An endodontic fluid filling device and method

Abstract

The present invention discloses an endodontic fluid filling device and method, and the main technical solution adopted is as follows: an endodontic filling device box, which includes an upper box body and a lower box body that are partitioned into upper and lower layers and can be disassembled; a positive and negative pressure generating device, which is arranged in the lower box body; a pressure monitoring device, which is arranged in the lower box body and is connected to the positive and negative pressure generating device; a pressure recovery device, which is arranged in the lower box body; an auxiliary positioning device, which includes an auxiliary positioning crown, and the auxiliary positioning crown is respectively connected to the positive and negative pressure generating device, the pressure monitoring device and the pressure recovery device and is used for being sleeved on the tooth to be endodontically treated and bonded to the tooth to be endodontically treated; a control and display device, which is arranged in the upper box body and is respectively connected to the positive and negative pressure generating device, the pressure monitoring device and the pressure recovery device; a power supply device, which is arranged in the lower box body and is connected to the control and display device for supplying power to the control and display device.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to an endodontic fluid filling device and method. Background Art

[0002] Pulp and periapical diseases are one of the most common diseases in stomatology, with an incidence rate in the natural population as high as 45%, mainly manifested as severe toothache, local swelling and other symptoms. Root canal treatment is the preferred treatment method for pulp and periapical diseases. The main treatment process is to shape the complex three-dimensional structure of the root canal system and tightly fill it, thoroughly removing the inflammatory pulp tissue, bacteria and their metabolites in the pulp chamber and root canal system, so as to achieve the purpose of eliminating the infection source, preventing reinfection and preserving the natural tooth. Root canal treatment usually includes the following steps: ① Preparation of the access cavity; ② Mechanical cleaning of the root canal system; ③ Chemical preparation of the root canal system; ④ Drying of the root canal system; ⑤ Filling of the root canal system. Since the process of root canal treatment is cumbersome, it usually requires endodontists to complete. Although the standardized root canal treatment method can achieve a relatively high cure rate, it consumes a large amount of medical staff resources. Given the current situation of China's huge population base of 1.4 billion and the limited number of trained specialists, the current medical resources cannot meet the treatment needs of most patients.

[0003] Root canal filling is one of the key steps in the whole process of root canal treatment, and its purpose is to tightly seal the entire root canal system to prevent reinfection. The basic methods of root canal filling include lateral condensation filling method, vertical condensation filling method and warm vertical condensation filling method, all of which use gutta-percha supplemented with root canal sealer for filling. For the lateral condensation filling method, it is generally required that the prepared root canal be a continuous taper with a good apical stop. When using the lateral condensation filling method, a trial point is first carried out before filling, and a suitable master gutta-percha point is selected according to the working length of the root canal and the size of the prepared root canal. After the sealer is sent into the root canal using a reamer or a spiral root canal filler, the selected master gutta-percha point is inserted into the root canal until the required length is reached. If the root canal is not yet full, one or several accessory gutta-percha points can be inserted beside the original gutta-percha point and compacted until the root canal is tightly filled.

[0004] Vertical compaction of warm gutta-percha is another optional solution in clinical stomatology. The vertical compaction method is applicable to fully prepared root canals and can better fill the softened gutta-percha and paste into the irregular root canal system. During the operation, a non-standard gutta-percha point with its tip cut off by 3-4 mm is inserted into the root canal. A heat carrier is used to soften the gutta-percha in the root canal, enhancing its fluidity to fit the root canal for an ideal filling effect. The root canal is vertically compacted to make the apical 1 / 3 of the root canal completely sealed, then a gutta-percha segment is added, and heating and filling continue until the filling is completed. However, the vertical compaction technique of warm gutta-percha has the following disadvantages: (1) High operation difficulty: In the process of root canal preparation for vertical compaction of warm gutta-percha, a stable apical stop is established to prevent the gutta-percha material from exceeding the apical foramen, which requires high operational requirements for mechanical preparation and has a certain degree of difficulty. (2) A large amount of root canal wall preparation is required: When using gutta-percha for filling, the root canal system needs to be prepared to a taper of more than 4%-6%, which will result in a large amount of the lateral wall of dentin being cut, leading to a decrease in the resistance of the tooth tissue and even causing microcracks at the apex, resulting in poor long-term prognosis. (3) There is a risk of thermal injury: When using the vertical compaction technique of warm gutta-percha to fill the root canal, the gutta-percha needs to be heated to 180-230°C to be softened. Some scholars believe that the heating device may cause a certain degree of damage to the patient's cementum, periodontal membrane, and alveolar bone, and the subjective nature of heating time control is strong and it is difficult to implement precise control. Therefore, the clinical application of this technique has certain limitations. Summary of the Invention

[0005] In view of this, the present invention provides a dental root canal fluid filling device and method, mainly aiming to achieve the automatic completion of the root canal filling process, simplify the surgical procedure, shorten the surgical treatment time, lower the technical threshold, reduce the doctor's workload, and save the labor cost of medical staff.

[0006] To achieve the above object, the present invention mainly provides the following technical solutions:

[0007] On the one hand, an embodiment of the present invention provides a dental root canal fluid filling device. It includes:

[0008] A dental root canal filling equipment box, which includes an upper box body and a lower box body that are partitioned into upper and lower layers and can be disassembled;

[0009] A positive and negative pressure generating device, which is arranged in the lower box body and is used to inject or extract gas into the pulp cavity of the tooth to be treated by root canal, creating a positive pressure or negative pressure environment;

[0010] An air pressure monitoring device, which is arranged in the lower box body and is connected to the positive and negative pressure generating device, and is used to monitor the pressure in the pulp cavity of the tooth to be treated by root canal in real time;

[0011] A pressure recovery device is arranged inside the lower box body and is used to connect the pulp cavity of the tooth to be endodontically treated with the external environment, so that the pressure in the pulp cavity of the tooth to be endodontically treated in a positive pressure or negative pressure environment is restored to normal pressure;

[0012] An auxiliary positioning device includes an auxiliary positioning crown. The auxiliary positioning crown is respectively connected to the positive and negative pressure generating device, the air pressure monitoring device and the pressure recovery device, and is used to be sleeved on the tooth to be endodontically treated and adhered to the tooth to be endodontically treated; a round hole is left at the top of the auxiliary positioning crown, and the round hole is hermetically fixed with a filling paste capsule through an interference fit with a sealing soft rubber plug;

[0013] A control and display device is arranged inside the upper box body and is respectively connected to the positive and negative pressure generating device, the air pressure monitoring device and the pressure recovery device. The control and display device is used to control the positive and negative pressure generating device to inject or extract gas into the pulp cavity of the tooth to be endodontically treated to create a positive pressure or negative pressure environment, to control the pressure recovery device to connect the pulp cavity of the tooth to be endodontically treated with the external environment so that the pressure in the pulp cavity in a positive pressure or negative pressure environment is restored to normal pressure, to receive and display in real time the pressure in the pulp cavity of the tooth to be endodontically treated sent by the air pressure monitoring device, and to judge whether the pressure in the pulp cavity of the tooth to be endodontically treated is within a reasonable range;

[0014] A power supply device is arranged inside the lower box body and is connected to the control and display device for supplying power to the control and display device.

[0015] As described above, the positive and negative pressure generating device includes a positive pressure pump, a positive pressure solenoid valve connected to the positive pressure pump, a vacuum pump, and a negative pressure solenoid valve connected to the vacuum pump;

[0016] The air pressure monitoring device uses a pressure sensor;

[0017] The pressure recovery device includes a pressure recovery solenoid valve.

[0018] As described above, the auxiliary positioning device further includes two tower-shaped connectors arranged side by side at the rear side of the box body, and two silicone hoses respectively connected to the two tower-shaped connectors in a one-to-one correspondence;

[0019] The auxiliary positioning crown includes a base, the shape curve of the base fits the side profile of the tooth, and the base is respectively connected to the positive pressure solenoid valve, the negative pressure solenoid valve, the pressure sensor and the pressure recovery solenoid valve through two silicone hoses, and is used to be sleeved on the tooth to be endodontically treated and adhered to the tooth to be endodontically treated;

[0020] The base is a shell structure;

[0021] The round hole is arranged at the top of the base.

[0022] As described above, the control display device includes a display screen, a controller connected to the air pressure monitoring device and the display screen respectively through the I 2 C communication protocol, and a driving module connected to the controller. The controller uses an Arduino development board, and the driving module is connected to the positive and negative pressure generating device and the air pressure recovery device respectively.

[0023] As described above, the power supply device includes a key switch, a power module, a relay module connected to the key switch and the power module respectively, a first step-down module connected to the relay module, and a second step-down module connected in series with the first step-down module; the first step-down module is connected to the driving module, and the second step-down module is connected to the controller and the display screen respectively.

[0024] On the other hand, an embodiment of the present invention also provides a method for filling a dental root canal with fluid, including the following steps:

[0025] S1. Auxiliary positioning crown bonding: Adjust the position of the auxiliary positioning crown and closely bond the auxiliary positioning crown to the tooth to be treated with root canal therapy;

[0026] S2. Air tightness inspection: Fix the filling paste capsule on the auxiliary positioning crown through a sealed soft rubber plug, and extract the gas in the pulp cavity of the tooth to be treated with root canal therapy through the positive and negative pressure generating device. Determine whether there is good air tightness between the auxiliary positioning crown and the filling paste capsule and between the tooth to be treated with root canal therapy according to whether the pressure change rate in the pulp cavity of the tooth to be treated with root canal therapy is less than the set threshold;

[0027] S3. Injecting the filling paste in a negative pressure environment; If the air tightness between the auxiliary positioning crown and the filling paste capsule and between the tooth to be treated with root canal therapy is good, turn on the vacuum pump to create a low-pressure environment in the pulp cavity of the tooth to be treated with root canal therapy. After the absolute pressure in the pulp cavity of the tooth to be treated with root canal therapy is stable at about 1 kPa, turn off the vacuum pump, maintain the negative pressure environment in the pulp cavity of the tooth to be treated with root canal therapy, inject the liquid filling paste, wait for a period of time, and then restore the pressure in the pulp cavity of the tooth to be treated with root canal therapy to normal pressure through the air pressure recovery device;

[0028] S4. Filling the root canal in a positive pressure environment: Open the positive pressure solenoid valve and start the positive pressure pump to inject air into the pulp cavity of the tooth to be treated with root canal therapy. When the air pressure in the pulp cavity of the tooth to be treated with root canal therapy increases to about 150 KPa, wait for a period of time, and the liquid filling paste is pushed into the root canal under the action of the pressure difference, and then restore the pressure in the pulp cavity of the tooth to be treated with root canal therapy to normal pressure;

[0029] S5. Confirming the filling effect: Remove the auxiliary positioning crown, use temporary material to seal the pulp cavity of the tooth to be treated with root canal therapy, take an X-ray dental film, and confirm the treatment effect.

[0030] As described above, in S1, the position of the auxiliary positioning crown is adjusted to fit the contour of the tooth to be endodontically treated, and the auxiliary positioning crown is tightly bonded to the tooth to be endodontically treated using glass ionomer or resin material.

[0031] As described above, in S2, the filling paste capsule is fixed on the auxiliary positioning crown through a sealed soft rubber plug. The sealed soft rubber plug has an interference fit with the auxiliary positioning crown and the filling paste capsule to ensure good airtightness between the filling paste capsule and the auxiliary positioning crown.

[0032] As described above, in S2, the display device is used to calculate the rate of change of the pressure in the pulp chamber of the tooth to be endodontically treated. If the rate of change of the pressure in the pulp chamber of the tooth to be endodontically treated is less than the set threshold, it is determined that the airtightness between the auxiliary positioning crown and the filling paste capsule and between the tooth to be endodontically treated is good;

[0033] If the rate of change of the pressure in the pulp chamber of the tooth to be endodontically treated is greater than the set threshold, it is determined that there is a leak point between the auxiliary positioning crown and the filling paste capsule and between the tooth to be endodontically treated; before performing S3, it also includes the steps of determining the position of the leak point and repairing:

[0034] Add normal saline or deionized water to the isolation barrier cloth until the liquid level covers the auxiliary positioning crown. Inject gas into the pulp chamber of the tooth to be endodontically treated through a positive and negative pressure generating device. Determine the leak point according to the position where the bubbles are generated, re-bond the auxiliary positioning crown or re-fix the sealed soft rubber plug and the filling paste capsule until the airtightness between the auxiliary positioning crown and the filling paste capsule and between the tooth to be endodontically treated is good.

[0035] By means of the above technical solutions, the endodontic fluid filling device and method of the present invention at least have the following advantages:

[0036] The endodontic fluid filling device and method of the present invention design a standardized automatic positive and negative pressure alternating endodontic fluid filling device and method, which simplifies the current clinical root canal filling treatment process. The root canal filling can be automatically realized by the endodontic fluid filling device, and the key steps can be manually intervened and executed, saving the labor cost of medical staff; the principle of using the endodontic fluid filling device to fill the root canal is to utilize the positive and negative pressure difference. In a negative pressure environment, the air pressure in the root canal is extremely low, reducing the apical air lock. Therefore, the filling paste can be filled to the apex. In a positive pressure environment, the filling paste is pushed towards the apex to increase the filling density. Therefore, it can fill the root canal with irregular anatomical shapes, having great advantages compared with the traditional root canal filling method; using a liquid filling paste reduces the requirements for mechanical preparation of the root canal and does not require heating, reducing the damage to the tooth tissue.

[0037] The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and be able to implement it according to the content of the specification, the following will describe in detail with reference to the preferred embodiments of the present invention and the accompanying drawings. Description of the Drawings

[0038] Figure 1 is the working principle block diagram of the dental root canal fluid filling device of the present invention;

[0039] Figure 2 is the working principle block diagram among the positive and negative pressure generating device, the air pressure recovery device and the auxiliary positioning device of the present invention;

[0040] Figure 3 is the schematic diagram of the connection structure of the positive and negative pressure generating device, the air pressure recovery device and the auxiliary positioning device of the present invention;

[0041] Figure 4 is the schematic diagram of the auxiliary positioning device and the box body structure of the present invention;

[0042] Figure 5 is the X-ray dental film of the filling result of filling two extracted teeth with the dental root canal fluid filling device of the present invention;

[0043] Figure 6 is the X-ray dental film taken at the initial diagnosis before root canal filling in clinic;

[0044] Figure 7 is the main point tracing X-ray dental film taken during the clinical root canal surgery after the root canal mechanical preparation and chemical preparation are completed and the gutta-percha point is inserted into the appropriate position of the root canal;

[0045] Figure 8 is the X-ray dental film taken after filling the root canal with the dental root canal fluid filling device of the present invention. Detailed Embodiments

[0046] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following will describe in detail the specific embodiments, structures, features and their effects of the application according to the present invention with reference to the accompanying drawings and preferred embodiments.

[0047] As Figure 1 shown, a dental root canal fluid filling device proposed in an embodiment of the present invention includes: a dental root canal filling device box 1, a positive and negative pressure generating device 2, a air pressure monitoring device 3, an air pressure recovery device 4, an auxiliary positioning device 5, a control display device 6 and a power supply device 7.

[0048] As Figures 1 to 4As shown, the root canal filling equipment box 1 includes an upper box body 11 and a lower box body 12 which are partitioned into upper and lower layers and can be disassembled; two cooling fans 13 are installed at the rear of the root canal filling equipment box 1, and the cooling fans 13 are connected to the power supply device 7; ventilation openings 14 are provided in the middle and on both sides of the box body 1; in the present invention, in order to facilitate the access to the equipment, a handle 15 is installed at the upper end of the root canal filling equipment box 1. The positive and negative pressure generating device 2 is arranged in the lower box body 12 and is used to inject or extract gas into the pulp cavity of the tooth 8 to be treated by root canal, creating a positive or negative pressure environment. The positive and negative pressure generating device 2 includes a positive pressure pump 21, a positive pressure solenoid valve 22 connected to the positive pressure pump 21, a vacuum pump 23, and a negative pressure solenoid valve 24 connected to the vacuum pump 23. The air pressure monitoring device 3 is arranged in the lower box body 12 and is connected to the positive and negative pressure generating device 2, and is used to monitor the air pressure in the pulp cavity of the tooth 8 to be treated by root canal in real time. The air pressure recovery device 4 is arranged in the lower box body 12 and is used to connect the pulp cavity of the tooth 8 to be treated by root canal with the external environment, so that the air pressure in the pulp cavity of the tooth 8 to be treated by root canal in a positive or negative pressure environment returns to normal pressure; the air pressure recovery device 4 includes an air pressure recovery solenoid valve 41. The auxiliary positioning device 5 includes two tower-shaped connectors 51 arranged side by side at the rear of the box body 1, two silicone hoses 52 respectively connected to the two tower-shaped connectors 51 in one-to-one correspondence, and an auxiliary positioning crown 53 respectively connected to the two silicone hoses 52; the auxiliary positioning crown 53 is respectively connected to the positive and negative pressure generating device 2, the air pressure monitoring device 3 and the air pressure recovery device 4 and is used to be sleeved on the tooth 8 to be treated by root canal and bonded to the tooth 8 to be treated by root canal; a round hole is left at the top of the auxiliary positioning crown 53, and the round hole is hermetically fixed with a filling paste capsule through interference fit with a sealing soft rubber plug 9; the auxiliary positioning crown 53 includes a base 531, the shape curve of the base 531 coincides with the side profile of the tooth, and the base 531 is respectively connected to the positive pressure solenoid valve 22, the negative pressure solenoid valve 24, the pressure sensor and the air pressure recovery solenoid valve 41 through two silicone hoses 52 and is used to be sleeved on the tooth 8 to be treated by root canal and bonded to the tooth 8 to be treated by root canal; the base is a shell structure; the round hole is arranged at the top of the base 531.A control and display device 6 is provided inside the upper box body 11 and is respectively connected to the positive and negative pressure generating device 2, the air pressure recovery device 4, and the air pressure monitoring device 3. The control and display device 6 is used to control the positive and negative pressure generating device 2 to inject or extract gas into or from the pulp cavity of the tooth 8 to be endodontically treated to create a positive or negative pressure environment, to control the air pressure recovery device 4 to connect the pulp cavity of the tooth 8 to be endodontically treated to the external environment so that the pressure in the pulp cavity in the positive or negative pressure environment returns to normal pressure, to receive and display in real time the pressure in the pulp cavity of the tooth 8 to be endodontically treated sent by the air pressure monitoring device 3, and to determine whether the pressure in the pulp cavity of the tooth 8 to be endodontically treated is within a reasonable range; the control and display device 6 includes a display screen 61, through I. 2The controller 62 of the C communication protocol is respectively connected to the pressure sensor 3 and the display screen 61, and the driving module 63 is connected to the controller 62. The driving module 63 is respectively connected to the positive and negative pressure generating device 2 and the air pressure recovery device 4. Specifically, the driving module 63 is respectively connected to the positive pressure pump 21, the positive pressure solenoid valve 22, the vacuum pump 23, the negative pressure solenoid valve 24 and the air pressure recovery solenoid valve 41. The controller 62 uses an Arduino development board, and transmits voltage signals to the positive and negative pressure generating device and the air pressure recovery device through the Arduino development board and the driving module, so as to realize the various functions of the positive and negative pressure generating device and the air pressure recovery device. In the present invention, the controller 62 can also use a 51 single-chip microcomputer, an STM32 single-chip microcomputer, etc. Specifically, the embodiments of the present invention do not limit this. The pressure sensor sends data to the Arduino development board. After the Arduino development board calculates and converts the data into appropriate units, it sends the pressure data to the display screen, and the display screen displays the change of the intramedullary pressure in real time. The Arduino development board judges whether the pressure is within a reasonable range. The power supply device 7 is arranged in the lower box body 12 and is connected to the control and display device 6 for supplying power to the control and display device 6. The power supply device 7 includes a key switch 71, a power module 72, a relay module 73 respectively connected to the key switch 71 and the power module 72, a first step-down module 74 connected to the relay module 73, and a second step-down module 75 connected in series with the first step-down module 74; the first step-down module 74 is connected to the driving module 63, and the second step-down module is respectively connected to the controller 62 and the display screen 61. In the present invention, the first step-down module 74 uses a 12VDC-DC adjustable DC step-down module; the second step-down module 75 uses a 5VDC-DC adjustable DC step-down module. The power module converts 220V alternating current into direct current, and uses the key switch to control the connection and disconnection of the relay module. When the key is pressed, the relay module is connected. Two DC-DC adjustable DC step-down modules are used in series after the relay module, and the two step-down modules output different voltages respectively to meet the power supply requirements of the Arduino development board, the display screen, the driving module and the fan.

[0049] In the present invention, under an environment of alternating positive and negative pressures, a liquid paste is used to fill the dental root canal. The specific working principle is as follows: First, negative pressure air extraction is performed. A vacuum pump is used to create a negative pressure environment in the pulp chamber and root canal of the tooth to be treated. The liquid filling paste is injected under an environment with an absolute pressure of about 1 KPa, and then wait for the liquid filling paste to seal the root canal orifice. Subsequently, positive pressure filling is carried out. The air pressure in the pulp chamber of the tooth to be treated is increased to about 150 KPa. At this time, since the root canal is sealed and the root canal is still in a negative pressure environment, the filling paste is sucked into the root canal system under the action of the pressure difference. And because the air pressure in the root canal is extremely low, the air lock in the apical region is reduced. Therefore, the paste can be filled to the apex. At the same time, since the pulp chamber is in a positive pressure environment, the liquid paste is under a greater pressure difference, squeezing the filling paste to move towards the root canal direction, increasing the filling compactness. Compared with the traditional method of filling the root canal, filling the root canal with a liquid filling material under a negative pressure environment has obvious advantages for root canals with complex anatomical shapes, and positive pressure filling increases the filling compactness.

[0050] During root canal filling, a relatively large negative pressure and positive pressure will be applied to the root canal. Considering safety issues, a gas pressure monitoring device is set up. This gas pressure monitoring device is always connected to the pulp chamber of the tooth to be treated during the process of filling the root canal. The pressure sensor monitors the pressure value in real time, sends it to the controller, and is displayed on the digital display screen. The controller judges whether the pressure value in the pulp chamber of the tooth to be treated is within a reasonable range. The functional components such as the pump and valve of the dental root canal fluid filling device are connected through silicone hoses, adapters, and tee joints to ensure the airtightness of the pipeline.

[0051] Furthermore, in the present invention, the power supply device can also be replaced with other forms. For example, each module can be integrated on a circuit board. Specifically, the embodiments of the present invention do not limit this.

[0052] Furthermore, in the present invention, the positions of the components of the dental root canal fluid filling device, the shape of the box body, and the internal structure of the box body can all be replaced and freely adjusted.

[0053] Furthermore, in the present invention, the liquid filling paste can be in the form of a capsule or other forms. Specifically, the embodiments of the present invention do not limit this.

[0054] On the other hand, the embodiments of the present invention also provide a method for filling a dental root canal fluid, including the following steps:

[0055] S1. Auxiliary positioning crown bonding: Adjust the position of the standard auxiliary positioning crown to fit the contour of the tooth to be treated by the patient. Use glass ionomer or resin materials, etc. to bond the auxiliary positioning crown to the tooth, ensure that the auxiliary positioning crown is tightly bonded to the tooth to be treated, and connect the dental root canal fluid filling device to the tooth to be treated;

[0056] S2. Airtightness inspection: Fix the paste-filled capsule on the auxiliary positioning crown through a sealed soft rubber plug. The sealed soft rubber plug has an interference fit with the auxiliary positioning crown and the paste-filled capsule to ensure good airtightness between the paste-filled capsule and the auxiliary positioning crown. Open the negative pressure solenoid valve, close the positive pressure solenoid valve and the air pressure recovery solenoid valve, turn on the vacuum pump, and after about 5 s, turn off the vacuum pump. The pressure sensor monitors the pressure in the pulp chamber of the tooth to be root canal treated in real time and sends the pressure value to the Arduino development board. The Arduino development board calculates the pressure change rate. If the pressure change rate is less than the set threshold, it is determined that the airtightness of the bond between the tooth to be root canal treated and the auxiliary positioning crown is good, and the next step is executed; otherwise, it is determined that there is an air leakage point in the bond between the tooth to be root canal treated and the auxiliary positioning crown. Add normal saline or deionized water into the previously installed isolation barrier cloth until the liquid level covers the auxiliary positioning crown. Close the negative pressure solenoid valve and the air pressure recovery solenoid valve, open the positive pressure solenoid valve, and the positive pressure pump works to inject gas into the pulp chamber of the tooth to be root canal treated. Determine the location of the air leakage point according to the position where the bubbles are generated, re-bond the auxiliary positioning crown or re-fix the sealed soft rubber plug and the paste-filled capsule until the airtightness of the system is good. After the airtightness inspection is completed, all solenoid valves, the positive pressure pump, and the vacuum pump are closed;

[0057] S3. Inject liquid filling paste in a negative pressure environment: If the airtightness between the auxiliary positioning crown, the paste-filled capsule, and the tooth to be root canal treated is good, first open the negative pressure solenoid valve, close the positive pressure solenoid valve and the air pressure recovery solenoid valve, turn on the vacuum pump. The vacuum pump continuously pumps air to create a low-pressure environment in the pulp chamber of the tooth to be root canal treated, with a pressure of about 1 KPa. Wait for about 30 s after the liquid filling paste is injected, and then open the air pressure recovery solenoid valve until the air pressure in the pulp chamber of the tooth to be root canal treated returns to normal pressure;

[0058] S4. Fill the root canal in a positive pressure environment: First, open the positive pressure solenoid valve, close the negative pressure solenoid valve and the air pressure recovery solenoid valve. The pulp chamber and root canal system of the tooth with root canal treatment are directly connected to the positive pressure pump and the pressure sensor. The positive pressure pump starts to inject air into the pulp chamber of the tooth to be root canal treated. When the air pressure in the pulp chamber of the tooth to be root canal treated increases to about 150 KPa, push the filling paste towards the root tip direction. Wait for about 30 s, and the liquid filling paste is pushed into the root canal under the action of the pressure difference. Then, restore the positive pressure in the pulp chamber of the tooth to be root canal treated to normal pressure. At this time, open the air pressure recovery solenoid valve until the air pressure in the pulp chamber of the tooth to be root canal treated returns to normal pressure. During this process, the rotation speed of the positive pressure pump can be adjusted to further adjust the pressure in the pulp chamber of the tooth to be root canal treated. Turn off the device. After the liquid filling root canal treatment in the positive and negative pressure alternating environment is completed, the positive pressure pump, the vacuum pump, and the three gas path solenoid valves are all closed.

[0059] S5. Confirm the filling effect: Remove the auxiliary positioning crown, seal the pulp chamber with temporary material, take an X-ray dental film, and confirm the treatment effect.

[0060] After the preoperative preparation, pulp cavity preparation, mechanical and chemical preparation of the root canal are completed in the present invention, the filling of the root canal system can be automatically completed by the dental root canal fluid filling device, and key steps can be intervened manually by medical staff.

[0061] The following takes specific embodiments to illustrate in detail the dental root canal fluid filling device and method of the present invention.

[0062] Embodiment 1.

[0063] Use the dental root canal fluid filling device of the present invention to fill extracted teeth. As Figure 5 shown are X-ray dental films of the filling results of two extracted teeth experiments. Before the experiment, the root canals were mechanically prepared to a suitable size, and the apical foramina were sealed. During the experiment, the dental root canal fluid filling device of the present invention was used and completed according to the positive and negative pressure alternating dental root canal fluid filling process of the present invention. It can be seen that using the dental root canal fluid filling device of the present invention can fill the root canals well. The X-ray dental films show that the filling results have high density, and it can fill the lateral root canals that have not been mechanically prepared and the curved root canals with a large curvature in the apical region.

[0064] Embodiment 2.

[0065] The dental root canal fluid filling device of the present invention is also used in clinical operations, adopting the positive and negative pressure alternating dental root canal fluid filling process of the present invention. Among them Figure 6 is the X-ray dental film taken at the initial diagnosis, Figure 7 is the main point tracing X-ray dental film taken during the operation after the mechanical and chemical preparation of the root canal is completed and the gutta-percha point is inserted into the appropriate position of the root canal, Figure 8 is the X-ray dental film taken after filling the root canal with the dental root canal fluid filling device. By comparing the filling results in the positive and negative pressure alternating environment with the main point tracing pictures, it can be found that when using the dental root canal fluid filling device of the present invention to fill the root canal, the position of the paste entering the root canal is almost the same as the filling position of using the gutta-percha point to fill the root canal. It proves the feasibility of using the dental root canal fluid filling device to fill the root canal clinically. During the root canal filling treatment process using the dental root canal fluid filling device clinically, the patient did not feel obvious discomfort under local anesthesia.

[0066] The root canal fluid filling device and method of the present invention design a standardized automated positive and negative pressure alternating root canal fluid filling device and method, which simplifies the current clinical root canal filling treatment process. The filling of the root canal can be automatically realized by the root canal fluid filling device, and the key steps can be manually intervened and executed, saving the labor cost of medical staff. The principle of using the root canal fluid filling device to fill the root canal is to utilize the positive and negative pressure difference. Under the negative pressure environment, the air pressure in the root canal is extremely low, reducing the apical air lock. Therefore, the filling paste can be filled to the apex. Under the positive pressure environment, the filling paste is pushed towards the apex direction to increase the filling density. Therefore, it can fill the root canal with irregular anatomical shapes, having great advantages compared with the traditional root canal filling method. Using liquid filling paste reduces the requirements for mechanical preparation of the root canal and does not require heating, reducing the damage to dental tissues.

[0067] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An endodontic fluid filling device, characterized in that: It includes: An endodontic filling equipment box, which includes an upper box body and a lower box body that are partitioned into upper and lower layers and can be disassembled; A positive and negative pressure generating device, which is arranged in the lower box body and is used to inject or extract gas into the pulp cavity of the tooth to be endodontically treated, creating a positive or negative pressure environment; An air pressure monitoring device, which is arranged in the lower box body and is connected to the positive and negative pressure generating device, and is used to monitor the pressure in the pulp cavity of the tooth to be endodontically treated in real time; An air pressure recovery device, which is arranged in the lower box body and is used to connect the pulp cavity of the tooth to be endodontically treated with the external environment, so that the pressure in the pulp cavity of the tooth to be endodontically treated in a positive or negative pressure environment returns to normal pressure; An auxiliary positioning device, which includes an auxiliary positioning crown. The auxiliary positioning crown is respectively connected to the positive and negative pressure generating device, the air pressure monitoring device and the air pressure recovery device, and is used to be sleeved on the tooth to be endodontically treated and bonded to the tooth to be endodontically treated; A round hole is left at the top of the auxiliary positioning crown, and the round hole is hermetically fixed with a filling paste capsule through an interference fit with a sealing soft rubber plug; A control and display device, which is arranged in the upper box body and is respectively connected to the positive and negative pressure generating device, the air pressure monitoring device and the air pressure recovery device. The control and display device is used to control the positive and negative pressure generating device to inject or extract gas into the pulp cavity of the tooth to be endodontically treated to create a positive or negative pressure environment, to control the air pressure recovery device to connect the pulp cavity of the tooth to be endodontically treated with the external environment so that the pressure in the pulp cavity in a positive or negative pressure environment returns to normal pressure, to receive and display in real time the pressure in the pulp cavity of the tooth to be endodontically treated sent by the air pressure monitoring device, and to judge whether the pressure in the pulp cavity of the tooth to be endodontically treated is within a reasonable range; A power supply device, which is arranged in the lower box body and is connected to the control and display device, and is used to supply power to the control and display device.

2. The endodontic fluid filling equipment according to claim 1, wherein The positive and negative pressure generating device includes a positive pressure pump, a positive pressure solenoid valve connected to the positive pressure pump, a vacuum pump, and a negative pressure solenoid valve connected to the vacuum pump; The air pressure monitoring device uses a pressure sensor; The air pressure recovery device includes an air pressure recovery solenoid valve.

3. The endodontic fluid filling equipment according to claim 2, wherein The auxiliary positioning device further includes two tower-shaped connectors arranged side by side at the rear of the box body, and two silicone hoses respectively connected to the two tower-shaped connectors one by one; The auxiliary positioning crown includes a base, the shape curve of the base fits the side profile of the tooth, and the base is respectively connected to the positive pressure solenoid valve, the negative pressure solenoid valve, the pressure sensor and the air pressure recovery solenoid valve through two silicone hoses, and is used to be sleeved on the tooth to be endodontically treated and bonded to the tooth to be endodontically treated; The base is a shell structure; The round hole is arranged at the top of the base.

4. The endodontic fluid filling equipment according to claim 1, wherein The control and display device includes a display screen, a controller connected to the air pressure monitoring device and the display screen respectively through the I 2 C communication protocol, and a driving module connected to the controller. The controller uses an Arduino development board, and the driving module is connected to the positive and negative pressure generating device and the air pressure recovery device respectively.

5. The endodontic fluid filling equipment according to claim 4, wherein The power supply device includes a key switch, a power module, a relay module connected to the key switch and the power module respectively, a first step-down module connected to the relay module, and a second step-down module connected in series with the first step-down module; the first step-down module is connected to the drive module, and the second step-down module is connected to the controller and the display screen respectively.

6. A method for filling a dental root canal with fluid, characterized in that, It includes the following steps: S1. Adhesion of the auxiliary positioning crown: Adjust the position of the auxiliary positioning crown and closely adhere the auxiliary positioning crown to the tooth to be endodontically treated. S2. Air tightness inspection: Fix the filling paste capsule on the auxiliary positioning crown through a sealed soft rubber plug, and extract the gas in the pulp chamber of the tooth to be endodontically treated through a positive and negative pressure generating device. Determine whether there is good air tightness between the auxiliary positioning crown and the filling paste capsule and between the tooth to be endodontically treated according to whether the pressure change rate in the pulp chamber of the tooth to be endodontically treated is less than the set threshold. S3. Inject the filling paste in a negative pressure environment; if there is good air tightness between the auxiliary positioning crown and the filling paste capsule and between the tooth to be endodontically treated, turn on the vacuum pump to create a low-pressure environment in the pulp chamber of the tooth to be endodontically treated. After the absolute pressure in the pulp chamber of the tooth to be endodontically treated stabilizes at about 1 kPa, turn off the vacuum pump, maintain the negative pressure environment in the pulp chamber of the tooth to be endodontically treated, inject the liquid filling paste, wait for a period of time, and then restore the pressure in the pulp chamber of the tooth to be endodontically treated to normal pressure through a pressure recovery device. S4. Fill the root canal in a positive pressure environment: Open the positive pressure solenoid valve and start the positive pressure pump to inject air into the pulp chamber of the tooth to be endodontically treated. When the air pressure in the pulp chamber of the tooth to be endodontically treated increases to about 150 KPa, wait for a period of time, and the liquid filling paste is pushed into the root canal under the action of the pressure difference. Then restore the pressure in the pulp chamber of the tooth to be endodontically treated to normal pressure. S5. Confirm the filling effect: Remove the auxiliary positioning crown, use temporary material to seal the pulp chamber of the tooth to be endodontically treated, take an X-ray dental film, and confirm the treatment effect.

7. The endodontic fluid filling method according to claim 6, characterized in that In S1, adjust the position of the auxiliary positioning crown to fit the contour of the tooth to be endodontically treated, and use glass ionomer or resin material to closely adhere the auxiliary positioning crown to the tooth to be endodontically treated.

8. The endodontic fluid filling method according to claim 6, characterized in that In S2, fix the filling paste capsule on the auxiliary positioning crown through a sealed soft rubber plug. The sealed soft rubber plug has an interference fit with the auxiliary positioning crown and the filling paste capsule to ensure good air tightness between the filling paste capsule and the auxiliary positioning crown.

9. The endodontic fluid filling method according to claim 6, characterized in that In S2, calculate the pressure change rate in the pulp chamber of the tooth to be endodontically treated through a control display device. If the pressure change rate in the pulp chamber of the tooth to be endodontically treated is less than the set threshold, it is determined that there is good air tightness between the auxiliary positioning crown and the filling paste capsule and between the tooth to be endodontically treated. If the rate of change of the pressure in the pulp chamber of the tooth to be endodontically treated is greater than the set threshold, it is determined that there is an air leakage point between the auxiliary positioning crown and the filling paste capsule and the tooth to be endodontically treated; before performing S3, it also includes the steps of determining the location of the air leakage point and repairing: Add normal saline or deionized water into the isolation barrier cloth until the liquid level covers the auxiliary positioning crown, inject gas into the pulp chamber of the tooth to be endodontically treated through a positive and negative pressure generating device, determine the air leakage point according to the position where the bubbles are generated, re-bond the auxiliary positioning crown or re-fix the sealing soft rubber plug and the filling paste capsule until the airtightness between the auxiliary positioning crown and the filling paste capsule and the tooth to be endodontically treated is good.

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