shape of different positions of real teeth, making the model tooth more realistic. The simulated dentin crown portion 2 is made of a material close to the texture of natural dentin, and is exactly the same material used for the dentin root portion. To distinguish between the enamel (crown) and the simulated dentin root 3, the simulated dentin crown 2 is a light yellow color close to that of real dentin. Simultaneously, the pulp chamber roof 211 of the inferior superior pulp chamber 21 is reproduced, along with the morphology of the pulp horn 212. Transparent material is optimally chosen for the dentin root, allowing instructors to effectively evaluate the treatment's effectiveness after root canal treatment, thus visualizing and digitizing the teaching guidance. Materials selected for each part can also be customized as needed.

[0068] According to the mass percentage, the simulated carious part 5 is made of 65%-75% thermosetting melamine resin, 10%-15% calcium carbonate filler, and 15%-20% thermoplastic fiber. The hardness and mechanical properties of this material conform to the morphology of carious teeth, which is helpful for grinding and scraping during the teaching process.

[0069] The simulated enamel 1 is injection molded onto the outer side of the simulated dentin crown 2 using in-mold injection molding. The simulated carious portion 5 is also injection molded onto the simulated enamel 1 using in-mold injection molding. This in-mold injection molding process ensures that the enamel is integrally molded onto the outer side of the simulated dentin crown 2, and that the simulated carious portion 5 is integrally molded onto the surface of the simulated enamel 1. The three components are firmly bonded together without gaps, resulting in a more realistic appearance.

[0070] The simulated dentin root portion 3 is manufactured using 3D printing technology. The simulated root canal 32 within the simulated dentin root portion 3 is a complex, curved root canal. The apex of the simulated pulp 4 has a realistic anatomical shape that matches the simulated root canal 32. The simulated dentin root portion 3, using 3D printing technology, can be used to create simulated root canals 32 with anatomical shapes. It utilizes resin materials that match dentin material and can be customized. The root canal orifice is fully open, facilitating root canal treatment. The root canal contains pulp, and the root canal walls are stained red, further aiding in root canal treatment. Correspondingly, the pulp chamber roof 211, pulp chamber floor 311, pulp horn 212, and root canal orifice of the simulated pulp 4 simulate the shape of a real tooth, while the apex conforms to real anatomy. The material used is a soft material that simulates the shape of the pulp, realistically reproducing the process of removing the entire pulp during pulpectomy.

[0071] The simulated dentin root portion 3 is formed using injection molding. The simulated root canal 32 within the simulated dentin root portion 3 is a standard-shaped single straight root canal, and the apex of the simulated dental pulp 4 is a straight-through shape. The simulated dentin root portion 3 is formed using injection molding, and a resin material that matches dentin is selected. The root canal shape is straight, which is beneficial for mass injection molding production. At the same time, the root canal orifice is completely open, which is convenient for users to perform root canal treatment operations. There is dental pulp inside the root canal, and the root canal wall is stained red, which is convenient for users to perform root canal treatment operations. Correspondingly, the pulp chamber roof 211, pulp chamber floor 311, pulp horn 212, and root canal orifice of the simulated dental pulp 4 simulate the shape of a real tooth. The apex is limited by the shape of a single straight root tooth and the processing technology, and adopts a straight-through shape. The material used is a soft material that simulates the shape of dental pulp, which can realistically reproduce the operation of removing the entire dental pulp during pulpectomy.

[0072] The simulated dentin root portion 3 is made of heat- and wear-resistant material. The simulated root canal 32 has a minimum orifice diameter of 0.2 mm. The simulated root canal 32 forms a single-root, double-root, triple-root, or multi-root shape that matches the tooth position number. The simulated pulp 4 has a root apex shape that matches the shape of the simulated root canal 32, and can be a single-pulp, double-pulp, triple-pulp, or multi-pulp root apex shape. The simulated dentin root portion 3 is made of heat- and wear-resistant material, which facilitates users to practice root canal enlargement and root canal filling operations. The minimum orifice diameter of 0.2 mm can reproduce the fineness of the root canal orifice in clinical teeth.

[0073] A method for fabricating a multi-layered tooth with a carious pulp cavity includes the following steps:

[0074] Step 1: Using a material that closely resembles natural dentin, a simulated dentin crown 2 is injection molded. The material that closely resembles natural dentin is injected into a mold with the shape of the simulated dentin crown 2 and then injection molded.

[0075] Step 2: Place the injection-molded simulated dentin crown 2 into the simulated enamel 1 mold with a caries morphology. Using ultra-hard resin material, the simulated enamel 1 with a caries-accommodating groove 11 is integrally molded on the outside of the simulated dentin crown 2 through in-mold injection molding. Design and manufacture a crown mold according to the crown morphology with caries morphology. Place the simulated dentin crown 2 into the crown mold, and then use ultra-hard resin material to injection mold it to obtain a simulated crown with a caries-accommodating groove 11.

[0076] Step 3: Place the simulated dentin crown 2 and simulated enamel 1 into the decay mold. Use a resin material similar to that of a carious tooth to integrally injection mold the simulated carious part 5 in the decay receiving groove 11 on the surface of the simulated enamel 1 to form a crown with decay. Design and manufacture the decay mold according to the decay morphology. Then place the simulated crown with the decay receiving groove 11 into the decay mold, inject a resin material similar to that of a carious tooth, and injection mold the simulated carious part 5 to complete the upper crown with decay.

[0077] Step 4: Using a material that closely resembles natural dentin, a simulated dentin root 3 is fabricated by injection molding or 3D printing. The molding method of the simulated dentin root 3 is selected according to the morphology of the simulated root canal 32 inside the simulated dentin root 3. When using injection molding, a dentin root mold is designed and fabricated according to the morphology of the dentin root. The material that closely resembles natural dentin is injected into the dentin root mold for injection molding.

[0078] Step 5: Using a simulated dental pulp material, a simulated dental pulp 4 is formed through a simulated dental pulp mold. The simulated dental pulp 4 can be formed in the mold using soft rubber material, such as injecting soft rubber into the mold cavity. After the soft rubber solidifies, it forms a soft simulated dental pulp 4.

[0079] Step 6: Use red pulp chamber staining material to stain the inner walls of the upper pulp chamber 21 in the simulated dentin crown 2, the lower pulp chamber 31 in the simulated dentin root 3, and the simulated root canal 32;

[0080] Step 7: Insert the simulated dental pulp 4 completely into the simulated dentin root 3;

[0081] Step 8: Place the decayed crown on the upper end of the simulated dentin root 3 with the simulated pulp 4 inserted, and use glue to bond and fix the decayed crown and the simulated dentin root 3, or use ultrasonic welding to weld and fix the decayed crown and the simulated dentin root 3 to complete the fabrication of the decayed simulated tooth.

[0082] A method for fabricating a multi-layered tooth with a carious pulp cavity includes the following steps:

[0083] Step 1: Using a material that closely resembles natural dentin, a simulated dentin crown is injection molded 2;

[0084] Step 2: Place the injection-molded simulated dentin crown 2 into the mold of simulated enamel 1 with caries morphology, and use ultra-hard resin material to integrally mold the simulated enamel 1 with caries receiving groove 11 on the outside of the simulated dentin crown 2.

[0085] Step 3: Place the simulated dentin crown 2 and simulated enamel 1 into the decay mold, and use a resin material similar to that of a carious tooth to integrally injection mold the simulated carious part 5 into the decay receiving groove 11 on the surface of the simulated enamel 1 to form a crown with decay;

[0086] Step 4: Using a material that closely resembles natural dentin, a simulated dentin root is fabricated through injection molding or 3D printing.

[0087] Step 5: Use red pulp chamber staining material to stain the inner walls of the superior pulp chamber 21 in the simulated dentin crown 2, the inferior pulp chamber 31 in the simulated dentin root 3, and the simulated root canal 32;

[0088] Step 6: Fill the lower pulp chamber 31 and simulated root canal 32 of the simulated dentin root 3 with soft gel material to form simulated pulp 4. Directly flush the gel into the lower pulp chamber 31 and simulated root canal 32 of the simulated dentin root 3 to form simulated pulp 4.

[0089] Step 7: The pulp cap component is molded using a material that closely resembles natural dentin through injection molding;

[0090] Step 8: Attach the pulp cap component to the top of the simulated dentin root 3, covering the simulated dental pulp 4 made of soft gel material. The pulp cap component covers the top of the simulated dentin root 3 to block and protect the gel.

[0091] Step 9: Place the decayed crown on the upper end of the simulated dentin root 3 with the pulp cap component installed, and use glue to bond and fix the decayed crown and simulated dentin root 3, or use ultrasonic welding to weld and fix the decayed crown and simulated dentin root 3, thus completing the fabrication of the decayed simulated tooth.

Claims

1. A carious pulp chamber multilayer tooth comprising a simulated tooth enamel (1), a simulated tooth dentin coronal part (2), a simulated tooth dentin radicular part (3) and a simulated tooth pulp (4), characterized in that: Assuming the crown direction is upward and the root direction is downward, a caries-receiving groove (11) is formed on the surface of the simulated enamel. A simulated caries portion (5) simulating tooth caries is fixedly arranged within the caries-receiving groove. The simulated enamel is fixedly covered on the outside of the simulated dentin crown to form a simulated crown (10). A superior pulp chamber (21) with an opening at the lower end is formed within the simulated dentin crown. A inferior pulp chamber (31) with an opening at the upper end and a simulated root canal (32) are formed within the simulated dentin root. The upper end is connected to the lower pulp chamber. The simulated dentin crown can be fixedly covered on the upper end of the simulated dentin root. The lower pulp chamber and the upper pulp chamber are directly connected and spliced ​​together to form a simulated pulp chamber. The bottom surface of the upper pulp chamber forms the pulp chamber roof (211), and the bottom surface of the lower pulp chamber forms the pulp chamber floor (311). The root canal orifice of the simulated root canal is located on the pulp chamber floor. The pulp chamber roof surface, pulp chamber floor surface and simulated root canal are all provided with simulated pulp dye. The simulated pulp made of soft material fills the simulated pulp chamber and simulated root canal.

2. The carious multi-layered pulp cavity tooth according to claim 1, characterized in that: The simulated caries portion placed in the caries containment slot is a simulated shallow caries morphology, a simulated medium caries morphology, or a simulated deep caries morphology.

3. The carious multi-layered pulp cavity tooth according to claim 1, characterized in that: The simulated caries part is made of resin material similar to that of caries through injection molding, and the color of the simulated caries part is black; the simulated enamel is made of ultra-hard resin material through injection molding, and the color of the simulated enamel is white, which is close to that of real tooth enamel; the simulated dentin root and simulated dentin crown are both made of material close to that of natural dentin through injection molding, and the color of the simulated dentin crown is light yellow, which is close to that of real dentin. The bottom surface of the upper pulp chamber of the simulated dentin crown forms the shape of the pulp chamber roof and pulp horn (212), and the material of the simulated dentin root is transparent.

4. The carious multi-layered pulp cavity tooth according to claim 3, characterized in that: The simulated caries portion is made of 65%-75% thermosetting melamine resin, 10%-15% calcium carbonate filler, and 15%-20% thermoplastic fiber, calculated by weight percentage.

5. The carious multi-layered pulp cavity tooth according to claim 3, characterized in that: The simulated enamel is injection molded onto the outer side of the simulated dentin crown by in-mold injection molding, and the simulated caries portion is injection molded onto the simulated enamel by in-mold injection molding.

6. The carious multi-layered pulp cavity tooth according to claim 1, characterized in that: The simulated dentin root is made using 3D printing technology. The simulated root canals inside the simulated dentin root are complex curved root canals, and the root apex of the simulated dental pulp is a real anatomical shape that matches the simulated root canal.

7. The carious multi-layered pulp cavity tooth according to claim 1, characterized in that: The simulated dentin root is formed by injection molding. The simulated root canal inside the simulated dentin root is a standard single straight root canal, and the simulated dental pulp has a straight apex.

8. The carious multi-layered pulp cavity tooth according to claim 1, characterized in that: The simulated dentin root is made of heat-resistant and wear-resistant material. The minimum diameter of the simulated root canal orifice is 0.2 mm. The simulated root canal forms a single-root, double-root, triple-root, or multi-root shape that matches the tooth position number. The simulated pulp forms a single-pulp, double-pulp, triple-pulp, or multi-pulp root apex shape that matches the simulated root canal shape.

9. A method for fabricating a multi-layered dental pulp cavity according to any one of claims 1-8, characterized in that: Includes the following steps: Step 1: Using a material that closely resembles natural dentin, a simulated dentin crown is injection molded; Step 2: Place the injection-molded simulated dentin crown into a simulated enamel mold with a caries morphology. Use ultra-hard resin material to integrally mold simulated enamel with caries-accommodating grooves on the outside of the simulated dentin crown using in-mold injection molding. Step 3: Place the simulated dentin crown and the simulated enamel integral molded part into the caries mold, and use a resin material similar to that of a caries tooth to integrally injection mold the simulated caries part in the caries receiving groove on the surface of the simulated enamel to form a crown with caries. Step 4: Using a material that closely resembles natural dentin, a simulated dentin root is created through injection molding or 3D printing; Step 5: Using a simulated dental pulp material, a simulated dental pulp mold is formed to create a realistic dental pulp. Step Six: Use red pulp chamber staining material to stain the upper pulp chamber in the simulated dentin crown, the lower pulp chamber in the simulated dentin root, and the inner wall of the simulated root canal; Step 7: Insert the simulated dental pulp completely into the root of the simulated dentin; Step 8: Place the decayed crown on top of the simulated dentin root with the simulated pulp inserted, and glue the decayed crown and simulated dentin root together, or use ultrasonic welding to weld the decayed crown and simulated dentin root together, thus completing the fabrication of the decayed simulated tooth.

10. A method for fabricating a multi-layered dental pulp cavity according to any one of claims 1-8, characterized in that: Includes the following steps: Step 1: Using a material that closely resembles natural dentin, a simulated dentin crown is injection molded; Step 2: Place the injection-molded simulated dentin crown into a simulated enamel mold with a caries morphology. Use ultra-hard resin material to integrally mold simulated enamel with caries-accommodating grooves on the outside of the simulated dentin crown using in-mold injection molding. Step 3: Place the simulated dentin crown and the simulated enamel integral molded part into the caries mold, and use a resin material similar to that of a carious tooth to integrally injection mold the simulated caries part into the caries-containing groove on the surface of the simulated enamel to form a crown with caries; Step 4: Using a material that closely resembles natural dentin, a simulated dentin root is created through injection molding or 3D printing; Step 5: Use red pulp chamber staining material to stain the upper pulp chamber in the simulated dentin crown, the lower pulp chamber in the simulated dentin root, and the inner wall of the simulated root canal; Step Six: Fill the lower pulp chamber and simulated root canal of the simulated dentin root with soft gel material to form simulated dental pulp; Step 7: The pulp cap component is molded using a material that closely resembles natural dentin through injection molding; Step 8: Attach the pulp cap component to the top of the simulated dentin root, covering the simulated pulp made of soft gel material; Step 9: Place the decayed crown on top of the simulated dentin root with the pulp cap component installed, and glue the decayed crown and simulated dentin root together, or use ultrasonic welding to weld the decayed crown and simulated dentin root together, thus completing the fabrication of the decayed simulated tooth.

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