Denture diagnostic gnathostatic facebow

Abstract

This utility model provides a maxillofacial bow for denture diagnosis, relating to the field of facial bow technology. It includes a support frame with a nose support assembly in its center; symmetrically arranged first L-shaped arms and second L-shaped arms, each with a first earplug at its front end and a second earplug at its front end; a linkage adjustment mechanism comprising a gear located at the center of the support frame, and a first rack and a second rack meshing with the gear, wherein the first rack connects to the first L-shaped arm and the second rack connects to the second L-shaped arm; the first L-shaped arm has a first clearance groove for accommodating the second rack, and the second L-shaped arm has a second clearance groove for accommodating the first rack; an adjustment knob is coaxially fixed to the gear, and its rotation drives the first rack and the second rack to move in opposite directions, achieving synchronous opening and closing adjustment of the first and second L-shaped arms. The advantages of this utility model are synchronous expansion on both sides, uniform force distribution, no deviation, high precision, and good stability.

Description

Technical Field

[0001] This utility model relates to the field of face bow technology, and in particular to a jawbone face bow for denture diagnosis. Background Technology

[0002] With the rapid development of oral medicine technology, and to better serve patients, dentists have developed the fully anatomical facebow based on the Powell triangle theory to obtain accurate occlusal relationships between the maxilla and mandible, and to facilitate standardized data acquisition during denture fabrication. The process involves fixing the facebow to the patient's face, recording the condylar position, and then performing other procedures. Facebows typically come with a transfer device. In clinical treatment, the facebow can accurately determine various occlusal relationships, making it an indispensable standard tool for complete denture fabrication and orthodontic treatment. Based on this fundamental theory, the facebow was born—a highly efficient, accurate, and simple auxiliary tool.

[0003] Many existing facebows suffer from problems during patient measurements and measurement relationship determination, including centric misalignment, slippage, instability, lateral imbalance, and non-horizontal placement. Furthermore, data inaccuracies can arise due to the dentist's usage habits. This is particularly problematic in complex cases requiring more precise data for treatment planning, where existing facebows demand significant dentist experience and practical skills. Therefore, this paper proposes a jawbow for prosthesis diagnosis that comprehensively addresses these issues.

[0004] Authorization notice number CN221672105U discloses an improved dental facebow, the technical solution of which is: "including a central adjustment frame, a straight nasal support rod extending upward from the top surface of the central adjustment frame fixed in the middle of the central adjustment frame, a nasal support rod extending forward and backward installed on the nasal support rod, a nasal support fixed at the front end of the nasal support rod, a sliding groove extending left and right formed in the middle of the central adjustment frame, and the transverse rods of the two L-shaped side supports inserted into the sliding groove, the two transverse rods being close together front and back and inserted into the sliding groove and cooperating with the sliding groove." Its usage is: "after loosening all the locking bolts, the two transverse rods can be pulled outward to adjust the distance between the two connecting parts of the two transverse rods." That is, this facebow adjusts the distance between the two external auditory canal support balls by directly pulling the transverse rods outward. However, this method can easily lead to asynchronous expansion or uneven force on both sides, and even deviation, affecting the stability of use and the accuracy of data acquisition. Therefore, it is necessary to disclose a novel maxillofacial bow to overcome the aforementioned defects. Utility Model Content

[0005] This invention overcomes the shortcomings of the prior art and provides a maxillofacial bow for denture diagnosis, which has the advantages of uniform force distribution, no displacement, and good stability.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] A maxillofacial bow for denture diagnosis includes a support frame with a nasal support component disposed in the middle.

[0008] The first L-shaped arm and the second L-shaped arm are symmetrically arranged and can be slidably mounted on both sides of the support frame via a guide rail mechanism. The first L-shaped arm has a first earplug at its front end and the second L-shaped arm has a second earplug at its front end.

[0009] The linkage adjustment mechanism includes a gear located at the center of the support frame, a first rack and a second rack meshing with the gear, wherein the first rack is connected to the first L-shaped arm and the second rack is connected to the second L-shaped arm;

[0010] The first L-shaped arm is provided with a first clearance groove for accommodating the second rack, and the second L-shaped arm is provided with a second clearance groove for accommodating the first rack.

[0011] The adjustment knob is fixed coaxially with the gear. When rotated, it drives the first rack and the second rack to move in opposite directions, so as to realize the synchronous opening and closing adjustment of the first L-shaped arm and the second L-shaped arm.

[0012] Furthermore, the first L-shaped arm includes a first forearm that is slidably connected to the front end, and the second L-shaped arm includes a second forearm that is slidably connected to the front end; the first forearm and the second forearm are provided with a first screw hole, and the first L-shaped arm and the second L-shaped arm are respectively provided with an elliptical hole, and the first fixing screw passes through the elliptical hole and is connected to the first screw hole.

[0013] Furthermore, both the first and second forearms are provided with three earplug mounting holes for mounting the first and second earplugs respectively, and the center line connecting the three earplug mounting holes forms a right-angled triangle.

[0014] Furthermore, the nose pad support component includes a nose pad face bow connecting rod, the upper end of which is slidably inserted with a nose pad outer rod, the nose pad outer rod being connected to a nose pad inner rod, and the nose pad inner rod being connected to a plastic nose pad. The contact surface of the plastic nose pad has a composite curved surface conforming to the anatomical shape of the nasal wing. It also includes a second fixing screw, which is threaded onto the nose pad face bow connecting rod, and its lower end is movably connected to the nose pad outer rod. The support frame is provided with an insertion position, the lower end of the nose pad face bow connecting rod is inserted into the insertion position, and the lower end of the nose pad face bow connecting rod is threaded onto a third fixing screw. The insertion position is provided with a slot that corresponds to the third fixing screw.

[0015] Furthermore, the support frame includes a bottom cover and a top cover that are fitted together, and the guide rail mechanism includes a first guide rail and a second guide rail located on the bottom cover. A first L-shaped arm is slidably connected to the first guide rail, and a second L-shaped arm is slidably connected to the second guide rail. Anti-wear blocks are respectively provided on both sides of the bottom cover.

[0016] Furthermore, the system includes a universal joint body, which comprises an upper support and a lower support that are rotatably disposed relative to each other, and a tensioning screw that passes through the upper support and connects to the lower support. The upper support is rotatably connected to a positioning block via a ball joint, and the top cover is provided with an assembly position that overlaps the positioning block. A fourth fixing screw passes through the assembly position and connects to the positioning block. The lower support is rotatably connected to a jaw fork support via a ball joint, and also includes a jaw fork and a fifth fixing screw that passes through the jaw fork and connects to the jaw fork support.

[0017] Furthermore, the jaw fork support is provided with an anti-misalignment insertion structure, and the jaw fork is provided with a limiting socket that corresponds to the anti-misalignment insertion structure.

[0018] Furthermore, a level calibrator is provided on the adjustment knob.

[0019] Furthermore, a sixth fixing screw is threaded onto the top cover, the sixth fixing screw passing through the top cover and abutting against the first L-shaped arm or the second L-shaped arm.

[0020] Furthermore, the Shore hardness of the plastic nose pad is 70-80 HA.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] This invention controls the rotation of gears by rotating an adjustment knob, thereby driving the first rack and the second rack to move in opposite directions, achieving synchronous opening and closing adjustment of the first L-shaped arm and the second L-shaped arm. In other words, it simultaneously controls the first earplug and the second earplug to move closer to the ear or separate from the ear after measurement. The expansion on both sides is synchronous, the force is even, and there is no deviation. Furthermore, the gear and rack drive method provides high precision and good stability. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments of the present invention, are used to explain the present invention. They do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is the three-dimensional representation of the jawbone facial arch described in this utility model. Figure 1 ;

[0025] Figure 2 This is the three-dimensional representation of the jawbone facial arch described in this utility model. Figure 2;

[0026] Figure 3 This is a schematic diagram showing the nose pad support component in a detached state;

[0027] Figure 4 This is a schematic diagram of the bottom cover and top cover separated in the support frame;

[0028] Figure 5 This is a schematic diagram showing the first L-shaped arm, the second L-shaped arm, and the bottom cover in a separated state;

[0029] Figure 6 This is a schematic diagram of the main body of the universal joint.

[0030] In the picture:

[0031] 1. Support frame; 101. Insertion; 1011. Slot; 102. Bottom cover; 103. Top cover; 1031. Assembly position; 2. Nose pad support assembly; 201. Nose pad facebow connecting rod; 202. Outer rod of nose pad rod; 203. Inner rod of nose pad rod; 204. Plastic nose pad; 205. Second fixing screw; 206. Third fixing screw; 3. First L-shaped arm; 301. First clearance groove; 302. First forearm; 4. Second L-shaped arm; 401. Second forearm; 5. First earplug; 6. Second earplug; 7. Gear; 8. First rack; 9. 10. Two-tooth rack; 11. First screw hole; 12. Oval hole; 13. First fixing screw; 14. Earplug mounting hole; 15. First guide rail; 16. Anti-wear block; 17. Universal joint body; 1701. Upper support; 1702. Lower support; 18. Tightening screw; 19. Positioning block; 20. Fourth fixing screw; 21. Jaw fork support seat; 2101. Anti-misalignment insertion structure; 22. Jaw fork; 2201. Limiting socket; 23. Fifth fixing screw; 24. Level calibrator; 25. Sixth fixing screw; 26. Adjustment knob. Detailed Implementation

[0032] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0033] like Figures 1 to 6As shown, this utility model claims protection for a maxillofacial bow for denture diagnosis, including a support frame 1, in which a nose support assembly 2 is provided in the middle; specifically, the nose support assembly includes a nose face bow connecting rod 201, the upper end of which is slidably inserted with a nose support rod outer rod 202, specifically, the upper end of the nose face bow connecting rod 201 is provided with a perforation, and the nose support rod outer rod 202 is slidably sleeved in the perforation; the nose support rod outer rod 202 is connected to the nose support rod inner rod 203, and the nose support rod inner rod 203 is connected to a plastic nose support 204, the plastic nose support 204 contact The surface is provided with a composite curved surface that conforms to the anatomical shape of the nasal wing. When in use, the contact surface of the plastic nose pad 204 is in contact with the nose. It also includes a second fixing screw 205, which is threaded to the nose pad face bow connecting rod 201. Its lower end is movably connected to the outer rod 202 of the nose pad rod. That is, the second fixing screw 205 is longitudinally threaded to the upper end of the nose pad face bow connecting rod 201 and screwed to the outer rod 202 of the nose pad rod. After adjusting the position of the outer rod 202 of the nose pad rod, the second fixing screw 205 is tightened and pressed against the outer rod 202 of the nose pad rod to fix it.

[0034] The support frame 1 is provided with an insertion slot 101. The lower end of the nose bridge connecting rod 201 is inserted into the insertion slot 101. The lower end of the nose bridge connecting rod 201 is threadedly connected to a third fixing screw 206. The insertion slot 101 is provided with a slot 1011 that corresponds to the third fixing screw 206. Therefore, after adjusting the insertion depth of the lower end of the nose bridge connecting rod 201 in the insertion slot 101, tightening the third fixing screw 206 onto the slot 1011 will fix the nose bridge connecting rod 201. Thus, through the above adjustments, the height and extension length of the plastic nose bridge 204 can be adjusted according to different users.

[0035] The Shore hardness of the plastic nose pad 204 is 70-80HA. In this embodiment, the Shore hardness of the plastic nose pad 204 is 75HA, which is moderate and meets the requirements of softness and support hardness.

[0036] The first L-shaped arm 3 and the second L-shaped arm 4 are symmetrically arranged on the support frame 1 and are slidably mounted on both sides of the support frame 1 via a guide rail mechanism. Specifically, the support frame 1 includes a bottom cover 102 and a top cover 103 that are covered together. The guide rail mechanism includes a first guide rail 14 and a second guide rail 15 located on the bottom cover 102. The first L-shaped arm 3 is slidably connected to the first guide rail 14, and the second L-shaped arm 4 is slidably connected to the second guide rail 15. This makes the stability of the first L-shaped arm 3 and the second L-shaped arm 4 better and less prone to deviation when sliding due to the restriction of the guide rail. Anti-wear blocks 16 are respectively provided on both sides of the bottom cover 102. The anti-wear blocks 16 are made of wear-resistant rubber material, which makes this part less prone to wear during the movement of the first L-shaped arm 3 and the second L-shaped arm 4, thus extending the service life.

[0037] The first L-shaped arm 3 has a first earplug 5 at its front end, and the second L-shaped arm 4 has a second earplug 6 at its front end. The first earplug 5 and the second earplug 6 are used to be inserted into the left and right ears for fixation. The first forearm 302 and the second forearm 401 are each provided with three earplug mounting holes 13 for installing the first earplug 5 and the second earplug 6, respectively. The first earplug 5 and the second earplug 6 can be fixed in the earplug mounting holes 13 by interference fit or threaded connection. The center line of the three earplug mounting holes 13 forms a right-angled triangle shape and is evenly distributed. It can be selected according to the actual needs of different people.

[0038] It also includes a linkage adjustment mechanism, comprising a gear 7 located at the center of the support frame 1, a first rack 8 and a second rack 9 meshing with the gear 7, wherein the first rack 8 is connected to the first L-shaped arm 3 and the second rack 9 is connected to the second L-shaped arm 4; the first L-shaped arm 3 is provided with a first clearance groove 301 to accommodate the second rack 9, and the second L-shaped arm 4 is provided with a second clearance groove to accommodate the first rack 8. The first clearance groove 301 and the second clearance groove make the overall structure compact and do not affect the movement of the first L-shaped arm 3 and the second L-shaped arm 4.

[0039] The adjustment knob 26 passes through the top cover 103 and is coaxially fixed with the gear 7. When rotated, it drives the first rack 8 and the second rack 9 to move in opposite directions, realizing the synchronous opening and closing adjustment of the first L-shaped arm 3 and the second L-shaped arm 4. In this way, the synchronous movement of the first L-shaped arm 3 and the second L-shaped arm 4 can be controlled simultaneously, so that the expansion on both sides is synchronized, the force is even, and there is no deviation.

[0040] The first L-shaped arm 3 includes a first forearm 302 slidably connected to the front end, and the second L-shaped arm 4 includes a second forearm 401 slidably connected to the front end. The first forearm 302 and the second forearm 401 are provided with first screw holes 10, and the first L-shaped arm 3 and the second L-shaped arm 4 are respectively provided with elliptical holes 11. The first fixing screw 12 passes through the elliptical hole 11 and is connected to the first screw hole 10. That is, the first forearm 302 and the second forearm 401 can be adjusted by moving relative to the first L-shaped arm 3 and the second L-shaped arm 4. After the position is adjusted, the first fixing screw 12 passes through the elliptical hole 11 and is connected to the first screw hole 10 to fix it.

[0041] The system includes a universal joint body 17, which comprises an upper support 1701 and a lower support 1702 that are rotatably disposed relative to each other. It also includes a tightening / loosening knob 18, which passes through the upper support 1701 and connects to the lower support 1702. When the tightening / loosening knob 18 is released, the upper support 1701 and the lower support 1702 can rotate relative to each other; when the tightening / loosening knob 18 is tightened, the upper support 1701 and the lower support 1702 cannot rotate relative to each other. Specifically... One end of the inner end of the tightening screw 18 can be threaded into the lower support 1702. The tightening screw 18 has a stepped pressure surface corresponding to the upper support 1701. When the tightening screw 18 is tightened and inserted into the lower support 1702, the stepped pressure surface of the tightening screw 18 presses the upper support 1701 tightly, so the upper support 1701 and the lower support 1702 cannot rotate relative to each other. When the tightening screw 18 is loosened, the pressure on the upper support 1701 is released, and the two can rotate again.

[0042] The upper support 1701 is rotatably connected to a positioning block 19 via a ball joint. The top cover 103 is provided with an assembly position 1031, which overlaps the positioning block 19 for stable installation. A fourth fixing screw 20 passes through the assembly position 1031 and connects to the positioning block 19, thereby fixing the support frame 1 to the upper support 1701. The lower support 1702 is rotatably connected to a jaw fork support 21 via a ball joint, and also includes a jaw fork 22 and a fifth fixing screw 23. The fifth fixing screw 23 passes through the jaw fork 22 and connects to the jaw fork support 21. The jaw fork support 21 is provided with an anti-misalignment insertion structure 2101, and the jaw fork 22 is provided with a limiting socket 2201 that corresponds to the anti-misalignment insertion structure 2101. The jaw fork 22 is inserted into the anti-misalignment insertion structure 2101 by aligning the limiting socket 2201 with the jaw fork 22, and the fifth fixing screw 23 is tightened to fix the two together.

[0043] In this embodiment, a level calibrator 24 is provided on the adjustment knob 26. The level calibrator 24 is a circular bubble level, which can ensure the horizontal position of the device during the measurement process, making it more intuitive and convenient.

[0044] A sixth fixing screw 25 is threaded onto the top cover 103. The sixth fixing screw 25 passes through the top cover 103 and abuts against either the first L-shaped arm 3 or the second L-shaped arm 4. In this embodiment, the sixth fixing screw 25 corresponds to the second L-shaped arm 4. After adjusting the positions of the first L-shaped arm 3 and the second L-shaped arm 4, the sixth fixing screw 25 is pressed against the second L-shaped arm 4 to fix it. As can be seen from the above, since the second L-shaped arm 4 and the first L-shaped arm 3 are linked by gear and rack meshing, fixing the second L-shaped arm 4 also fixes the first L-shaped arm 3.

[0045] This invention controls the rotation of gear 7 by rotating the adjustment knob 26, thereby driving the first rack 8 and the second rack 9 to move in opposite directions, realizing the synchronous opening and closing adjustment of the first L-shaped arm 3 and the second L-shaped arm 4. That is, it simultaneously controls the first earplug 5 and the second earplug 6 to move closer to the ear or separate from the ear after the measurement is completed. The expansion on both sides is synchronous, the force is even, and there will be no deviation. Moreover, the gear and rack drive method has high precision and good stability.

[0046] The method of using this utility model is as follows:

[0047] The doctor needs to operate the bow horizontally and use the rotating adjustment knob 26 to control the approach of the first L-shaped arm 3 and the second L-shaped arm 4 so that the first earplug 5 and the second earplug 6 can be inserted into the patient's ear. The first L-shaped arm 3 and the second L-shaped arm 4 can be marked with scales so that the extension length of the two can be seen. Then, the sixth fixing screw 25 is tightened to fix it.

[0048] After completing the above operations, adjust the nose support component 2. Adjust the height and extension length of the plastic nose pad 204 to fit the plastic nose pad 204 tightly against the symmetrical center of the eyes and the bridge of the nose, with the face arch at the orbital plane. After adjusting to the appropriate position, tighten and fix the second fixing screw 205 and the third fixing screw 206.

[0049] After completing the above actions, the support frame 1 is fixed to the upper end of the universal joint body 17 by the fourth fixing screw 20, and the lower end of the universal joint body 17 is fixed to the jaw fork 22 on the jaw fork support seat 21 by the fifth fixing screw 23.

[0050] Insert the jaw fork 2, which has been coated with wax-type material, into the patient's mouth. The doctor will then operate according to the patient's actual condition. Once the doctor has obtained the appropriate data, tighten the tensioning screw 18 to lock the upper support 1701 and lower support 1702 in the universal joint body 17.

[0051] After completing the occlusion data, ensure the stability of the universal joint body 17, loosen the fourth fixing screw 20, and separate the universal joint body 17 from the support frame 1. Use the obtained data to make the dental mold for the next step.

[0052] Rotate the adjustment knob 26 in the opposite direction to open the first L-shaped arm 3 and the second L-shaped arm 4, then remove the face bow worn by the patient. The face bow is now in use.

[0053] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A maxillofacial bow for denture diagnosis, characterized in that: Includes a support frame (1), in which a nose support component (2) is provided in the middle. The first L-shaped arm (3) and the second L-shaped arm (4) are symmetrically arranged and can be slidably arranged on both sides of the support frame (1) through the guide rail mechanism. The first L-shaped arm (3) is provided with a first earplug (5) at the front end and the second L-shaped arm (4) is provided with a second earplug (6) at the front end. The linkage adjustment mechanism includes a gear (7) located at the center of the support frame (1), a first rack (8) and a second rack (9) meshing with the gear (7), wherein the first rack (8) is connected to the first L-shaped arm (3), and the second rack (9) is connected to the second L-shaped arm (4); the first L-shaped arm (3) is provided with a first clearance groove (301) to accommodate the second rack (9), and the second L-shaped arm (4) is provided with a second clearance groove to accommodate the first rack (8); The adjustment knob (26) is fixed coaxially with the gear (7). When rotated, it drives the first rack (8) and the second rack (9) to move in opposite directions, so as to realize the synchronous opening and closing adjustment of the first L-shaped arm (3) and the second L-shaped arm (4). The first L-shaped arm (3) includes a first forearm (302) slidably connected to the front end, and the second L-shaped arm (4) includes a second forearm (401) slidably connected to the front end; the first forearm (302) and the second forearm (401) are provided with a first screw hole (10), and the first L-shaped arm (3) and the second L-shaped arm (4) are respectively provided with an elliptical hole (11), and the first fixing screw (12) passes through the elliptical hole (11) and is connected to the first screw hole (10); The first forearm (302) and the second forearm (401) are each provided with three earplug mounting holes (13) for mounting the first earplug (5) and the second earplug (6) respectively. The center line of the three earplug mounting holes (13) forms a right triangle.

2. The maxillofacial bow for denture diagnosis according to claim 1, characterized in that: The nose support assembly includes a nose support facebow connecting rod (201), the upper end of which is slidably connected to a nose support rod outer rod (202). The nose support rod outer rod (202) is connected to a nose support rod inner rod (203), and the nose support rod inner rod (203) is connected to a plastic nose support (204). The contact surface of the plastic nose support (204) is provided with a composite curved surface conforming to the anatomical shape of the nasal wing. It also includes a second fixing screw (205). 05) The nose bridge connecting rod (201) is threaded and its lower end is movably connected to the outer rod (202) of the nose bridge rod; the support frame (1) is provided with a socket (101), the lower end of the nose bridge connecting rod (201) is inserted into the socket (101), the lower end of the nose bridge connecting rod (201) is threaded with a third fixing screw (206), and the socket (101) is provided with a slot (1011) that is used in conjunction with the third fixing screw (206).

3. The maxillofacial bow for denture diagnosis according to claim 1, characterized in that: The support frame (1) includes a bottom cover (102) and a top cover (103) that are covered together. The guide rail mechanism includes a first guide rail (14) and a second guide rail (15) located on the bottom cover (102). A first L-shaped arm (3) is slidably connected to the first guide rail (14), and a second L-shaped arm (4) is slidably connected to the second guide rail (15). Anti-wear blocks (16) are respectively provided on both sides of the bottom cover (102).

4. The maxillofacial bow for denture diagnosis according to claim 3, characterized in that: The device includes a universal joint body (17), which includes an upper support (1701) and a lower support (1702) that are rotatably disposed relative to each other, and a tensioning screw (18) that passes through the upper support (1701) and is connected to the lower support (1702). The upper support (1701) is rotatably connected to a positioning block (19) via a ball joint. The top cover (103) is provided with an assembly position (1031) that overlaps the positioning block (19). A fourth fixing screw (20) passes through the assembly position (1031) and is connected to the positioning block (19). The lower support (1702) is rotatably connected to a jaw fork support seat (21) via a ball joint, and also includes a jaw fork (22) and a fifth fixing screw (23) that passes through the jaw fork (22) and is connected to the jaw fork support seat (21).

5. The maxillofacial bow for denture diagnosis according to claim 4, characterized in that: The jaw support (21) is provided with an anti-misalignment plug-in structure (2101), and the jaw fork (22) is provided with a limiting socket (2201) that is used in conjunction with the anti-misalignment plug-in structure (2101).

6. The maxillofacial bow for denture diagnosis according to claim 1, characterized in that: A level calibrator (24) is provided on the adjustment knob (26).

7. The maxillofacial bow for denture diagnosis according to claim 3, characterized in that: The top cover (103) is threaded with a sixth fixing screw (25), which passes through the top cover (103) and abuts against the first L-shaped arm (3) or the second L-shaped arm (4).

8. The maxillofacial bow for denture diagnosis according to claim 2, characterized in that: The Shore hardness of the plastic nose pad (204) is 70-80HA.

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