Bone expansion device for preventing buccal inclination of molars

Abstract

The utility model relates to a bony arch expander for preventing molar buccal inclination in the field of arch expanders, which comprises a central spiral device and more than two band rings, the band rings are respectively mounted on the left side and the right side of the central spiral device through two groups of adjusting rotating shafts, and each adjusting rotating shaft comprises a first rotating shaft seat, a second rotating shaft seat and a connecting rod. The first rotating shaft seats are located at the two ends of the central spiral device, the second rotating shaft seats are located at the ends, close to the central spiral device, of the belt rings, the two ends of the connecting rods are rotationally connected with the first rotating shaft seats and the second rotating shaft seats correspondingly, and the connecting rods can turn over relative to the central spiral device with the first rotating shaft seats as the axis. The belt ring can turn over relative to the connecting rod with the second rotating shaft seat as the axis, the double-shaft hinged structure effectively disperses an expansion force conduction path, the buccal tilting moment acting on the molar is remarkably reduced, unexpected buccal displacement caused by rigid connection of a traditional device is avoided, and the positive axis position of the tooth body in the physiological movement range is kept.

Description

Technical Field

[0001] This utility model relates to the field of arch expanders, and in particular to a bony arch expander for preventing buccal tilting of molars. Background Technology

[0002] In the field of orthodontics, arch expanders are important devices for correcting narrow dental arches and improving tooth alignment. They increase the width of the dental arch by applying a lateral expansion force to the jawbone, causing the palatal suture to widen. In skeletal arch expansion treatments for adolescents and dental arch expansion treatments for adults, this device is used to correct maxillary arch expansion to alleviate malocclusions such as crowding, protrusion, and reverse bite caused by insufficient development or narrowness of the maxilla.

[0003] Existing expanders mainly consist of a central spiral mechanism and two side rings. The central spiral mechanism generates lateral expansion force through a central screw mechanism, and the rings are fixed to both sides of the central spiral mechanism via rigid connecting rods. The rings are fixed to the molar crowns by bonding or welding, and the connecting rods and the central spiral mechanism are connected in a non-rotatable rigid manner. When the central spiral mechanism expands in width, the expansion force is directly transmitted to the rings through the connecting rods, forming a horizontal thrust on the molar.

[0004] Because the connecting rod lacks freedom of movement between itself, the central helical device, and the belt loop, the vector resultant force generated during the application of force will act directly on the molar along the axis of the connecting rod, causing the tooth to be forced to buccal tilt, that is, the tooth tilts and moves towards the cheek. Figure 1 As indicated by the arrow in the image. This non-physiological lateral thrust not only disrupts the normal stress distribution of the periodontal ligament, but may also cause complications such as root resorption and abnormal alveolar bone remodeling, seriously affecting the effectiveness and long-term stability of arch expansion treatment, and causing the user to develop "buck teeth". Utility Model Content

[0005] In order to overcome the shortcomings of existing technical solutions, this utility model provides a skeletal expander to prevent molars from tilting to the cheek, which can effectively solve the technical problem that the band can easily push the molars to tilt to the cheek.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] A skeletal expander for preventing buccal tilting of molars includes a central spiral device and belt loops. Two or more belt loops are provided, each mounted on the left and right sides of the central spiral device via two sets of adjusting shafts. Each adjusting shaft includes a first shaft seat, a second shaft seat, and a connecting rod. The first shaft seat is located at both ends of the central spiral device, and the second shaft seat is located at the ends of the two belt loops closest to the central spiral device. The two ends of the connecting rod are rotatably connected to the first and second shaft seats, respectively. The connecting rod can rotate relative to the central spiral device about the first shaft seat as its axis, and the belt loops can rotate relative to the connecting rod about the second shaft seat as its axis.

[0008] Furthermore, the central spiral device includes a connecting block and an adjusting screw. There are two connecting blocks that are symmetrical to each other. The two ends of the adjusting screw are respectively connected to the two connecting blocks, and two first rotating shaft seats are respectively disposed on the surfaces of the two connecting blocks.

[0009] Furthermore, a guide rod is connected between the two connecting blocks, and guide holes are provided in the two connecting blocks. The two ends of the guide rod pass through the two guide holes respectively, and the guide rod is set parallel to the adjusting screw.

[0010] Furthermore, an adjusting sleeve is provided in the middle of the adjusting screw. The adjusting sleeve is located between the two connecting blocks. A cross-shaped through hole is provided inside the adjusting sleeve. The axis of the through hole is arranged radially along the adjusting sleeve and extends to the surface of the adjusting sleeve.

[0011] Furthermore, the edge of the central spiral device is provided with bone screws for connecting to the jawbone.

[0012] Furthermore, the surface of the belt ring is provided with a connecting ring for mounting a dental clamp.

[0013] Compared with existing technologies, the beneficial effects of this invention are: the dual-axis hinge structure effectively disperses the transmission path of expansion force; through the composite rotating pair formed by the first and second rotating shaft seats, the originally single lateral thrust is transformed into multi-angle spatial components, significantly reducing the buccal tilting moment acting on the molar. The optimized mechanical transmission path allows the band to primarily function as a retention device rather than a force-applying carrier; the molar only bears the necessary vertical indentation force during expansion, avoiding unintended buccal displacement caused by rigid connections in traditional devices, and maintaining the tooth's axial position within its physiological range of motion. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the usage status of existing technologies;

[0015] Appendix Figure 1 The labels in the text are: 1-Central spiral device, 2-Ring, 3-Connecting rod, 4-Molar, 5-Jawbone.

[0016] Figure 2 This is a schematic diagram of the structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the usage state of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the adjusting shaft in this utility model;

[0019] Appendix Figure 2 and attached Figure 3The labels in the diagram are: 1-Central spiral device, 101-Connecting block, 102-Adjusting screw, 103-Guide rod, 104-Adjusting sleeve, 105-Through hole, 2-Ring, 3-Adjusting shaft, 301-First shaft seat, 302-Second shaft seat, 303-Connecting rod, 4-Bone screw, 5-Molar, 6-Jawbone. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] The following is combined Figure 2 and Figure 3 A detailed description of this utility model is provided below:

[0022] A skeletal expander for preventing buccal tilting of molars includes a central spiral device 1 and six belt rings 2. The six belt rings 2 are respectively mounted on the left and right sides of the central spiral device 1 via two sets of adjusting shafts 3. The adjusting shafts 3 include a first shaft seat 301, a second shaft seat 302, and a connecting rod 303. The first shaft seat 301 is located at both ends of the central spiral device 1, and the second shaft seat 302 is located at the ends of the two belt rings 2 near the central spiral device 1. The two ends of the connecting rod 303 are rotatably connected to the first shaft seat 301 and the second shaft seat 302, respectively. The connecting rod 303 can rotate relative to the central spiral device 1 with the first shaft seat 301 as the axis, and the belt rings 2 can rotate relative to the connecting rod 303 with the second shaft seat 302 as the axis.

[0023] The dual-axis hinge structure effectively disperses the expansion force transmission path. Through the composite rotational pair formed by the first pivot seat 301 and the second pivot seat 302, the originally singular lateral thrust is transformed into a combination of component forces in multi-dimensional space, significantly reducing the buccal tilting moment acting on the molar 5. The optimized mechanical transmission path allows the band 2 to primarily function as a retention device rather than a force-applying carrier. During expansion, the molar 5 only bears the necessary vertical indentation force, avoiding unintended buccal displacement caused by rigid connections in traditional devices, and maintaining the tooth's axial position within its physiological range of motion.

[0024] The central spiral device 1 includes connecting blocks 101 and adjusting screws 102. Two symmetrical connecting blocks 101 are provided. The two ends of the adjusting screw 102 are connected to the two connecting blocks 101 respectively. Two first rotating shaft seats 301 are respectively disposed on the surfaces of the two connecting blocks 101. Rotating the adjusting screw 102 changes the distance between the connecting blocks 101. The amount of screw advance of the adjusting screw 102 is precisely converted into the horizontal displacement of the connecting blocks 101, achieving quantitative adjustment of the bilateral symmetrical expansion force, ensuring precise control of the expansion amount, avoiding stress concentration problems caused by unilateral overload, and simplifying the force calibration process in clinical operation. A guide rod 103 is connected between the two connecting blocks 101. Guide holes are provided in the two connecting blocks 101. The two ends of the guide rod 103 pass through the two guide holes respectively. The guide rod 103 is set parallel to the adjusting screw 102. The axial constraint design of the guide rod 103 and the guide hole forms a double guiding mechanism. While the adjusting screw 102 generates the main expansion force, the rotational degree of freedom of the connecting block 101 is restricted by the sliding pair, which effectively eliminates the axial offset of the connecting block 101 during the adjustment process, ensures that the expansion force is strictly transmitted along the horizontal sagittal plane, and significantly improves the stability and directional consistency of the device operation. An adjusting sleeve 104 is provided in the middle of the adjusting screw 102. The adjusting sleeve 104 is located between two connecting blocks 101. A cross-shaped through hole 105 is provided inside the adjusting sleeve 104. The axis of the through hole 105 is arranged radially along the adjusting sleeve 104 and extends to the surface of the adjusting sleeve 104. The cross-shaped through hole 105 structure forms a multi-plane force application interface, allowing clinicians to use standard tools to apply force at multiple angles to rotate the adjusting screw 102.

[0025] The edge of the central spiral device 1 is provided with bone screws 4 for connecting the jawbone 6. The bone screws 4 are configured to directly transmit the mechanical arch expansion force to the base of the jawbone 6, forming a composite anchoring system of bone anchorage and dental anchorage. It is particularly suitable for the jawbone 6 suture and adult patients with closure, and acts on the jawbone 6 through the bone screws 4.

[0026] The surface of the band 2 is provided with a connecting ring, which realizes a modular expansion interface, enabling the expander to form a mechanical linkage with fixed appliances, transpalatal bars, and other auxiliary devices. This achieves coordinated control of expansion treatment and three-dimensional tooth position adjustment, and optimizes the dental arch morphology remodeling path through the combined action of multiple orthodontic devices, making it particularly suitable for severe malocclusion cases requiring multi-stage combined treatment.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A skeletal expander for preventing buccal tilting of molars, comprising a central spiral device and bands, wherein there are two or more bands, characterized in that: The belt rings are respectively installed on the left and right sides of the central spiral device via two sets of adjusting shafts. The adjusting shafts include a first shaft seat, a second shaft seat, and a connecting rod. The first shaft seat is located at both ends of the central spiral device, and the second shaft seat is located at one end of the belt rings on both sides near the central spiral device. The two ends of the connecting rod are rotatably connected to the first shaft seat and the second shaft seat, respectively. The connecting rod can rotate relative to the central spiral device with the first shaft seat as the axis, and the belt rings can rotate relative to the connecting rod with the second shaft seat as the axis.

2. The skeletal expander for preventing buccal tilting of molars according to claim 1, characterized in that: The central spiral device includes a connecting block and an adjusting screw. There are two connecting blocks that are symmetrical to each other. The two ends of the adjusting screw are connected to the two connecting blocks respectively. Two first rotating shaft seats are respectively disposed on the surfaces of the two connecting blocks.

3. The skeletal expander for preventing buccal tilting of molars according to claim 2, characterized in that: A guide rod is connected between the two connecting blocks. Guide holes are provided in the two connecting blocks. The two ends of the guide rod pass through the two guide holes respectively. The guide rod is set parallel to the adjusting screw.

4. A skeletal expander for preventing buccal tilting of molars according to claim 2, characterized in that: An adjusting sleeve is provided in the middle of the adjusting screw. The adjusting sleeve is located between the two connecting blocks. A cross-shaped through hole is provided inside the adjusting sleeve. The axis of the through hole is arranged radially along the adjusting sleeve and extends to the surface of the adjusting sleeve.

5. A bony expander for preventing buccal tilting of molars according to any one of claims 1-4, characterized in that: The edge of the central spiral device is provided with bone screws for connecting to the jawbone.

6. A bony expander for preventing buccal tilting of molars according to any one of claims 1-4, characterized in that: The surface of the belt ring is provided with a connecting ring for installing a dental clamp.

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