Pile-core intraoral scanning column

Abstract

The utility model relates to the technical field of dentistry, in particular to a post-core intraoral scanning column, and aims to overcome the defect that an existing scanning column is difficult to position. The scanning column is used for being inserted into a root canal pile way so that an intraoral scanner can scan a root canal with the scanning column, the scanning column comprises a top and a pile part, the top is fixedly connected with the pile part, and a positioning face is arranged on the top and used for positioning the position of the scanning column in the root canal pile way. Compared with the prior art, the utility model has the advantages that the scanning column in the stake core port is matched with the clinical tooth stake channel, and the positioning surface of the scanning column is used for positioning the scanning column, so as to confirm the position information such as orientation and angle of the scanning column in the stake channel, thereby obtaining the information such as diameter and depth of the stake channel according to the position of the scanning column in the stake channel; and the obtained result is more accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of dentistry, in particular to a post and core intraoral scanning column. Background Art

[0002] Post and core crowns can usually repair teeth that have lost a lot of tooth tissue due to caries or bruxism. According to the different materials, they are divided into fiber posts, metal posts and ceramic posts. According to the different production methods, they can be divided into direct restoration method and indirect restoration method. The direct restoration method is to complete the post and core shaping directly at the chairside, and trim it as a full crown preparation. The direct restoration method is represented by prefabricated fiber posts; while the indirect restoration method requires a fine impression of the post channel to complete the post and core production on the model. The post and core produced by the indirect restoration method is also called a personalized post and core. The personalized post and core is made according to the shape of the post channel of the affected tooth, and has a strong fit with the post channel and good fit.

[0003] An important step in making a personalized post and core is to make an impression of the prepared post channel, then pour plaster into the impression, and finally the technician will make the post and core with reference to the plaster model. Digital impression is a new impression technology that obtains oral impression information through digital technology. It uses digital equipment such as intraoral scanners to obtain oral impression information, and obtains a three-dimensional model of the oral impression through computer processing and analysis. As for the use of digital impressions for root canals, the intraoral scanner has a problem of insufficient depth of field for anterior teeth with long root canals, and the deep data of the post channel cannot be directly obtained, so the accuracy of the produced personalized post and core is low. For posterior teeth with short root canals, due to the narrow diameter of the root canal opening, the light of the intraoral scanner cannot enter the deep part of the posterior tooth root canal, and the data of the posterior tooth root canal cannot be obtained.

[0004] When an intraoral scanner scans a narrow root canal, the light of the intraoral scanner cannot enter due to the shallow depth of field of the intraoral scanner. A patent document entitled A scanning rod and a digital method for making a complete impression of a post channel using the scanning rod (publication number: CN117530793A) is disclosed. This method obtains post channel data by scanning a digital model of a dentition without a scanning rod and a digital model with a scanning rod, and a scanning rod with a post channel impression, respectively. This method can solve the problems existing in scanning the root canal post channel with an existing intraoral scanner. However, this method also requires implanting a silicone rubber light body in the root canal post channel to obtain a post channel impression. Therefore, a scanning column (also called a "scanning rod") is developed specifically for post channel scanning. The size of the scanning column completely matches the prepared post channel. By placing the scanning column in the prepared post channel, the root canal with the scanning column and the root canal without the scanning column are scanned respectively. The software will automatically calculate the position and depth of the post channel, thereby obtaining the data in the root canal.

[0005] In addition, there is a patent document named a post-core scanning rod (authorization announcement number: CN 213430693 U), which is used in the processing plant to cooperate with the tooth model to obtain the post data, reduce the uncertainty factors in the wax-type post-core molding process, and obtain the post data by matching the post-core scanning rod and the tooth model, scanning the matched post-core scanning rod and the tooth model, without spraying the light-shielding material, and can be directly scanned, with fewer processes, fewer errors, and high accuracy of the obtained post data; the scanning process is in an open environment, and the post data is obtained by the post-core scanning rod, and the post data includes the post diameter, the post length and the post inclination angle. However, the complex situation in the mouth, the difficulties in light and position as mentioned above are not taken into account, and the intraoral scanner cannot accurately position the post-core scanning column, so it cannot be used in clinical patients. In clinical practice, silicone rubber molding is still routinely used, and then it is sent to the processing plant for production through mold pouring, and the steps are relatively cumbersome. Summary of the invention

[0006] The utility model aims to overcome the defect that the existing scanning column is difficult to position, and proposes a scanning column in the post and core opening which realizes the positioning of the scanning column through a positioning surface.

[0007] The technical solution of the utility model includes: a post and core intraoral scanning column, the key point of which is that the scanning column is used to be inserted into a root canal post channel for an intraoral scanner to scan the root canal with the scanning column, the scanning column includes a top and a post portion, the top is fixedly connected to the post portion, and a positioning surface is provided on the top, and the positioning surface is used to locate the scanning column in the root canal post channel.

[0008] Furthermore, the positioning surface is an inclined surface arranged on the outer peripheral surface of the top.

[0009] Furthermore, the top is cylindrical in shape, and the diameter and length of the inclined surface are smaller than the top, so that the inclined surface extends from the end surface of the top and to one side to its outer peripheral surface.

[0010] Furthermore, the diameter of the top is 2.8-3.3 mm, the bottom length of the inclined surface is 2.0-2.5 mm, and the height is 1.8-2.5 mm.

[0011] Furthermore, the length of the top portion is greater than 3 mm, and when the scanning column in the post and core mouth is inserted into the tooth post channel, it is ensured that the top portion is exposed outside the post channel.

[0012] Furthermore, the length of the pile portion is 11 to 13 mm.

[0013] Furthermore, the diameter of the pile portion is 0.8-1.9 mm.

[0014] Furthermore, the scanning column is made of any one of zirconium oxide material, metal material and resin material.

[0015] Furthermore, the scanning column is formed by CAD / CAM cutting.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] By matching the post and core intraoral scanning column with the clinical tooth post channel, the scanning column is positioned using the positioning surface of the scanning column to confirm the position information such as the orientation and angle of the scanning column in the post channel, so as to obtain the diameter, depth and other information of the post channel according to the position of the scanning column in the post channel, and the result is more accurate. Secondly, the top of the scanning column is exposed outside the post channel, so when scanning, only the position of the post channel opening needs to be scanned, which solves the problem that the light of the intraoral scanner cannot enter the post channel. It can be used not only for anterior teeth, but also for posterior teeth scanning. Finally, the scanning column has different lengths and diameters, and the specifications of each scanning column are fixed. Different scanning columns can be matched with different post channel heads, which improves the accuracy of scanning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a structural schematic diagram of a scanning column in a post-core opening.

[0019] Figure 2 It is a schematic structural diagram of a post and core intraoral scanning column matching the anterior tooth post channel of the utility model.

[0020] Figure 3 It is a schematic structural diagram of a post and core intraoral scanning column matching the posterior tooth post channel of the utility model.

[0021] Description of labels:

[0022] 1. Scanning column, 10. Top, 11. Post part, 12. Positioning surface, 2. Single root post channel for anterior teeth, 3. Multiple root post channel for posterior teeth, 100 intraoral scanner. DETAILED DESCRIPTION

[0023] The specific scheme of the utility model is further described in detail below in combination with the preferred embodiments and the accompanying drawings.

[0024] like Figure 1 As shown, the utility model discloses a post-core intraoral scanning column 1, as shown Figure 2 As shown, the scanning column 1 can be matched with the post channel 2 of the single root canal of the anterior teeth. By placing the intraoral scanning column of the post and core in the prepared post channel 2, the root canal with the intraoral scanning column 1 of the post and core and the root canal without the intraoral scanning column 1 of the post and core are scanned respectively by using the intraoral scanner 100. The software will automatically calculate the position and depth of the post channel, thereby obtaining the data in the post channel 2 of the single root canal of the anterior teeth.

[0025] like Figure 3As shown, the scanning column 1 can also be matched with the multi-root tube post channel 3 of posterior teeth. By placing the intraoral scanning column of the post and core in the prepared post channel 2, multiple post and core intraoral scanning columns 1 can be inserted into the multi-root tube post channel 3 of posterior teeth for scanning in a single time or in batches. It can be coordinated with the post channels in different situations. The intraoral scanner 100 is used to scan the root canals with the post and core intraoral scanning column 1 and the root canals without the post and core intraoral scanning column 1 respectively. The software will automatically calculate the position and depth of the post channel, thereby obtaining the data in the multi-root tube post channel 3 of posterior teeth.

[0026] It should be noted that the computer software used to scan the root canal with the scanning column and the root canal without the scanning column by using the intraoral scanner 100 and overlap the two scanned images is prior art. The specifications and dimensions of the scanning column are pre-stored in the computer software, and those skilled in the art can replace the scanning column with the impression in the prior art (CN117530793A) with the pre-stored specifications and dimensions of the scanning column to obtain the post channel data, so the software used in the present utility model is prior art.

[0027] like Figure 1 As shown, the scanning column 1 includes an integrally formed top 10 and a post 11, the top 10 is fixed to the top of the post 11, and the top 10 and the post 11 are in line. A positioning surface 12 is provided on the top of the scanning column 1, and the positioning surface 12 is used to locate the position of the scanning column 1 in the root canal post channel, more specifically, to locate the direction and depth of the scanning column 1 in the root canal post channel, so as to obtain the direction and depth of the post channel through the image of the post channel opening and the positioning surface, so as to facilitate the production of an accurate post and core. Figure 2 As shown, when designing the post and core, by matching the positioning surface 12 on the scanning column 1 with the positioning surface 12 on the scanning column 1 inserted into the post channel 2 of the anterior single root canal, the complete structure of the scanning column 1 in the post and core mouth can be accurately fitted, and then the image with the scanning column placed and the image without the scanning column placed are superimposed on each other, so that the diameter and length of the post channel can be automatically calculated. Figure 3 As shown, for the multiple root tube post channels 3 of the posterior teeth, multiple scanning columns 1 can be inserted respectively, and then the positioning surface 12 is matched, and the computer will automatically fit the multiple complete scanning columns 1, and the images with the scanning columns 1 placed and the images without the scanning columns 1 placed are superimposed on each other, and the diameters and lengths of the multiple post channels are automatically calculated, and then a complete post and core are formed.

[0028] like Figures 1 to 3As shown, the length of the top 10 is greater than 3 mm, preferably 4 mm in this example, so that when the scanning column in the post and core is inserted into the tooth post channel, the top is ensured to be exposed outside the post channel. The diameter is 2.8 to 3.3 mm, preferably 3 mm in this example. The shape of the top 10 is cylindrical, and in other embodiments it can also be spherical or hemispherical, or other shapes that are convenient for setting the positioning surface, such as a column or cone with a square or triangular cross section. The positioning surface 12 is an inclined surface set on the outer peripheral surface of the top 10. For the cylindrical top 10, the diameter and length of the inclined surface are both smaller than the top 10, so that the inclined surface extends from the end face of the top 10 and to one side to its outer peripheral surface, and the inclined surface shape formed is a triangle-like shape in which one side is a straight line and the other two sides are arc-shaped. The intersection of the two arcuate edges forms a vertex, which is used to facilitate the positioning of the positioning surface. The bottom length of the inclined surface is 2.0-2.5 mm, preferably 2.2 mm in this example, and the height of the inclined surface is 1.8-2.5 mm, preferably 2 mm in this example, where the height of the inclined surface is the vertical distance from the bottom of the inclined surface to the vertex. For a spherical or hemispherical top, the positioning surface 12 is a slope with arcuate edges; for a top 10 with a cylindrical or cone shape with a square or triangular cross section, the positioning surface 12 formed is a triangle.

[0029] The radial dimension of the top 10 is greater than that of the post 11, and the radial dimension of the top 10 is less than the width of a tooth. The scanning column 1 in the post and core mouth matches with the anterior teeth single root tube post channel 2, that is, when the scanning column 1 in the post and core mouth is inserted into the anterior teeth single root tube post channel 2, the top 10 is exposed outside the anterior teeth single root tube post channel 2.

[0030] The shape of the pile portion 11 is based on different pile drill bits. The shape of the pile portion 11 can be cylindrical or conical. The cross-sectional shape of the cylindrical or conical shape can be any shape such as circular, triangular, rectangular, etc. Figure 1 The pile section 11 is shown as a conical shape. The pile sections formed by different pile section drill bits have different shapes, and the pile section shapes match the shapes of the drill bits. According to the different pile section drill bits, the scanning column 1 with different pile section 11 shapes is selected.

[0031] For the pile channels drilled by the same type of pile channel drill, only the partial structures that can be scanned by the intraoral scanner at the root canal orifice are different, and the diameter and shape of the pile channels at the deeper position where the light of the intraoral scanner cannot enter are the same. Therefore, after inserting the scanning column 1 corresponding to the drill bit specification type, it is only necessary to scan the structure at the root canal orifice and then combine it with the structure of the pile part 11 inserted into the root canal pile channel 2 to obtain the complete pile channel structure. Therefore, the utility model does not need a mold to obtain the pile data, and only needs to select a scanning column 1 that matches the pile channel drill bit, which reduces the mold operation, simplifies the process of obtaining the installation data, and reduces the problem of inaccurate installation data caused by the change of the mold, thereby improving the matching degree between the post core and the pile channel.

[0032] When the post and core intraoral scanning column 1 is inserted into the anterior teeth single root tube post channel 2, the portion of the post portion 11 connected to the top 10 is exposed outside the anterior teeth single root tube post channel 2, and the remaining portion is inserted into the anterior teeth single root tube post channel 2. The total length L of the post portion 11 ranges from 11 to 13 mm, and is further preferably 12 mm. The total length L of the post portion 11 is designed based on the length of the tooth root in the human oral cavity. The post and core intraoral scanning column 1 with a total length L of 12 mm can meet the restoration needs of most people, and a deviation of 1 mm above and below can cover more than 90% of the population. The diameter R of the post portion 11 ranges from 0.80 to 1.9 mm. The diameter R of the post portion 11 is designed based on the diameters of different post channel drill bits. The post and core intraoral scanning column 1 with a diameter R of 0.80 to 1.9 mm can meet the restoration needs of most people. By manufacturing the post and core intraoral scanning column 1 with different post portion 11 lengths L, diameters R and shapes, it can be matched with post channels in different situations, thereby obtaining corresponding post data, designing different personalized post and cores, and manufacturing personalized post and core matching the oral tooth post channel.

[0033] When the post and core intraoral scanning cylinder 1 is inserted into the posterior teeth multi-root tube post channel 3, the portion where the post portion 11 is connected to the top portion 10 is exposed outside the posterior teeth multi-root tube post channel 3, and the remaining portion is inserted into the posterior teeth multi-root tube post channel 3. The multi-root post and core intraoral scanning cylinder 1 can be inserted into the posterior teeth multi-root tube post channel 3 once or in batches and then scanned using the intraoral scanner 100, which can be matched with the post channels in different situations to obtain corresponding post data, design different personalized post and core, and manufacture personalized post and core matching the oral teeth post channel, thereby solving the problem of high sensitivity of the posterior teeth multi-root tube post channel impression making technology.

[0034] The post portion 11 and the top portion 10 are made of resin material. Preferably, the post portion 11 and the top portion 10 are made of acrylic resin material. The post-core scanning column 1 made of this material does not reflect light when scanned by a scanner, and does not need to be sprayed with a sunscreen. In addition, the post-core scanning column 1 made of this material is not easily deformed, is easy to store, and can be reused.

[0035] The post-core scanning column 1 is manufactured by 3D printing, which is convenient and fast to manufacture, and the post-core scanning column 1 manufactured by 3D printing has excellent quality. In addition to 3D printing, the scanning column 1 can also be formed by CAD / CAM cutting. Compared with the 3D printing manufacturing method, which is prone to polymerization shrinkage, the CAD / CAM manufacturing method can effectively avoid polymerization shrinkage during the manufacturing process of the scanning column.

[0036] The post-core intraoral scanning column 1 may also be made of ceramics such as zirconia, metal, resin, and other materials.

[0037] The method of obtaining the post data by scanning the post column 1 in the post and core mouth is as follows: the post data includes the post diameter and the post length. When the scanning column 1 is used for the anterior teeth, such as Figure 2As shown, the post and core intraoral scanning column 1 matched with the anterior teeth single root tube post channel 2 is inserted into the anterior teeth single root tube post channel 2, and the matched post and core intraoral scanning column 1 and the anterior teeth single root tube post channel 2 are scanned by using the intraoral scanner 100; wherein, the post diameter is equal to the diameter R of the post portion 11 of the post and core intraoral scanning column 1 matched with the anterior teeth single root tube post channel 2; the post length is equal to the total length L of the post portion 11 of the post and core intraoral scanning column 1 matched with the anterior teeth single root tube post channel 2 minus the length L1 of the post portion 11 exposed outside the anterior teeth single root tube post channel 2.

[0038] When scanning column 1 is used for posterior teeth, Figure 3 As shown, the post and core intraoral scanning column 1 matched with the posterior teeth multi-root tube and post channel 3 is inserted into the posterior teeth multi-root tube and post channel 3, and the matched post and core intraoral scanning column 1 and the posterior teeth multi-root tube and post channel 3 are scanned by using the intraoral scanner 100; wherein, the post diameter is equal to the diameter R of the post portion 11 of the post and core intraoral scanning column 1 matched with the posterior teeth multi-root tube and post channel 3; the post length is equal to the total length L of the post portion 11 of the post and core intraoral scanning column 1 matched with the posterior teeth multi-root tube and post channel 3 minus the length L1 of the post portion 11 exposed outside the posterior teeth multi-root tube and post channel 3.

[0039] The beneficial effects of the utility model are:

[0040] The purpose of the utility model is to overcome the problem that the depth of field of the intraoral scanner is insufficient and the deep narrow root canal cannot be scanned. It can be applied in clinical work. There is no need to use plaster to perfuse the model. Computer-aided design software can be directly used for design, which saves a lot of work and shortens the time of making the post and core. The designed post and core can be directly cut by computer-aided production equipment, and the uncertainty factors of making the post and core by hand wax model are also avoided. In addition, the utility model adds a positioning surface 12, which can accurately fit the scanning column and the intraoral scanning data during design, and directly obtain the post channel data. At the same time, the utility model can scan the trumpet-shaped oral root canal with the intraoral scanner, and at the same time, the scanning column auxiliary image superposition technology is applied. By placing the scanning column in the prepared post channel, the root canal with the scanning column and the root canal without the scanning column are scanned respectively, and the position and depth of the post channel are obtained. The image of the scanning column and the image of the scanning column are superimposed on each other, so as to obtain the data in the post channel. The post and core intraoral scanning column and the post channel are matched, and the root canal with the post and core intraoral scanning column 1 and the root canal without the post and core intraoral scanning column are scanned respectively to obtain the data of the post channel. There is no need to spray shading materials, and scanning can be done directly, with fewer processes, fewer errors, and high accuracy of the pile data obtained. The pile portion of the scanning column in the pile core mouth of the utility model has different lengths, diameters and end shapes, which can be matched with different pile channel drill bits, and is easy to store and reused, saving time and materials.

[0041] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A post-core intraoral scanning column, characterized in that: The scanning column is used to be inserted into a root canal post channel so that an intraoral scanner can scan a root canal with the scanning column. The scanning column includes a top and a post portion, the top is fixedly connected to the post portion, and a positioning surface is provided on the top, and the positioning surface is used to position the scanning column in the root canal post channel.

2. The post-core intraoral scanning column according to claim 1, characterized in that: The positioning surface is an inclined surface arranged on the outer peripheral surface of the top.

3. The post-core intraoral scanning column according to claim 2, characterized in that: The top is cylindrical in shape, and the diameter and length of the inclined surface are smaller than the top, so that the inclined surface extends from the end surface of the top and to one side to the outer peripheral surface thereof.

4. The post-core intraoral scanning column according to claim 3, characterized in that: The diameter of the top is 2.8-3.3 mm, the bottom length of the slope is 2.0-2.5 mm, and the height is 1.8-2.5 mm.

5. The post-core intraoral scanning column according to claim 1, characterized in that: The length of the top portion is greater than 3 mm, and when the scanning column in the post and core mouth is inserted into the tooth post channel, it is ensured that the top portion is exposed outside the post channel.

6. The post-core intraoral scanning column according to claim 1, characterized in that: The length of the pile portion is 11 to 13 mm.

7. The post-core intraoral scanning column according to claim 1, characterized in that: The diameter of the pile portion is 0.8-1.9 mm.

8. The post-core intraoral scanning column according to claim 1, characterized in that: The scanning column is made of any one of zirconium oxide material, metal material and resin material.

9. The post-core intraoral scanning column according to claim 1, characterized in that: The scanning column is formed by CAD / CAM cutting.

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