Preparation method of integrated fiber pile core
Through the preparation method of integrated fiber pile cores, the integrated fiber pile core is designed and milled using digital models and computer design software, the problem of the existing pile core crown repair requires multiple medical treatments, and more efficient dental restoration is achieved.
Patent Information
- Application Number
- CN202411754376.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-03-14
AI Technical Summary
The existing pile core crown repair method requires multiple visits and cannot meet the needs of contemporary people for immediate repair.
The preparation method of integrated fiber pile cores is adopted to reduce the production cycle by obtaining patient oral data, preparing digital models, designing and milling integrated fiber pile cores.
It significantly shortens the preparation time of pile cores, improves the efficiency of tooth restoration, and can meet the needs of contemporary people for immediate repair.
Smart Images
Figure CN119606576A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to denture technology, and in particular to a method for preparing a fiber post and core. Background Art
[0002] Post and core crown restoration is a treatment method used when the tooth defect is severe and the remaining tooth tissue is insufficient to directly support the crown restoration. The post and core crown is to first form a post and core on the residual root or residual crown, and use the post and core to provide support and retention before restoration. The post and core crown is mainly composed of three parts: the post, the core and the crown. A post (also called a "post channel") is inserted into the root canal to stabilize and support the remaining tooth root, then a core is made on the post, and then a crown is put on to improve the shape and function of the tooth.
[0003] The post is the part inserted into the root canal. The crown is connected to the core, and the tail is connected to the root canal sealing area. It uses friction and adhesion to obtain retention with the inner wall of the root canal to prevent force concentration and reduce the risk of transverse fracture of the tooth neck. Posts are divided into metal posts and non-metal posts according to different materials. Metal posts include gold alloys, nickel-chromium alloys, titanium alloys, etc., which have good mechanical properties, high fit, and good retention, but poor aesthetics. Non-metal posts are mainly ceramic posts and fiber posts; ceramic posts are mainly zirconia posts, which have good aesthetics and are mostly used for anterior tooth restoration, but they have high hardness and elastic modulus similar to that of metal, which can easily lead to root fractures; fiber posts currently commonly use quartz fiber and glass fiber posts, which are mainly prefabricated posts, and are mostly bonded with core materials such as resin by resin bonding. They have high aesthetics and are not easy to cause root fractures.
[0004] The core mainly replaces the missing part of the clinical crown, is fixed on the post, and together with the remaining crown tooth tissue forms the final preparation of the full crown. The core provides sufficient retention for the crown, strengthens the resistance of the crown tooth tissue, and provides support for the full crown.
[0005] According to the structure of the restoration, the post-core crown can be divided into a three-body structure of post-core-crown, a two-body structure of post-core-crown, and an integrated structure of post-core-crown. At present, the two-body structure of post-core-crown is widely used. The post and core are an integral structure of the same material, separated from the crown, and suitable for various defects, but the post and core require a certain production cycle. In contemporary society, people's pace of life and work is accelerated, and there is a high urgency for immediate chairside restoration. Conventional restoration of post-core crowns requires multiple visits to the doctor, which obviously can no longer meet the requirements of contemporary people. Summary of the invention
[0006] In view of the above-mentioned shortcomings of the prior art, the main purpose of the present invention is to provide a method for preparing an integrated fiber post and core, so as to reduce the preparation time of the post and core in the process of tooth restoration using a post and core crown.
[0007] In order to achieve the above object, the technical solution of the present invention is: a method for making an integrated fiber post and core, comprising the following steps:
[0008] (1) obtaining oral data of the patient to prepare plaster models of the upper and lower dentition, preparing defect models based on the plaster models of the upper and lower dentition, and using a step-back technique to prepare the root canals, using a cold lateral pressure method to fill the root canals, and preparing the post channel after the root canal filling is completed;
[0009] (2) introducing a light silicone rubber into the root canal to completely cover the root canal opening, taking it out after the silicone rubber solidifies, fixing the silicone rubber post channel impression to the plaster model with tape to ensure that the silicone rubber portion other than the anatomical morphology of the root canal opening is in contact with the plaster model; acquiring a first silicone rubber post channel digital model using a scanner;
[0010] (3) trimming the first silicone rubber pile track digital model using software to obtain a second silicone rubber pile track digital model;
[0011] (4) Scanning the plaster model with a scanner to obtain a digital model of the maxillary and mandibular dentition, merging the second silicone rubber post channel digital model and the maxillary and mandibular dentition digital model to obtain a second digital model of the maxillary and mandibular dentition with a post channel, importing the second digital model of the maxillary and mandibular dentition into a computer design software for post and core design, and then importing the obtained integrated post and core digital model into a CAM device for milling to obtain an integrated fiber post and core.
[0012] Preferably, in step (4), the step of merging the second silicone rubber post channel digital model and the upper and lower jaw dentition digital models comprises:
[0013] The second silicone rubber post channel digital model and the maxillary and mandibular dentition digital models were imported into Geomagic software, and 9 characteristic marking points were selected. All marking points were dispersed as much as possible, and the two digital models were unified into the same global coordinate system. Then, the data of the post channel close to the root canal orifice of the second silicone rubber post channel digital model were cropped and removed, and the data of the middle and lower sections of the post channel overlapping with the maxillary and mandibular dentition digital models were retained as little as possible. The hole defects and uneven parts of the model obtained after cropping were processed.
[0014] Preferably, in step (4), the steps of obtaining the integrated post-core digital model are as follows:
[0015] The computer design software is Dental Designer. When designing the post and core, the gap is set to 0 μm, a first integrated post and core digital model is obtained and saved in STL format, and after returning to the design interface, the gap is set to 80 μm to obtain a second integrated post and core digital model.
[0016] Preferably, in step (2), when covering the root canal opening, a No. 40 H file is inserted as a reinforcing wire.
[0017] Preferably, in step (1), when preparing the post channel after the root canal filling is completed, at least 5 mm of filling material is retained at the root apex.
[0018] Preferably, in step (3), during the trimming process, the excess portion is removed along the edge of the remaining tooth tissue of the abutment tooth, leaving only the remaining tooth morphology around the root canal and the root canal opening.
[0019] Compared with the prior art, the present invention utilizes mathematical models to design and process the fiber post and core, which saves time compared with the traditional preparation method. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The structure of the present invention and its beneficial technical effects are described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] Figure 1 It is a flowchart of the method of the present invention.
[0022] Figure 2 It is a flowchart of the plaster model making process of the present invention.
[0023] Figure 3 It is a flowchart of the digital model acquisition process of the present invention. DETAILED DESCRIPTION
[0024] In order to make the invention purpose, technical solution and beneficial technical effects of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining the present invention, not for limiting the present invention.
[0025] The preparation method of the integrated fiber post and core of this embodiment comprises the following steps:
[0026] 1. Steps for preparing plaster models
[0027] According to the patient's oral data, the upper and lower mandibular dentition plaster models were poured, fixed on the average frame, and the defect model was prepared by transverse truncation 2mm above the ex vivo gingival margin. The root canal was prepared using the step-back technique and the cold lateral pressure method was used for root canal filling. After the root canal filling was completed, the post channel was prepared according to the metal post and core standard, and at least 5mm of the filling material was retained at the root apex.
[0028] 2. Obtaining digital models and designing production steps
[0029] Lightweight silicone rubber was introduced into the root canal to completely cover the root canal orifice. A No. 40 H file was inserted as a reinforcing wire and removed after the silicone rubber solidified. The silicone rubber post channel impression was fixed to the plaster model with tape to ensure that the silicone rubber part other than the anatomical morphology of the root canal orifice was in contact with the plaster model. The silicone rubber post channel model P was acquired by 3Shape scanner and stored in STL format. Model P was trimmed in Geomagic Wrap software, and the excess part was removed along the edge of the remaining tooth tissue of the abutment tooth. Only the remaining tooth morphology around the root canal and the root canal orifice was retained and saved as the post channel digital model PB. The mandibular dentition model DB was scanned by 3Shape scanner. The STL format of the models PB and DB was imported into Geomagic software. According to the "Align-Manual Registration-n Point Registration" command, 9 feature markers were selected. All markers were dispersed as much as possible, and the two digital models were unified into the same global coordinate system. Then, the data of the part of the PB model post channel close to the root canal orifice was cut and removed, and the data of the middle and lower sections of the post channel overlapping with the DB model was retained as little as possible. The cut PB and DB were subjected to the "Boolean operation-merge" command, and the hole defects and uneven parts of the obtained model were processed by "grid doctor", and the mandibular dentition model DB1 with post channel was obtained, which was saved as STL format. The model DB1 was imported into the computer design software Dental Designer for post and core design, and the gap was set to 0μm to obtain the integrated post and core digital model PB1, which was saved in STL format; the design interface was returned and the gap was set to 80μm to obtain the post and core model PB2, which was imported into the CAM equipment for milling to obtain the integrated fiber post and core. The above alignment steps were performed on DB1 and PB1: "alignment-manual registration-n point registration", and after the coordinate system was unified, the "Boolean operation merge" was performed to obtain the preparation digital model DB2, which was finally imported into the computer software for crown design.
[0030] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make appropriate changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.
Claims
1. A method for making an integrated fiber post and core, characterized in that: The following steps are involved: (1) obtaining oral data of the patient to prepare plaster models of the upper and lower dentition, preparing defect models based on the plaster models of the upper and lower dentition, performing root canal preparation, performing root canal filling using the cold lateral pressure method, and preparing post channels after the root canal filling is completed; (2) introducing a light silicone rubber into the root canal to completely cover the root canal opening, taking it out after the silicone rubber solidifies, fixing the silicone rubber post channel impression to the plaster model with tape to ensure that the silicone rubber portion other than the anatomical morphology of the root canal opening is in contact with the plaster model; acquiring a first silicone rubber post channel digital model using a scanner; (3) trimming the first silicone rubber pile channel digital model to obtain a second silicone rubber pile channel digital model; (4) Scanning the plaster model with a scanner to obtain a digital model of the maxillary and mandibular dentition, merging the second silicone rubber post channel digital model and the maxillary and mandibular dentition digital model to obtain a second digital model of the maxillary and mandibular dentition with a post channel, importing the second digital model of the maxillary and mandibular dentition into a computer design software for post and core design, and then importing the obtained integrated post and core digital model into a CAM device for milling to obtain an integrated fiber post and core.
2. The method for making an integrated fiber post and core according to claim 1, characterized in that: In step (4), the step of merging the second silicone rubber post channel digital model and the upper and lower jaw dentition digital models comprises: The second silicone rubber post channel digital model and the maxillary and mandibular dentition digital models were imported into Geomagic software, and 9 characteristic marking points were selected. All marking points were dispersed as much as possible, and the two digital models were unified into the same global coordinate system. Then, the data of the post channel close to the root canal orifice of the second silicone rubber post channel digital model were cropped and removed, and the data of the middle and lower sections of the post channel overlapping with the maxillary and mandibular dentition digital models were retained as little as possible. The hole defects and uneven parts of the model obtained after cropping were processed.
3. The method for making an integrated fiber post and core according to claim 1, characterized in that: In step (4), the steps of obtaining the integrated post-core digital model are as follows: When designing the post and core, the gap was set to 0 μm, and the first integrated post and core digital model was obtained and saved in STL format. After returning to the design interface, the gap was set to 80 μm to obtain the second integrated post and core digital model.
4. The method for making an integrated fiber post and core according to claim 1, characterized in that: In step (2), a No. 40 H file is inserted as a reinforcing wire when covering the root canal orifice.
5. The method for making an integrated fiber post and core according to claim 1, characterized in that: In the step (1), when preparing the post channel after the root canal filling is completed, at least 5 mm of filling material is retained at the root apex.
6. The method for making an integrated fiber post and core according to claim 1, characterized in that: In step (3), during the trimming process, the excess portion is removed along the edge of the remaining tooth tissue of the abutment tooth, leaving only the remaining tooth shape around the root canal and the root canal opening.