Jaw fork positioning mechanism for multidimensional precise positioning of a facebow for a complete denture

Abstract

This invention discloses a jaw fork adjustment mechanism for multi-dimensional precise positioning of the facebone of a complete denture. It includes a transverse positioning slide block for connecting the facebone, a directional adjustment slide rod for mounting the jaw fork, a longitudinal adjustment slide post, and a pitch angle scale cover. The longitudinal adjustment slide post slides left and right on the transverse positioning slide block to adjust the left and right position of the jaw fork. The directional adjustment slide rod slides forward and backward and up and down on the longitudinal adjustment slide post to adjust the forward and backward and up and down positions of the jaw fork. The directional adjustment slide rod swings on the longitudinal adjustment slide post to adjust the pitch angle of the jaw fork. The left and right, forward and backward, up and down positions of the jaw fork and the pitch angle values ​​are read by a transverse scale on the transverse positioning slide block, a directional scale on the directional adjustment slide rod, a longitudinal scale on the longitudinal adjustment slide post, and a pitch angle scale on the pitch angle scale cover, respectively. This invention can obtain accurate digital coordinates of the patient's jaw plane position, improving the precision and efficiency of complete denture fabrication.

Description

Technical Field

[0001] This invention relates to a dental model, and more particularly to a jaw fork adjustment mechanism for multidimensional precise positioning of the facebone of a complete denture. Background Technology

[0002] It's impractical for dental technicians to directly align and adjust teeth in a patient's mouth when fabricating complete dentures. Therefore, dentists must record and transfer information based on the jaw relationship (the positional relationship between the upper and lower jaws when the condyles on both sides of the patient are in the physiological posterior position of the temporomandibular joint). First, the dentist records the jaw position when the patient is in centric relation, then transfers it to the dental technician's articulator, on which the technician then begins fabricating the complete dentures.

[0003] A facebow is a tool for recording and transferring jaw position relationships. This tool is based on the theory that the temporomandibular joint is likened to a hinge axis. In the temporomandibular joint, this hinge axis is the axis connecting the two condylar rotation centers. In the dental technician's hand, this hinge axis is the mechanical hinge axis on the articulator that simulates the condylar rotation movement.

[0004] There are two types of face bows: the kinetic face bow and the anatomical face bow. The kinetic face bow locates the hinge axis by recording the movement trajectory of the condyles, while the anatomical face bow uses anatomical reference points on the patient's face to estimate the position of the hinge axis. The former is theoretically more accurate, but it is more complex to operate and requires more patient cooperation, so it is mostly used in research. The latter provides an acceptable hinge axis, is simple to operate, and is more commonly used in clinical practice.

[0005] An anatomical facebow generally consists of two parts: the jaw fork and the bow body. One end of the jaw fork is fixed to the jaw support plane on the patient's alveolar bone, and the other end is connected and fixed to the crossbeam of the bow body through a position adjustment mechanism.

[0006] Traditional anatomical facebow position adjustment mechanisms fall into two categories: either double universal joint structures or tandem multi-joint adjustment mechanisms. Both simply fix the relative positions of the jaw fork and the facebow beam. Requirements for complete denture fabrication:

[0007] Ensuring that the jaw fork direction is centered on both sides of the facebone and parallel to the plane of the nose and ear relies entirely on the dentist's visual assessment. Traditional anatomical facebone adjustment mechanisms are inadequate for precise positioning. This results in significant differences in the jaw plane of the complete dentures produced, even between two experienced dentists.

[0008] Furthermore, the requirements for face bows designed for complete denture fabrication differ from those for restorative or orthodontic purposes for patients with existing dentition. In the former, because the patient lacks teeth, the occlusal plane is reconstructed based on theoretical calculations, thus requiring highly precise positioning. In the latter, because the patient already has dentition, the face bow's function is to replicate the patient's existing occlusal plane. Their purposes are fundamentally different. From this perspective, there are currently no face bows on the market specifically designed for the precise fabrication of complete dentures. Current anatomical face bows cannot achieve the precise positioning required for complete denture fabrication, resulting in low fabrication accuracy and causing considerable discomfort for patients. Summary of the Invention

[0009] To overcome the above deficiencies, the present invention provides a jaw fork adjustment mechanism for multidimensional precise positioning of a complete denture facebone. This jaw fork adjustment mechanism can accurately position the occlusal plane of the jaw fork and accurately obtain the digital coordinates of the patient's jaw plane position, which facilitates the precise fabrication of complete dentures.

[0010] The technical solution adopted by this invention to solve its technical problem is: a jaw fork adjustment mechanism for multi-dimensional precise positioning of a complete denture facebow, comprising a longitudinal adjustment slide post, a transverse positioning slide block, a directional adjustment slide rod, a pitch angle scale cover, a jaw fork, a facebow positioning connector, a transverse adjustment positioning component, and a directional adjustment positioning component. The transverse positioning slide block can be fixedly installed on the facebow's crossbeam via the facebow positioning connector. The transverse positioning slide block has an elongated transverse adjustment groove parallel to the facebow's crossbeam. The upper end of the longitudinal adjustment slide post can be slidably inserted into the transverse adjustment groove along the extension direction of the transverse adjustment groove. The transverse adjustment positioning component can fix the longitudinal adjustment slide post to the transverse positioning slide block at any transverse position.

[0011] The longitudinal adjustment slide column is provided with a long strip-shaped longitudinal adjustment slide hole extending longitudinally. One end of the directional adjustment slide rod is inserted into the longitudinal adjustment slide hole. The directional adjustment slide rod can slide along its own length and longitudinal direction within the longitudinal adjustment slide hole. The directional adjustment slide rod can also swing up and down longitudinally within the longitudinal adjustment slide hole to change its angle with the horizontal plane. The directional adjustment positioning component can be slidably installed on the side wall of the directional adjustment slide rod along its length direction. The directional adjustment positioning component can fix one end of the directional adjustment slide rod at any position and swing angle with the longitudinal adjustment slide column. The pitch angle scale cover is fixedly installed on the directional adjustment positioning component, and the pitch angle scale cover is directly opposite the swing center of one end of the directional adjustment slide rod.

[0012] The transverse positioning slide block has a transverse scale arranged along the extension direction of the transverse adjustment slide. The longitudinal adjustment slide column has a longitudinal scale arranged along the extension direction of the longitudinal adjustment slide hole. The directional adjustment slide rod has a directional scale arranged along the length direction of the directional adjustment slide rod. The pitch angle scale cover has a pitch angle scale arranged around the swing center of the directional adjustment slide rod. The upper side wall of the longitudinal adjustment slide column has a transverse indicator that can be aligned with the scale on the transverse scale. The pitch angle scale cover or directional adjustment positioning component has a longitudinal indicator that can be aligned with the scale on the longitudinal scale. The pitch angle scale cover, directional adjustment positioning component, or longitudinal adjustment slide column also has a directional indicator that can be aligned with the scale on the directional scale. The directional adjustment slide rod has a pitch angle indicator that can be aligned with the pitch angle scale.

[0013] The jaw fork is fixedly installed on the other end of the directional adjustment slide bar.

[0014] As a further improvement of the present invention, the directional adjustment positioning component includes a longitudinal positioning screw and a first positioning nut. The side wall of the longitudinal adjustment slide column is provided with an elongated longitudinal positioning slide hole extending longitudinally, and the depth direction of the longitudinal positioning slide hole is perpendicular to the depth direction of the longitudinal adjustment slide hole. The directional adjustment slide rod is provided with an elongated directional adjustment slide hole extending along its length. The longitudinal positioning screw can be slidably inserted into the longitudinal positioning slide hole and the directional adjustment slide hole respectively. The longitudinal positioning screw is threadedly connected to the first positioning nut. The head of the longitudinal positioning screw stops on the outer side wall of the longitudinal adjustment slide column. The first positioning nut and the inner side wall of the longitudinal adjustment slide hole can be tightly clamped on the two opposite sides of the directional adjustment slide rod. The pitch angle scale cover is fixedly installed on the head of the longitudinal positioning screw.

[0015] As a further improvement of the present invention, the pitch angle scale cover forms a convex arc surface concentric with the longitudinal positioning screw on the side wall facing the jaw fork, the pitch angle scale is formed on the surface of the convex arc surface, the directional adjustment slide rod is slidably fitted with a directional indicator slide sleeve along its length direction, the directional indicator slide sleeve is stopped and positioned in the circumferential direction with the directional adjustment slide rod, the directional indicator slide sleeve forms a concave arc surface on the end face facing away from the jaw fork, the concave arc surface can slide along the convex arc surface on the pitch angle scale cover with the longitudinal positioning screw axis as the center, and the pitch angle indicator is located on the side wall of the directional indicator slide sleeve.

[0016] As a further improvement of the present invention, a chin base indicator rod and a chin base indicator positioning component are also provided. One end of the chin base indicator rod can be slidably inserted into the longitudinal adjustment groove hole, and the other end of the chin base indicator rod can be directly aligned with the chin base position of the human body. The chin base indicator positioning component can fix one end of the chin base indicator rod and the longitudinal adjustment groove column at any longitudinal position. The chin base indicator rod or the chin base indicator positioning component is also provided with a chin base indicator mark that can be directly aligned with the scale on the longitudinal scale.

[0017] As a further improvement of the present invention, the chin base indicator positioning component includes a chin base indicator rod positioning screw, a second positioning nut, and a chin base indicator rod locking screw. A neck is formed between the head of the chin base indicator rod positioning screw and the stud. The neck of the chin base indicator rod positioning screw is circumferentially stopped and slidably inserted into a longitudinal positioning groove hole. A chin base indicator rod insertion through hole is provided on the neck of the chin base indicator rod positioning screw. The chin base indicator rod insertion through hole is directly opposite to the longitudinal adjustment groove hole. The second positioning nut and the chin base indicator rod locking screw are... The positioning screw is connected by a stud thread. The head of the positioning screw and the second positioning nut are respectively tightly abutted against the outer circumferential surface of the longitudinal adjustment slide column. The head and neck of the positioning screw are also provided with a positioning threaded hole for the chin indicator rod. The positioning threaded hole for the chin indicator rod is perpendicularly and cross-connected with the insertion hole for the chin indicator rod. The locking screw for the chin indicator rod is threadedly connected to the positioning threaded hole for the chin indicator rod, and the stud end of the locking screw for the chin indicator rod is tightly abutted against the outer circumferential surface of the chin indicator rod in the insertion hole for the chin indicator rod.

[0018] As a further improvement of the present invention, the longitudinal positioning slide hole on the side wall of the longitudinal adjustment slide column is a countersunk through hole structure. The heads of the longitudinal positioning screw and the chin bottom indicator rod positioning screw are respectively formed into elongated block structures. The heads of the longitudinal positioning screw and the chin bottom indicator rod positioning screw are respectively stopped in the circumferential direction and can be slidably accommodated in the countersunk structure of the longitudinal positioning slide hole. The ends of the first positioning nut and the second positioning nut facing away from the longitudinal adjustment slide column are respectively formed into knob operating parts with outward expansion. The knob operating parts of the first positioning nut and the second positioning nut are stopped outside the longitudinal adjustment slide column.

[0019] As a further improvement of the present invention, the lower end of the longitudinal adjustment slide column is movably threaded with a jaw frame alignment adjustment screw, the head of the lower end of the jaw frame alignment adjustment screw can be supported on a table, and a locking nut is also threadedly connected to the jaw frame alignment adjustment screw, the locking nut can be tightly abutted against the lower end surface of the longitudinal adjustment slide column.

[0020] As a further improvement of the present invention, the lateral adjustment positioning component is an adjustment knob with a stud, the upper end of the longitudinal adjustment slide column forms a flat head structure that matches the lateral adjustment slide, the flat head structure is stopped in the circumferential direction and can be horizontally slidably inserted into the lateral adjustment slide along the extension direction of the lateral adjustment slide, the stud of the adjustment knob is threadedly connected to the upper end of the flat head structure, and the lateral positioning slide block is tightly clamped between the upper end face of the longitudinal adjustment slide column and the lower end face of the adjustment knob.

[0021] As a further improvement of the present invention, the transverse positioning slide block is further fixedly installed with leveling bubbles at both ends of the transverse adjusting slide length direction.

[0022] As a further improvement of the present invention, the structure of the jaw fork fixedly installed on the other end of the directional adjustment slide bar is as follows: a U-shaped opening slot is formed on the end face of the other end of the directional adjustment slide bar, a U-shaped connecting piece is formed at the tail of the jaw fork, the U-shaped connecting piece at the tail of the jaw fork is inserted into the U-shaped opening slot on the other end of the directional adjustment slide bar, and coaxially facing connecting through holes and connecting threaded holes are respectively provided on the side walls on both sides of the U-shaped opening slot on the outer circumference of the other end of the directional adjustment slide bar. The connecting through holes and connecting threaded holes are perpendicularly intersecting and communicating with the U-shaped opening slot. A connecting through hole is provided on the U-shaped connecting piece at the tail of the jaw fork, and the connecting through hole can communicate directly with the connecting through hole and the connecting threaded hole. A jaw fork positioning screw is also provided. The jaw fork positioning screw passes through the connecting through hole and the connecting through hole in sequence and is finally threadedly connected to the connecting threaded hole. The head of the jaw fork positioning screw is stopped on the outer surface of the other end of the directional adjustment slide bar.

[0023] The beneficial effects of this invention are as follows: The jaw fork of this invention can be precisely adjusted in the lateral, longitudinal, anterior-posterior, and lateral directions, and in the pitch direction. All adjustment directions have digital scale indicators, enabling dentists to obtain accurate digital coordinates of the patient's jaw plane position using this device. These digital coordinates themselves have clinical significance and can be recorded in the patient's medical record. The dentist only needs to tell the dental technician the digital coordinates of the jaw fork position and send the jaw bracket with the jaw fork to the dental technician by express delivery. The dentist does not need to send the jaw fork fixation device to the dental technician, avoiding the situation where the jaw fork fixation device is relatively displaced during transportation, which would cause the dentist's work to be wasted. This effectively improves the accuracy and efficiency of complete denture fabrication. Attached Figure Description

[0024] Figure 1 This is an exploded perspective view of the present invention;

[0025] Figure 2 This is a perspective view of the present invention;

[0026] Figure 3 This is the front view of the present invention;

[0027] Figure 4 This is a first exploded perspective view of the structural principle of the present invention;

[0028] Figure 5 This is a second exploded perspective view of the structural principle of the present invention;

[0029] Figure 6 This is a third exploded perspective view of the structural principle of the present invention;

[0030] Figure 7 This is a fourth exploded perspective view of the structural principle of the present invention;

[0031] Figure 8 This is a front view illustrating the structural principle of the present invention;

[0032] Figure 9 This is a first perspective view of the invention in use.

[0033] Figure 10 This is a second perspective view of the invention in use;

[0034] Figure 11 This is a third perspective view of the invention in use;

[0035] Figure 12 This is a main view showing the usage state of the present invention;

[0036] Figure 13 Left view of the invention in use;

[0037] Figure 14 Right view of the invention in use;

[0038] Figure 15 This is a schematic diagram illustrating the usage state of the present invention;

[0039] Figure 16 This is a first perspective view of the pitch angle scale cover of the present invention;

[0040] Figure 17 This is a second perspective view of the pitch angle scale cover of the present invention;

[0041] Figure 18 This is a front view of the pitch angle scale cover of the present invention;

[0042] Figure 19 This is a top view of the pitch angle scale cover of the present invention;

[0043] Figure 20 This is a perspective view of the jaw fork of the present invention;

[0044] Figure 21 This is a front view of the jaw fork of the present invention;

[0045] Figure 22This is a perspective view of the directional adjustment slide bar of the present invention;

[0046] Figure 23 This is a front view of the directional adjustment slide bar of the present invention;

[0047] Figure 24 This is a top view of the directional adjustment slide bar of the present invention;

[0048] Figure 25 This is a perspective view of the longitudinal adjustment groove column of the present invention;

[0049] Figure 26 This is a front view of the longitudinal adjustment groove column of the present invention;

[0050] Figure 27 This is a right view of the longitudinal adjustment groove column of the present invention;

[0051] Figure 28 This is a perspective view of the vector position indicator slide sleeve of the present invention;

[0052] Figure 29 This is a perspective view of the longitudinal positioning screw of the present invention;

[0053] Figure 30 This is a perspective view of the positioning screw for the chin indicator rod of the present invention. Detailed Implementation

[0054] Example: A jaw fork adjustment mechanism for multi-dimensional precise positioning of a complete denture facebow, comprising a longitudinal adjustment slide post 1, a transverse positioning slide block 2, a directional adjustment slide rod 3, a pitch angle scale cover 4, a jaw fork 5, a facebow positioning connector 10, a transverse adjustment positioning component, and a directional adjustment positioning component. The transverse positioning slide block 2 can be fixedly installed on the facebow's crossbeam 6 via the facebow positioning connector 10. The transverse positioning slide block 2 has an elongated transverse adjustment slide 21 parallel to the facebow's crossbeam 6. The upper end of the longitudinal adjustment slide post 1 can be slidably inserted into the transverse adjustment slide 21 along the extension direction of the transverse adjustment slide 21. The transverse adjustment positioning component can fix the longitudinal adjustment slide post 1 to the transverse positioning slide block 2 at any transverse position.

[0055] The longitudinal adjustment slide column 1 is provided with a long strip-shaped longitudinal adjustment slide hole 11 extending longitudinally. One end of the directional adjustment slide rod 3 is inserted into the longitudinal adjustment slide hole 11. The directional adjustment slide rod 3 can slide along its own length direction and longitudinally within the longitudinal adjustment slide hole 11. The directional adjustment slide rod 3 can also swing up and down longitudinally within the longitudinal adjustment slide hole 11 to change its angle with the horizontal plane. The directional adjustment positioning component can be slidably installed on the side wall of the directional adjustment slide rod 3 along the length direction of the directional adjustment slide rod 3. The directional adjustment positioning component can fix one end of the directional adjustment slide rod 3 at any position and swing angle with the longitudinal adjustment slide column 1. The pitch angle scale cover 4 is fixedly installed on the directional adjustment positioning component, and the pitch angle scale cover 4 is directly opposite the swing center of one end of the directional adjustment slide rod 3.

[0056] The lateral positioning slide block 2 has a lateral scale 22 arranged along the extension direction of the lateral adjusting slide 21 on its side wall; the longitudinal adjusting slide column 1 has a longitudinal scale 12 arranged along the extension direction of the longitudinal adjusting slide hole 11 on its side wall; the axial adjusting slide rod 3 has an axial scale 31 arranged along the length direction of the axial adjusting slide rod 3 on its side wall; the pitch angle scale cover 4 has a pitch angle scale 41 arranged around the swing center of the axial adjusting slide rod 3; the longitudinal adjusting slide column 1... The upper side wall is provided with a horizontal indicator 13 that can be aligned with the scale on the horizontal scale 22. The pitch angle scale cover 4 or the directional adjustment positioning component is provided with a longitudinal indicator 42 that can be aligned with the scale on the longitudinal scale 12. The pitch angle scale cover 4, the directional adjustment positioning component, or the longitudinal adjustment slide column 1 is also provided with a directional indicator that can be aligned with the scale on the directional scale 31. The directional adjustment slide rod 3 is provided with a pitch angle indicator 71 that can be aligned with the pitch angle scale 41.

[0057] The jaw fork 5 is fixedly installed on the other end of the directional adjustment slide bar 3.

[0058] The lateral adjustment slide block is fixed to the face bow beam by two face bow beam fixing screws. The lateral adjustment slide block has a lateral adjustment groove 21 in the middle of its length direction. The upper end of the longitudinal adjustment slide column 1 can be inserted into the lateral adjustment groove 21. The longitudinal adjustment slide column 1 is laterally slid to change the lateral position of the jaw fork 5. The lateral scale 22 on the lateral adjustment slide block has a scale with a middle reading of 0, which can read the precise lateral position value of the jaw fork 5.

[0059] The outer circumferential surface of the longitudinal adjustment slide post 1 is provided with a longitudinal scale 12, which has numerical graduations indicating the distance. This distance represents the distance of the sagittal adjustment slide post 3 from the plane where the facebone is positioned (in complete denture restoration, this is the nasal-auricular plane). If the sagittal adjustment slide post 3 is adjusted to be parallel to the facebone at this point, this value is the distance from the nasal-auricular plane to the occlusal plane of the complete denture.

[0060] The surface of the pitch angle scale cover 4 is provided with a pitch angle scale 41. The pitch angle scale 41 has graduations indicating angles. By reading the angle value, the precise pitch angle of the directional adjustment slide bar 3 can be determined (i.e., the angle between the occlusal surface of the complete denture represented by the jaw fork 5 and the nasolabial plane (the plane represented by the facebone)). When the directional adjustment slide bar 3 is parallel to the facebone, it is at 0 degrees, which is the midpoint of the graduations on the pitch angle scale 41.

[0061] The endpoint of the etched line in the middle of the tail of the jaw fork 5 is the alignment point at the front of the maxillary ridge, which is the location of the mesial connection point of the maxillary central incisors in the future complete denture. The directional scale 31 on the directional adjustment slide bar 3 is used to indicate the distance, which is the distance from this point to the ear canal of the facebone in the plane of the facebone body.

[0062] In use, the facebow is inserted into the patient's external auditory canal via the facebow's ear hole shaft 61 to help position the facebow on the patient's head. After precise adjustments in the horizontal, vertical, anteroposterior, and pitch directions, the dentist obtains the digital coordinates of the patient's jaw plane position by reading the values ​​of the horizontal scale 22 corresponding to the horizontal indicator 13, the vertical scale 12 corresponding to the vertical indicator 42, the sagittal scale 31 corresponding to the sagittal indicator, and the pitch angle scale 41 corresponding to the pitch angle indicator 71. These digital coordinates are clinically significant and can be recorded in the patient's medical record. The dentist only needs to provide the dental technician with the digital coordinates of the jaw fork 5 position and send the jaw support with the jaw fork 5 to the dental technician by express delivery. The dentist does not need to send the jaw fork 5 fixation device to the dental technician, avoiding the situation where the jaw fork 5 fixation device may shift during transportation, resulting in wasted work for the dentist, thus improving the accuracy and convenience of complete denture fabrication.

[0063] The directional adjustment positioning component includes a longitudinal positioning screw 33 and a first positioning nut 34. The side wall of the longitudinal adjustment slide column 1 is provided with a long strip-shaped longitudinal positioning slide hole 14 extending longitudinally, and the depth direction of the longitudinal positioning slide hole 14 is perpendicular to the depth direction of the longitudinal adjustment slide hole 11. The directional adjustment slide rod 3 is provided with a long strip-shaped directional adjustment slide hole 38 extending along its length direction. The longitudinal positioning screw 33 can be slidably inserted into the longitudinal positioning slide hole 14 and the directional adjustment slide hole 38 respectively. The longitudinal positioning screw 33 is threadedly connected to the first positioning nut 34. The head of the longitudinal positioning screw 33 stops on the outer side wall of the longitudinal adjustment slide column 1. The first positioning nut 34 and the inner side wall of the longitudinal adjustment slide hole 11 can be tightly clamped on the two opposite sides of the directional adjustment slide rod 3. The pitch angle scale cover 4 is fixedly installed on the head of the longitudinal positioning screw 33.

[0064] The longitudinal adjustment slide bar 1 can be cylindrical, square, or other cylindrical structures. Longitudinal adjustment slide bar holes 11 and longitudinal positioning slide bar holes 14 are respectively formed at 90-degree intervals along its outer circumference. The longitudinal adjustment slide bar holes 11 are precisely for inserting the directional adjustment slide bar rod 3, and the longitudinal positioning slide bar holes 14 are precisely for inserting the longitudinal positioning screw 33. This design allows the directional adjustment slide bar rod 3, after being inserted into the longitudinal adjustment slide bar hole 11 of the longitudinal adjustment slide bar 1, to be fixed to the longitudinal adjustment slide bar 1 by a longitudinal positioning screw 33 and a first positioning nut 34. The first positioning nut 34 allows the jaw fork 5 to move and be positioned in the directional (forward / backward), longitudinal (upward / downward), and pitch directions.

[0065] The head of the longitudinal positioning screw 33 is provided with a threaded hole concentric with its stud, and the pitch angle scale cover 4 is locked to the head of the longitudinal positioning screw 33 by the positioning screw.

[0066] The pitch angle scale cover 4 forms a convex arc surface concentric with the longitudinal positioning screw 33 on one side wall facing the jaw fork 5. The pitch angle scale 41 is formed on the surface of the convex arc surface. The directional adjustment slide rail 3 is slidably fitted with a directional indicator slide sleeve 7 along its length direction. The directional indicator slide sleeve 7 is circumferentially stopped and positioned with the directional adjustment slide rail 3. The end face of the directional indicator slide sleeve 7 facing away from the jaw fork 5 forms a concave arc surface. The concave arc surface can slide along the convex arc surface on the pitch angle scale cover 4 with the axis of the longitudinal positioning screw 33 as the center. The pitch angle indicator 71 is located on the side wall of the directional indicator slide sleeve 7.

[0067] The sagittal position indicator sleeve 7 is a hollow sleeve that slides onto the sagittal adjustment slide bar 3. The side of the sagittal position indicator sleeve 7 facing the jaw fork 5 is a straight surface, and the other side is a concave arc surface. There is a graduated line in the middle of the side wall of the sagittal position indicator sleeve 7; this graduated line is the pitch angle indicator mark 71. The graduated line in the middle of the sagittal position indicator sleeve 7 points to the angle value on the pitch angle scale cover 4, indicating the reading of the pitch angle of the sagittal adjustment slide bar 3. The sagittal adjustment slide bar 3 has numerical graduations indicating distance. The reading on the straight side of the sagittal position indicator sleeve 7 at this graduation position is the distance from the mesial contact point of the maxillary central incisor of the jaw fork 5 to the patient's ear canal in the plane of the face arch.

[0068] The convex surface of the pitch angle scale cover 4 is ideally a conical arc surface, which perfectly fits the concave arc surface of the sagittal position indicator sleeve 7, which is slidable on the sagittal position adjustment slide rod 3. The pitch angle of the sagittal position adjustment slide rod 3 can be read by correspondingly indicating the pitch angle on the pitch angle indicator 71 on the sagittal position indicator sleeve 7 with the pitch angle scale 41. (Because the jaw fork 5 is fixed on the sagittal position adjustment slide rod 3, this pitch angle is the angle of the jaw fork 5; because the jaw fork 5 is fixed on the patient's jaw ridge plane, this pitch angle is the angle of the occlusal surface of the complete denture subsequently fabricated for the patient.)

[0069] The opposite side of the arc edge of the pitch angle dial is best designed as a straight surface, and a scale line is designed in the center of it as a longitudinal indicator 42. The longitudinal indicator 42 points exactly on the scale of the longitudinal scale 12 of the longitudinal adjustment slide column 1, so that the position value of the directional adjustment slide rod 3 at this node can be read.

[0070] It also includes a chin base indicator rod 8 and a chin base indicator positioning component. One end of the chin base indicator rod 8 can be slidably inserted into the longitudinal adjustment slide hole 11, and the other end of the chin base indicator rod 8 can be directly aligned with the chin base of the human body. The chin base indicator positioning component can fix one end of the chin base indicator rod 8 and the longitudinal adjustment slide column 1 at any longitudinal position. The chin base indicator rod 8 or the chin base indicator positioning component is also provided with a chin base indicator mark 81 that can be directly aligned with the scale on the longitudinal scale 12.

[0071] A chin-base indicator assembly, consisting of a chin-base indicator rod 8 and a chin-base indicator positioning element, is used to measure the vertical distance from the base of the patient's nose to the base of the chin.

[0072] The chin base indicator positioning component includes a chin base indicator rod positioning screw 82, a second positioning nut 83, and a chin base indicator rod locking screw 84. The head of the chin base indicator rod positioning screw 82 has a neck formed between it and the stud. The neck of the chin base indicator rod positioning screw 82 is circumferentially stopped and slidably inserted into the longitudinal positioning slide hole 14. A chin base indicator rod insertion through hole 821 is provided on the neck of the chin base indicator rod positioning screw 82, which is directly opposite to the longitudinal adjustment slide hole 11. The second positioning nut 83 is positioned opposite to the chin base indicator rod positioning screw 82. The stud is threaded, and the head of the chin indicator rod positioning screw 82 and the second positioning nut 83 are respectively tightly abutted against the outer circumferential surface of the longitudinal adjustment slide column 1. The head and neck of the chin indicator rod positioning screw 82 are also provided with a chin indicator rod positioning threaded hole. The chin indicator rod positioning threaded hole is perpendicularly and cross-connected with the chin indicator rod insertion through hole 821. The chin indicator rod locking screw 84 is threadedly connected in the chin indicator rod positioning threaded hole, and the stud end of the chin indicator rod locking screw 84 is tightly abutted against the outer circumferential surface of the chin indicator rod 8 in the chin indicator rod insertion through hole 821.

[0073] The chin indicator rod 8 can pass through the chin indicator rod insertion hole 821 on the step of the neck of the chin indicator rod positioning screw 82. The head end face of the chin indicator rod positioning screw 82 has a positioning threaded hole for the chin indicator rod 8, which communicates with the chin indicator rod insertion hole 821. The chin indicator rod locking screw 84 is screwed in by hand until it is fully tightened, which can position the chin indicator rod 8 in the sagittal direction (i.e., the front-to-back direction). The neck of the chin indicator rod positioning screw 82 has a waist-shaped feature, which, like the aforementioned longitudinal positioning screw 33, can slide up and down in the longitudinal adjustment slide hole 11 of the longitudinal adjustment slide column 1. The longitudinal height of the chin indicator rod 8 is positioned by hand-tightening the chin indicator rod positioning screw 82.

[0074] The longitudinal positioning slide hole 14 on the side wall of the longitudinal adjustment slide column 1 is a countersunk through hole structure. The heads of the longitudinal positioning screw 33 and the chin bottom indicator rod positioning screw 82 are respectively formed into long strip block structures. The heads of the longitudinal positioning screw 33 and the chin bottom indicator rod positioning screw 82 are respectively stopped in the circumferential direction and can be slidably accommodated in the countersunk structure of the longitudinal positioning slide hole 14. The ends of the first positioning nut 34 and the second positioning nut 83 facing away from the longitudinal adjustment slide column 1 are respectively formed into knob operating parts with outward expansion. The knob operating parts of the first positioning nut 34 and the second positioning nut 83 are stopped outside the longitudinal adjustment slide column 1.

[0075] The longitudinal adjustment groove hole 11 of the longitudinal adjustment groove column 1 is machined with a wider straight groove to form a countersunk head structure, which can be inserted into the head (waist-shaped screw head) of the long strip block structure of the longitudinal positioning screw 33, so that the longitudinal positioning screw 33 can only move up and down in the countersunk head structure.

[0076] The pitch angle scale cover 4 is preferably formed at the bottom with a long strip groove feature that is consistent with the head of the long strip block structure of the longitudinal positioning screw 33, which is inserted into the head of the longitudinal positioning screw 33 to ensure that the pitch angle scale cover 4 and the longitudinal positioning screw 33 are stably positioned.

[0077] The lower end of the longitudinal adjustment slide column 1 is movably threaded with a jaw frame alignment adjustment screw 15. The head of the lower end of the jaw frame alignment adjustment screw 15 can be supported on the table. The jaw frame alignment adjustment screw 15 is also threaded with a locking nut 16, which can be tightly abutted against the lower end surface of the longitudinal adjustment slide column 1.

[0078] After the jaw alignment adjustment screw 15 is screwed into the locking nut 16, it is then screwed into the screw hole on the bottom surface of the longitudinal adjustment slide column 1, and locked in place by the locking nut 16. Because in the workshop, the entire face bow with jaw fork 5 needs to be installed on the jaw frame for work, and the jaw alignment adjustment screw 15 can be used to adjust the face bow body to be parallel to the table.

[0079] The lateral adjustment positioning component is an adjustment knob 23 with a stud. The upper end of the longitudinal adjustment slide column 1 forms a flat head structure that matches the lateral adjustment slide 21. The flat head structure is circumferentially stopped and can be horizontally slidably inserted into the lateral adjustment slide 21 along the extension direction of the lateral adjustment slide 21. The stud of the adjustment knob 23 is threadedly connected to the upper end of the flat head structure. The lateral positioning slide block 2 is tightly clamped between the upper end face of the longitudinal adjustment slide column 1 and the lower end face of the adjustment knob 23. The lateral adjustment slide block is connected to the longitudinal adjustment screw groove via an adjustment knob 23 with a stud. The longitudinal adjustment screw groove is fixedly positioned by the close contact between the adjustment knob 23 with the lateral adjustment slide block. When the adjustment knob 23 with the stud is released, the longitudinal adjustment screw groove can be slid left and right to adjust the lateral distance. The upper end of the longitudinal adjustment slide groove 1 is a flat head structure with a waist-shaped protrusion, which can be inserted into the lateral adjustment slide groove 21 of the lateral adjustment slide block and slide laterally.

[0080] The transverse positioning slide block 2 is located at both ends of the transverse adjustment slide 21 along its length, and leveling bubbles 24 are fixedly installed thereon. The upper surface of the transverse adjustment slide block has blind holes at both ends, where two leveling bubbles 24 are installed to ensure that the face arch mounted on the patient's head is parallel to the ground plane.

[0081] The jaw fork 5 is fixedly installed on the other end of the directional adjustment slide bar 3 as follows: a U-shaped opening slot 35 is formed on the end face of the other end of the directional adjustment slide bar 3; a U-shaped connecting piece 51 is formed at the tail of the jaw fork 5; the U-shaped connecting piece 51 at the tail of the jaw fork 5 is inserted into the U-shaped opening slot 35 on the other end of the directional adjustment slide bar 3; and coaxially aligned connecting through holes 36 and connecting threaded holes 37 are respectively provided on the side walls on both sides of the U-shaped opening slot 35 on the outer circumference of the other end of the directional adjustment slide bar 3. The connecting through hole 36 and the connecting threaded hole 37 are perpendicularly intersecting and communicating with the U-shaped opening slot. The U-shaped connecting piece 51 at the tail of the jaw fork 5 is provided with a connecting through hole 52. The connecting through hole 52 can communicate directly with the connecting through hole 36 and the connecting threaded hole 37. A jaw fork positioning screw 9 is also provided. The jaw fork positioning screw 9 passes through the connecting through hole 36 and the connecting through hole 52 in sequence and is finally threadedly connected to the connecting threaded hole 37. The head of the jaw fork positioning screw 9 is stopped on the outer surface of the other end of the directional adjustment slide bar 3.

[0082] The U-shaped connecting piece 51 at the tail of the jaw fork 5 is inserted into the flat groove-shaped U-shaped opening slot 35 at the other end of the directional adjustment slide bar 3. The notch of the U-shaped connecting piece 51 at the tail of the jaw fork 5 serves as a lateral limiting function. The jaw fork 5 is fixed in place by a jaw fork positioning screw 9.

[0083] The other end of the directional adjustment slide bar 3 is preferably formed by a flesh-reducing structure to create a plane for the head of the jaw fork positioning screw 9 to contact, ensuring that the head of the jaw fork positioning screw 9 is in close contact with the outer surface of the other end of the directional adjustment slide bar 3 for positioning, and ensuring that the tail of the jaw fork 5 is firmly and stably connected. The tail of the jaw fork 5 is provided with a U-shaped connecting piece 51 and a connecting hole 52 on it for connecting with the head of the directional adjustment slide bar 3.

Claims

1. A jaw fork adjustment mechanism for multi-dimensional precise positioning of the facebone of a complete denture, characterized in that: The system includes a longitudinal adjustment slide bar (1), a transverse positioning slide bar (2), a directional adjustment slide bar (3), a pitch angle scale cover (4), a jaw fork (5), a face bow positioning connector, a transverse adjustment positioning component, and a directional adjustment positioning component. The transverse positioning slide bar can be fixedly installed on the face bow's crossbeam (6) via the face bow positioning connector (10). The transverse positioning slide bar has a long strip-shaped transverse adjustment slide bar (21) parallel to the face bow's crossbeam. The upper end of the longitudinal adjustment slide bar can be slidably inserted into the transverse adjustment slide bar along the extension direction of the transverse adjustment slide bar. The transverse adjustment positioning component can fix the longitudinal adjustment slide bar to the transverse positioning slide bar at any transverse position. The longitudinal adjustment slide column is provided with a long strip-shaped longitudinal adjustment slide hole (11) extending longitudinally. One end of the directional adjustment slide rod is inserted into the longitudinal adjustment slide hole. The directional adjustment slide rod can slide along its own length direction and longitudinally within the longitudinal adjustment slide hole. The directional adjustment slide rod can also swing up and down longitudinally within the longitudinal adjustment slide hole to change its angle with the horizontal plane. The directional adjustment positioning component can be slidably installed on the side wall of the directional adjustment slide rod along the length direction of the directional adjustment slide rod. The directional adjustment positioning component can fix one end of the directional adjustment slide rod at any position and swing angle with the longitudinal adjustment slide column. The pitch angle scale cover is fixedly installed on the directional adjustment positioning component, and the pitch angle scale cover is directly opposite the swing center of one end of the directional adjustment slide rod. The transverse positioning slide block has a transverse scale (22) arranged along the extension direction of the transverse adjustment slide block on its side wall, and a longitudinal scale (12) arranged along the extension direction of the longitudinal adjustment slide hole on its side wall. The axial adjustment slide rod has a axial scale (31) arranged along the length direction of the axial adjustment slide rod on its side wall. The pitch angle scale cover has a pitch angle scale (41) arranged around the swing center of the axial adjustment slide rod. The longitudinal adjustment slide... The upper side wall of the groove column is provided with a horizontal indicator (13) that can be aligned with the scale on the horizontal scale. The pitch angle scale cover or the directional adjustment positioning component is provided with a longitudinal indicator (42) that can be aligned with the scale on the longitudinal scale. The pitch angle scale cover, the directional adjustment positioning component, or the longitudinal adjustment slide column is also provided with a directional indicator that can be aligned with the scale on the directional scale. The directional adjustment slide rod is provided with a pitch angle indicator (71) that can be aligned with the pitch angle scale. The jaw fork is fixedly installed on the other end of the directional adjustment slide bar; It is also provided with a chin bottom indicator rod (8) and a chin bottom indicator positioning component. One end of the chin bottom indicator rod can be slidably inserted into the longitudinal adjustment slide hole, and the other end of the chin bottom indicator rod can be directly aligned with the chin bottom position of the human body. The chin bottom indicator positioning component can fix one end of the chin bottom indicator rod and the longitudinal adjustment slide column at any longitudinal position. The chin bottom indicator rod or the chin bottom indicator positioning component is also provided with a chin bottom indicator mark (81) that can be directly aligned with the scale on the longitudinal scale. The chin indicator positioning component includes a chin indicator rod positioning screw (82), a second positioning nut (83), and a chin indicator rod locking screw (84). The head of the chin indicator rod positioning screw has a neck between it and the stud. The neck of the chin indicator rod positioning screw is circumferentially stopped and slidably inserted into a longitudinal positioning groove hole. A chin indicator rod insertion through hole (821) is provided on the neck of the chin indicator rod positioning screw. The chin indicator rod insertion through hole is directly opposite the longitudinal adjustment groove hole. The second positioning nut and the chin indicator rod locking screw... The chin indicator rod positioning screw has a stud threaded connection. The head of the chin indicator rod positioning screw and the second positioning nut are respectively tightly abutted against the outer circumferential surface of the longitudinal adjustment slide column. The head and neck of the chin indicator rod positioning screw are also provided with a chin indicator rod positioning threaded hole. The chin indicator rod positioning threaded hole is perpendicularly and cross-connected with the chin indicator rod insertion through hole. The chin indicator rod locking screw is threadedly connected in the chin indicator rod positioning threaded hole, and the stud end of the chin indicator rod locking screw is tightly abutted against the outer circumferential surface of the chin indicator rod in the chin indicator rod insertion through hole.

2. The jaw fork adjustment mechanism for multidimensional precise positioning of the complete denture facebone according to claim 1, characterized in that: The directional adjustment positioning component includes a longitudinal positioning screw (33) and a first positioning nut (34). The longitudinal adjustment slide column sidewall is provided with a long strip-shaped longitudinal positioning slide hole (14) extending longitudinally, and the depth direction of the longitudinal positioning slide hole is perpendicular to the depth direction of the longitudinal adjustment slide hole. The directional adjustment slide rod is provided with a long strip-shaped directional adjustment slide hole (38) extending along its length direction. The longitudinal positioning screw can be slidably inserted into the longitudinal positioning slide hole and the directional adjustment slide hole respectively. The longitudinal positioning screw is threadedly connected to the first positioning nut. The head of the longitudinal positioning screw is stopped on the outer sidewall of the longitudinal adjustment slide column. The first positioning nut and the inner sidewall of the longitudinal adjustment slide hole can be tightly clamped on the two opposite sides of the directional adjustment slide rod. The pitch angle scale cover is fixedly installed on the head of the longitudinal positioning screw.

3. The jaw fork adjustment mechanism for multi-dimensional precise positioning of the facebow of a complete denture according to claim 1, characterized in that: The pitch angle scale cover forms a convex arc surface concentric with the longitudinal positioning screw on one side wall facing the jaw fork. The pitch angle scale is formed on the surface of the convex arc surface. A directional adjustment slide rod is slidably fitted with a directional indicator slide sleeve (7) along its length direction. The directional indicator slide sleeve and the directional adjustment slide rod are stopped and positioned in the circumferential direction. The directional indicator slide sleeve forms a concave arc surface on one end face facing away from the jaw fork. The concave arc surface can slide along the convex arc surface on the pitch angle scale cover with the longitudinal positioning screw axis as the center. The pitch angle indicator is located on the side wall of the directional indicator slide sleeve.

4. The jaw fork adjustment mechanism for multidimensional precise positioning of the facebone of a complete denture according to claim 2, characterized in that: The longitudinal positioning groove hole on the side wall of the longitudinal adjustment groove column is a countersunk through hole structure. The heads of the longitudinal positioning screw and the chin indicator rod positioning screw are respectively formed into elongated block structures. The heads of the longitudinal positioning screw and the chin indicator rod positioning screw are respectively stopped in the circumferential direction and can be slidably accommodated in the countersunk structure of the longitudinal positioning groove hole. The ends of the first positioning nut and the second positioning nut facing away from the longitudinal adjustment groove column are respectively formed into knob operating parts with outward expansion. The knob operating parts of the first positioning nut and the second positioning nut are stopped outside the longitudinal adjustment groove column.

5. The jaw fork adjustment mechanism for multidimensional precise positioning of the facebone of a complete denture according to claim 1, characterized in that: The lower end of the longitudinal adjustment slide column is connected to a jaw frame alignment adjustment screw (15) with a movable thread. The head of the lower end of the jaw frame alignment adjustment screw can be supported on the table. The jaw frame alignment adjustment screw is also connected to a locking nut (16) with a thread. The locking nut can be tightly pressed against the lower end surface of the longitudinal adjustment slide column.

6. The jaw fork adjustment mechanism for multidimensional precise positioning of the facebone of a complete denture according to claim 1, characterized in that: The lateral adjustment positioning component is an adjustment knob (23) with a stud. The upper end of the longitudinal adjustment slide column forms a flat head structure that matches the lateral adjustment slide. The flat head structure is circumferentially stopped and can be horizontally slidably inserted into the lateral adjustment slide along the extension direction of the lateral adjustment slide. The stud of the adjustment knob is threadedly connected to the upper end of the flat head structure. The lateral positioning slide block is tightly clamped between the upper end face of the longitudinal adjustment slide column and the lower end face of the adjustment knob.

7. The jaw fork adjustment mechanism for multidimensional precise positioning of the facebow of a complete denture according to claim 1, characterized in that: The transverse positioning slide block is located at both ends of the transverse adjustment slide length direction and is also fixedly installed with level bubble (24).

8. The jaw fork adjustment mechanism for multidimensional precise positioning of the complete denture facebow according to claim 1, characterized in that: The structure of the jaw fork fixedly installed on the other end of the directional adjustment slide bar is as follows: a U-shaped opening slot (35) is formed on the end face of the other end of the directional adjustment slide bar, a U-shaped connecting piece (51) is formed at the tail of the jaw fork, the U-shaped connecting piece at the tail of the jaw fork is inserted into the U-shaped opening slot at the other end of the directional adjustment slide bar, and coaxially facing connecting through holes (36) and connecting threaded holes (37) are respectively provided on the side walls on both sides of the U-shaped opening slot on the outer circumference of the other end of the directional adjustment slide bar. The connecting through holes and connecting threaded holes are perpendicularly intersecting and communicating with the U-shaped opening slot. A connecting through hole (52) is provided on the U-shaped connecting piece at the tail of the jaw fork. The connecting through hole can communicate with the connecting through hole and the connecting threaded hole. A jaw fork positioning screw (9) is also provided. The jaw fork positioning screw passes through the connecting through hole and the connecting through hole in sequence and is finally threadedly connected to the connecting threaded hole. The head of the jaw fork positioning screw is stopped on the outer surface of the other end of the directional adjustment slide bar.

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