Maxillary alveolar bone segment traction device

Abstract

The utility model provides a maxillary alveolar bone segment traction device, which is characterized in that two opposite sides on an alveolar fracture are respectively a first side and a second side, and a dental bone corresponding to the first side is provided with an operation osteotomy line which is arranged at an interval with the first side; the maxillary alveolar bone segment traction device forms an osteotomy portion between the surgical osteotomy line and the first side by osteotomy along the surgical osteotomy line, the maxillary alveolar bone segment traction device includes two positioning cast crowns and a movable cast crown. According to the maxillary alveolar bone segment traction device, the positioning cast crowns are arranged on the molars on the two sides respectively, stable supporting is provided for the outer traction assembly and the inner traction assembly through the positioning cast crowns, and further, the outer traction assembly and the inner traction assembly can be matched with the elastic piece to provide arc-shaped guiding matched with a dental arch curve for the movable cast crowns; in addition, by arranging the traction assemblies on the inner side and the outer side of the dental arch, a good traction effect can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of craniofacial correction technology, and in particular to a maxillary alveolar bone segment traction device. Background Technology

[0002] Congenital cleft lip and palate is the most common craniofacial developmental malformation. Patients with complete cleft lip and palate usually have alveolar clefts. A considerable number of patients have large alveolar clefts that cannot be filled by alveolar cleft bone grafting. The oral-nasal fistula caused by the large alveolar cleft seriously affects the patient's eating and speech functions. At present, in clinical practice, the alveolar cleft can be reduced and the oral-nasal fistula can be closed by local resection of the maxillary alveolar bone to form a tooth-bone transfer complex. At the same time, the resection area can provide space to align the teeth or perform restoration treatment for missing teeth, thereby establishing good occlusal function. The existing alveolar traction device is mainly placed on the outer side of the dental arch. After surgical resection of the alveolar bone at the position where traction is needed, the traction device is installed.

[0003] The aforementioned prior art has the following drawbacks:

[0004] The anterior segment of the dental arch is arc-shaped, with the alveolar cleft located in the arc-shaped part of the anterior segment. Existing distraction osteogenesis devices are placed on the outside of the dental arch and are linear traction devices, i.e., straight-line traction, which cannot form an arc. This results in poor dental arch morphology after distraction osteogenesis, affecting the establishment of the upper and lower occlusal relationship. At the same time, the three-dimensional control of the transferred bone segment, especially the vertical control, is not ideal. The distraction bone segment is prone to tilting and moving in the traction direction, resulting in poor dental arch morphology after distraction osteogenesis and affecting the establishment of the upper and lower occlusal relationship.

[0005] Therefore, in order to solve the above problems, this utility model proposes a maxillary alveolar bone segment traction device that can provide an arc-shaped guide that matches the dental arch curve and avoids poor dental arch morphology after traction osteogenesis. Utility Model Content

[0006] To address the problems existing in the prior art, this utility model provides a maxillary alveolar bone segment traction device.

[0007] According to one objective of this utility model, this utility model provides a maxillary alveolar bone segment traction device, wherein two opposite sides of the alveolar cleft are respectively a first side and a second side, and a surgical osteotomy line is provided on the dental bone corresponding to the first side, spaced apart from the first side. Osteotomy is performed along the surgical osteotomy line to form an osteotomy portion between the surgical osteotomy line and the first side. The maxillary alveolar bone segment traction device includes:

[0008] Two positioning cast crowns and a movable cast crown, with one positioning cast crown corresponding to each of the two molars, and the movable cast crown corresponding to the teeth in the osteotomy portion;

[0009] An external traction assembly and an internal traction assembly are respectively supported and connected between the two positioning cast crowns. The external traction assembly is arranged on the outside of the dental arch and is configured to provide an arc-shaped guide for the movable cast crown along the length of the alveolar fissure. The internal traction assembly is arranged on the inside of the dental arch and is configured to provide an arc-shaped guide for the movable cast crown along the length of the alveolar fissure. The arc-shaped guide matches the curve of the dental arch.

[0010] An elastic element drives the movable cast crown to move in a manner close to the second side of the alveolar fissure.

[0011] Preferably, the external traction assembly includes:

[0012] The guide rod corresponding to the labial side is connected at both ends to one of the positioning cast crowns, and the guide rod is set along the curve of the dental arch;

[0013] A guide member is mounted on the lip side of the movable cast crown and is configured to move along the length of the guide rod.

[0014] Preferably, the guide is a tubular guide, which is sleeved on the outside of the traction guide rod, and the axial dimension of the guide is much larger than the radial dimension.

[0015] Preferably, the osteotomy portion has a plurality of continuous teeth, each of which is provided with a movable cast crown, and the guide is disposed on the movable cast crown located in the middle;

[0016] The number of guide elements is multiple, and at least two of the movable casting crowns are provided with the guide elements.

[0017] Preferably, the internal traction assembly includes:

[0018] A fixed connecting rod, the two ends of which are respectively connected to one of the positioning cast crowns;

[0019] A movable connecting rod, one end of which is connected to the middle of the fixed connecting rod via a rotating joint, wherein the direction of movement of the rotating joint matches the curve of the dental arch, and the other end of the movable connecting rod is connected to the movable cast crown;

[0020] The elastic element is disposed between the fixed connecting rod and the movable connecting rod along the direction of movement of the rotating pair.

[0021] Preferably, when there are multiple movable casting crowns, the movable connecting rod is connected to the movable casting crown located in the middle.

[0022] Preferably, an elastic element is provided on each of the fixed connecting rods on both sides of the moving direction of the rotary joint.

[0023] Preferably, the length of the movable connecting rod is adjustable.

[0024] Preferably, an auxiliary cast crown is provided on the tooth near the alveolar fissure in the tooth between the osteotomy portion and one of the molars. The internal traction assembly also includes an auxiliary connecting rod, one end of which is connected to the middle of the fixed connecting rod, and the other end of which is connected to the auxiliary cast crown. The elastic element is disposed between the auxiliary connecting rod and the movable connecting rod.

[0025] Preferably, the length of the elastic element is adjustable.

[0026] Compared with the prior art, the beneficial effects of this utility model are:

[0027] This maxillary alveolar bone segment traction device uses positioning cast crowns on both molars to provide stable support for the external and internal traction components. Furthermore, the external and internal traction components, in conjunction with elastic elements, provide an arc-shaped guide for the movable cast crowns that matches the arch curve, preventing poor arch morphology after traction bone formation and affecting the establishment of the upper and lower occlusal relationship. In addition, setting traction components on both the inner and outer sides of the arch can achieve better traction effect.

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the maxillary alveolar bone segment traction device described in this utility model. Detailed Implementation

[0030] The following description is intended to provide a detailed account of the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0031] Please see Figure 1This utility model provides a technical solution: a maxillary alveolar bone segment traction device, wherein the two opposite sides of the alveolar cleft 100 are a first side 100a and a second side 100b, respectively, and a surgical osteotomy line 201 is provided on the dental bone 200 corresponding to the first side 100a, spaced apart from the first side 100a, and an osteotomy portion 202 is formed between the surgical osteotomy line 201 and the first side 100a by osteotomy along the surgical osteotomy line 201. The maxillary alveolar bone segment traction device includes:

[0032] Two positioning cast crowns 300 and a movable cast crown 400 are provided, with each of the two molars 203 corresponding to one of the positioning cast crowns 300, and the movable cast crown 400 corresponding to the teeth of the osteotomy portion 202;

[0033] An external traction assembly 500 and an internal traction assembly 600 are respectively supported and connected between the two positioning cast crowns 300. The external traction assembly 500 is arranged on the outside of the dental arch and is configured to provide an arc-shaped guide for the movable cast crown 400 along the length direction of the alveolar fissure 100. The internal traction assembly 600 is arranged on the inside of the dental arch and is configured to provide an arc-shaped guide for the movable cast crown 400 along the length direction of the alveolar fissure 100. The arc-shaped guide matches the curve of the dental arch.

[0034] An elastic element 700 drives the movable cast crown 400 to move in a manner close to the second side 100b of the alveolar fissure 100.

[0035] By setting positioning cast crowns 300 on both molars 203, the positioning cast crowns 300 provide stable support for the external traction component 500 and the internal traction component 600. Furthermore, the external traction component 500 and the internal traction component 600 can work with the elastic element 700 to provide an arc-shaped guide for the movable cast crown 400 that matches the dental arch curve, thus avoiding poor dental arch morphology after traction bone formation and affecting the establishment of the upper and lower occlusal relationship. In addition, setting traction components on both the inner and outer sides of the dental arch can achieve better traction effect.

[0036] The external traction assembly 500 includes:

[0037] The guide rod 501 corresponding to the labial side is connected at both ends to one of the positioning cast crowns 300. The guide rod 501 is set along the curve of the dental arch. Preferably, the guide rod 501 and the positioning cast crown 300 are fixed by welding.

[0038] Guide 502, which is mounted on the lip side of the movable cast crown 400, is configured to move along the length direction of the guide rod 501.

[0039] Furthermore, the guide member 502 is a tubular guide member, which is sleeved on the outside of the traction guide rod 501. Preferably, the axial dimension of the guide member 502 is much larger than its radial dimension to ensure that the guide member 502 moves stably on the traction guide rod 501 and avoids large-scale deviations in directions other than the length direction of the traction guide rod 501.

[0040] Furthermore, the osteotomy portion 202 has several continuous teeth, each of which is provided with a movable cast crown 400, and the guide 502 is disposed on the movable cast crown 400 located in the middle.

[0041] To improve the guiding effect of the guide member 502 and prevent large deviations of the movable cast crown 400 during the guidance process, the guide member 502 is further provided in multiples, with at least one guide member 502 provided on each of the two movable cast crowns 400. In this embodiment, the osteotomy portion 202 has three consecutive teeth, and each tooth has a movable cast crown 400 on its outer side. The movable cast crown 400 located in the middle and the adjacent movable cast crown 400 are each provided with a guide member 502, so that the guide member 502 can provide support for the osteotomy portion 202 at multiple points in the direction of movement when it moves along the guide rod 501.

[0042] The internal traction assembly 600 includes:

[0043] A fixed connecting rod 601 is provided, and both ends of the fixed connecting rod 601 are respectively connected to one of the positioning casting crowns 300. Preferably, the fixed connecting rod 601 and the positioning casting crown 300 are fixed by welding.

[0044] A movable connecting rod 602 is provided, one end of which is connected to the middle of the fixed connecting rod 601 via a rotating joint 603, wherein the direction of movement of the rotating joint 603 matches the curve of the dental arch, and the other end of the movable connecting rod 602 is connected to the movable cast crown 400. Preferably, when there are multiple movable cast crowns 400, the movable connecting rod 602 is connected to the movable cast crown 400 located in the middle.

[0045] The elastic element 700 is connected to the fixed connecting rod 601 and the movable connecting rod 602 along the moving direction of the rotary joint 603. In use, the movable connecting rod 602 is pulled by the elastic element 700, and the movable connecting rod 602 moves in a fan-shaped trajectory on the fixed connecting rod 601 through the rotary joint 603. The fan-shaped trajectory corresponds to the curve of the dental arch.

[0046] Furthermore, an elastic element 700 is provided on each of the fixed connecting rods 601 on both sides of the moving direction of the rotary joint 603.

[0047] Furthermore, the length dimension of the elastic element 700 is adjustable. Optionally, the elastic element 700 is a bow expander, which is a dental arch expander screw. This is existing technology and well known to those skilled in the art, and will not be described in detail here. Regarding the specific structure between the movable connecting rod 602 and the fixed connecting rod 601, a fixing plate is provided in the middle of the fixed connecting rod 601, and the fixing plate is connected to the movable connecting rod 602 through a bearing.

[0048] Furthermore, the length of the movable connecting rod 602 is adjustable so that when the movable cast crown 400 moves to different arch positions, the length of the movable connecting rod 602 can be adjusted to ensure that the inner traction component 600 and the outer traction component 500 maintain a synchronized movement trajectory. In one embodiment, the movable connecting rod 602 is divided into two segments along its length, and the two segments of the movable connecting rod 602 are connected by an arch expander.

[0049] In the length direction of the dental arch, when the distance between the fixed connecting rod 601 and the movable connecting rod 602 is large, it is difficult to achieve the driving effect of the elastic element 700 on the movable connecting rod 602 when the elastic element 700 is installed between the movable connecting rod 602 and the fixed connecting rod 601. To solve the above problem, further, an auxiliary cast crown 800 is provided on the tooth near the alveolar fissure 100 in the tooth between the osteotomy portion 202 and one of the molars 203. The internal traction assembly 600 also includes an auxiliary connecting rod 604. One end of the auxiliary connecting rod 604 is connected to the middle of the fixed connecting rod 601, and the other end of the auxiliary connecting rod 604 is connected to the auxiliary cast crown 800. The elastic element 700 is disposed between the auxiliary connecting rod 604 and the movable connecting rod 602 to ensure that the elastic element 700 can effectively drive the movable cast crown 400 during use.

[0050] In summary, this maxillary alveolar bone segment traction device has an inner traction component 600 placed inside the dental arch and an outer traction component 500 with a pre-designed moving track on the outside of the dental arch. The traction route is arc-shaped, and the pre-designed track can effectively control the vertical position of the traction osteotomy segment 202, thereby making the dental arch shape formed after traction closer to the normal dental arch shape, which is conducive to the establishment of upper and lower occlusal function. Through effective alveolar bone segment traction, the alveolar cleft 100 in patients with cleft lip and palate can be reduced, thereby enabling alveolar bone grafting surgery and closure of oronasal fistula, which is beneficial to subsequent orthodontic treatment and the establishment of occlusal function.

[0051] The embodiments described above are only used to illustrate the technical ideas and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. The scope of patent application of this utility model should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in this utility model still fall within the patent scope of this utility model.

Claims

1. A maxillary alveolar bone segment traction device, wherein two opposite sides of an alveolar cleft (100) are a first side (100a) and a second side (100b), and surgical osteotomy lines (201) are provided on the dental bone (200) corresponding to the first side (100a) at intervals from the first side (100a), and osteotomy portions (202) are formed between the surgical osteotomy lines (201) and the first side (100a) by osteotomy along the surgical osteotomy lines (201), characterized in that, The maxillary alveolar bone segment traction device includes: Two positioning cast crowns (300) and a movable cast crown (400) are provided, with one positioning cast crown (300) corresponding to each of the two molars (203), and the movable cast crown (400) corresponding to the teeth of the osteotomy portion (202); An external traction assembly (500) and an internal traction assembly (600) are respectively supported and connected between the two positioning cast crowns (300). The external traction assembly (500) is arranged on the outside of the dental arch and is configured to provide an arcuate guide for the movable cast crown (400) along the length direction of the alveolar fissure (100). The internal traction assembly (600) is arranged on the inside of the dental arch and is configured to provide an arcuate guide for the movable cast crown (400) along the length direction of the alveolar fissure (100). The arcuate guide matches the curve of the dental arch. An elastic element (700) drives the movable cast crown (400) to move in a manner close to the second side (100b) of the alveolar fissure (100).

2. The maxillary alveolar bone segment traction device according to claim 1, characterized in that, The external traction assembly (500) includes: The guide rod (501) corresponding to the labial side is connected at both ends to one of the positioning cast crowns (300), and the guide rod (501) is set along the curve of the dental arch; A guide (502) is mounted on the lip side of the movable cast crown (400) and is configured to move along the length of the guide rod (501).

3. The maxillary alveolar bone segment traction device according to claim 2, characterized in that, The guide (502) is a tubular guide and is sleeved on the outside of the guide rod (501). The axial dimension of the guide (502) is much larger than its radial dimension.

4. A maxillary alveolar bone segment traction device according to claim 2, characterized in that, The osteotomy portion (202) has several continuous teeth, each of which is provided with a movable cast crown (400), and the guide (502) is provided on the movable cast crown (400) located in the middle; The number of guide members (502) is multiple, and at least two of the movable casting crowns (400) are provided with the guide members (502).

5. A maxillary alveolar bone segment traction device according to claim 1, characterized in that, The internal traction assembly (600) includes: A fixed connecting rod (601) is provided, and both ends of the fixed connecting rod (601) are respectively connected to one of the positioning casting crowns (300); A movable connecting rod (602) is provided, one end of which is connected to the middle of the fixed connecting rod (601) via a rotating joint (603), wherein the direction of movement of the rotating joint (603) matches the curve of the dental arch, and the other end of the movable connecting rod (602) is connected to the movable cast crown (400). The elastic element (700) is disposed between the fixed connecting rod (601) and the movable connecting rod (602) along the moving direction of the rotating pair (603).

6. A maxillary alveolar bone segment traction device according to claim 5, characterized in that, When there are multiple movable casting crowns (400), the movable connecting rod (602) is connected to the movable casting crown (400) located in the middle.

7. A maxillary alveolar bone segment traction device according to claim 5, characterized in that, An elastic element (700) is provided on each of the fixed connecting rods (601) on both sides of the moving direction of the rotating pair (603).

8. A maxillary alveolar bone segment traction device according to claim 5, characterized in that, The length of the movable connecting rod (602) is adjustable.

9. A maxillary alveolar bone segment traction device according to claim 5, characterized in that, An auxiliary cast crown (800) is provided on the tooth near the alveolar fissure (100) in the tooth between the osteotomy portion (202) and one of the molars (203). The internal traction assembly (600) also includes an auxiliary connecting rod (604). One end of the auxiliary connecting rod (604) is connected to the middle of the fixed connecting rod (601), and the other end of the auxiliary connecting rod (604) is connected to the auxiliary cast crown (800). The elastic element (700) is disposed between the auxiliary connecting rod (604) and the movable connecting rod (602).

10. A maxillary alveolar bone segment traction device according to claim 1, characterized in that, The length dimension of the elastic element (700) is adjustable.

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