A scanning rod and a digital method for making a complete impression of a pile channel by using the scanning rod

Abstract

This invention provides a scanning rod and a digital method for taking a complete impression of the root canal using the scanning rod, relating to the field of oral medicine. The method includes: scanning the patient's oral cavity using an intraoral scanner to obtain an initial digital model of the dentition; injecting a silicone rubber lightweight material into the root canal post using a syringe, and inserting the scanning rod into the root canal post while waiting for the impression material to cure; scanning the affected tooth with the scanning rod and a predetermined number of teeth on either side of the affected tooth using the intraoral scanner to obtain the scanning rod and the digital model of the dentition. The digital method for taking a complete impression of the root canal using the scanning rod provided by this invention avoids the problems of reduced accuracy and patient discomfort caused by large-area impression taking. By matching the digital model of the dentition, the scanning rod and the digital model of the dentition, and the digital impression of the post, the post data obtained is reduced, and the accuracy of the post is improved.

Description

Technical Field

[0001] This invention relates to the field of oral healthcare, and more particularly to a scanning rod and a digital method for taking a complete impression of the post channel using the scanning rod. Background Technology

[0002] Post and core restoration is a widely accepted dental restoration technique. When the remaining usable tooth structure is insufficient to form a sufficient crown retention, a post and core are usually needed to provide support and retention for the final crown restoration.

[0003] Currently, post and canal model acquisition can be categorized into three types: traditional impression making, indirect digital scanning, and direct digital scanning. The traditional method involves obtaining a post and canal impression using silicone rubber after preparation, then creating a plaster model; or directly casting a mold inside the patient's mouth, followed by casting the post and canal core. The indirect digital method involves scanning the impression, mold, or plaster model obtained through traditional techniques, or combining an intraoral scanner with the impression used for model scanning, thus converting it into a digital model. The fully digital scanning method uses an intraoral scanner to scan a scanning rod matched to a specific drill bit used for root canal preparation, and then uses specific software to automatically calculate the position and depth of the post and canal, thereby obtaining post and canal data.

[0004] Traditional post and core impressions can be affected by human factors, as well as the expansion, contraction, and deformation of impression and plaster materials, leading to decreased precision in post and core restoration fabrication. Furthermore, the large impression area may cause discomfort to the patient. Indirect digital scanning impressions, especially those taken with intraoral scanners, may result in incomplete scans and decreased scanning accuracy due to excessive depth or undercuts in individual teeth. Direct digital scanning only provides the direction and depth of the post and core, not its complete morphology. This leads to poor fit between the fabricated post and core and the root canal, particularly in cases of elliptical root canals where uneven bonding thickness between the post and core material and the canal wall causes uneven stress distribution, resulting in suboptimal long-term therapeutic effects. Summary of the Invention

[0005] This invention provides a digital method for creating a complete impression of the pile channel using a scanning rod, which solves the problems of poor accuracy, unstable connection between the pile core material and the root canal wall, and poor comfort in the existing technology.

[0006] This invention provides a digital method for creating a complete impression of a pile channel using a scanning rod, comprising:

[0007] An initial digital model of the dentition is obtained by scanning the patient's mouth with an intraoral scanner.

[0008] The silicone rubber lightweight material is injected into the root canal channel using a syringe, and the scanning rod is inserted into the root canal channel to wait for the impression material to cure, thus obtaining the impression of the root canal channel.

[0009] The affected tooth with the scanning rod and a predetermined number of teeth on both sides of the affected tooth are scanned by an intraoral scanner to obtain a digital model of the scanning rod and the dentition containing the positional relationship between the scanning rod and the dentition of the affected tooth.

[0010] After the scanning rod and the pile impression are removed from the mouth, the complete pile impression and feature parts of the scanning rod are obtained by the intraoral scanner, resulting in a scanning rod and a digital pile impression with a complete pile shape.

[0011] The digital model of the post is obtained based on the initial dentition digital model, the scanning rod and the dentition digital model, and the scanning rod and the post digital impression.

[0012] A digital method for taking a complete impression of a post channel using a scanning rod, according to an embodiment of the present invention, includes the step of scanning the patient's mouth with an intraoral scanner, comprising:

[0013] Scan the dental arch containing the affected tooth;

[0014] The dental arch on the opposite side of the affected tooth is scanned. The scanned area of ​​the dental arch containing the affected tooth includes the affected tooth and 2-3 teeth on either side of the affected tooth. The scanned area of ​​the dental arch on the opposite side of the affected tooth includes the tooth on the opposite side and 2-3 teeth on either side of the tooth on the opposite side. If the affected tooth is the last posterior tooth, only the affected tooth and 2-3 teeth adjacent to it need to be scanned.

[0015] The occlusal relationship between the maxillary and mandibular arches was scanned.

[0016] According to an embodiment of the present invention, a digital method for taking a complete impression of the root canal channel using a scanning rod is provided, which further includes, before the step of injecting a lightweight silicone rubber mass into the root canal channel using a syringe:

[0017] The scanning rod is tested inside the pile channel to determine the depth of the pile channel.

[0018] According to an embodiment of the present invention, a digital method for taking a complete impression of a root canal using a scanning rod, after the step of inserting the scanning rod into the root canal and waiting for the impression material to cure, further includes:

[0019] Determine whether the molding compound completely covers the anti-rotation structure;

[0020] If it is determined that the impression material does not completely cover the anti-rotation structure, the impression material is injected again to completely cover the anti-rotation structure, ensuring that the feature portion and adjacent teeth are not covered by the impression material.

[0021] A digital method for obtaining a complete impression of a pile channel using a scanning rod according to an embodiment of the present invention includes the step of obtaining the complete impression of the pile channel and its feature parts by an intraoral scanner, comprising:

[0022] Remove the scanning rod and the impression of the post from the oral cavity together;

[0023] Powder is sprayed onto the surface of the pile impression.

[0024] The clamping part of the scanning rod is clamped by the clamping member;

[0025] The complete impression of the pile path and its features are obtained by an intraoral scanner.

[0026] A digital method for obtaining a complete impression of a post track using a scanning rod, according to an embodiment of the present invention, includes the step of obtaining a digital model of the post track based on an initialized digital model of the dental arch, the digital model of the dental arch using the scanning rod, and the digital impression of the post track using the scanning rod.

[0027] Using the scanning rod and the digital dental arch model as targets, the adjacent teeth of the affected tooth in the initialized digital dental arch model are used as the registration area for registration operation;

[0028] The scanning rod and the digital dental model are registered with the digital dental model and the digital dental model using the feature area of ​​the digital impression of the dental arch as the registration area.

[0029] The initial dentition digital model with deleted post data is fused with the digital impression of the scanning rod and post with deleted scanning rod portion to obtain a post digital model with post data information and the position information of the affected tooth and the adjacent teeth of the affected tooth.

[0030] A digital method for obtaining a complete impression of a dental arch using a scanning rod, according to an embodiment of the present invention, further includes, before fusing the initialized dental arch digital model with the deleted dental arch data and the digital impression of the scanning rod and dental arch with the deleted scanning rod portion, the method further includes:

[0031] The normals of the scanning rod and the digital imprint of the pile channel are flipped.

[0032] The present invention also provides a scanning rod, which is used in the digital method for making a complete impression of a pile channel using a scanning rod as described in any of the above claims, comprising a clamping part, a feature part, and a tapered rod connected in sequence, wherein the tapered rod is provided with an anti-rotation structure.

[0033] According to an embodiment of the present invention, a scanning rod is provided, wherein the outer peripheral surface of the clamping part is provided with a clamping surface, the clamping surface is a plane, the height of the feature part is 5mm, and the outer diameter of the feature part is 3mm.

[0034] According to an embodiment of the present invention, a scanning rod is provided, wherein the length of the tapered rod is less than or equal to 13 mm, and the taper of the tapered rod is 1.8°.

[0035] The digital method for taking a complete impression of the post and core using a scanning rod provided in this invention avoids the problems of reduced accuracy and patient discomfort caused by large-scale impression taking. By matching the digital model of the dentition, the digital model of the dentition and the scanning rod, and the digital impression of the post and core, the post and core data obtained by matching the three are reduced and the accuracy of the post and core is improved. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is one of the flowcharts of a digital method for creating a complete impression of a pile channel using a scanning rod, provided in an embodiment of the present invention.

[0038] Figure 2 This is the second flowchart of the digital method for creating a complete impression of a pile channel using a scanning rod, provided in an embodiment of the present invention.

[0039] Figure 3 This is a schematic diagram of the structure of the initial dentition digital model provided in an embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of the structure of the scanning rod and the digital model of the dental arch provided in an embodiment of the present invention;

[0041] Figure 5 This is a schematic diagram of the structure of the scanning rod and the digital imprint of the pile channel provided in an embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of the method for creating a digital model of a pile channel provided in an embodiment of the present invention;

[0043] Figure 7 This is a three-dimensional structural diagram of the scanning rod provided in an embodiment of the present invention.

[0044] Figure label:

[0045] 10. Pileway; 20. Scanning rod; 21. Clamping part; 22. Feature part; 23. Conical rod; 24. Anti-rotation structure; 25. Plane; 26. Protrusion; 30. Initialized digital model of the dental arch; 40. Scanning rod and digital model of the dental arch; 50. Scanning rod and digital impression of the pileway; 60. Digital model of the pileway. Detailed Implementation

[0046] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0047] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0049] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] The following is combined Figures 1-6 This invention describes a digital method for creating a complete impression of a pile channel using a scanning rod, according to an embodiment of the present invention.

[0052] Figure 1 This example illustrates one of the flowcharts of a digital method for creating a complete impression of a pile channel using a scanning rod, as provided in an embodiment of the present invention. Figure 1 As shown, the digital method for creating a complete impression of the pile channel using a scanning rod includes:

[0053] Step S100: Scan the patient's mouth with an intraoral scanner to obtain an initial dentition digital model 30;

[0054] Step S200: Inject the silicone rubber lightweight material into the root canal post 10 using a syringe, and insert the scanning rod 20 into the root canal post to wait for the impression material to cure, thereby obtaining the post impression.

[0055] Step S300: Scan the affected tooth with the scanning rod 20 and a predetermined number of teeth on both sides of the affected tooth using an intraoral scanner to obtain a digital model 40 of the scanning rod and the dental arch containing the positional relationship between the scanning rod 20 and the dental arch of the affected tooth.

[0056] Step S400: After removing the scanning rod and the pile impression together from the mouth, the scanning rod 20 complete pile impression and feature parts are obtained by the intraoral scanner, resulting in a scanning rod and pile digital impression 50 with the complete shape of the pile 10.

[0057] Step S500: Obtain the digital model 60 of the post track based on the initialized digital model 30 of the dental arch, the digital model 40 of the dental arch and the digital impression 50 of the scanning rod and the post track.

[0058] The digital method for taking a complete impression of the post and core using a scanning rod provided in this embodiment of the invention avoids the problems of reduced accuracy and patient discomfort caused by large-scale impression taking. By initializing the digital model of the dentition 30, the digital model of the dentition 40 with the scanning rod, and the digital impression of the post and core 50 with the scanning rod, the post and core 10 data obtained by matching the three are reduced, and the accuracy of the post and core is improved.

[0059] In an embodiment of the present invention, Figure 3 A schematic diagram illustrating the structure of the initial dentition digitization model provided in an embodiment of the present invention is shown below. Figure 3 As shown, the steps for scanning a patient's mouth using an intraoral scanner include:

[0060] Step S110: Scan the dental arch containing the affected tooth;

[0061] Step S120 involves scanning the dental arch on the opposite side of the affected tooth. The scanning range of the dental arch containing the affected tooth includes the affected tooth and 2-3 teeth on either side of it. The scanning range of the dental arch on the opposite side includes the tooth on the opposite side of the affected tooth, and 2-3 teeth on either side of that tooth. The opposite tooth refers to the tooth position opposite the affected tooth; for example, when the affected tooth is in the maxillary arch, the opposite tooth position is the tooth on the mandibular arch directly below the affected tooth. If the affected tooth is the last posterior tooth, only the affected tooth and 2-3 adjacent teeth need to be scanned, as these 2-3 positions provide sufficient reference for subsequent model registration. Reducing the scanning range compared to existing technologies avoids the accuracy reduction issues caused by large-area impression taking.

[0062] Step S130: Scan the occlusal relationship between the maxillary and mandibular arches.

[0063] In an embodiment of the present invention, prior to the step of injecting the silicone rubber lightweight material into the root canal post 10 using a syringe, the method further includes:

[0064] The scanning rod 20 is tested inside the pile channel 10 to determine the depth of the pile channel 10.

[0065] Specifically, the tapered rod of the scanning rod 20 is inserted into the pile channel 10, and the depth of the pile channel 10 is determined based on the length of the tapered rod entering the pile channel 10. When determining whether the tapered rod has fully entered the pile channel 10, a slight friction sensation from the tapered rod is used as a reference.

[0066] Figure 2 This is a second example of a flowchart illustrating the digital method for creating a complete impression of a pile channel using a scanning rod, as provided in this embodiment of the invention. The following is a detailed explanation in conjunction with... Figure 2 A specific embodiment of this application is described, such as Figure 2 As shown, the digital method for creating a complete impression of the pile channel using a scanning rod includes:

[0067] Step S100: Scan the patient's mouth with an intraoral scanner to obtain an initial dentition digital model 30;

[0068] Step S200: Inject the silicone rubber lightweight material into the root canal post 10 using a syringe, and insert the scanning rod 20 into the root canal post to wait for the impression material to cure, thereby obtaining the post impression.

[0069] Step S300: The scanning rod 20 is tested inside the pile channel 10 to determine the depth of the pile channel 10.

[0070] Step S400: Scan the affected tooth with the scanning rod 20 and a predetermined number of teeth on both sides of the affected tooth using an intraoral scanner to obtain a digital model 40 of the scanning rod and the dental arch containing the positional relationship between the scanning rod 20 and the dental arch of the affected tooth.

[0071] Step S500: After removing the scanning rod and the pile channel impression together from the mouth, the scanning rod 20 complete pile channel impression and feature parts are obtained by the intraoral scanner, resulting in a scanning rod and pile channel digital impression 50 with the complete shape of the pile channel 10.

[0072] Step S600: Obtain the digital model 60 of the post track based on the initialized digital model 30 of the dental arch, the digital model 40 of the dental arch and the digital impression 50 of the scanning rod and the post track.

[0073] In an embodiment of the present invention, after the step of inserting the scanning rod 20 into the root canal post and waiting for the impression material to cure, the method further includes:

[0074] Determine whether the molding compound completely covers the anti-rotation structure;

[0075] If it is determined that the impression material does not completely cover the anti-rotation structure, the impression material is injected again to completely cover the anti-rotation structure, ensuring that the feature portion and adjacent teeth are not covered by the impression material.

[0076] Using a dedicated syringe, inject lightweight silicone rubber into the prepared root canal post 10. Insert the scanning rod 20 into the root canal post 10 and wait for the impression material to cure. To ensure the post impression meets requirements, check whether the impression material completely covers the anti-rotation structure. If the impression material completely covers the anti-rotation structure, no additional impression material is needed. If the impression material does not completely cover the anti-rotation structure, continue to inject a small amount of lightweight silicone rubber into the root canal post 10 using the dedicated syringe. During injection, observe continuously to ensure that the feature area and adjacent teeth are not covered by the impression material.

[0077] In an embodiment of the present invention, Figure 4 A schematic diagram illustrating the structure of the scanning rod and the digital model of the dental arch provided in an embodiment of the present invention is shown below. Figure 4As shown, the scanning rod and the digital model 40 of the dental arch acquired by an intraoral scanner are saved in STL or PLY format. During the scanning process, care must be taken to clearly scan the feature parts of the scanning rod 20. The intended quantity in this application is 2 or 3.

[0078] In an embodiment of the present invention, Figure 5 A schematic diagram illustrating the structure of the scanning rod and the digital imprint of the pile channel provided in an embodiment of the present invention is shown below. Figure 5 As shown, the steps for obtaining a complete impression of the pile path and its features using an intraoral scanner include:

[0079] Step S410: Remove the scanning rod 20 and the post impression together from the oral cavity;

[0080] Step S420: Spray powder onto the surface of the pile impression mold;

[0081] Step S430: The clamping part of the scanning rod 20 is clamped by the clamping member;

[0082] The clamping device is tweezers. Using tweezers can reduce the area obstructed by the clamping part and enhance the clarity after scanning.

[0083] Step S440: Obtain the complete pile impression and feature parts of the scanning rod 20 using an intraoral scanner.

[0084] Because the scanner scans the feature parts of the scanning rod 20 during the scanning process, it avoids scanning the concave structure of the imprint, ensuring the integrity and accuracy of the model scan. The digital imprint 50 of the scanning rod and the pile channel obtained by the intraoral scanner is saved in STL or PLY format.

[0085] Compared to direct digital impression taking, the digital method of the present invention for taking a complete impression of the post and core using a scanning rod not only obtains the positional relationship between the scanning rod 20 and the dental arch, but also obtains the impression of the post and core through the scanning rod 20. The post and core made in this way can make the bonding resin layer thinner and more uniform, reduce the formation of gaps at the bonding interface, improve the fit with the root canal wall, and is expected to achieve better restorative results.

[0086] In an embodiment of the present invention, Figure 6 A schematic diagram illustrating the method for creating a digital model of a pile channel provided in an embodiment of the present invention is shown, such as... Figure 6 As shown, the steps for obtaining the digital model 60 of the post and socket based on the initial dentition digital model 30, the scanning rod and dentition digital model 40, and the scanning rod and post and socket digital impression 50 include:

[0087] Step S510: With the scanning rod and the digital dental model 40 as the target, the adjacent teeth of the affected tooth in the initialized digital dental model 30 are used as the registration area for registration operation;

[0088] Step S520: The scanning rod and the dental arch digital model 40 and the scanning rod and the dental arch digital impression 50 are registered using the feature area of ​​the scanning rod and the post digital impression 50 as the registration area.

[0089] In step S530, the digitized dental arch model 30 with the deleted post 10 data is fused with the digital impression 50 of the scanning rod and post 10 with the deleted scanning rod portion to obtain a digitized post 10 model 60 with post 10 data information and the position information of the affected tooth and its adjacent teeth.

[0090] In addition to obtaining the digital model 60 of the pile channel by the above steps, the data of the scanning rod 20 can also be imported into the intraoral scanner. The scanner software can identify the registration structure and perform automatic identification and automatic registration, thus obtaining the digital model 60 of the pile channel.

[0091] It should be noted that all the above steps were performed in 3D reverse engineering software. The data for pile channel 10 includes the angle, depth, and complete shape of pile channel 10.

[0092] In an embodiment of the present invention, before fusing the initialized dentition digitization model 30 (with the post 10 data deleted) with the digital impression 50 of the scanning rod and post 10 (with the scanning rod portion deleted), the step of obtaining the post 10 digitization model 60 based on the initialized dentition digitization model 30, the digital model 40 of the scanning rod and dentition, and the digital impression 50 of the scanning rod and post 10 further includes:

[0093] The normals of the scanning rod and the digital imprint 50 of the pile channel are flipped.

[0094] By flipping the normals of the scanning rod and the digital imprint 50 of the pile channel, that is, by exchanging the "outer" and "inner" surfaces of the scanning rod and the digital imprint 50 of the pile channel, fusion errors can be avoided during the fusion process, thus improving the accuracy of the digital model 60 of the pile channel.

[0095] The digital method for taking a complete impression of the post and core using a scanning rod provided in this embodiment of the invention avoids the problems of reduced accuracy and patient discomfort caused by large-scale impression taking. By initializing the digital model of the dentition 30, the digital model of the dentition 40 with the scanning rod, and the digital impression of the post and core 50 with the scanning rod, the post and core 10 data obtained by matching the three are reduced, and the accuracy of the post and core is improved.

[0096] The present invention provides a digital method for taking a complete impression of the post and core using a scanning rod. The post and core impression is taken by scanning rod 20. An intraoral scanner scans and registers the scanning rod 20 before and after it is removed from the mouth to obtain the complete shape of the post and core 10 and its accurate position in the dentition. This achieves a high-precision digital impression of the post and core, which can reduce the influence of impression material deformation in traditional methods and the discomfort of patient impression taking. It can also improve the accuracy of post and core restoration fabrication and its fit with the root canal wall.

[0097] Figure 7 A three-dimensional structural schematic diagram of the scanning rod provided in an embodiment of the present invention is illustrated, such as... Figure 7 As shown, the present invention also provides a scanning rod 20, which is used in the digital method for making a complete impression of a pile channel using a scanning rod as described in any of the embodiments above. The scanning rod 20 includes a clamping part 21, a feature part 22 and a tapered rod 23 connected in sequence, and the tapered rod 23 is provided with an anti-rotation structure 24.

[0098] In an embodiment of the present invention, the clamping part 21 is a cylindrical body, and the clamping part 21, the feature part 22, and the tapered rod 23 are integrally formed. The outer peripheral surface of the clamping part is provided with a clamping surface, which is planar. Setting the clamping surface as a planar surface facilitates clamping with tweezers. In this embodiment, the cross-section of the clamping part 21 is rectangular. The feature part 22 is cylindrical, and its outer diameter is larger than that of the clamping part; the outer diameter of the feature part 22 is 3 mm. The height of the feature part 22 is 5 mm. To increase the structural prominence of the feature part 22, two planes 25 are provided on the outer peripheral surface of the feature part 22 near the end of the clamping part 21.

[0099] The two planes 25 are of different sizes. In addition, two protrusions 26 are provided on the outer peripheral surface of the feature part 22 near the clamping part 21. The protrusions 26 are provided along the length direction of the feature part 22, and the outer diameters of the two protrusions 26 are of different sizes, located on both sides of the cylinder 22.

[0100] In embodiments of the present invention, the length of the tapered rod 23 is less than or equal to 13 mm. However, the length of the tapered rod 23 is not limited to this and is determined based on the average root canal length for different tooth positions. The outer diameter of the tapered rod 23 near the feature portion 22 is 0.8 mm, and the taper of the tapered rod 23 is the same as that of the smallest P-drill, which is 1.8°. The anti-rotation structure 24 is cubic and integrally formed with the tapered rod 23. The height of the anti-rotation structure 24 is 1.5 mm, and the length of the tapered rod 23 between the anti-rotation structure 24 and the feature portion 22 is 2 mm, ensuring that the anti-rotation structure 24 does not contact the tooth structure during the trial wear of the scanning rod 20.

[0101] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A digital method for creating a complete impression of a pile channel using a scanning rod, wherein the scanning rod comprises a clamping part, a feature part, and a tapered rod connected in sequence, and the tapered rod is provided with an anti-rotation structure; characterized in that, include: An initial digital model of the dentition is obtained by scanning the patient's mouth with an intraoral scanner. The silicone rubber lightweight material is injected into the root canal channel using a syringe, and the scanning rod is inserted into the root canal channel to wait for the impression material to cure, thus obtaining the impression of the root canal channel. The affected tooth with the scanning rod and a predetermined number of teeth on both sides of the affected tooth are scanned by an intraoral scanner to obtain a digital model of the scanning rod and the dentition containing the positional relationship between the scanning rod and the dentition of the affected tooth. After the scanning rod and the pile impression are removed from the mouth, the complete pile impression and feature parts of the scanning rod are obtained by the intraoral scanner, resulting in a scanning rod and a digital pile impression with a complete pile shape. The digital model of the post is obtained based on the initial dentition digital model, the scanning rod and the dentition digital model, and the scanning rod and the post digital impression.

2. The digital method for creating a complete impression of a pile channel using a scanning rod according to claim 1, characterized in that, The step of scanning the patient's mouth with an intraoral scanner includes: Scan the dental arch containing the affected tooth; The dental arch on the opposite side of the affected tooth is scanned. The scanned area of ​​the dental arch containing the affected tooth includes the affected tooth and 2-3 teeth on either side of the affected tooth. The scanned area of ​​the dental arch on the opposite side of the affected tooth includes the tooth on the opposite side and 2-3 teeth on either side of the tooth on the opposite side. If the affected tooth is the last posterior tooth, only the affected tooth and 2-3 teeth adjacent to it need to be scanned. The occlusal relationship between the maxillary and mandibular arches was scanned.

3. The digital method for creating a complete impression of a pile channel using a scanning rod according to claim 1, characterized in that, Prior to the step of injecting the silicone rubber lightweight material into the root canal via a syringe, the procedure also includes: The scanning rod is tested inside the pile channel to determine the depth of the pile channel.

4. The digital method for creating a complete impression of a pile channel using a scanning rod according to claim 1, characterized in that, After the step of inserting the scanning rod into the root canal and waiting for the impression material to cure, the method further includes: Determine whether the molding compound completely covers the anti-rotation structure; If it is determined that the impression material does not completely cover the anti-rotation structure, the impression material is injected again to completely cover the anti-rotation structure, ensuring that the feature portion and adjacent teeth are not covered by the impression material.

5. The digital method for creating a complete impression of a pile channel using a scanning rod according to claim 1, characterized in that, The step of obtaining a complete impression of the pile path and its features using an intraoral scanner includes: Remove the scanning rod and the impression of the post from the oral cavity together; Powder is sprayed onto the surface of the pile impression mold; The clamping part of the scanning rod is clamped by the clamping member; The complete impression of the pile path and its features are obtained by an intraoral scanner.

6. The digital method for creating a complete impression of a pile channel using a scanning rod according to claim 1, characterized in that, The step of obtaining the digital model of the post and track based on the initialized digital model of the dental arch, the digital model of the dental arch and the digital impression of the scanning rod and the post and track includes: Using the scanning rod and the digital dental arch model as targets, the adjacent teeth of the affected tooth in the initialized digital dental arch model are used as the registration area for registration operation; The scanning rod and the digital dental model are registered with the digital dental model and the digital dental model using the feature area of ​​the digital impression of the dental arch as the registration area. The initial dentition digital model with deleted post data is fused with the digital impression of the scanning rod and post with deleted scanning rod portion to obtain a post digital model with post data information and the position information of the affected tooth and the adjacent teeth of the affected tooth.

7. The digital method for creating a complete impression of a pile channel using a scanning rod according to claim 6, characterized in that, Before fusing the initialized dentition digit model with the deleted post data and the digitized impression of the scan bar and post with the deleted scan bar portion, the method further includes: The normals of the scanning rod and the digital imprint of the pile channel are flipped.

8. The digital method for creating a complete impression of a pile channel using a scanning rod according to claim 1, characterized in that, The outer peripheral surface of the clamping part is provided with a clamping surface, which is a plane. The height of the feature part is 5mm and the outer diameter of the feature part is 3mm.

9. The digital method for creating a complete impression of a pile channel using a scanning rod according to claim 1, characterized in that, The length of the tapered rod is less than or equal to 13 mm, and the taper of the tapered rod is 1.8°.

Images