A scanning aid for acquiring a shape of a pile channel

Abstract

The application relates to the technical field of dentistry, in particular to a scanning auxiliary device for obtaining a pile channel shape. The scanning auxiliary device comprises a main body, a positioning part and an extension part; the main body is in a rod-shaped structure, and the main body further has a connecting structure which is configured to enable impression material to pass through the connecting structure and enter the main body, wherein the cross-sectional size of the main body gradually decreases from a first end to a second end in the length direction; the positioning part has a first connecting surface and a second connecting surface which are parallel to each other, wherein the first connecting surface is connected with the first end of the main body; and the extension part is connected with the second connecting surface of the positioning part. The application can avoid the falling of the impression material and is favorable for improving the production efficiency of a complete impression of the pile channel.

Description

Technical Field

[0001] This application relates to the field of dental technology, and more specifically to a scanning aid for acquiring post morphology. Background Technology

[0002] Tooth defects are a common and frequently occurring condition in oral clinical practice. When a tooth is severely damaged, the remaining tooth structure is insufficient, reducing the bonding area. In such cases, a post-core crown is typically used to complete the superstructure restoration. The post provides retention for the superstructure core, while the superstructure core provides retention for the superstructure crown. To create space to accommodate the post, a post channel needs to be prepared inside the root canal of the abutment tooth. This channel is usually elongated along the long axis of the tooth (i.e., the length of the post channel is significantly greater than its diameter). After the post channel is prepared, its shape and position relative to the dentition are transferred externally using traditional or digital methods. In traditional methods, a more fluid impression material (lightweight material) is used to obtain the post channel and detailed tooth surface features, while a less fluid impression material (heavyweight material) serves as the base material for connection to the tray. In this approach, to ensure the strength of the impression material within the post channel, metal or resin reinforcing post is required. The shortcomings are: (1) The direction of tray dislocation is inconsistent with the long axis of the post channel. When removing it, it is easy to cause friction between the reinforcing pin in the post channel and the post channel, causing the lightweight material on its surface to fall off and deform, and even causing the reinforcing pin to bend and chair; (2) It requires a large amount of impression material. Once a situation arises where it needs to be remade, it may aggravate the discomfort of the operator. For the digital method, the intraoral impression device is used directly to make the morphology of the dentition and the post channel. The shortcomings are: (1) The intraoral scanner cannot obtain the morphology of relatively narrow and relatively long post channels; (2) The intraoral scanner cannot simultaneously and accurately obtain the edge line of the upper preparation body.

[0003] An existing patent (CN222487704U) discloses "a scanning column inside the root canal of a pile core." In this solution, the scanning column is matched with the drill bit. After scanning is completed, the pre-stored specifications and dimensions of the scanning column are directly used to replace the scanning data, thereby obtaining the pile channel morphology. However, during the pile channel preparation process, the operator's slight movements and deviations can cause the drill bit to move and deviate within the root canal, resulting in the actual obtained pile channel morphology being larger than the drill bit's shape. In this case, the scanning column cannot be fixed within the pile channel, and shaking during scanning will lead to inaccurate data collection. Due to the limitations of the pre-formed scanning column's shape, the above solution is only applicable to pre-formed conical pile channels and not to flat, oval pile channels.

[0004] An existing patent (CN117530793A) discloses "a scanning rod and a digital method for taking a complete impression of a tooth channel using a scanning rod." The scanning rod used in this solution has a smooth surface and no mechanical retention design. When used in conjunction with lightweight silicone rubber, the impression material still falls off. In this solution, the feature part, clamping part, and anti-rotation part of the scanning rod are located on the abutment tooth. After installation in the mouth, the height of the scanning rod significantly exceeds the tooth row, which is not conducive to the smooth scanning. When scanning alone outside the body, the overall length of the scanning rod in this solution is not conducive to individual scanning and splicing. In addition, if this scanning rod is used, at least three scans (scanning before the scanning rod is in place, scanning after the scanning rod is in place, and scanning of the scanning rod alone) and two fitting operations are required, which is complicated and has a large cumulative error. Utility Model Content

[0005] The purpose of this application is to provide a scanning auxiliary device for obtaining the shape of pile channels, which solves the problems of mold deformation caused by the inconsistency between the tray dislocation direction and the long axis of the pile channel in the existing traditional technology, and the need to make multiple molds.

[0006] This application is achieved through the following technical solution:

[0007] A scanning auxiliary device for acquiring the morphology of pile channels, comprising:

[0008] The main body is a rod-shaped structure, and the main body also has a connecting structure configured to allow the impression material to enter the main body through the connecting structure, wherein the cross-sectional size of the main body gradually decreases from a first end to a second end in its length direction;

[0009] The positioning part has a first connecting surface and a second connecting surface that are parallel to each other, wherein the first connecting surface is connected to a first end of the main body;

[0010] An extension portion, wherein the extension portion is connected to the second connecting surface of the positioning portion.

[0011] The scanning auxiliary device for acquiring post morphology provided in this application has a main body designed as a rod-shaped structure with a gradually changing cross-section, which conforms to the shape of a typical post preparation pin, thus improving the adaptability of the device. The connecting structure on the main body allows the impression material to enter the main body, thereby achieving a strong connection between the main body and the impression material, preventing the impression material from falling off during the removal of the device. Furthermore, during removal, the device can be removed along the long axis of the post, avoiding the problem of difficulty in removal caused by the inconsistency between the scanning rod and the tooth avulsion direction. In addition, when using this device for scanning, the edge line of the preparation body and the post morphology can be accurately acquired simultaneously, which is not only beneficial for the fabrication of the post core, but also enables the simultaneous design and fabrication of the crown, reducing the fabrication cycle.

[0012] In some alternative embodiments, the interconnect structure is configured as a through hole.

[0013] In some alternative embodiments, the connecting structure is formed as a groove.

[0014] In some alternative embodiments, the connecting structure includes a through hole and a groove, wherein the through hole is located near a first end and the groove is located near a second end.

[0015] In some alternative embodiments, the cross-sectional shape of the body is circular.

[0016] In some alternative embodiments, the diameter of the body decreases uniformly from the first end to the second end.

[0017] In some optional embodiments, the positioning part is provided with a plurality of connecting holes.

[0018] In some alternative embodiments, the edge of the positioning portion is a bent structure that curves toward the body, wherein the connecting hole is located on the bent structure.

[0019] In some alternative embodiments, the extension has a mating hole.

[0020] In some optional embodiments, the maximum span of the cross-section at the first end is 1~3mm, and the maximum span of the cross-section at the second end is 0.5~1mm.

[0021] Compared with the prior art, this application has the following advantages and beneficial effects:

[0022] The scanning auxiliary device for acquiring post morphology provided in this application has a main body designed as a rod-shaped structure with a gradually changing cross-section, which conforms to the shape of a typical post preparation pin, thus improving the adaptability of the device. The connecting structure on the main body allows the impression material to enter the main body, thereby achieving a strong connection between the main body and the impression material, preventing the impression material from falling off during the removal of the device. Furthermore, during removal, the device can be removed along the long axis of the post, avoiding the problem of difficulty in removal caused by the inconsistency between the scanning rod and the tooth avulsion direction. In addition, when using this device for scanning, the edge line of the preparation body and the post morphology can be accurately acquired simultaneously, which is not only beneficial for the fabrication of the post core, but also enables the simultaneous design and fabrication of the crown, reducing the fabrication cycle. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the embodiments of this application and form part of this application, do not constitute a limitation on the embodiments of this application. In the drawings:

[0024] Figure 1 A schematic diagram of a scanning auxiliary device for obtaining the shape of a pile channel, provided in an embodiment of this application;

[0025] Figure 2 A top view of the scanning auxiliary device for acquiring the shape of pile channels provided in an embodiment of this application;

[0026] Figure 3 A schematic diagram of another scanning auxiliary device for obtaining the shape of a pile channel provided in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of another scanning auxiliary device for obtaining the shape of pile channels, provided in an embodiment of this application.

[0028] The attached diagram shows the markings and corresponding component names:

[0029] 1-Main body; 11-Through hole; 12-Groove; 2-Positioning part; 21-Connecting hole; 3-Extension part. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0031] like Figures 1-2 As shown, this application embodiment provides a scanning auxiliary device for acquiring the shape of a pile channel. The scanning auxiliary device for acquiring the shape of a pile channel includes a main body 1, a positioning part 2, and an extension part 3. The main body 1 has a rod-shaped structure and also has a connecting structure. The connecting structure is configured to allow the impression material to enter the main body 1 through the connecting structure. The cross-sectional size of the main body 1 gradually decreases from a first end to a second end in its length direction. The positioning part 2 has a first connecting surface and a second connecting surface that are parallel to each other. In actual implementation, the positioning part 2 can be designed as a square plate. The thickness of the positioning part 2 is usually designed to be 2mm. The first connecting surface and the second connecting surface are the two plate surfaces of the positioning part 2, respectively. The first connecting surface is connected to the first end of the main body 1. The extension part 3 is connected to the second connecting surface of the positioning part 2.

[0032] The scanning auxiliary device for acquiring the morphology of the post and channel provided in this application embodiment has a main body 1 designed as a rod-shaped structure with a gradually changing cross-section, which conforms to the shape of a general post and channel preparation pin, thus improving the adaptability of the device. The connecting structure on the main body 1 allows the impression material to enter the main body 1, thereby achieving a strong connection between the main body 1 and the impression material, preventing the impression material from falling off during the removal of the device. Furthermore, during the removal process, the device can be removed along the long axis of the post and channel, avoiding the problem of difficulty in removal caused by the inconsistency between the scanning rod and the tooth avulsion direction. In addition, when using this device for scanning, the edge line of the preparation body and the morphology of the post and channel can be accurately acquired simultaneously, which is not only beneficial for the fabrication of the post and core, but also enables the simultaneous design and fabrication of the crown, reducing the fabrication cycle.

[0033] In this embodiment, the main body 1, the positioning part 2, and the extension part 3 can be three independent structures, which are formed into a whole by welding and gluing; the main body 1, the positioning part 2, and the extension part 3 can also be an integrally molded structure obtained by casting. The main body 1, the positioning part 2, and the extension part 3 can be made of polymer materials such as polymethyl methacrylate, polyetheretherketone, and polyetherketoneketone, or they can be made of metals such as medical-grade stainless steel and aluminum alloy.

[0034] In some alternative embodiments, the connecting structure can be a through hole 11, a groove 12, or a combination of the two.

[0035] When the connecting structure is constructed as a through hole 11, the number of through holes 11 can be one or more. When there is only one through hole 11, the cross-sectional area of ​​the through hole 11 is relatively large to increase the amount of molding material entering the main body 1. When there are multiple through holes 11, the cross-sectional area of ​​the through holes 11 is relatively small to prevent a sudden drop in the structural strength of the main body 1 itself. Furthermore, when there are multiple through holes 11, the multiple through holes 11 can be arranged at intervals along the length direction of the main body 1. On this basis, the multiple through holes 11 can also be evenly distributed around the length direction of the main body 1, that is, multiple... The through holes 11 are arranged in a three-dimensional spiral pattern. Furthermore, among the multiple through holes 11, the cross-sectional area of ​​the through hole 11 closer to the first end can be larger than that of the through hole 11 farther from the first end. In addition, the cross-sectional shape of the through holes 11 is generally not limited; it can be, for example, circular, triangular, elliptical, star-shaped, or rectangular. To ensure the structural strength of the molded material within the through holes 11 after curing, the through holes 11 are generally designed as circular holes, with a diameter generally designed to be 0.25~0.5mm, and the extension direction of the through holes 11 is generally designed as a straight line. In other embodiments, the extension direction of the through holes 11 can also be a curve, a broken line, or a combination of both.

[0036] When the connecting structure is formed as a groove 12, the number of grooves 12 can also be one or more. When there is only one groove 12, the volume of the groove 12 is relatively large to increase the amount of molding material entering the main body 1; when there are multiple grooves 12, the volume of the grooves 12 is relatively small to prevent a sudden drop in the structural strength of the main body 1 itself; furthermore, when there are multiple grooves 12, the multiple grooves 12 can be arranged at intervals along the length direction of the main body 1. On this basis, the multiple grooves 12 can also be evenly distributed around the length direction of the main body 1, that is, the multiple grooves 12 form a three-dimensional spiral. The grooves are arranged in a spiral pattern. Furthermore, among the multiple grooves 12, the volume of the groove 12 closer to the first end can be larger than that of the groove 12 farther from the first end. In addition, the shape of the groove opening is generally not limited, meaning the overall shape of the groove 12 can be such as a circular groove, square groove, triangular groove, elliptical groove, etc. To ensure ease of manufacturing, the groove 12 is usually designed as an elliptical or circular groove. The depth direction of the groove 12 is generally a straight line, meaning the groove 12 is a straight groove, and the depth of the groove 12 is generally designed to be 0.1~0.5mm. In other embodiments, the depth direction of the groove 12 can also be a curve, a broken line, or a combination of both.

[0037] When the connecting structure includes through holes 11 and grooves 12, the through holes 11 and grooves 12 are arranged separately. Specifically, the through holes 11 are closer to the first end, and the grooves 12 are closer to the second end. There are multiple through holes 11 and multiple grooves 12. In actual implementation, the main body 1 can be divided into three equal parts along the length direction, namely the first segment, the second segment and the third segment. The through holes 11 are located in the first segment, and the grooves 12 are located in the second segment. In other embodiments, the arrangement of the through holes 11 and the grooves 12 can also be implemented as follows: any through hole 11 is closer to the first end than all the grooves 12, and any groove 12 is closer to the second end than all the through holes 11.

[0038] The cross-sectional shape of the main body 1 is generally not limited, and it can be designed as a circle, ellipse, rectangle, triangle, etc. In order to facilitate processing and manufacturing, in some optional embodiments, the cross-sectional shape of the main body 1 is circular. In particular, when a straight through hole 11 is opened on the main body 1, the extension direction of the through hole 11 coincides with the radial direction of the main body 1. The length of the main body 1 is generally 4~16mm, and preferably designed to be 10mm.

[0039] The extension direction of the main body 1 is generally not limited, and it can be designed as a bent rod, stepped rod, toothed rod, straight rod, etc. In order to facilitate processing and manufacturing, in some optional embodiments, the diameter of the main body 1 decreases uniformly from the first end to the second end, that is, the overall shape of the main body 1 is a frustum. The diameter of the first end of the main body 1 is generally 1~3mm, preferably 1.3mm, and the diameter of the second end is 0.5~1mm, preferably 0.7mm. In particular, when the cross-sectional shape of the main body 1 is other shapes, the maximum span of the cross-section at the first end of the main body 1 is designed to be 1~3mm, and the maximum span of the cross-section at the second end is designed to be 0.5~1mm. Taking a standard ellipse as an example, the maximum span of the cross-section here is the length of the major axis of the ellipse.

[0040] In some optional embodiments, the positioning part 2 is provided with a plurality of connecting holes 21, similar to the through hole 11 mentioned above. The shape and size of the connecting holes 21 are generally not limited. In actual implementation, it is preferred to design them as round holes, and the extension direction of the connecting holes 21 is parallel to the length direction of the main body 1.

[0041] In some alternative embodiments, such as Figure 3 As shown, the edge of the positioning part 2 is a bent structure that bends toward the main body 1, wherein the connecting hole 21 is located on the bent structure.

[0042] In this embodiment, the bending structure that bends toward the main body 1 means that the edge of the positioning part 2 is closer to the main body 1. The angle between the bending structure and the positioning part 2 can be 0~90°, preferably designed as 45°. This design can enhance the wrapping effect of the positioning part 2 on the impression material.

[0043] In some alternative embodiments, such as Figure 4 As shown, the extension 3 is provided with a mating hole. In actual implementation, the overall shape of the extension 3 is disc-shaped. In other embodiments, the overall shape of the extension 3 can also be designed as spherical, crown-shaped, etc. The length direction of the main body 1 coincides with the radial direction of the extension 3, and the axis of the mating hole coincides with the axis of the extension 3, so that it is convenient for the operator to hold.

[0044] The scanning auxiliary device (hereinafter referred to as the device) for obtaining the shape of pile channels provided in the above embodiments can realize the following scanning process:

[0045] (1) The morphology of the dentition and supragingival preparation was obtained using an intraoral scanner and recorded as data 1;

[0046] (2) Measure the length of the prepared post channel, for example, 8 mm. Select a device with a main body 1 length of 8 mm. Use a dental handpiece to grind the tip of the second end (the thinner end) of the main body 1 by 0.1 mm. According to the diameter of the drill bit used for preparation (the thickest is 1.6 mm and the thinnest is 0.8 mm), determine the diameter of the first end (the thicker end) of the main body 1 to be 1.5 mm and the diameter of the second end to be 0.7 mm. Try on the selected device. After inserting it into the post channel, there is a gap of 0.1 mm between the positioning part 2 and the prepared body.

[0047] (3) Use gingival retraction line to expose the edge completion line of the preparation body; inject lightweight silicone rubber impression material into the post channel and around the edge completion line of the preparation body, and use a dental three-way gun to gently blow to make the impression material penetrate into the gap; hold the extension 3 of the device, insert the device body 1 determined in step (2) into the post channel, and wait for the impression material between the body 1 and the post channel, and between the positioning part 2 and the preparation body to fully cure;

[0048] (4) Hold the extension 3, remove the device, use an intraoral scanner to obtain the main body 1 and the positioning part 2 near the main body 1, which are wrapped by the impression material, including the post channel part, the supragingival preparation body and the edge line part, and flip the data normal to obtain data 2.

[0049] (5) In a three-dimensional data editing software such as Geomagic, select the common preparation features on data 2 and data 1 (select at least three pairs of fitting points), fit data 2 onto data 1; trim the preparation part on data 1, and then merge it with data 2 to obtain data 3. Data 3 has accurate post and core morphology, preparation edge line and relative positional relationship with the dentition, which is used for the precise design and fabrication of post and core crowns.

[0050] Therefore, compared with the prior art, the scanning auxiliary device for obtaining post morphology provided in this application only requires two scans. The first scan obtains the morphology of the dentition and the currently exposed supragingival preparation in the mouth, and the second scan obtains the post, supragingival preparation and marginal line. Based on the morphology of the supragingival preparation, the data from the two scans can be directly fitted, reducing the number of scans and fittings.

[0051] The specific embodiments described above illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0052] It should be noted that in this specification, similar reference numerals and letters in the above figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this application, it should be noted that unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A scanning auxiliary device for acquiring the morphology of pile channels, characterized in that, include: The main body (1) is a rod-shaped structure and also has a connecting structure configured to allow the impression material to enter the main body (1) through the connecting structure, wherein the cross-sectional size of the main body (1) gradually decreases from a first end to a second end in its length direction; The positioning part (2) has a first connecting surface and a second connecting surface that are parallel to each other, wherein the first connecting surface is connected to the first end of the main body (1); The extension (3) is connected to the second connecting surface of the positioning part (2).

2. The scanning auxiliary device for acquiring the morphology of pile channels according to claim 1, characterized in that, The connecting structure is constructed as a through hole (11).

3. The scanning auxiliary device for acquiring the morphology of pile channels according to claim 1, characterized in that, The connecting structure is formed as a groove (12).

4. Scanning aid for acquiring a shape of a pile channel according to claim 1, characterized in that, The connecting structure includes a through hole (11) and a groove (12), wherein the through hole (11) is close to the first end and the groove (12) is close to the second end.

5. Scanning aid for acquiring a shape of a pile channel according to claim 1, characterized in that, The cross-sectional shape of the main body (1) is circular.

6. Scanning aid for acquiring a shape of a pile channel according to claim 5, characterized in that, The diameter of the main body (1) decreases uniformly from the first end to the second end.

7. The scanning auxiliary device for acquiring the morphology of pile channels according to claim 6, characterized in that, The positioning part (2) has several connecting holes (21).

8. The scanning auxiliary device for acquiring the morphology of pile channels according to claim 7, characterized in that, The edge of the positioning part (2) is a bent structure that bends toward the main body (1), wherein the connecting hole (21) is located on the bent structure.

9. The scanning auxiliary device for acquiring the morphology of pile channels according to claim 8, characterized in that, The extension (3) has a mating hole.

10. Scanning aid for acquiring a shape of a pile channel according to claim 1, characterized in that, The maximum span of the cross-section at the first end is 1~3mm, and the maximum span of the cross-section at the second end is 0.5~1mm.

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