Isolated tooth fixing device for simulating II-type hole treatment

Abstract

The invention relates to the technical field of oral medicine clinical treatment, in particular to an isolated tooth fixing device for simulating II-type hole treatment, which comprises a base, a cavity is formed in the top of the base, simulated gingiva are mounted on both sides of the base, a connecting material block for fixing an isolated tooth is mounted in the cavity of the base, and the connecting material block is used for fixing the isolated tooth. The dental crown part of the extracted tooth is exposed, the tooth root part is fixed in the connecting material block, a clamping assembly for fixing the connecting material block is mounted in the base, and a force control assembly which is bent to change the direction of the clamping assembly when the force for filling the extracted tooth with the material is too large is mounted in the cavity of the base; the force control assembly comprises a support. The problems that according to an existing isolated tooth fixing structure, it is difficult to arrange and fix a plurality of isolated teeth in a simulated oral cavity firmly, so that in-vitro II-type hole preparation and filling treatment are facilitated, the filling strength is limited in the treatment process, and the operation during II-type hole filling in the body of a patient is simulated are solved.

Description

Technical Field

[0001] The invention relates to the technical field of oral clinical treatment, in particular to an ex vivo tooth fixing device for simulating Class II cavity treatment. Background Art

[0002] Caries is the most common disease in the oral cavity. Due to its special anatomical position, the proximal surfaces of the posterior teeth are difficult to clean and have poor self-cleaning ability. They are prone to caries and progress quickly. Class II cavities refer to cavities prepared for the treatment of caries on the proximal surfaces of posterior teeth. The long-term success rate of Class II cavity fillings is often lower than that of other cavity types, which is related to the following factors: 1. The filling treatment of Class II cavities usually needs to be assisted by the proximal surface molding system. If the proximal surface molding system is not tight, it will affect the fit between the placed filling material and the tooth tissue, resulting in filling failure; 2. The posterior teeth play the role of crushing and grinding food during chewing movements. Class II cavities need to withstand relatively high temperatures after filling. Large chewing force is required, so materials with good mechanical properties such as compressive strength and wear resistance are needed for filling. However, the current materials with good compressive strength and wear resistance often have poor fluidity, making it difficult to effectively fill the fine points and corners between the adjacent molding system and the cavity. Bubbles are prone to occur, leading to filling failure. Therefore, a structure is needed that can firmly fix the ex vivo tooth, facilitate in vitro simulation of Class II cavity preparation and filling treatment, and limit the filling force during the filling process, simulate the operation of Class II cavity filling treatment in the patient's body, and provide assistance for the development and screening of instruments and materials for the treatment of Class II cavities. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides an in vitro tooth fixing device for simulating Class II cavity treatment, which solves the problem that the existing in vitro tooth fixing structure is difficult to arrange and fix multiple in vitro teeth firmly in a simulated oral cavity, thereby facilitating in vitro Class II cavity preparation and filling treatment, and limiting the filling force during the treatment process to simulate the operation of filling a Class II cavity in a patient's body.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an ex vivo tooth fixing device for simulating Class II cavity treatment, comprising a base, a chamber is opened on the top of the base, simulated gums are installed on both sides of the base, a connecting material block for fixing the ex vivo tooth is installed inside the chamber of the base, the crown part of the ex vivo tooth is exposed, and the root part is fixed inside the connecting material block, a clamping component for fixing the connecting material block is installed inside the base, and a force control component is installed inside the chamber of the base, which is bent to change the direction of the clamping component when the force applied to the ex vivo tooth filling material is too large;

[0005] The force control component includes a bracket fixed to the chamber of the base, one side of the bracket is rotatably connected to a swing frame, the top of the swing frame is fixedly connected to a support plate, the clamping component is installed on the support plate, and a limit component is installed between the bracket and the swing frame to prevent the swing frame from rotating relative to the bracket.

[0006] Preferably, the limiting assembly includes partition plates respectively fixed on the bracket and the swing frame, and a longitudinal plate is arranged between two adjacent partition plates.

[0007] Preferably, the longitudinal plate is made of PS plate, and the PS plate is selected to have a smaller thickness to ensure that the PS plate can be pushed to break when the doctor applies pressure to the ex-vivo tooth during filling.

[0008] Preferably, the clamping assembly includes two arc-shaped frames slidably connected to the top of the support plate, a shaping assembly that moves perpendicular to its length is installed inside the arc-shaped frame, one side of the arc-shaped frame is provided with a threaded rod with one end movably extending into the interior thereof, and a knob is fixedly connected to the end of the threaded rod away from the arc-shaped frame.

[0009] Preferably, the shaping component includes a plurality of limit blocks slidably connected to the arc frame, a track groove is provided on one side of the arc frame, one end of the limit block movably extends into the track groove, and a sliding block is installed between two adjacent limit blocks.

[0010] Preferably, two slide grooves adapted to the limit blocks are provided on one side of the sliding block close to the arc frame, and the limit blocks movably extend into the slide grooves.

[0011] Preferably, the material of the connecting material block is a plastic material, and the material of the connecting material block is any one of silicone rubber, alginate or 3D printing resin plastic.

[0012] Preferably, both sides of the base are provided with card slots, and a card block adapted to the card slot is fixedly connected to one side of the simulated gums, and the card block extends into the card slot.

[0013] Preferably, the in vitro tooth fixation method for simulating Class II cavity treatment comprises the following steps:

[0014] Step 1: Prepare the fixed base of the ex vivo tooth;

[0015] Step 2, fix the ex vivo tooth, use a connecting material block to fix the ex vivo tooth, the method of making the connecting material block is to use a plastic material, first put the plastic material used to fix the ex vivo tooth into the base, the plastic material can be silicone rubber or alginate commonly used in stomatology, etc., fix the root of the ex vivo tooth into the connecting material block, and secondly, three-dimensionally scan the shape of the tooth root to be fixed, three-dimensionally print a connecting material block suitable for the tooth root and fix the root of the ex vivo tooth into it, then put the connecting material block into the base, and then put the tooth root into the connecting material block for fixing;

[0016] Step 3: simulate Class II cavity treatment on the ex vivo tooth;

[0017] Step 4: Remove the ex vivo tooth for subsequent experiments.

[0018] Compared with the prior art, the present invention provides an in vitro tooth fixture for simulating Class II cavity treatment, which has the following beneficial effects:

[0019] 1. Through the force control component, multiple ex-vivo teeth can be arranged and fixed firmly in the simulated oral cavity, which is convenient for the preparation and filling treatment of Class II holes in vitro. At the same time, the filling force of Class II holes on the ex-vivo teeth can be limited to simulate the operation of filling Class II holes in the patient's body.

[0020] 2. Through the set limit assembly, the number of PS plates inserted can be flexibly adjusted. When the filling force reaches a certain level, the PS plate will be squeezed and broken. When re-filling, a new PS plate needs to be reinserted. When the doctor is filling a Class II cavity in vitro, if necessary, he will first use a force that causes the patient first-level pain to fill. When the filling effect is not ideal, the filling force is increased in sequence to cause the patient to feel pain at the second, third and fourth levels. In this way, the force of filling the Class II cavity during in vitro research can be controlled as needed, which is convenient for the doctor to flexibly control the squeezing force on the patient's teeth when necessary, thereby achieving the purpose of minimizing the pain suffered by the patient when filling the Class II cavity.

[0021] 3. Through the provided clamping assembly, the shape of the arc-shaped frame of the extruded connecting material block can be flexibly adjusted to adapt to explanted teeth of different sizes, so as to achieve the purpose of balancing the extrusion force exerted on different positions of the connecting material block when pushing the connecting material block to extrude the explanted tooth, so that the silicone rubber around the explanted tooth can move toward the notch of the slider after being squeezed, thereby reducing the possibility of the silicone rubber bulging upward after being squeezed to block the Class II cavity, and reducing the influence of silicone rubber deformation on the filling treatment of Class II cavity.

[0022] 4. Through the provided base, connecting material block and ex vivo tooth, the doctor fills the filling material into the Class II cavity of the ex vivo tooth, then takes out the ex vivo tooth to test the filling effect. After multiple simulations of ex vivo tooth Class II cavity filling in vitro, different materials and different interproximal separation auxiliary devices can be used in preclinical experiments to evaluate the effect of Class II cavity filling, and can also improve the doctor's proficiency in filling Class II cavities in vivo and reduce the pain caused to patients in the oral department when performing Class II cavity filling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2A partial cutaway view of the present invention as a whole;

[0026] Figure 3 It is a structural schematic diagram of the force control component of the present invention;

[0027] Figure 4 is a cross-sectional view of the force control assembly of the present invention;

[0028] Figure 5 It is a schematic diagram of the structure of the clamping assembly of the present invention;

[0029] Figure 6 It is a partial structural schematic diagram of the clamping assembly of the present invention;

[0030] Figure 7 It is a schematic structural diagram of the limit block of the present invention.

[0031] In the figure: 1. base; 2. simulated gums; 3. connecting material block; 5. clamping assembly; 51. arc frame; 52. shaping assembly; 521. limit block; 522. slider; 53. threaded rod; 54. knob; 6. force control assembly; 61. bracket; 62. swing frame; 63. support plate; 64. limit assembly; 641. partition plate; 642. longitudinal plate; 7. clamp block. DETAILED DESCRIPTION

[0032] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0033] Embodiment 1

[0034] The launch of medical products is inseparable from in vitro experiments and then in vivo experiments. At present, the majority of research on dental filling materials is based on Class I cavities. The in vitro model of Class I cavities is very convenient, so most of the current research is based on the effect of Class I cavities. However, the filling of Class II cavities is more difficult than that of Class I cavities. In order to facilitate the evaluation of the filling effect of Class II cavities in the oral cavity, reference is made to Figure 1As an embodiment of the present invention, an ex vivo tooth fixing device for simulating Class II cavity treatment is proposed, which is used to simulate the process of in vitro Class II cavity filling, can simulate the tooth arrangement in the human oral cavity to fix the ex vivo tooth, prepare and fill the in vitro cavity, and finally remove the ex vivo tooth to evaluate the filling effect, which is of great significance for the development and evaluation of dental filling materials. The invention comprises a base 1, a cavity is opened on the top of the base 1, and simulated gums 2 are installed on both sides of the base 1. A connecting material block 3 for fixing the ex vivo tooth is installed inside the cavity of the base 1, the crown part of the ex vivo tooth is exposed, and the root part is fixed inside the connecting material block 3, a clamping component 5 for fixing the connecting material block 3 is installed inside the base 1, and the connecting material block 3 is made of silicone rubber, and slots are opened on both sides of the base 1. A card block 7 adapted to the slot is fixedly connected to one side of the simulated gum 2, and the card block 7 extends to the inside of the slot. The card block 7 is inserted into the slot on the base 1, so that the simulated gum 2 can be easily installed on the base 1, and the simulated gum 2 is used to improve the authenticity of the ex vivo tooth filling.

[0035] When in use, the root of the ex vivo tooth is inserted into the connecting material block 3, and then the connecting material block 3 with the ex vivo tooth fixed is placed in the base 1. According to the arrangement of teeth in the oral cavity, different connecting material blocks 3 are placed in the base 1 in sequence. The simulated gingiva 2 has different spacings to choose from. Simulated gingiva of different sizes are selected and fixed on the base 1. Before material filling, it is also necessary to prepare a Class II cavity on the ex vivo tooth, and then place a separation auxiliary device between adjacent ex vivo teeth to separate the two adjacent teeth to prevent the two adjacent teeth being treated from sticking together. Next, the Class II cavity filling process of the ex vivo tooth can be carried out. The doctor fills the filling material into the Class II cavity of the ex vivo tooth, and then takes out the ex vivo tooth to detect the filling effect. After multiple simulation processes of ex vivo Class II cavity filling of the ex vivo tooth, different materials and different adjacent surface separation auxiliary devices that can be used in preclinical experiments can be used for the effect evaluation of Class II cavity filling, and the proficiency of doctors in in vivo Class II cavity filling can also be improved, reducing the degree of pain caused to patients when performing Class II cavity filling on oral patients.

[0036] Embodiment 2

[0037] Although the in vitro filling research conducted by the Department of Dentistry can improve the proficiency of doctors in filling Class II cavities, there are still some differences from in vivo filling. For example, in vitro filling will not cause pain to the patient, so the doctor will not deliberately control the strength when filling. Therefore, when filling in vivo, there is a possibility that the filling force is too large, causing obvious pain to the patient. In order to enable the doctor to always pay attention to the filling force when performing in vitro Class II cavity filling, so as to reduce the patient's pain during actual filling, refer to Figure 1-Figure 4On the basis of the first embodiment, a structure that triggers the change when the filling force is too large is installed at the bottom of the ex vivo tooth, and a force control component 6 that bends when the force of the ex vivo tooth filling material is too large to change the direction of the clamping component 5 is installed inside the chamber of the base 1. The force control component 6 includes a bracket 61 fixed to the chamber of the base 1, and a swing frame 62 is rotatably connected to one side of the bracket 61, and a support plate 63 is fixedly connected to the top of the swing frame 62. The clamping component 5 is installed on the support plate 63, and a limit component 64 for blocking the swing frame 62 from rotating relative to the bracket 61 is installed between the bracket 61 and the swing frame 62. When in use, the limit component 64 blocks the swing frame 62 from rotating relative to the bracket 61, so that the swing frame 62 and the bracket 61 are both in a vertical direction, and the connecting material block 3 and the ex vivo tooth are placed on the top of the support plate 63, and the clamping component 5 fixes the connecting material block 3 and the ex vivo tooth on the support plate 63.

[0038] When the doctor fills the Class II cavity on the ex-vivo tooth, a certain squeezing force is generated on the ex-vivo tooth. This squeezing force will push the ex-vivo tooth from the side and finally act on the limiting component 64. When the doctor's force acting on the ex-vivo tooth is small during filling, the limiting component 64 cannot be overcome to push the swing frame 62 to rotate relative to the bracket 61. At this time, the swing frame 62, the support plate 63 and the ex-vivo tooth above it are all fixed and will not move, and the doctor can fill the ex-vivo tooth. When the force acting on the ex-vivo tooth during filling reaches a certain level, this force acting on the ex-vivo tooth overcomes the limiting component 64. 4 is blocked, pushing the swing frame 62 to rotate relative to the bracket 61, so that the support plate 63, the connecting material block 3 and the ex-vivo tooth all rotate. The ex-vivo tooth with the changed angle makes it impossible for the doctor to continue to fill the Class II cavity on the ex-vivo tooth in the previous direction. At this time, the swing frame 62 needs to be re-fixed on the bracket 61 before the ex-vivo tooth can be continued to be filled. Multiple ex-vivo teeth can be arranged and fixed firmly in the simulated oral cavity, which is convenient for the preparation and filling treatment of Class II holes in vitro, and at the same time, the filling force of the Class II cavity on the ex-vivo tooth is limited, simulating the operation of filling Class II holes in the patient's body.

[0039] Although it is necessary to reduce the pain caused to the patient as much as possible when filling a Class II cavity, the pain caused by some operations is difficult to avoid. In order to enable the doctor to flexibly control the pain level caused to the patient when necessary and to reduce the pain caused to the patient as much as possible when performing essential filling operations, the present embodiment is provided with a force that can adjust the magnitude of the ex-vivo tooth when changing its angle. The limiting component 64 includes a partition plate 641 respectively fixed on the bracket 61 and the swing frame 62, and a longitudinal plate 642 is arranged between two adjacent partition plates 641. The material of the longitudinal plate 642 is a PS plate. The PS plate is relatively brittle and is prone to cracking or breaking when subjected to external force, especially when subjected to strong impact or friction. In order to achieve the purpose of not bending when subjected to a small external force and directly breaking when subjected to a large external force, the PS plate is selected to have a smaller thickness to ensure that the doctor can push the PS plate to break when the filling collides with the ex-vivo tooth. Figure 3 and Figure 4 First, a PS board is placed on one side of the partition plate 641 between the bracket 61 and the swing frame 62. Due to the limitation of the PS board, the swing frame 62 cannot rotate relative to the bracket 61. At this time, only when the pressure of squeezing the ex vivo tooth during filling reaches a certain level can the PS board be pushed to break. The broken PS board no longer blocks the swing frame 62. At this time, the swing frame 62 rotates downward under the action of the gravity of itself and the support plate 63 above it, the connecting material block 3 and the ex vivo tooth, so that the angle of the Class II cavity on the ex vivo tooth changes. At this time, the pressure caused to the ex vivo tooth during filling is specified as the first-level pressure, and the pain caused to the patient is the first-level pain.

[0040] When the number of PS plates placed between the bracket 61 and the swing frame 62 is increased, the force required to push all PS plates to break on the ex vivo tooth will also increase accordingly. When the number of PS plates placed between the bracket 61 and the swing frame 62 is two, the pressure on the ex vivo tooth during filling is specified to be level 2 pressure, and the pain caused to the patient is level 2 pain; by analogy, there are level 3 pain, level 4 pain, etc. When filling a Class II cavity in vitro, the number of PS plates placed can be flexibly adjusted. When the filling force reaches a certain level, the PS plate is squeezed and broken, and a new PS plate needs to be re-placed for re-filling. When the doctor is filling a Class II cavity in vitro, if necessary, he or she will first fill it with a force that causes level 1 pain to the patient. When the filling effect is not ideal, the filling force is increased in sequence to cause the patient pain of level 2, level 3, and level 4, so as to control the force when filling the Class II cavity during in vitro research as needed, so that the doctor can flexibly control the squeezing force on the patient's teeth when necessary, thereby achieving the purpose of minimizing the pain suffered by the patient during Class II cavity filling.

[0041] Embodiment 3

[0042] When the ex-vivo tooth is directly inserted into the silicone rubber connecting material block 3, the silicone rubber around the ex-vivo tooth will be squeezed, causing the silicone rubber around the ex-vivo tooth to deform. This part of the silicone rubber will bulge upward when deformed, which is likely to block the Class II cavity of the ex-vivo tooth and affect the filling treatment process of the Class II cavity of the ex-vivo tooth. In order to reduce the possibility of the silicone rubber deforming upward and blocking the Class II cavity when the ex-vivo tooth is fixed, refer to Figure 1-Figure 7 On the basis of the first embodiment, the clamping assembly 5 includes two arc frames 51 slidably connected to the top of the support plate 63, and a shaping assembly 52 that moves perpendicular to its length is installed inside the arc frame 51. A threaded rod 53 with one end movably extending into the interior of the arc frame 51 is provided on one side of the arc frame 51, and a knob 54 is fixedly connected to the end of the threaded rod 53 away from the arc frame 51. The shaping assembly 52 includes a plurality of limit blocks 521 slidably connected to the arc frame 51, and a track groove is provided on one side of the arc frame 51, and one end of the limit block 521 movably extends into the interior of the track groove, and a slider 522 is installed between two adjacent limit blocks 521, and two slide grooves that are compatible with the limit block 521 are provided on the side of the slider 522 close to the arc frame 51, and the limit block 521 movably extends into the interior of the slide groove.

[0043] Reference Figure 5 and Figure 6 Before fixing the ex vivo tooth inside the silicone rubber, first place the ex vivo tooth between the two arc frames 51, and then move the slider 522 to the position closest to the ex vivo tooth. In this process, the slider 522 slides along the limit blocks 521 on both sides, and then the two arc frames 51 are moved gradually close to the ex vivo tooth. After part of the slider 522 contacts the ex vivo tooth, it is blocked by the ex vivo tooth and stops moving. In this process, the slider 522 gradually approaches the arc frame 51 relative to the arc frame 51 until the slider 522 is pressed against the arc frame. 51, so that the arc frame 51 can no longer move toward the direction of the ex-vivo tooth. After the two arc frames 51 are moved to the position closest to the ex-vivo tooth, the slider 522 that is partially in contact with the ex-vivo tooth is limited by the ex-vivo tooth, so that a gap with the shape of the ex-vivo tooth appears between them. The doctor turns the knob 54 to drive the threaded rod 53 to move inside the arc frame 51, and the threaded rod 53 pushes the limit block 521 and the slider 522 to move toward the other end of the arc frame 51 until all the limit blocks 521 and the slider 522 are squeezed together and fixed.

[0044] At this time, the two arc frames 51 with notches of the shape of the ex vivo tooth are moved to the starting point, and then the connecting material block 3 is cut into two equal parts along the length direction, and the two connecting material blocks 3 are placed on both sides of the ex vivo tooth respectively. At this time, the arc frame 51 is moved again to be close to the ex vivo tooth. Since the side of the arc frame 51 close to the ex vivo tooth has a notch with the same shape as the ex vivo tooth, when the connecting material block 3 is extruded, the connecting material block 3 close to the position of the ex vivo tooth can be moved to the notch of the slider 522, thereby reducing the extrusion force on the ex vivo tooth, and the shape of the arc frame 51 for extruding the connecting material block 3 can be flexibly adjusted to adapt to ex vivo teeth of different sizes, so as to achieve the purpose of balancing the extrusion force on different positions of the connecting material block 3 when pushing the connecting material block 3 to extrude the ex vivo tooth, so that the silicone rubber around the ex vivo tooth can move to the notch of the slider 522 after being extruded, thereby reducing the possibility of the silicone rubber bulging upward after being extruded to block the Class II cavity, thereby reducing the influence of silicone rubber deformation on the filling treatment of Class II cavity.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An in vitro tooth fixture for simulating Class II cavity treatment, comprising a base (1), a chamber is provided on the top of the base (1), and the characteristics are: Simulated gums (2) are installed on both sides of the base (1); a connecting material block (3) for fixing the ex vivo tooth is installed inside the chamber of the base (1); the crown of the ex vivo tooth is exposed and the root is fixed inside the connecting material block (3); a clamping component (5) for fixing the connecting material block (3) is installed inside the base (1); and a force control component (6) is installed inside the chamber of the base (1) for bending to change the direction of the clamping component (5) when the force applied to the ex vivo tooth filling material is too large; The force control component (6) comprises a bracket (61) fixed to the chamber of the base (1); one side of the bracket (61) is rotatably connected to a swing frame (62); the top of the swing frame (62) is fixedly connected to a support plate (63); the clamping component (5) is mounted on the support plate (63); and a limit component (64) is mounted between the bracket (61) and the swing frame (62) for preventing the swing frame (62) from rotating relative to the bracket (61).

2. The in vitro tooth fixture for simulating Class II cavity treatment according to claim 1, characterized in that: The limiting assembly (64) comprises partition plates (641) respectively fixed on the bracket (61) and the swing frame (62), and a longitudinal plate (642) is arranged between two adjacent partition plates (641).

3. The in vitro tooth fixture for simulating Class II cavity treatment according to claim 2, characterized in that: The longitudinal plate (642) is made of PS plate.

4. The in vitro tooth fixture for simulating Class II cavity treatment according to claim 1, characterized in that: The clamping assembly (5) comprises two arc-shaped frames (51) slidably connected to the top of the support plate (63); a shaping assembly (52) is installed inside the arc-shaped frame (51) and moves along a direction perpendicular to its length; a threaded rod (53) is provided on one side of the arc-shaped frame (51) with one end movably extending into the interior thereof; and a knob (54) is fixedly connected to one end of the threaded rod (53) away from the arc-shaped frame (51).

5. The in vitro tooth fixture for simulating Class II cavity treatment according to claim 4, characterized in that: The shaping component (52) comprises a plurality of limit blocks (521) slidably connected to the arc frame (51); a track groove is provided on one side of the arc frame (51); one end of the limit block (521) movably extends into the track groove; and a sliding block (522) is installed between two adjacent limit blocks (521).

6. The in vitro tooth fixture for simulating Class II cavity treatment according to claim 5, characterized in that: Two sliding grooves adapted to the limiting block (521) are provided on one side of the sliding block (522) close to the arc-shaped frame (51), and the limiting block (521) movably extends into the inside of the sliding grooves.

7. The in vitro tooth fixture for simulating Class II cavity treatment according to claim 1, characterized in that: The material of the connecting material block (3) is a plastic material, and the material of the connecting material block (3) is any one of silicone rubber, alginate or 3D printing resin plastic.

8. The in vitro tooth fixture for simulating Class II cavity treatment according to claim 1, characterized in that: Both sides of the base (1) are provided with card slots, and one side of the simulated gum (2) is fixedly connected with a card block (7) adapted to the card slot, and the card block (7) extends into the interior of the card slot.

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