Multifunctional scanning rod for temporary denture

Abstract

The application discloses a multifunctional scanning rod for temporary dentures and relates to the technical field of oral implantation and repair. The scanning rod comprises a shell, an expansion sleeve, an inner screw, a threaded sleeve and a reference rod. An assembly hole is arranged in the shell and penetrates in the axial direction, a fixed part of the expansion sleeve is fixed in the assembly hole, and an expansion part is surrounded by a plurality of elastic expansion plates and is gathered to the axial line in a natural state. The inner screw has an outer threaded section and a distraction section, the threaded sleeve is internally provided with a first reverse conical insertion hole and a second insertion hole with an inner thread, and the outer periphery of the threaded sleeve is provided with a first outer thread and a second outer thread with different pitches. The outer threaded section of the inner screw is connected with the second insertion hole, and the distraction section is located in the expansion part. The rod part of the reference rod is threadedly connected with an inner mounting hole of the inner screw. When the reference rod is rotated, the distraction section radially expands the expansion plates. The scanning rod has adjustable locking force, high connection rigidity and can significantly improve the reliability of in-mouth scanning data.

Description

Technical Field

[0001] This application relates to the field of oral implant restoration technology, and in particular to a multifunctional scanning bar for temporary dentures. Background Technology

[0002] In dental implant restoration, the temporary prosthesis scanning bar is a key component for accurately transferring the three-dimensional position and axis of the implant to the digital model. The rigidity of the connection between the bar and the implant substitute or healing abutment directly determines the reliability of the scanning data. Current scanning bars generally use a direct threaded locking method, where the locking force relies entirely on the instantaneous establishment of the screw-in torque. Once installed, it cannot be readjusted postoperatively based on actual bone conditions or model material properties. When dealing with osteoporotic areas or models with low elastic modulus, the thread preload alone is insufficient to maintain zero displacement at the connection interface under intraoral dynamic loads, temperature changes, and probe contact. Even micron-level relative sliding can generate cumulative errors, leading to digital impression distortion. Excessive torque applied to achieve higher locking force can easily cause plastic deformation of the interface threads or localized stress concentration, which in turn damages the flatness of the positioning reference surface and exacerbates axial deviation. This fixed and non-adjustable locking mechanism has become the core bottleneck restricting the repeatability and stability of the scanning rod. Therefore, there is an urgent need for a scanning rod structure that can provide steplessly adjustable radial locking force, maintain rigidity throughout the scanning process, and adapt to different connection substrates. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that the existing temporary denture scanning rod adopts a direct threaded locking method, the locking force cannot be infinitely adjusted, it is difficult to adapt to different bone or model material properties, and under intraoral dynamic load and scanning probe touch, micro-movement of the connection interface is easily generated, resulting in digital impression distortion; moreover, it lacks a reliable anti-loosening mechanism, has low repeatability accuracy, and cannot meet the requirements of high-precision implant restoration scanning.

[0004] The specific technical solution of this invention is as follows: a multifunctional scanning rod for temporary dentures, comprising: a shell having an axially penetrating mounting hole; an expansion sleeve including a fixing part fixed to the mounting hole and an expansion part extending out of the shell, the expansion part being formed into a tube by multiple elastic expansion plates, the expansion plates converging towards the axis in a natural state; an inner screw having an inner mounting hole with an internal thread on the hole wall and an external thread section on the circumferential surface, the inner screw having a spreading section with an outer diameter larger than the inner diameter of the expansion part in a natural state; a threaded sleeve having a coaxial inverted conical first insertion hole and a second insertion hole with an internal thread, the diameter of the second insertion hole being smaller than the minimum diameter of the first insertion hole, and a first external thread and a second external thread with different pitches on the outer circumferential surface; the external thread section of the inner screw being connected to the internal thread of the second insertion hole, the spreading section being located inside the expansion part, the expansion plate being in a radially expanded state and its outer surface being in contact with the inner wall of the first insertion hole; and a reference rod having an external thread on the rod part and being connected to the internal thread of the inner mounting hole.

[0005] The aforementioned temporary denture multifunctional scanning bar includes an outer shell comprising an annular portion and a constraint portion integrally formed with the annular portion. The axial projection of the constraint portion is hexagonal, and the mounting hole coaxially penetrates the annular portion and the constraint portion.

[0006] The aforementioned temporary denture multifunctional scanning bar has an expansion plate that is an arc-shaped long strip. In its natural state, each expansion plate converges toward its own axis to reduce the outer diameter of the expansion part.

[0007] In the aforementioned temporary denture multifunctional scanning rod, the outer diameter of the nut portion of the internal screw is larger than the inner diameter of the expansion sleeve in its natural state, and the nut portion is located within the mounting hole.

[0008] The aforementioned temporary denture multifunctional scanning rod has a first threaded portion that is inverted conical in shape, and a first insertion hole that is also inverted conical in shape and is located within the first threaded portion; the second threaded portion is cylindrical in shape, and a second insertion hole that is located within the second threaded portion.

[0009] The aforementioned temporary denture multifunctional scanning rod further includes a head connected to the rod portion, the head having a groove to form a U-shaped structure.

[0010] The aforementioned temporary denture multifunctional scanning bar also includes a transverse shaft and an external screw. The radial section of the transverse shaft is U-shaped and matches the groove. The transverse shaft is installed in the groove. The inner wall of the groove is provided with internal threads. The external screw is screwed into the groove and presses the transverse shaft.

[0011] The aforementioned multifunctional scanning rod for temporary dentures has a locking groove on the outer surface of its head, and the scanning rod also includes a locking ring, which is fitted inside the locking groove.

[0012] In the aforementioned temporary denture multifunctional scanning bar, the direction of the external thread of the bar is the same as the direction of the external thread of the internal screw.

[0013] In the aforementioned temporary denture multifunctional scanning rod, the fixing part of the expansion sleeve and the inner wall of the mounting hole are fixedly connected in a way that prevents relative rotation.

[0014] The beneficial effects of this invention are: 1. The expansion sleeve is opened by the internal screw and the expansion part is wedged into the inverted conical first insertion hole to achieve stepless adjustment of the radial locking force. The operator can accurately control the locking torque according to the characteristics of bone or model material to avoid overload damage or insufficient locking. The connection interface is kept at zero displacement throughout the scanning process.

[0015] 2. The threaded sleeve uses a first external thread and a second external thread with different pitches. After being screwed into the interface, differential axial interference is generated, forming a reliable anti-loosening effect, effectively resisting the loosening caused by dynamic load inside the port and vibration caused by the scanning probe.

[0016] 3. The fixing part of the expansion sleeve and the assembly hole must not rotate relative to each other, ensuring that the expansion plate only expands radially and does not slide circumferentially. All locking force is used to wedge the contact surface, resulting in strong connection rigidity and high repeatability positioning accuracy.

[0017] 4. The reference rod head is equipped with a U-shaped groove, a transverse axis and a locking ring. The transverse axis provides clear and easily identifiable lateral optical features, which significantly improves the stitching accuracy of multiple implant scan data. The locking ring constrains the deformation of the groove and forms a smooth protective edge to avoid damage to intraoral tissues.

[0018] 5. The expansion plate can be elastically retracted by rotating the reference rod in the opposite direction. After the outer shell and expansion sleeve are pulled out, the threaded sleeve can be unscrewed separately. No special tools are required for disassembly. All parts can be reused and the operation is convenient. Attached Figure Description

[0019] Figure 1 This is an isometric view of this embodiment; Figure 2 This is a cross-sectional view of this embodiment; Figure 3 This is a perspective view of the outer shell and the expansion sleeve in this embodiment; Figure 4 This is a perspective view of the outer shell and expansion sleeve from another angle in this embodiment; Figure 5 This is a perspective view of the reference rod and the internal screw in this embodiment; Figure 6 This is a perspective view of the threaded sleeve in this embodiment; Figure 7 This is a perspective view of the reference rod, outer screw, and locking ring in this embodiment; Figure 8 This is a perspective view of the reference rod and locking ring in this embodiment.

[0020] Explanation of reference numerals in the attached drawings: 1. Outer shell; 11. Annular part; 12. Constraint part; 13. Assembly hole; 2. Expansion sleeve; 21. Expansion plate; 22. Expansion part; 23. Fixing part; 3. Internal screw; 31. Internal mounting hole; 4. Threaded sleeve; 41. First threaded part; 411. First insertion hole; 42. Second threaded part; 421. Second insertion hole; 5. Reference rod; 51. Rod part; 52. Head; 521. Mounting groove; 522. Transverse shaft; 523. Locking groove; 6. External screw; 7. Locking ring. Detailed Implementation

[0021] In the description of this invention, it should be understood that the terms center, longitudinal, transverse, length, width, thickness, front, back, left, right, upper, lower, axial, radial, vertical, horizontal, inner, and outer, indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Furthermore, the terms first and second are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as first or second may explicitly or implicitly include one or more of that feature. In the description of this invention, "multiple" means two or more, unless otherwise explicitly specified.

[0022] This solution provides a multi-functional scanning arm for temporary dentures, as shown in the reference... Figure 1 and Figure 2 Through the coordinated operation of the outer shell 1, expansion sleeve 2, inner screw 3, threaded sleeve 4, reference rod 5, transverse shaft 522, outer screw 6 and locking ring 7, a highly stable, adjustable locking and precise optical reference are achieved.

[0023] The outer casing 1 includes an annular portion 11 and a constraint portion 12 integrally formed with the annular portion 11. When the implant platform is flat, the annular portion 11 conforms to the jawbone or implant platform, providing stable axial support and precise height reference for the entire scanning rod, ensuring that the rod axis coincides with the implant axis and preventing sinking or swaying. The constraint portion 12 has a hexagonal axial projection. This hexagonal structure is used to cooperate with a wrench or positioning clamp to prevent the scanning rod from rotating during locking operations and intraoral scanning, thereby ensuring accurate repeatability. The constraint portion 12 is coaxially arranged with the annular portion 11. A through hole is provided inside the outer casing 1, forming a mounting hole 13. The mounting hole 13 coaxially passes through the annular portion 11 and the constraint portion 12, providing accommodating space and a guide channel for internal connecting components, ensuring the centered movement of each component.

[0024] Reference Figure 2-4An expansion sleeve 2 is provided inside the assembly hole 13. The expansion sleeve 2 is used to generate radial expansion during locking, firmly connecting the outer shell 1 to the threaded sleeve 4 on the toothed surface. One end of the expansion sleeve 2 is fixedly installed inside the assembly hole 13, ensuring its overall positional stability and preventing axial movement due to locking force. The other end of the expansion sleeve 2 extends outward from the outer shell 1, serving as a deformable section responsible for inserting into the mating hole of the threaded sleeve 4 and expanding and locking under external force. The portion of the expansion sleeve 2 located inside the assembly hole 13 constitutes the fixing part 23, and the portion extending outward from the assembly hole 13 constitutes the expansion part 22. The expansion sleeve 2 includes multiple expansion plates 21, each of which is an arc-shaped elongated plate. Multiple expansion plates 21 together form a tubular structure with a through hole in the middle. The expansion plates 21 are made of elastic material and naturally converge towards their own axis, reducing the outer diameter of the expansion part 22 to facilitate smooth insertion into the first insertion hole 411 of the threaded sleeve 4. When an object is inserted into the expansion sleeve 2, multiple expansion plates 21 are radially expanded, thereby generating strong radial pressure and achieving interference locking with the inner wall of the threaded sleeve 4.

[0025] An internal screw 3 is also provided inside the assembly hole 13, serving as an actuator to drive the deformation of the expansion sleeve 2. The nut portion of the internal screw 3 has a hole with internal threads; this hole is named the internal mounting hole 31. The internal mounting hole 31 is used to connect the reference rod 5 and transmit rotational and axial forces. The internal screw 3 is located both inside the assembly hole 13 and inside the expansion sleeve 2; specifically, the hole in the tubular structure formed by the expansion sleeve 2 is an extension channel of the assembly hole 13. One end of the internal screw 3 is placed inside the assembly hole 13, and the other end extends to the outside of the expansion sleeve 2. During the screwing into the threaded sleeve 4, the extended end drives the entire internal screw 3 to be axially fed towards the threaded sleeve 4, thereby forcibly opening the multiple expansion plates 21 within the expansion sleeve 2, pushing the expansion sleeve 2 to expand. The area with external threads on the body of the internal screw 3 is named the external thread section, and the portion of the internal screw 3 that enters the expansion sleeve 2 and opens the expansion plates 21 is named the opening section.

[0026] Reference Figure 2 and Figure 6The device also includes a threaded sleeve 4, which is used to detachably fix the entire scanning rod to the implant replacement or healing abutment interface on the dental arch. The threaded sleeve 4 includes an integrally formed first threaded portion 41 and a second threaded portion 42. The first threaded portion 41 is shaped like an inverted cone and has a first insertion hole 411 inside, which is used to insert the expansion portion 22 of the expansion sleeve 2. The inverted cone-shaped inner hole mates with the expansion portion 22. When the expansion portion 22 expands radially and weds into the inner hole, it can convert the radial expansion force into an increased pull-out force, making the connection more stable. The second threaded portion 42 is cylindrical and has a through hole inside to form a second insertion hole 421. The diameter of the second insertion hole 421 is smaller than the minimum diameter of the first insertion hole 411, and the second insertion hole 421 has an internal thread for threaded connection with the internal screw 3. The rotational motion is converted into the axial feed of the internal screw 3 through the thread pair. Both the first threaded portion 41 and the second threaded portion 42 have external threads for connection with the jaw. The external threads on the first threaded portion 41 and the second threaded portion 42 have different pitches. The external thread on the first threaded portion 41 is named the first external thread, and the external thread on the second threaded portion 42 is named the second external thread. This differential thread design, when the interface internal thread is compatible with both thread sections, will cause axial interference due to the difference in lead, thus providing an anti-loosening effect. It can also adapt to interfaces of different depths, improving versatility.

[0027] Reference Figure 2 and Figure 5 It also includes a reference rod 5, which is used to establish an optical reference coordinate system for intraoral scanning. The reference rod 5 includes a rod portion 51 and a head 52. The rod portion 51 has an external screw 6 structure, that is, it is machined with external threads, for threaded connection with the internal mounting hole 31 of the internal screw 3, so that the reference rod 5 and the internal locking system form a rigid series body, ensuring that the reference rod 5 reflects the true internal connection state.

[0028] During assembly and locking, the rod portion 51 of the reference rod 5 is first screwed into the inner mounting hole 31 to achieve threaded fastening. Then, axial pressure is applied to press down the reference rod 5, causing the inner screw 3 to press down towards the jawbone. At this time, since the first threaded portion 41 and the second threaded portion 42 of the threaded sleeve 4 are already threadedly connected to the jawbone and remain circumferentially and axially fixed, the pressing action of the inner screw 3 directly pushes its body into the expansion portion 22 of the expansion sleeve 2, causing the multiple expansion plates 21 to be opened. The expansion portion 22 expands radially and tightly abuts against the inverted conical inner wall of the first insertion hole 411. This operation causes the expansion sleeve 2 to be tightly wedged into the inverted conical first insertion hole 411, forming an immediate radial lock and rigidly fixing the outer shell 1 to the jawbone. The threads in the inner mounting hole 31 and the second insertion hole 421 have the same direction of rotation. Therefore, when the reference rod 5 is rotated subsequently, while the rod portion 51 continues to be screwed into the inner mounting hole 31, the inner screw 3 is also simultaneously screwed into the second insertion hole 421. As the screw 3 is screwed in to a greater depth, the expansion sleeve 2 is stretched to a greater extent. The interference fit and contact force between the expansion sleeve 2 and the first insertion hole 411 are thus enhanced, thereby providing a steplessly adjustable locking force that can adapt to the connection requirements of different bone or model materials and ensure zero displacement of the connection interface during scanning.

[0029] Reference Figure 7 and Figure 8 The reference rod 5 has a groove 52 at its head, forming a U-shaped structure. This groove is named the mounting groove 521, and it has an internal thread. The U-shaped mounting groove 521 is used to accommodate and clamp the transverse shaft 522, providing a clear lateral feature reference for scanning. A crossbar is provided within the mounting groove 521 as the transverse shaft 522, and the radial section of the transverse shaft 522 is U-shaped, matching the shape of the mounting groove 521. After the transverse shaft 522 and the reference rod 5 are assembled, they form a clear beam structure. This beam structure serves as a feature point that is easily identifiable by the scanner, helping to determine the horizontal plane, occlusal plane, or implant axis, significantly improving the stitching accuracy of multiple implant scanning data. An external screw 6 is also included, which is threadedly connected to the mounting groove 521. After the transverse shaft 522 is installed in the mounting groove 521, tightening the external screw 6 presses the transverse shaft 522 into the mounting groove 521, locking the circumferential and axial positions of the transverse shaft 522. The outer surface of the head 52 is provided with a locking groove 523. It also includes a locking ring 7, which is installed within the locking groove 523. As the outer screw 6 is tightened, the U-shaped mounting groove 521 tends to expand outwards. At this time, the locking ring 7 restricts the expansion range of the mounting groove 521 from the outer periphery, thereby reducing stress concentration and protecting the structure of the head 52. Simultaneously, the outer edge of the locking ring 7 forms a smooth anti-collision stop, preventing the reference rod 5 head 52 from accidentally contacting the intraoral tissue during scanning and causing damage.

[0030] The implementation process of this application is as follows: The core of the temporary denture multifunctional scanning rod provided in this application lies in the linkage of the outer shell 1, expansion sleeve 2, internal screw 3, threaded sleeve 4, and reference rod 5 to achieve stepless adjustable radial locking and maintain zero displacement of the connection interface throughout the scanning process. In specific implementation, the threaded sleeve 4 is first screwed into the interface of the intraoral implant substitute or healing abutment. The pitch of the first external thread and the second external thread of the threaded sleeve 4 are different. When the interface internal thread is engaged with both threads, axial interference will occur during the screwing process, forming a differential anti-loosening effect to prevent accidental loosening caused by subsequent operations or intraoral vibration. At this time, the first insertion hole 411 (inverted conical) of the threaded sleeve 4 faces outward, providing a tapered mating surface for the wedging of the expansion sleeve 2.

[0031] Next, the outer shell 1, together with the expansion sleeve 2 fixed in its mounting hole 13, is fitted onto the outside of the threaded sleeve 4. The fixing part 23 of the expansion sleeve 2 cannot rotate relative to the inner wall of the mounting hole 13 (such as key connection or polygonal fit). The expansion part 22 is formed into a tube by multiple elastic expansion plates 21. In its natural state, each expansion plate 21 converges towards the axis, and its outer diameter is smaller than the minimum hole diameter of the first insertion hole 411. Therefore, the expansion part 22 can be inserted into the first insertion hole 411 without interference. At the same time, the annular part 11 of the outer shell 1 fits against the surface of the substitute platform or jawbone, and the restraint part 12 (hexagonal in axial projection) faces outward to prevent rotation when using a wrench later.

[0032] Then, insert the inner screw 3 from above the mounting hole 13 of the outer casing 1, so that its extended section is located inside the expansion portion 22 of the expansion sleeve 2, and the nut portion is located inside the mounting hole 13; then screw the external thread of the rod portion 51 of the reference rod 5 into the inner mounting hole 31 of the inner screw 3, and initially tighten it until the rod end contacts the bottom of the hole. The external thread of the inner screw 3 and the internal thread of the second insertion hole 421 of the threaded sleeve 4 are in the same direction of rotation, and the external thread of the rod portion 51 of the reference rod 5 and the internal thread of the inner mounting hole 31 are also in the same direction of rotation, and the two thread pairs have the same direction of rotation. At this time, use a wrench to hold the hexagonal constraint portion 12 of the outer casing 1 to prevent the outer casing 1 from rotating, and use a special tool (such as a hex wrench) to rotate the head 52 of the reference rod 5.

[0033] During the tightening process, the rod portion 51 of the reference rod 5 is further screwed into the inner mounting hole 31. Simultaneously, due to the same thread direction and the threaded connection between the inner screw 3 and the second insertion hole 421, the inner screw 3 as a whole is axially fed relative to the threaded sleeve 4, and its spreading section gradually penetrates into the expansion portion 22. Since the outer diameter of the spreading section is larger than the inner diameter of the expansion portion 22 in its natural state, the expansion plate 21 is forced to expand radially, and the outer wall of the expansion portion 22 fits tightly against the inverted conical inner wall of the first insertion hole 411. As the screwing depth increases, the contact pressure increases linearly, forming an interference wedging between the expansion sleeve 2 and the threaded sleeve 4. The radial locking force is continuously adjustable—the operator can control the screwing torque according to the actual bone condition or model material characteristics: appropriately reduce the torque when the bone is osteoporotic or the model is soft to avoid damaging the interface; moderately increase the torque when higher rigidity is required until the scanning rod has no axial movement or radial wobble. The entire process achieves stepless adjustment of the locking force, avoiding excessive torque that could cause plastic deformation, and ensuring zero displacement of the connection interface throughout the scanning process.

[0034] The fixing part 23 of the expansion sleeve 2 cannot rotate relative to the mounting hole 13, ensuring that the expansion sleeve 2 will not rotate with the inner screw 3 during the tightening process, and all deformation is radial expansion, with the locking force acting entirely on the wedge contact surface.

[0035] The reference rod 5 has a U-shaped groove at its head 52, with internal threads on the inner wall of the groove. During installation, the transverse shaft 522 (with a U-shaped radial cross-section) is placed into the groove, and the external screw 6 is screwed in to tighten and secure it. During the tightening process, the sidewalls of the U-shaped groove tend to expand outwards. At this time, the locking ring 7 is fitted into the locking groove 523 on the outer surface of the head 52, restraining the deformation of the sidewalls from the outer periphery and preventing stress concentration. Simultaneously, the outer edge of the locking ring 7 forms a smooth protective edge, preventing the head 52 from contacting intraoral tissue and causing damage during scanning. After installation, the transverse shaft 522 forms a clear lateral feature, which the intraoral scanner can use to identify the horizontal reference plane and the implant axis, significantly improving the stitching accuracy of multiple implant scan data.

[0036] During the scanning operation, the scanner scans the head 52 of the reference rod 5, the transverse axis 522, and the annular portion 11 of the outer casing 1 to acquire the three-dimensional position and axial data of the implant. Since the radial locking force provided by the expansion sleeve 2 has been precisely set and kept constant according to the actual conditions before scanning, there is no micro-movement at the connection interface, and the data is accurate and reliable.

[0037] After scanning is complete, the reference rod 5 is rotated in the opposite direction, causing the spreading section of the inner screw 3 to exit from the expansion part 22. The expansion plate 21 returns to its closed state due to its own elasticity, and the outer diameter of the expansion part 22 decreases, making it easy to pull the outer shell 1 along with the expansion sleeve 2 out of the threaded sleeve 4. Finally, the threaded sleeve 4 is unscrewed to complete the disassembly. The entire operation does not require special disassembly tools, and each component can be reused.

[0038] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A multifunctional scanning bar for temporary dentures, characterized in that, include: The outer casing (1) has an axially through mounting hole (13); The expansion sleeve (2) includes a fixing part (23) fixed to the assembly hole (13) and an expansion part (22) extending out of the outer shell (1). The expansion part (22) is formed into a tube by multiple elastic expansion plates (21). In its natural state, the expansion plates (21) converge toward the axis. The inner screw (3) has an inner mounting hole (31) in the nut part with an internal thread on the hole wall and an external thread section on the circumferential surface. The inner screw (3) has a spreading section and its outer diameter is larger than the inner diameter of the naturally expanding part (22). The threaded sleeve (4) has a coaxial inverted conical first insertion hole (411) and a second insertion hole (421) with internal thread inside. The diameter of the second insertion hole (421) is smaller than the minimum diameter of the first insertion hole (411). The outer circumferential surface is provided with a first external thread and a second external thread with different pitches. The external thread section of the internal screw (3) is connected to the internal thread of the second insertion hole (421), the expansion section is located inside the expansion part (22), the expansion plate (21) is in a radially expanded state and its outer surface is in contact with the inner wall of the first insertion hole (411); The reference rod (5) has an external thread on its rod part (51) and is connected to the internal thread of the inner mounting hole (31).

2. The multifunctional scanning bar for temporary dentures according to claim 1, characterized in that, The outer casing (1) includes an annular portion (11) and a constraint portion (12) integrally formed with the annular portion (11). The axial projection of the constraint portion (12) is hexagonal. The mounting hole (13) coaxially passes through the annular portion (11) and the constraint portion (12).

3. The multifunctional scanning bar for temporary dentures according to claim 1, characterized in that, The expansion plate (21) is an arc-shaped long strip. In its natural state, each expansion plate (21) converges toward its own axis to reduce the outer diameter of the expansion part (22).

4. The multifunctional scanning bar for temporary dentures according to claim 1, characterized in that, The outer diameter of the nut portion of the inner screw (3) is larger than the inner diameter of the expansion sleeve (2) in its natural state, and the nut portion is located inside the assembly hole (13).

5. A multifunctional scanning bar for temporary dentures according to claim 1, characterized in that, The first threaded portion (41) of the threaded sleeve (4) is inverted conical, and the first insertion hole (411) is opened in the first threaded portion (41) and is inverted conical; the second threaded portion (42) is cylindrical, and the second insertion hole (421) is opened in the second threaded portion (42).

6. A multifunctional scanning bar for temporary dentures according to claim 1, characterized in that, The reference rod (5) also includes a head (52) connected to the rod portion (51), and the head (52) has a groove to form a U-shaped structure.

7. A multifunctional scanning bar for temporary dentures according to claim 6, characterized in that, It also includes a transverse shaft (522) and an external screw (6). The radial section of the transverse shaft (522) is U-shaped and matches the groove. The transverse shaft (522) is installed in the groove. The inner wall of the groove is provided with an internal thread. The external screw (6) is screwed into the groove and presses the transverse shaft (522).

8. A multifunctional scanning bar for temporary dentures according to claim 7, characterized in that, The outer surface of the head (52) is provided with a locking groove (523), and the scanning rod also includes a locking ring (7), which is sleeved in the locking groove (523).

9. A multifunctional scanning bar for temporary dentures according to claim 1, characterized in that, The direction of the external thread of the rod (51) is the same as the direction of the external thread of the internal screw (3).

10. A multifunctional scanning bar for temporary dentures according to claim 1, characterized in that, The fixing part (23) of the expansion sleeve (2) and the inner wall of the assembly hole (13) are fixedly connected in a way that prevents relative rotation.

Images