Dental implantation positioning assembly and positioning method therefor

Abstract

A dental implantation positioning assembly, comprising: a guide plate (100), which is provided with a guide hole (110); an annular magnet (200), which is arranged in the guide hole (110) and is provided with a mounting hole (210); a guide ring (300), which is arranged in the mounting hole (210) and is provided with a through guide hole (310); a handpiece (400), which is provided with a head (410), wherein the head (410) is provided with a cutter head (420); and a magnetic-field sensor (600), which is arranged on the head (410). The drilling depth of the cutter head (420) is determined on the basis of a magnetic-field intensity measured by the magnetic-field sensor (600), such that the depth of a prepared implantation cavity is more accurate. A conventional drill bit for implant surgery is used in guide plate implant surgery, thereby saving on the cost of customizing a guide plate drill bit.

Description

Dental implant positioning assembly and positioning method thereof Technical Field

[0001] The present invention relates to the technical field of dental implants, and in particular to a dental implant positioning component and a positioning method thereof. Background Art

[0002] Dental implant guides, also known as surgical guides or implant guides, are auxiliary tools used in dental implant surgery. They are customized instruments based on the patient's oral morphology and implant plan. When preparing an implant cavity in the patient's mouth, the guide holes in the implant guide allow the angle, position, and depth of a specialized guide drill to be controlled, ensuring more accurate positioning, depth, and angle of the implant cavity. This is because the guide drill bit is equipped with guide posts that mate with the guide holes to provide coaxial and depth control for the drill. However, the length of the guide posts is limited. When preparing a deeper implant cavity, the guide posts of a longer guide drill bit often cannot extend into the guide hole, necessitating a stepwise preparation process starting with a shorter guide drill bit, which increases the number of drilling steps. Furthermore, customized guide drill bits are expensive, which in turn increases the cost of using the guide. Therefore, there is an urgent need for a positioning assembly and method suitable for conventional implant drill bits to reduce the number of drill bits used in guided implant surgery and to control the drilling angle, position, and depth of conventional implant drill bits.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to provide a dental implant positioning assembly to solve one or more technical problems existing in the prior art and at least provide a beneficial option or create conditions.

[0005] The technical solutions adopted to solve the above technical problems are:

[0006] A dental implant positioning component, comprising:

[0007] a guide plate having a guide hole;

[0008] an annular magnet, which is arranged in the guide hole, and the annular magnet is provided with a mounting hole;

[0009] A guide ring is provided in the mounting hole, wherein the guide ring is provided with a through guide hole;

[0010] A mobile phone having a head equipped with a cutting head;

[0011] A magnetic field sensor is provided on the machine head. The tool head moves along the guide hole so that the magnetic field intensity measured by the magnetic field sensor changes.

[0012] The beneficial effect of the present invention is as follows: the guide plate is installed in the patient's mouth, and then the doctor holds a mobile phone and inserts it into the guide hole of the guide ring, starts the mobile phone to drive the blade head to rotate, so that the blade head moves along the guide hole toward the patient's alveolar bone, and the blade head drills an implant cavity in the patient's alveolar bone, and the magnetic field sensor on the handpiece measures the magnetic field strength generated by the annular magnet in the guide plate. Since the annular magnet surrounds the outer circumference of the guide hole, the magnetic field generated by the annular magnet is rotationally symmetrical along its axis, that is, the magnetic field strength generated by the annular magnet changes along the direction of the axis, that is, the change in the distance between the magnetic field sensor and the end face of the annular magnet will change the magnetic field strength measured by the magnetic field sensor. Even if the doctor rotates the mobile phone around the axis of the blade head to adjust the posture of the handpiece, the magnetic field sensor on the handpiece rotates with the guide hole in the middle of the annular magnet as the axis, and the magnetic field strength measured by the magnetic field sensor remains unchanged. Therefore, the blade head moves along the axis of the guide hole and thus changes the magnetic field strength measured by the magnetic field sensor. The drilling depth of the blade head can be judged by the magnetic field strength measured by the magnetic field sensor, so that the depth of the prepared implant cavity is more accurate.

[0013] As a further improvement of the above technical solution, the end face of the guide ring is perpendicular to the axis of the guide hole, and the dental implant positioning assembly also includes a guide mechanism, which is slidably connected to the machine head, and the sliding direction of the guide mechanism is parallel to the axis of the cutter head. The guide mechanism is provided with a support surface on the side facing away from the machine head, and the support surface is abutted against the end face of the guide ring so that the movement trajectory of the cutter head relative to the guide plate is parallel to the axis of the guide hole.

[0014] The end face of the guide ring is perpendicular to the axis of the guide hole, and the end face of the guide ring is parallel to the end face of the annular magnet. When the support surface of the guide mechanism abuts against the end face of the guide ring, the sliding direction of the guide mechanism relative to the handpiece is perpendicular to the end face of the guide ring, that is, the sliding direction of the handpiece relative to the guide mechanism is parallel to the axis of the guide hole, and the sliding direction of the guide mechanism is parallel to the axis of the cutter head. When the cutter head of the handpiece prepares an implant cavity in the patient's alveolar bone, the doctor holds the mobile phone and moves the cutter head gradually deeper into the guide hole along the axis of the guide hole, ensuring that the magnetic field sensor moves in a direction parallel to the axis of the annular magnet, thereby improving the accuracy of the magnetic field sensor in measuring changes in magnetic field intensity.

[0015] As a further improvement of the above technical solution, the end face of the guide ring is further provided with a positioning member, and the side wall of the positioning member abuts against the side wall of the guide mechanism so that the axis of the cutter head coincides with the axis of the guide hole.

[0016] The guide mechanism is positioned by abutting the side walls of the positioning piece against the side walls of the guide mechanism so that the axis of the cutter head coincides with the axis of the guide hole, thereby making the drilling direction of the cutter head coincide with the axis of the guide hole, making the angle and position of the implant cavity prepared by the cutter head more accurate.

[0017] As a further improvement of the above technical solution, the positioning member surrounds the outer circumference of the guide hole, and the guide mechanism includes:

[0018] a guide post slidably connected to the machine head;

[0019] A support body is connected to the guide column, the support surface is arranged on the side of the support body facing away from the machine head, and the outer contour of the support body matches the shape formed by the positioning piece.

[0020] The positioning piece is arranged around the periphery of the guide hole, so that the positioning piece forms a structure for guiding the support body, which makes it convenient for the doctor to operate the mobile phone to make the support body fall into the structure formed by the positioning piece.

[0021] As a further improvement of the above technical solution, the positioning member forms a circular groove, the axis of the guide hole coincides with the axis of the circular groove, the support body is annular, and the axis of the support body coincides with the axis of the cutter head.

[0022] The positioning piece forms a circular groove, and the support body is in a circular ring shape. The doctor does not need to hold the mobile phone to insert the support body into the structure surrounded by the positioning piece at a specific angle, thereby improving the convenience of operation.

[0023] As a further improvement of the above technical solution, the support body is a magnetic body.

[0024] The support body and the annular magnet attract each other. When the doctor holds the mobile phone and moves the support body to abut the positioning piece, the annular magnet attracts the support body so that the support body falls into the structure surrounded by the positioning piece.

[0025] As a further improvement of the above technical solution, the axis of the guide hole is perpendicular to the end face of the annular magnet.

[0026] The axis of the guide hole is perpendicular to the end face of the annular magnet. When the cutter head moves along the guide hole, the guide hole has a limiting effect on the cutter head, causing the head to move in a direction parallel to the axis of the guide hole, making the magnetic field intensity change measured by the magnetic field sensor more accurate.

[0027] A positioning method, applicable to the dental implant positioning assembly as described above, comprises the following steps:

[0028] S1, the depth of the cutting head passing through the guide hole is the cutting depth, and the magnetic field strength measured by the magnetic field sensor at multiple cutting depths is recorded to form a corresponding relationship between the cutting depth and the magnetic field strength;

[0029] S2. Designing the implant cavity depth, wherein the cutting depth is equal to the implant cavity depth, and finding the magnetic field intensity corresponding to the implant cavity depth as the stop value according to the corresponding relationship;

[0030] S3. Fix the guide plate, and extend the cutter head into the guide hole until the magnetic field intensity measured by the magnetic field sensor is not less than the stop value.

[0031] First, by recording the magnetic field strength measured by the magnetic field sensor at multiple cutting depths, a correspondence between the cutting depth and the magnetic field strength is formed, and then the magnetic field strength corresponding to the implant cavity depth is found from the correspondence. When the cutter head is driven to drill with a handheld mobile phone, the magnetic field strength measured by the magnetic field sensor is used to judge whether the drilling depth of the cutter head has reached the requirement, so that drilling can be stopped in time to make the depth of the implant cavity more accurate.

[0032] As a further improvement of the above technical solution, in step S1, the length of the cutter head is L1, the depth from the end face of the annular magnet to the bottom face of the guide plate is L2, the measured distance between the machine head and the end face of the annular magnet is L3, and the cutting depth is L4, L4=L1-L2-L3.

[0033] In step S1, the depth L2 from the end face of the annular magnet to the bottom face of the guide plate can be determined after the guide plate is manufactured. The length L1 of the cutter head can be directly obtained from the specifications of the cutter head. The distance L3 between the machine head and the end face of the annular magnet is measured by a measuring tool, thereby calculating the cutting depth L4. There is no need to use a measuring tool to measure the cutting depth of the cutter head extending through the guide hole, thereby improving measurement efficiency.

[0034] As a further improvement of the above technical solution, the mobile phone also includes a controller, and the magnetic field sensor sends the measured magnetic field strength to the controller in the form of an electrical signal. In step S3, the stop value is input to the controller. When the magnetic field strength is not less than the stop value, the controller controls the mobile phone to stop rotating the cutter head.

[0035] The stop value obtained in step S2 is input into the controller. After the controller determines that the magnetic field strength sent by the magnetic field sensor is not less than the stop value, the controller automatically controls the cutter head to stop rotating without operating the mobile phone, thereby avoiding misoperation and drilling too deep. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0037] FIG1 is a structural diagram of an embodiment of a dental implant positioning assembly provided by the present invention;

[0038] FIG2 is an exploded schematic diagram of an embodiment of a dental implant positioning assembly provided by the present invention;

[0039] FIG3 is a cross-sectional view of a positioning method of a dental implant positioning assembly provided by the present invention, and a schematic diagram of a cutter head preparing an implant cavity;

[0040] FIG4 is a schematic diagram of the positioning method of the dental implant positioning assembly provided by the present invention, in which the magnetic field sensor moves relative to the annular magnet along its axis;

[0041] FIG5 is a diagram illustrating a positioning method for a dental implant positioning assembly provided by the present invention, wherein a magnetic field sensor moves relative to an annular magnet along its axis, and a diagram illustrating magnetic field components at different distances D between the magnetic field sensor and the annular magnet;

[0042] FIG6 is a diagram showing the relationship between the magnetic field intensity and the distance D measured by the magnetic field sensor in the positioning method of the dental implant positioning assembly provided by the present invention.

[0043] 100. Guide plate, 110. Guide hole, 200. Ring magnet, 210. Mounting hole, 300. Guide ring, 310. Guide hole, 320. Positioning piece, 321. Circular groove, 400. Mobile phone, 410. Machine head, 420. Cutting head, 500. Guide mechanism, 510. Guide column, 520. Support body, 521. Support surface, 600. Magnetic field sensor. DETAILED DESCRIPTION

[0044] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0045] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0046] In the description of the present invention, if there are words such as "several", it means one or more, and "more" means more than two. Greater than, less than, and exceed are understood as not including the number itself, and above, below, and within are understood as including the number itself.

[0047] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0048] 1 and 2 , the dental implant positioning assembly of the present invention is implemented as follows:

[0049] The dental implant positioning assembly includes a guide plate 100 , an annular magnet 200 , a guide ring 300 , a mobile phone 400 , a guide mechanism 500 , and a magnetic field sensor 600 .

[0050] The guide plate 100 is made of a transparent resin material. It is designed by computer-aided design based on X-ray, CT scan or oral scan images of the patient's mouth, and is manufactured by computer-aided manufacturing technology through 3D printing.

[0051] According to the scanned image of the patient's mouth, a corresponding guide hole 110 is designed for the position of the implant cavity to be prepared in the patient's mouth. The guide hole 110 passes through the guide plate 100 in the up and down directions, and the axis of the guide hole 110 coincides with the axis of the implant cavity to be prepared in the patient's mouth.

[0052] The shape of the annular magnet 200 matches the shape of the guide hole 110 . The guide hole 110 is a circular hole. The annular magnet 200 is installed in the guide hole 110 . The outer wall of the annular magnet 200 is bonded to the inner wall of the guide hole 110 by an adhesive.

[0053] The upper and lower end faces of the annular magnet 200 are parallel to each other. The annular magnet 200 is provided with a mounting hole 210 that passes through in the up and down directions. The axis of the mounting hole 210 coincides with the axis of the guide hole 110, so that the axis of the mounting hole 210 coincides with the axis of the implant cavity that the patient needs to prepare.

[0054] Referring to Figure 5, the magnetic field generated by annular magnet 200 is rotationally symmetric about its axis. That is, the magnetic field intensity generated by annular magnet 200 varies along its axis. Theoretically, the magnetic field generated by annular magnet 200 gradually decreases outward from the axis. Figure 5 can be derived by simulating the magnetic field components of the magnetic field generated by annular magnet 200 that gradually vary outward from the axis. If the sensor used to measure magnetic field intensity rotates around the axis of annular magnet 200, the magnetic field intensity measured by the sensor remains approximately the same.

[0055] The guide ring 300 is inserted into the mounting hole 210 of the annular magnet 200 . The outer wall of the guide ring 300 is bonded to the inner wall of the mounting hole 210 by adhesive. The top surface of the guide ring 300 is parallel to the top surface of the annular magnet 200 .

[0056] A guide hole 310 is provided in the middle of the guide ring 300 and passes through in the up and down directions. The axis of the guide hole 310 coincides with the axis of the mounting hole 210, that is, the axis of the guide hole 310 coincides with the axis of the implant cavity that the patient needs to prepare.

[0057] A positioning piece 320 is provided on the top surface of the guide ring 300. The positioning piece 320 is in the shape of an upwardly protruding ring. The positioning piece 320 surrounds the outer circumference of the guide hole 310. The positioning piece 320 forms a circular groove 321 around the outer circumference of the guide hole 310. The axis of the circular groove 321 coincides with the axis of the guide hole 310, that is, the axis of the circular groove 321 coincides with the axis of the implant cavity that the patient needs to prepare.

[0058] The head of the mobile phone 400 is provided with a handpiece 410. The mobile phone 400 drives a rotating component inside the handpiece 410 by pneumatic or electric means. The rotating component of the handpiece 410 is detachably connected to the cutting head 420, and the rotating component of the handpiece 410 drives the cutting head 420 to rotate about an axis. In this embodiment, the cutting head 420 is a drill bit.

[0059] The guide mechanism 500 includes two guide posts 510 and a support body 520. The two guide posts 510 are arranged in parallel. The machine head 410 is provided with two mounting holes extending along the axis of the cutter head 420. The two mounting holes are located on opposite sides of the cutter head 420. The two guide posts 510 are disposed in a one-to-one correspondence within the two mounting holes. The guide posts 510 slide along the axis of the mounting holes, i.e., they slide along the axis of the cutter head 420.

[0060] One end of the guide post 510 slides in the assembly hole, and the other end of the guide post 510 is connected to the support body 520. The guide post 510 slides along the assembly hole and drives the support body 520 to slide relative to the cutter head 420. The support body 520 is annular and surrounds the outer circumference of the cutter head 420. The side of the support body 520 facing away from the machine head 410 is a support surface 521, and the axis of the cutter head 420 is perpendicular to the support surface 521.

[0061] The support body 520 is made of magnetic metal, and the support body 520 and the annular magnet 200 can attract each other.

[0062] The shape of the support body 520 matches the shape of the circular groove 321 surrounded by the positioning member 320. The axis of the support body 520 coincides with the axis of the cutter head 420. The doctor holds the mobile phone 400 and inserts the support body 520 into the circular groove 321. After the support body 520 is attracted by the annular magnet 200, the support body 520 can be guided to fall into the circular groove 321. When the support surface 521 abuts against the top surface of the guide ring 300, the support surface 521 coincides with the top surface of the guide ring 300. The axis of the guide hole 310 is perpendicular to the support surface 521, and the axis of the cutting head 420 is parallel to the axis of the guide hole 310. Moreover, since the axis of the circular groove 321 coincides with the axis of the guide hole 310, the axis of the cutting head 420 coincides with the axis of the support body 520, so that the axis of the cutting head 420 coincides with the axis of the guide hole 310, thereby making the axis of the cutting head 420 coincide with the axis of the implant cavity that needs to be prepared for the patient, and positioning the angle and position of the cutting head 420.

[0063] The magnetic field sensor 600 is located on the end surface of the handpiece 410 facing the cutter head 420. It is used to measure magnetic field strength. The magnetic field sensor 600 is a device that converts various magnetic fields and their variations into electrical signals for output. The magnetic field sensor 600 can be a thin-film magnetoresistive sensor, a magnetoresistive sensor, or an eddy-current sensor. In this embodiment, the magnetic field sensor 600 is a Hall effect sensor, a type of magnetic field sensor based on the Hall effect. The Hall effect voltage varies with magnetic field strength: the stronger the magnetic field, the higher the voltage, and the weaker the field, the lower the voltage. The Hall effect voltage is very small, typically only a few millivolts, but amplified by the amplifier in the integrated circuit, it can be amplified to a level sufficient to output a strong signal. This signal can then be transmitted to a display capable of displaying the corresponding value, allowing for direct observation of the magnetic field strength. Alternatively, the signal can be transmitted to the controller of the mobile phone 400, which can be set to a stop value. If the signal exceeds the stop value, the controller controls the mobile phone 400 to stop the cutter head 420.

[0064] When the doctor holds the mobile phone 400 and moves the cutting head 420 to the position in the patient's mouth where the implant cavity needs to be prepared, the support surface 521 of the support body 520 abuts against the top surface of the guide ring 300, so that the guide mechanism 500 and the guide ring 300 are relatively fixed, and the handpiece 410 moves relative to the guide column 510. The direction of movement of the handpiece 410 is parallel to the axis of the guide hole 310, that is, the cutting head 420 moves along the axis of the guide hole 310, and the rotating cutting head 420 cuts the patient's alveolar bone to prepare the implant cavity.

[0065] In addition, the magnetic field sensor 600 measures the magnetic field strength generated by the annular magnet 200. As the magnetic field sensor 600 continues to approach the annular magnet 200, referring to Figures 4 to 5, the smaller the distance between the magnetic field sensor 600 and the annular magnet 200, the greater and more accurate the magnetic field strength measured by the magnetic field sensor 600.

[0066] The magnetic field sensor 600 on the handpiece 410 measures the magnetic field strength generated by the annular magnet 200 in the guide plate 100. Since the annular magnet 200 surrounds the outer circumference of the guide hole 310, the magnetic field generated by the annular magnet 200 is rotationally symmetrical along its axis, that is, the magnetic field strength generated by the annular magnet 200 changes along the direction of the axis, that is, the change in the distance between the magnetic field sensor 600 and the end face of the annular magnet 200 will change the magnetic field strength measured by the magnetic field sensor 600. Even if the doctor rotates the mobile phone 400 around the axis of the cutting head 420 to adjust the posture of the handpiece 410, the magnetic field sensor 600 on the handpiece 410 rotates around the guide hole 310 in the middle of the annular magnet 200 as the axis, and the magnetic field strength measured by the magnetic field sensor 600 remains unchanged. Therefore, the cutting head 420 moves along the axis of the guide hole 310 and thus changes the magnetic field strength measured by the magnetic field sensor 600. The drilling depth of the cutting head 420 can be judged by the magnetic field strength measured by the magnetic field sensor 600, so that the depth of the prepared implant cavity is more accurate.

[0067] In some embodiments, it is only necessary to design the axis of the guide hole 310 to coincide with the axis of the implant cavity that the patient needs to prepare, and set a guide cylinder on the bottom surface of the head 410. The shape of the guide cylinder matches the shape of the guide hole 310. After the guide cylinder is inserted into the guide hole 310, the axis of the cutting head 420 coincides with the axis of the implant cavity that the patient needs to prepare, and the cutting direction of the cutting head 420 is also guided.

[0068] In some embodiments, the guide mechanism 500 can take various forms. For example, the guide mechanism 500 can be configured as a cylinder that can slide along the axis of the cutter head 420, and the top of the guide ring 300 is provided with a stopper hole that mates with the cylinder. The cross-section of the cylinder is polygonal, and the shape of the stopper hole matches the outer shape of the cylinder. When the cylinder is inserted into the stopper hole, the rotation of the cutter head 410 relative to the guide ring 300 is restricted, and the axis of the cutter head 420 coincides with the axis of the guide hole 310, guiding the cutting direction of the cutter head 420. Alternatively, the guide mechanism 500 can be composed of multiple cylinders that extend along the axis of the cutter head 420, and the top surface of the guide ring 300 is provided with multiple stopper holes. The multiple stopper holes correspond to the positions of the multiple cylinders. When the multiple cylinders are inserted into the stopper holes, the axis of the cutter head 420 coincides with the axis of the guide hole 310, guiding the cutting direction of the cutter head 420.

[0069] 3 to 6 , the positioning method of the dental implant positioning assembly of the present invention is described in the following embodiments:

[0070] A positioning method comprises the following steps:

[0071] S1. Taking the depth of the cutter head 420 passing through the guide hole as the cutting depth, record the magnetic field strength measured by the magnetic field sensor 600 at multiple different cutting depths, and generate a corresponding relationship between the cutting depth and the magnetic field strength.

[0072] The length of the cutter head 420 is set to L1, the depth from the end face of the annular magnet 200 to the bottom face of the guide plate 100 is set to L2, the distance between the measuring head 410 and the end face of the annular magnet 200 is set to L3, and the cutting depth is set to L4, then L4=L1-L2-L3.

[0073] S2. Design the implant cavity depth. The cutting depth is equal to the implant cavity depth. According to the above correspondence, find the magnetic field strength corresponding to the implant cavity depth. This magnetic field strength is the stop value.

[0074] S3. Fix the guide plate 100 and insert the cutter head 420 into the guide hole 310 until the magnetic field intensity measured by the magnetic field sensor 600 is not less than the stop value.

[0075] The mobile phone is also provided with a controller. The magnetic field sensor 600 sends the measured magnetic field strength to the controller in the form of an electrical signal and inputs the stop value into the controller. When the magnetic field strength received by the controller is not less than the stop value, the controller controls the mobile phone to stop rotating the cutter head 420.

[0076] Specifically, during actual operation, the guide plate 100 is designed according to the patient's oral morphology, the guide plate 100, the annular magnet 200, and the guide ring 300 are assembled, and then the distance L2 between the top surface of the annular magnet 200 and the bottom surface of the guide plate 100 is found according to the designed structure.

[0077] Select the corresponding blade head 420 according to the implant cavity that needs to be prepared for the patient, and record the length of the blade head 420 as L1.

[0078] First, fix the guide plate 100 in position with a bracket. The doctor holds the mobile phone 400 and inserts the blade head 420 into the guide hole 310. Insert the support body 520 into the circular groove 321 surrounded by the top positioning piece 320 of the guide ring 300, so that the support surface 521 of the support body 520 is against the top surface of the guide ring 300, thereby fixing the guide mechanism 500 and the guide ring 300 relatively.

[0079] Referring to Figures 3 and 4 , the tool head 420 is moved along the axis of the guide hole 310. After each movement, the distance between the bottom end surface of the tool head 410 and the top surface of the annular magnet 200 is measured as L3. That is, the distance between the magnetic field sensor 600 and the top surface of the annular magnet 200 is D = L3. The magnetic field intensity measured by the magnetic field sensor 600 after each movement is recorded. The tool head 420 is moved 1 mm at a time, and the magnetic field intensity is recorded for each movement. Referring to Figure 6 , an image is plotted with the distance D or L3 from the magnetic field sensor 600 to the top surface of the annular magnet 200 as the horizontal axis and the magnetic field intensity as the vertical axis.

[0080] Referring to FIG3 , the cutting depth L4 of the cutter head 420 is calculated as L1-L2-L3. Furthermore, FIG6 shows a corresponding relationship between the cutting depth L4 and the magnetic field strength. Since the implant cavity depth is equal to the cutting depth L4, the magnetic field strength corresponding to the implant cavity depth is determined based on this corresponding relationship as the stopping value. For example, if the cutting depth L4 = 20 mm, and the length of the cutter head 420 is L1, and the distance between the top surface of the annular magnet 200 and the bottom surface of the guide plate 100 is L2, both of which are fixed values, then the value of L3 can be obtained from L3 = L1-L2-L4. The magnetic field strength corresponding to L3 in FIG6 is the stopping value.

[0081] The stop value is input into the controller of the mobile phone 400, and the controller can control the cutter head 420 to stop rotating. The controller is electrically connected to the magnetic field sensor 600. When the magnetic field strength measured by the magnetic field sensor 600 is not less than the stop value, the controller controls the cutter head 420 to stop rotating.

[0082] The guide plate 100 is then installed in the patient's mouth so that the guide hole 310 of the guide ring 300 is aligned with the position where the patient needs to prepare the implant cavity. When the doctor holds the mobile phone 400 and moves the cutter head 420 to the position in the patient's mouth where the implant cavity needs to be prepared, the support surface 521 of the support body 520 abuts against the top surface of the guide ring 300, so that the guide mechanism 500 and the guide ring 300 are relatively fixed, and the handpiece 410 moves relative to the guide column 510. The direction of movement of the handpiece 410 is parallel to the axis of the guide hole 310, that is, the cutter head 420 moves along the axis of the guide hole 310, and the rotating cutter head 420 cuts the patient's alveolar bone to prepare the implant cavity.

[0083] The doctor pushes the handpiece 410 to move the cutting head 420 along the axis of the guide hole 310 toward the patient's alveolar bone, so that the cutting depth L4 continues to increase until the magnetic field strength measured by the magnetic field sensor 600 is equal to or greater than the stop value. The controller then controls the cutting head 420 to stop, completing the preparation of the implant cavity.

[0084] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A dental implant positioning assembly, characterized in that: include: A guide plate having a guide hole; an annular magnet, which is arranged in the guide hole, and the annular magnet is provided with a mounting hole; A guide ring, which is arranged in the mounting hole, and the guide ring is provided with a through guide hole; A mobile phone having a handpiece equipped with a cutter head; and A magnetic field sensor is arranged on the tool head, and the tool head moves along the guide hole so that the magnetic field intensity measured by the magnetic field sensor changes.

2. The dental implant positioning assembly according to claim 1, characterized in that: The end face of the guide ring is perpendicular to the axis of the guide hole. The dental implant positioning assembly also includes a guide mechanism, which is slidably connected to the machine head. The sliding direction of the guide mechanism is parallel to the axis of the cutter head. A support surface is provided on the side of the guide mechanism facing away from the machine head. The support surface abuts against the end face of the guide ring so that the movement trajectory of the cutter head relative to the guide plate is parallel to the axis of the guide hole.

3. The dental implant positioning assembly according to claim 2, characterized in that: The end surface of the guide ring is also provided with a positioning piece, and the side wall of the positioning piece abuts against the side wall of the guide mechanism so that the axis of the cutter head coincides with the axis of the guide hole.

4. The dental implant positioning assembly according to claim 3, characterized in that: The positioning member surrounds the outer circumference of the guide hole, and the guide mechanism includes: a guide post slidably connected to the machine head; and A support body is connected to the guide column, the support surface is arranged on the side of the support body facing away from the machine head, and the outer contour of the support body matches the shape surrounded by the positioning piece.

5. The dental implant positioning assembly according to claim 4, characterized in that: The positioning member forms a circular groove, the axis of the guide hole coincides with the axis of the circular groove, the support body is in a circular ring shape, and the axis of the support body coincides with the axis of the cutter head.

6. The dental implant positioning assembly according to claim 4, characterized in that: The support body is a magnetic body.

7. The dental implant positioning assembly according to claim 1, characterized in that: The axis of the guide hole is perpendicular to the end surface of the annular magnet.

8. A positioning method, applicable to the dental implant positioning assembly according to any one of claims 1 to 7, characterized in that: The positioning method comprises the following steps: S1, the depth of the cutter head passing through the guide hole is the cutting depth, and the magnetic field strength measured by the magnetic field sensor at multiple cutting depths is recorded to form a corresponding relationship between the cutting depth and the magnetic field strength; S2, designing the implantation hole depth, the cutting depth is equal to the implantation hole depth, and finding the magnetic field intensity corresponding to the implantation hole depth as the stop value according to the corresponding relationship; S3. Fix the guide plate and extend the cutter head into the guide hole until the magnetic field strength measured by the magnetic field sensor is not less than the stop value.

9. The positioning method according to claim 8, characterized in that: In step S1, the length of the cutter head is L1, the depth from the end face of the annular magnet to the bottom face of the guide plate is L2, the distance between the machine head and the end face of the annular magnet is L3, the cutting depth is L4, and L4=L1-L2-L3.

10. The positioning method according to claim 8, characterized in that: The mobile phone also includes a controller, and the magnetic field sensor sends the measured magnetic field strength to the controller in the form of an electrical signal. In step S3, the stop value is input to the controller. When the magnetic field strength is not less than the stop value, the controller controls the mobile phone to stop rotating the cutter head.

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