Impacted tooth traction device

Abstract

The application provides a buried tooth traction device which comprises a retaining plate, a connecting rod and a traction hook, one end of the connecting rod is connected with the retaining plate, the other end of the connecting rod is connected with the traction hook, and a scale is arranged on the connecting rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oral clinical medicine, and in particular to a buried tooth traction device. BACKGROUND

[0002] Buried tooth refers to a tooth that has passed the eruption period but has not been able to erupt in the jaw tissue, with a high incidence of about 25% to 50%, often occurring in the third molar (incidence rate 3.63% to 31.98%), maxillary canine (incidence rate 0.77% to 7.92%), maxillary incisor (incidence rate 0.06% to 0.2%), and mandibular canine (incidence rate 0.92% to 5.1%) and other positions.

[0003] Buried tooth is a common cause of malocclusion, and if not treated in time, it will affect the adjacent important anatomical structures or be forced to be extracted due to abnormal root development, affecting the masticatory function and appearance, and in severe cases, affecting the patient's pronunciation, appearance and psychology. According to literature reports, the proportion of palatal impaction in buried teeth is higher than that of buccal impaction, and the proportion of labial to palatal impaction varies from 1:2 to 1:9. Taking the maxillary canine as an example, the palatal impaction accounts for about 85%, and the buccal impaction accounts for 15%. Due to anatomical position, shape and other reasons, 50.31% of the buried teeth are surgically extracted, and 31.68% of the buried teeth are surgically windowed and orthodontically guided.

[0004] Currently, in the clinical treatment of buried tooth traction, surgical windowing and orthodontic traction combined treatment is often used to assist eruption, the principle of which is to determine the buried traction possibility and bone removal range by taking CBCT and X-ray films of the buried tooth, then to remove part of the alveolar bone through surgical windowing to expose part of the crown of the buried tooth and cooperate with the adhesion of product chain-shaped lingual buttons or brackets, and at the same time, to cooperate with fixed orthodontic orthodontic treatment to make the buried tooth enter the corresponding tooth position and solve the malocclusion. During the traction of the buried tooth, the palatal impaction is difficult to be well judged in the traction direction due to the thick palatal mucosa in the anatomical structure, the brittle and inelastic mucosa, and the relatively poor visual field of the palatal operation, and there is a lack of suitable traction pieces and supporting traction methods, which leads to the failure of the traction of some palatal buried teeth. According to reports, the success rate of the traction of palatal buried teeth is about 70%, which is much lower than that of buccal impaction (90%).

[0005] The current problems in the treatment of buried tooth traction include:

[0006] (1) the problem of difficult traction caused by poor visual field and complex position;

[0007] (2) the problem of high falling rate of lingual buttons and brackets in traction;

[0008] (3) the problem that the traction piece cannot well control the direction of the traction force;

[0009] (4) the traction is prone to failure due to the failure of the traction member to quantitatively or visually display the traction amount each time. SUMMARY

[0010] In view of the above technical problems, the present application provides a buried tooth traction device, which comprises a retaining plate, a connecting rod and a traction hook, one end of the connecting rod is connected with the retaining plate, the other end of the connecting rod is connected with the traction hook, and a scale is arranged on the connecting rod.

[0011] Further, the retaining plate has a curved structure, thereby defining an outer curved surface and an inner curved surface, and the connecting rod is connected to the outer curved surface of the retaining plate.

[0012] Further, the contour of the inner curved surface is adapted to the contour of a target tooth crown.

[0013] Further, the cross section of the connecting rod perpendicular to the extending direction thereof is circular, elliptical or circular-angled polygonal.

[0014] Further, a through hole is arranged on the retaining plate.

[0015] Further, the retaining plate, the connecting rod and the traction hook are made of a metal material.

[0016] Further, the retaining plate, the connecting rod and the traction hook are integrally formed.

[0017] Further, the number of the traction hooks is at least one.

[0018] Further, the inner curved surface is subjected to roughening treatment.

[0019] Further, the surface of the retaining plate except the inner curved surface and the outer surface of the connecting rod are subjected to polishing treatment.

[0020] The buried tooth traction device of the present application aims to improve the success rate of buried tooth (especially palatal buried tooth) traction and shorten the treatment course of buried tooth in the treatment of buried tooth traction. The buried tooth traction device of the present application improves the adhesion effect with the tooth crown of the buried tooth and is not easy to fall off; the connecting rod has quantitative scale indexes, which can accurately quantify the traction amount of the buried tooth each time, thereby making the traction of the buried tooth efficient and orderly; the traction hook is suitable for controllable multi-angle and multi-direction traction; the posture of the buried tooth can be reflected through the posture of the traction hook, and the position of the buried tooth can be better grasped in cooperation with the scale of the connecting rod.

[0021] The concept, specific structure and technical effects of the present application will be further described below in combination with the drawings, so as to fully understand the purpose, features and effects of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1is a structural schematic diagram of an embedded tooth traction device according to an embodiment of the present application;

[0023] Figure 2 is a structural schematic diagram of an embedded tooth traction device according to another embodiment of the present application from another perspective.

[0024] Figure 3 is a structural schematic diagram of an embedded tooth traction device according to another embodiment of the present application, wherein the connecting rod is provided with Roman numeral markings.

[0025] Figure 4 is a structural schematic diagram of an embedded tooth traction device according to another embodiment of the present application, wherein the traction hook end is provided with an enlarged spherical structure.

[0026] Figure 5 is an effect diagram of a 3D printing model based on an embedded tooth traction device according to the present application.

[0027] Figure 6 is an effect diagram of a 3D printing model based on another embedded tooth traction device according to the present application.

[0028] Explanation of reference signs:

[0029] 100 - retaining plate, 101 - outer curved surface,

[0030] 102 - inner curved surface, 103 - through hole,

[0031] 200 - connecting rod, 201 - scale line,

[0032] 300 - traction hook, 301 - spherical structure. DETAILED DESCRIPTION

[0033] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. The drawings are schematic or conceptual drawings, and the relationship between the thickness and width of each part, as well as the proportional relationship between each part, etc., are not exactly the same as the actual values.

[0034] Figure 1 and Figure 2 shows a structural schematic diagram of an embedded tooth traction device according to an embodiment of the present application, which includes a retaining plate 100, a connecting rod 200 and a traction hook 300.

[0035] The retention plate 100 has a curved structure, thereby defining an outer curved surface 101 and an inner curved surface 102. Preferably, the profile of the inner curved surface 102 is adapted to cooperate with the crown of the impacted tooth, thereby adapting the retention plate to be connected to the crown of the impacted tooth. In some embodiments, the shape of the retention plate 100 is defined or generated from a three-dimensional image of the impacted tooth based on the CBCT of the patient, and is connected to the position of the impacted tooth as needed, the profile of which determines the profile of the inner curved surface 102 of the retention plate 100, and part or all of the outer curved surface 101 can be defined by a curved surface equidistant from the inner curved surface 102, at which time the outer curved surface 101 also has substantially the same profile as the inner curved surface 102, and the distance between the two defines the thickness of the retention plate 100.

[0036] The retention plate 100 is also provided with a through hole 103, and preferably a plurality of through holes 103 are distributed at different positions of the retention plate 100 to facilitate the light curing projection required for the bonding of the retention plate 100 to the impacted tooth.

[0037] In some embodiments, the inner curved surface 102 of the retention plate 100 is also subjected to roughening treatment to further improve the bonding effect of the retention plate 100 to the impacted tooth.

[0038] The connecting rod 200 is a rod-shaped component extending in a straight line, one end of which is connected to the retention plate 100, specifically to the outer curved surface 101 of the retention plate 100. The extension direction of the connecting rod 200 is preferably consistent with the direction of the long axis of the impacted tooth. The shape of the connecting rod 200 can be cylindrical, elliptical cylindrical or polygonal with rounded corners, such as rounded quadrilateral, rounded triangular, etc.; or the cross section of the connecting rod 200 perpendicular to the extension direction thereof is circular, elliptical or polygonal with rounded corners, such as rounded quadrilateral, rounded triangular, etc.

[0039] The connecting rod 200 is also provided with a plurality of scale lines 201, each of which is equidistantly arranged, such as 1mm apart. The scale lines 201 facilitate the observation of the traction of the impacted tooth by the clinician. In the present embodiment, the scale lines 201 are defined by grooves on the outer periphery of the connecting rod 200, and similarly, the scale lines 201 can also be defined by protrusions; each scale line 201 is a closed curve around the outer periphery of the connecting rod 200, which is in the same plane, and the plane is perpendicular to the extension direction of the connecting rod 200.

[0040] In other embodiments, in addition to the scale lines 201, the connecting rod 200 is also provided with symbol marks corresponding to the scale lines 201, such as numerical symbol marks or alphabetical symbol marks indicating the order of the scale lines. As shown, the order numbers I, II, III, IV, V are marked above the corresponding scale lines 201 with Roman numerals, which facilitates the clinician to identify the corresponding scale lines. Figure 3 ​Figure 3 In some embodiments, the Roman numerals are aligned along the extension direction of the connecting rod 200, and in other embodiments, the Roman numerals are staggered at corresponding sides of the connecting rod 200 or at a certain angle in the circumferential direction, so that at least one sequential number can be seen at all times even at different observation angles.

[0041] The traction hooks 300 are connected to the other end of the connecting rod 200 away from the retention plate 100, for enabling the traction chain / cable to hook the traction hooks 300 to achieve traction of the impacted tooth during the treatment process. In this embodiment, the traction hooks 300 adopt a round arc hook structure, and the number is 2. In actual application, the shape of the traction hooks 300 can adopt many different shapes as long as it is suitable for connecting the traction chain / cable, and the corresponding number can be set as needed, which is not limited here.

[0042] In other embodiments, the end of the traction hook 300 is set to a structure that is thicker than the rest, such as Figure 4 As shown, the end of the traction hook 300 is set to an enlarged spherical structure 301, so as to further prevent the traction chain / cable from slipping out.

[0043] In some embodiments, the length of the connecting rod 200 and the number and direction of the traction hooks 300 are determined according to the thickness of the surface mucosa soft tissue of the impacted tooth and the preset traction path of the impacted tooth, so that the traction hooks 300 can always be exposed in the oral cavity during multi-angle and multi-direction traction and cannot be hung due to being wrapped by soft tissue. After the retention plate 100 is connected with the impacted tooth, preferably, the length of the connecting rod 200 can make it protrude from the surface mucosa soft tissue by about 1 mm.

[0044] In this embodiment, the retention plate 100, the connecting rod 200 and the traction hook 300 can be integrally formed by 3D printing, and the printing material is selected from metal materials such as stainless steel, nickel-chromium alloy, cobalt-chromium alloy, etc. The wax type can also be printed by a 3D printer first, and then casted by selecting a metal material. The inner curved surface 102 of the retention plate 100 is roughened, and the rest of the impacted tooth traction device is polished.

[0045] The structure of the impacted tooth traction device and its manufacturing are further described below in combination with the digital auxiliary treatment method of the impacted tooth.

[0046] The existing oral three-dimensional image reconstruction method mainly includes the following contents:

[0047] (1) The CBCT of the patient's oral dentition is imported into a three-dimensional editing software (such as Dolphin, ProPlan, Geomagic, etc.), and the tooth root and alveolar bone reconstruction is completed in the three-dimensional editing software;

[0048] (2) Obtain the 3D scanning model data of the patient's mouth by using an intraoral scanner to complete the reconstruction of the intraoral crown and soft tissue;

[0049] (3) Fit the data of the tooth root and alveolar bone and the data of the intraoral crown and soft tissue obtained above to completely reconstruct the three-dimensional image of the tooth, alveolar bone and soft tissue.

[0050] According to the three-dimensional image obtained above, the clinician can more intuitively obtain the position of the embedded tooth and its relative position with other teeth, alveolar bone and soft tissue, so as to design the embedded tooth traction treatment plan, traction path and traction device accordingly.

[0051] Under the premise that the traction treatment plan has been determined, the embedded tooth traction device of the present application can better cooperate with the preset plan to achieve the expected traction path. For the shape of the retention plate 100 of the embedded tooth traction device, specifically for the profile of the inner curved surface 102 of the retention plate 100, it can be determined according to the surface profile of the embedded tooth crown exposed after the preset surgical windowing, or according to the preset traction treatment plan, that is, the bonding surface of the embedded tooth traction device and the embedded tooth is determined, which limits the profile of the inner curved surface 102. On the basis of the profile of the inner curved surface 102, a certain thickness is set to obtain the main structure of the retention plate 100. The extension direction of the connecting rod 200 is preferably consistent with the direction of the long axis of the embedded tooth; the length of the connecting rod 200 and the number and direction of the traction hooks 300 can be determined according to the thickness of the surface mucosa soft tissue of the embedded tooth and the traction path in the preset traction treatment plan, so that the traction hooks 300 can always be exposed in the oral cavity during the multi-angle and multi-direction traction process, and will not be wrapped by soft tissue and cannot be hung for traction. When the retention plate 100 is connected with the embedded tooth, preferably, the length of the connecting rod 200 is at least 1mm higher than the surface mucosa soft tissue.

[0052] In other embodiments, the shape of the traction hook 300 is limited according to the sagittal position (buccal-lingual position) of the embedded tooth, specifically the direction and shape of the traction hook 300 exposed in the oral cavity is approximately the projection of the embedded tooth crown in the mouth, so as to facilitate the clinician to observe and judge the changes of the position and angle of the tooth torque by naked eye.

[0053] After the overall structure of the embedded tooth traction device (including the retention plate 100, the connecting rod 200 and the traction hook 300) is determined, a 3D model file (such as an STL file) is generated, and the embedded tooth traction device of the present embodiment is formed by 3D printing. Figure 5 and Figure 6 are respectively an effect picture of a 3D printed model based on the embedded tooth traction device of the present application.

[0054] The three-dimensional modeling and 3D printing of obtaining and utilizing model data in the above can adopt the existing methods in the art. For example, a Chinese patent application with application number 201911352956.7 and the title of “A method of designing an embedded tooth traction in cooperation with a 3D printed model” discloses a technical solution of designing an embedded tooth traction path through three-dimensional modeling. For example, a Chinese patent application with application number 201911247453.3 and the title of “A method of manufacturing an individualized bone windowing guide plate for an embedded tooth” discloses a technical solution of preparing an auxiliary device based on an intraoral scanner and CBCT data and utilizing 3D printing technology. The present application provides an embedded tooth traction device that can be manufactured by the existing digital methods (such as 3D printing) and is suitable for cooperating with the existing digital methods for embedded tooth traction treatment, so as to assist the clinician in the traction process, more easily grasp the position of the embedded tooth and control the traction path, so as to make the treatment achieve the expected effect.

[0055] The use of the embedded tooth traction device of the present embodiment is further described below.

[0056] The surgical operation is performed to expose the embedded tooth crown by bone windowing, and the embedded tooth traction device of the present embodiment is bonded to the embedded tooth crown by bonding material, specifically, the inner curved surface 102 of the retention plate 100 is bonded to the surface of the corresponding embedded tooth (consistent with the profile of the inner curved surface 102). Then, light curing projection is performed, and the through hole 103 on the retention plate 100 is beneficial to the projection light irradiating on the bonding material.

[0057] The traction chain / wire is installed on the traction hook 300 to implement traction on the embedded tooth. During the patient's follow-up visit during the traction treatment, the clinician can accurately measure and control the traction amount of the embedded tooth at different periods according to the scale line 201 on the connecting rod 200, and can understand the current posture of the embedded tooth through the posture of the traction hook 300 in the oral cavity, so as to adjust the traction direction and intensity of the embedded tooth in a targeted manner until the embedded tooth is tractioned to the expected position.

[0058] The above describes the preferred embodiments of the present application in detail. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution that can be obtained by logical analysis, reasoning or limited experiment based on the existing technology according to the concept of the present application should be within the protection scope determined by the claims.

Claims

1. An embedded tooth traction device, characterized by, The device comprises a retaining plate, a connecting rod and a traction hook, one end of the connecting rod is connected with the retaining plate, the other end is connected with the traction hook, and a scale is arranged on the connecting rod; the retaining plate has a curved structure, thereby defining an outer curved surface and an inner curved surface, the connecting rod is connected to the outer curved surface of the retaining plate; the contour of the inner curved surface is adapted to the contour of a target tooth crown; the extension direction of the connecting rod is consistent with the long axis direction of the target tooth; a through hole is arranged on the retaining plate to facilitate the light curing projection required for bonding the retaining plate with the target tooth.

2. An embedded tooth retraction device as claimed in claim 1, wherein, The cross section of the connecting rod perpendicular to the extension direction thereof is circular, elliptical or round-cornered polygonal.

3. The embedded tooth retraction device of claim 1, wherein, The retaining plate, the connecting rod and the traction hook are made of metal material.

4. The embedded tooth retraction device of claim 1, wherein, The retaining plate, the connecting rod and the traction hook are integrally formed.

5. The embedded tooth retraction device of claim 1, wherein, The number of the traction hooks is at least one.

6. The embedded tooth retraction device of claim 1, wherein, The inner curved surface is roughened.

7. The embedded tooth retraction device of claim 1, wherein, The surface of the retaining plate except the inner curved surface and the outer surface of the connecting rod are polished.

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