CN111568580A - Preparation method of planting fixed bridge restoration model - Google Patents
Preparation method of planting fixed bridge restoration model Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0004—Computer-assisted sizing or machining of dental prostheses
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0006—Production methods
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/34—Making or working of models, e.g. preliminary castings, trial dentures; Dowel pins [4]
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Abstract
The invention relates to a preparation method of a fixed bridge implantation repair model, which comprises the following steps: acquiring a three-dimensional model of a patient's tooth jaw, designing the model by computer, processing data of a dental crown fixing bridge, processing by a selective laser melting technology, and cleaning and polishing a repair model; the preparation method of the model provided by the invention has the advantages of one-time molding of complex parts, short processing period, high material utilization rate, good mechanical property of the parts and high individuation degree.
Description
Technical Field
The invention belongs to the technical field of oral implantology, and particularly relates to a preparation method of a fixed-bridge implantation restoration model.
Background
The false tooth is a prosthesis for repairing one or more missing teeth in a dentition, and is connected with abutments or implants prepared on two sides of the missing teeth by a binder or a fixing device, so as to restore the anatomical form and physiological function of the missing teeth. The fixing false tooth is composed of a fixing body, a bridge body and a connector respectively, wherein the fixing body is a structure fixed on an abutment and comprises a full crown, a pile core crown, a partial crown, an inlay, a wing plate fixing bridge and the like, and is connected with the abutment by virtue of a fixing force to obtain fixing; the bridge body is connected with the abutment by the retention of the retainer and transmits the occlusal force to the abutment through the retainer, and the retainer has good retention force and resistance; the bridge body, namely the artificial tooth, is a part of the fixed bridge for recovering the shape and the function of the lost tooth; the connecting body is a connecting part between the bridge body and the retainer and can be divided into fixed connection and non-fixed connection according to different connecting modes.
The current clinical fixing and repairing steps are that a dentist sets up a treatment scheme through diagnosis, prepares a tooth body according to experience, namely a preparation body, removes a gum and takes an impression, makes a temporary crown, sends the impression to a mechanic center, the mechanic pours a plaster model, repairs the model, fixes the model by a frame, makes a wax-type inner crown, embeds, casts or collects three-dimensional data of the model by a 3D scanner, CAD/CAM makes, polishes after obtaining the inner crown, coats a color masking layer, coats porcelain, repairs the model, glazes, and finally sends the model back to the clinical dentist to bond the restoration body on the prepared abutment.
The main processing mode of the traditional oral metal prosthesis is an investment lost wax casting technology, but the processing process is complicated and consumes long time, and the problems of great error, incomplete casting, sand sticking on the surface and the like of the prosthesis precision and quality can often occur due to different operators, so that the false tooth has long processing period, high labor cost and good and uneven quality, and the current high-performance and automatic and quick prosthesis manufacturing requirements cannot be met.
Disclosure of Invention
The invention aims to solve the problems in the background technology, and provides a preparation method of a repair model of an implantation fixed bridge, which has the advantages of one-step molding of complex parts, short processing period, high material utilization rate, good mechanical property of parts and high degree of individuation.
The purpose of the invention is realized as follows:
a preparation method of a fixed-bridge implantation repair model comprises the following steps:
s1, obtaining a three-dimensional model of the jaw of the patient: carrying out scanning continuous transverse ultrathin scanning on the maxillary dental model, the mandibular dental model and the abutment model by a spiral CT scanner to obtain dental point cloud data, automatically matching according to the occlusion relation by using 3Shape software, converting into an STL format, and storing for CAD software;
s2, computer aided design model: importing STL-format patient upper jaw and lower jaw model data in S1 into CAD software, designing a patient front inner crown model in the CAD software according to the addition of a neck margin line, crown parameters and a lingual side reinforcing rod, and storing an STL-format in the CAD software according to a retainer base gum line, crown parameters and a designed rear tooth fixed bridge model of a connecting body;
s3, processing data of the dental crown fixing bridge: loading STL format maxillary anterior crown and maxillary posterior fixed bridge models of CAD software in S2 into rapid prototyping software Magics15.01, carrying out triangular plate refining repair on part models in the Magics software, adjusting model space placement positions, adding a support structure and layering a discrete model to obtain layer profile information, storing the layer profile information as CLI format data, importing the stored CLI format data into rapid prototyping RP software, setting a supported scanning strategy mode as profile scanning, setting a part scanning mode as S-type orthogonal stacking fault + rear edge-pointing scanning and storing the part as PLT format;
s4, processing by a selective laser melting technology: importing the PLT format file processed in the S3 into a unmetal-100 forming machine, and processing the formed material in the forming machine by adopting an S-shaped orthogonal stacking fault + after-edge-hooking scanning strategy to perform selective laser melting technology to obtain a model entity;
s5, repairing the model, cleaning and polishing: and taking the part and the support down from the substrate by adopting a linear cutting mode, removing the support, and carrying out grinding, polishing, trying-on, polishing of a polished surface, sand blasting of a cemented surface, pre-oxidation and porcelain glazing on the dental crown fixing bridge to obtain a personalized dental crown fixing bridge prosthesis finished product.
Preferably, in S1, the scan parameters of the helical CT scanner are set to 1mm pitch, 2mm layer thickness and 0.1-0.2mm spacing.
Preferably, in S3, triangular piece thinning and repairing are performed on the part model in Magics software, surface thinning and smoothing are performed on the maxillary anterior inner crown and maxillary posterior fixed bridge model, and the modified geometric error value is 0.005.
Preferably, in S3, the space position of the component is adjusted by using the rotation command in Magics software, so that the inner surface of the dental crown faces upward and the outer surface of the dental crown faces downward, and after the space position adjustment of each of the maxillary anterior inner crown, the maxillary anterior fixed bridge and the maxillary posterior fixed bridge is completed, the forming and placing positions of the dental crown fixed bridges are reasonably arranged, so that the crown bridge arrangement direction of the maxillary posterior fixed bridge and the X/Y scanning direction form 45 °.
Preferably, in S4, the molding material is cobalt-chromium alloy powder, and the particle size of the cobalt-chromium alloy powder is 25.8-34.5 μm.
Preferably, in S5, the parts and the support are removed from the base plate by wire cutting, the support structure is manually removed, the outer surface of the cobalt-chromium alloy crown fixing bridge is ground and cut by an alunite lathe needle, and then the grinding and polishing processes are sequentially performed to obtain a prosthesis with a smooth surface, and then the fitting adjustment is performed on the dental model.
Preferably, the dental model is adjusted properly, the external surface of the crown fixing bridge is polished by a rubber polishing wheel, attachments and oxides on the internal surface and the external surface are cleaned by an ultrasonic cleaner, and the surface is cleaned by 80-mesh alumina at 2 × 105-4×105And carrying out sand blasting under the pressure Pa to form a micro coarsening surface, and carrying out ultrasonic cleaning again.
Preferably, after the clean oil-free cobalt-chromium alloy base crown is obtained through ultrasonic cleaning, the base crown is placed into a porcelain oven to be subjected to degassing preoxidation treatment, the impurity gas is removed, and the outer surface of the base crown is sequentially coated with and fused with opaque color-shading base porcelain, dentin porcelain and enamel porcelain to obtain the personalized dental crown fixed bridge prosthesis finished product.
Preferably, in S3, the supporting structure uses a cross-shaped support to complete the forming of the dental crown fixing bridge prosthesis part, the supporting surface angle is 60 °, the supporting filling distance X-axis filling is 1.0mm, the Y-axis filling is 1.0mm, the arrangement angle is 60 °, the supporting upper tooth height is 2mm, the tooth top width is 0.4mm, the tooth root width is 0.7mm, the tooth space is 0.2mm, the supporting lower tooth height is 1mm, the tooth top width is 0.5mm, the tooth root width is 0.8mm, the tooth space is 0.2mm, the supporting offset is 0.005mm, and a cross-shaped support with a small upper tooth and a large lower tooth is generated.
Preferably, in S4, the laser power P =160W for the nominal-100 former, and the filling and edge-hooking scanning speed vs=vg=400mm/S, scanning spacing S =0.08mm, scanning layer thickness H =0.025mm, spot compensation dc1=35μm、dc2=70μm。
Preferably, the cobalt-chromium alloy comprises Co, Cr, Mo, Ni, W, Si, Mn, Fe and C, the content of Co is 40-80%, the content of Cr is 20-28%, and the total content of Co, Cr and Ni is more than or equal to 85%.
Preferably, the cobalt-chromium alloy model processed and molded by the selective laser melting technology has the elastic modulus of 980-1005MPa, the tensile strength of 1100-1283.6MPa, the yield strength of 1003-1015MPa and the elongation of 4.9-5%.
Preferably, the relative density rho of the cobalt-chromium alloy model processed and formed by the selective laser melting technology satisfies the following requirements:
ρ=（Ma×ρh）/（Mw-Mh）×ρ0×100%，
wherein M isaAverage weight of the model in air, MhThe average weight in water after wax sealing of the model, MwAverage weight in air, ρ, after wax sealing of the modelhDensity of distilled water (. rho.82 g/ml)0The theoretical density of the molding material is (8.57 g/cm)3)。
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a method for preparing a repair model of an implantation fixed bridge, which integrates a laser technology, a digital intelligent control technology, a computer aided design analysis and a rapid forming, a designed three-dimensional model is dispersed into two-dimensional outline information layer by layer, laser beams are controlled to scan and melt metal powder, scanning melting channels are mutually overlapped to form a surface, all the surfaces are stacked to form a three-dimensional metal part, a laser selective melting technology combines CAD and laser rapid forming, thereby realizing precise manufacturing, the CAD is responsible for establishing a three-dimensional model of a target part on a computer and dispersing the three-dimensional model into a series of two-dimensional sections, and a scanning path of a laser is planned according to the outline information of each two-dimensional section, a laser rapid forming system is responsible for selectively melting the metal powder layer by layer according to the scanning path planned by the CAD, thereby manufacturing a three-dimensional entity consistent with the model, the method has the advantages of one-step molding of complex parts, short processing period, high material utilization rate, good mechanical property of the parts and high degree of individuation.
2. The method for preparing the fixed bridge implant restoration model is a quick and convenient modeling method by establishing the three-dimensional finite element model based on the CT scanning technology and the computer three-dimensional reconstruction technology, the established three-dimensional finite element model has good physiological form, the structures of all parts are clear, the geometric similarity with the real solid structure is good, and the solid state of the jaw bone can be simulated accurately.
Drawings
FIG. 1 is a flow chart of a method for preparing a repair model of an implant fixation bridge according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1
With reference to fig. 1, a method for preparing a repair model of a fixed-bridge implant includes the following steps:
s1, obtaining a three-dimensional model of the jaw of the patient: carrying out scanning continuous transverse ultrathin scanning on the maxillary dental model, the mandibular dental model and the abutment model by a spiral CT scanner to obtain dental point cloud data, automatically matching according to the occlusion relation by using 3Shape software, converting into an STL format, and storing for CAD software;
s2, computer aided design model: importing STL-format patient upper jaw and lower jaw model data in S1 into CAD software, designing a patient front inner crown model in the CAD software according to the addition of a neck margin line, crown parameters and a lingual side reinforcing rod, and storing an STL-format in the CAD software according to a retainer base gum line, crown parameters and a designed rear tooth fixed bridge model of a connecting body;
s3, processing data of the dental crown fixing bridge: loading STL format maxillary anterior crown and maxillary posterior fixed bridge models of CAD software in S2 into rapid prototyping software Magics15.01, carrying out triangular plate refining repair on part models in the Magics software, adjusting model space placement positions, adding a support structure and layering a discrete model to obtain layer profile information, storing the layer profile information as CLI format data, importing the stored CLI format data into rapid prototyping RP software, setting a supported scanning strategy mode as profile scanning, setting a part scanning mode as S-type orthogonal stacking fault + rear edge-pointing scanning and storing the part as PLT format;
s4, processing by a selective laser melting technology: importing the PLT format file processed in the S3 into a unmetal-100 forming machine, and processing the formed material in the forming machine by adopting an S-shaped orthogonal stacking fault + after-edge-hooking scanning strategy to perform selective laser melting technology to obtain a model entity;
s5, repairing the model, cleaning and polishing: and taking the part and the support down from the substrate by adopting a linear cutting mode, removing the support, and carrying out grinding, polishing, trying-on, polishing of a polished surface, sand blasting of a cemented surface, pre-oxidation and porcelain glazing on the dental crown fixing bridge to obtain a personalized dental crown fixing bridge prosthesis finished product.
Example 2
A method for preparing a repairing model of a fixed-bridge implant comprises performing continuous transverse ultrathin scanning from the lower edge of the chin to the bottom of the nasal bone by adopting a U.S. PQ6000 type spiral CT scanner with the scanning parameters of thread pitch of 1mm, layer thickness of 2mm and interval of 0.1-0.2 mm.
Build the computer in the spiral CT scanner and another microcomputer to form a local area network, upload the two-dimensional CT image in the spiral CT scanner to the microcomputer through FPT file transmission format, and rely on adjusting the CT scanner contrast, brightness, etc. parameters to obtain the two-dimensional CT image with enhanced effect, and finally store it in BMP image file format.
Reading two-dimensional CT image data files at intervals of 0.5-1mm through image synthesis software, performing edge extraction on a two-dimensional image through a gray segmentation method, performing three-dimensional reconstruction on the intercepted two-dimensional CT image by using a three-dimensional surface reconstruction algorithm to obtain rotatable, split, perspective and intercepted three-dimensional model dental point cloud data, performing automatic matching according to a meshing relationship by using 3Shape software, converting the data into an STL format, and storing the data for CAD design.
Entering a CAD design interface, importing a patient upper jaw CAD model, clicking an abutment neck edge by means of a 2D cross-sectional view, editing a correct neck edge line, setting an adhesion gap to be 0.03mm, an additional adhesion gap to be 0.06mm, a distance to the edge line to be 1mm, a smooth distance to be 0.2mm, a design edge line offset to be 0.1mm, a compensation angle to be 65 degrees, an extension compensation to be 0.2mm, and an inner crown wall thickness to be 0.4mm, clicking the tongue side edge of an inner crown, adding a tongue side reinforcing rod control point, setting a reinforcing rod height to be 1mm, and a reinforcing rod angle to be 75 degrees, performing material adding/reducing and smooth operation on the inner crown by adopting a free modeling tool, enabling the inner crown wall thickness to be uniform and the surface to be smooth, integrating and designing all parts of a file, and storing front tooth inner crown data files in an STL.
Introducing STL-format CAD models of upper jaw and lower jaw of patient, determining gum line of abutment of retainer, setting parameters such as adhesion gap and boundary of retainer, adjusting the shapes of abutment and missing tooth such as bite head, ridge, adjacent surface and gum gap according to the relationship between bite and adjacent tooth, setting the inner crown thickness of shape to be 0.4mm and the back cutting amount to be 0.8mm, trimming to make the inner crown surface smooth and make the upper and lower surfaces of bridge have no sharp corner, and setting the minimum cross-sectional area of connector to be 9mm2Freely designing the shape and position of the connector to make it have no large red filmAnd the weak area ensures the connection strength and stores the data file of the posterior tooth fixed bridge in the STL format.
Example 3
On the basis of embodiment 2, STL format maxillary anterior crown and maxillary posterior fixed bridge models designed by CAD software are loaded into rapid prototyping software Magics15.01 for surface refinement and smoothing, the geometric error value is modified to be 0.005, an optimized model with a smooth surface is obtained, the spatial position of a part is adjusted by a rotation command in the Magics software, the inner surface and the outer surface of the dental crown are placed upwards, meanwhile, the modeling time is saved for reducing the support addition, the steps are repeated to complete the spatial position adjustment of each maxillary anterior crown, maxillary anterior fixed bridge and maxillary posterior fixed bridge, the modeling and placing positions of the dental crown fixed bridges are reasonably arranged, the crown bridge arrangement direction and the X/Y scanning direction of the maxillary posterior fixed bridge form 45 degrees, the scanning line length of the bridge body part can be shortened, and the risk of buckling deformation and support cracking of the dental crown fixed bridge is reduced.
The method comprises the steps of selecting cross block supports to complete the forming of dental crown fixing bridge and other prosthesis parts, wherein the angle of a support surface is 60 degrees, the support filling distance is 1.0mm on an X axis, 1.0mm on a Y axis, 60 degrees on an arrangement angle, the height of an upper support tooth is 2mm, the width of the tooth top is 0.4mm, the width of the tooth root is 0.7mm, the space between teeth is 0.2mm, the height of a lower support tooth is 1mm, the width of the tooth top is 0.5mm, the width of the tooth root is 0.8mm, the space between teeth is 0.2mm, and the support offset is 0.005mm, so that the cross block supports with small upper teeth and large lower teeth are generated, not only can be ensured to have enough binding force with a substrate in the forming process, but also can be ensured to cover all overhanging surfaces and be beneficial to be removed after forming, the layering processing is to, meanwhile, the compensation value of an internal filling light spot of the dental crown fixing bridge part is set to be 0.095mm, and the compensation value of a pointing edge light spot is set to be 0.035mm, so that a part entity and a supporting slice file in a cli format are obtained respectively. And sequentially importing the support and the dental crown fixed bridge part slice files into path planning RP software, setting the scanning strategy modes of the support as contour scanning and the scanning mode of the part as S-shaped orthogonal stacking fault + rear edge hooking scanning, wherein the scanning intervals are all 0.08 mm.
Plt format to be processedImporting the file into a nominal-100 forming machine, performing SLM forming processing by adopting an S-shaped orthogonal stacking fault + rear edge hooking scanning strategy and the following process parameters, wherein the laser power P =160W, and the filling and edge hooking scanning speed vs=vg=400mm/S, scanning spacing S =0.08mm, scanning layer thickness H =0.025mm, spot compensation dc1=35μm、dc2=70 μm, good molding of parts and supports, bright surface, no defects of slag adhering, warping deformation and the like, and achieves the expected molding effect.
Firstly, taking down the parts and the support from the substrate by adopting a linear cutting mode, manually removing the support structure, then using a special alunite lathe needle to grind and cut the outer surface of the cobalt-chromium alloy dental crown fixing bridge, and sequentially carrying out grinding and polishing treatment, wherein the precise inner surface is the premise of ensuring the complete in-place and edge sealing of the prosthesis, the grinding treatment is not generally carried out, and after the prosthesis with a smooth surface is obtained, trial wearing adjustment is carried out on the dental model.
After the proper trial adjustment, the external surface of the crown fixing bridge is polished by using a rubber polishing wheel, then the attachments and oxides on the internal surface and the external surface are cleaned by using an ultrasonic cleaner, and in order to improve the bonding strength and the sealing performance of the internal surface and enhance the mechanical bonding force of the metal porcelain on the external surface, 80-mesh aluminum oxide is used at 2 × 105-4×105Carrying out sand blasting under Pa pressure to form a microcosmic coarsened surface, carrying out ultrasonic cleaning again to obtain a clean oil-free cobalt-chromium alloy base crown, putting the base crown into a porcelain oven to carry out degassing preoxidation treatment, removing impurity gas to prevent bubbles from being generated and forming a uniform compact oxidation film, and sequentially coating and fusing opaque color-shading base porcelain, dentin porcelain (body porcelain, transparent porcelain) and enamel porcelain to obtain a personalized dental crown fixed bridge prosthesis finished product with good wearing effect.
Example 4
The cobalt-base alloy mainly comprises Co, Cr, Mo, Ni, W, Si, Mn, Fe and a certain amount of C, wherein the Co is a main element accounting for 40-80% and capable of providing corrosion resistance and strong hardness of the alloy, the Cr is a secondary element accounting for 10-28%, the melting point of the alloy can be reduced and the corrosion resistance can be improved by adding the Co, Cr and Ni, and the total content of the Co, Cr and Ni is not lower than 85% so as to ensure the passivation of a chromium oxide film, reduce the ion precipitation amount of the alloy in an oral environment and avoid potential harm to a human body.
Before laser scanning is carried out, a forming substrate and a powder spreading device are placed at first, so that a reasonable height difference is formed between a powder plane and a substrate plane, the substrate plane is covered with a layer of powder with uniform thickness, and then a laser is controlled to selectively melt first layer section information of a CAD model called by a computer, so that a first layer two-dimensional section is obtained. And then the substrate descends by the thickness of a powder layer, the powder feeding cylinder ascends by a certain height, a layer of powder with uniform thickness is covered on the substrate by the powder spreading brush, the laser beam is guided to move by the scanning galvanometer, the powder layer is selectively melted again to generate a next two-dimensional section on the basis of the previous section, and the steps are repeated to form the whole three-dimensional entity in a layer-by-layer stacking mode.
Example 5
Laser power P =160W of Demetal-100 forming machine, filling and edge-hooking scanning speed vs=vg=400mm/S, scanning spacing S =0.08mm, scanning layer thickness H =0.025mm, spot compensation dc1=35μm、dc2=70 μm, the scanning strategy is an S-type orthogonal stacking fault, and the relative density ρ of the cobalt-chromium alloy model formed by the selective laser melting technique satisfies the following requirements by selecting the laser power P, the scanning speed v and the scanning distance S3 as variable parameters: ρ = (M)a×ρh）/（Mw-Mh）×ρ0× 100% where M isaAverage weight of the model in air, MhThe average weight in water after wax sealing of the model, MwAverage weight in air, ρ, after wax sealing of the modelhDensity of distilled water (. rho.82 g/ml)0The theoretical density of the molding material is (8.57 g/cm)3)。
The compactness is 99.34 percent, and the roughness R of the upper surfaceas11.03 μm, side surface roughness RacIt was 14.43 μm.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents and substitutions made within the scope of the present invention should be included.
Claims (8)
1. A preparation method of a fixed bridge implantation repair model is characterized by comprising the following steps: the method comprises the following steps:
s1, obtaining a three-dimensional model of the jaw of the patient: carrying out scanning continuous transverse ultrathin scanning on the maxillary dental model, the mandibular dental model and the abutment model by a spiral CT scanner to obtain dental point cloud data, automatically matching according to the occlusion relation by using 3Shape software, converting into an STL format, and storing for CAD software;
s2, computer aided design model: importing STL-format patient upper jaw and lower jaw model data in S1 into CAD software, designing a patient front inner crown model in the CAD software according to the addition of a neck margin line, crown parameters and a lingual side reinforcing rod, and storing an STL-format in the CAD software according to a retainer base gum line, crown parameters and a designed rear tooth fixed bridge model of a connecting body;
s3, processing data of the dental crown fixing bridge: loading STL format maxillary anterior crown and maxillary posterior fixed bridge models of CAD software in S2 into rapid prototyping software Magics15.01, carrying out triangular plate refining repair on part models in the Magics software, adjusting model space placement positions, adding a support structure and layering a discrete model to obtain layer profile information, storing the layer profile information as CLI format data, importing the stored CLI format data into rapid prototyping RP software, setting a supported scanning strategy mode as profile scanning, setting a part scanning mode as S-type orthogonal stacking fault + rear edge-pointing scanning and storing the part as PLT format;
s4, processing by a selective laser melting technology: importing the PLT format file processed in the S3 into a unmetal-100 forming machine, and processing the formed material in the forming machine by adopting an S-shaped orthogonal stacking fault + after-edge-hooking scanning strategy to perform selective laser melting technology to obtain a model entity;
s5, repairing the model, cleaning and polishing: and taking the part and the support down from the substrate by adopting a linear cutting mode, removing the support, and carrying out grinding, polishing, trying-on, polishing of a polished surface, sand blasting of a cemented surface, pre-oxidation and porcelain glazing on the dental crown fixing bridge to obtain a personalized dental crown fixing bridge prosthesis finished product.
2. The method for preparing a model for repairing a fixed implant bridge according to claim 1, wherein: in S1, the scanning parameters of the spiral CT scanner are set to 1mm of thread pitch, 2mm of layer thickness and 0.1-0.2mm of interval.
3. The method for preparing a model for repairing a fixed implant bridge according to claim 1, wherein: in S3, triangular piece thinning and repairing are carried out on the part model in Magics software, surface thinning and smoothing are carried out on the maxillary anterior inner crown and maxillary posterior fixed bridge model, and the modified geometric error value is 0.005.
4. The method for preparing a model for repairing a fixed implant bridge according to claim 1, wherein: in S3, adjusting the space position of the parts by using a rotation command in Magics software to enable the inner surface of the dental crown to face upwards and the outer surface to be placed downwards, and after completing the space position adjustment of each maxillary anterior inner crown, each maxillary anterior fixed bridge and each maxillary posterior fixed bridge, reasonably arranging the forming and placing positions of the dental crown fixed bridges to enable the crown bridge arrangement direction of the maxillary posterior fixed bridges to form 45 degrees with the X/Y scanning direction.
5. The method for preparing a model for repairing a fixed implant bridge according to claim 1, wherein: in S4, the molding material is cobalt-chromium alloy powder, and the particle size of the cobalt-chromium alloy powder is 25.8-34.5 μm.
6. The method for preparing a model for repairing a fixed implant bridge according to claim 1, wherein: and S5, taking down the parts and the support from the substrate by adopting a linear cutting mode, manually removing the support structure, grinding and cutting the outer surface of the cobalt-chromium alloy dental crown fixing bridge by using an alunite lathe needle, sequentially grinding and polishing to obtain a prosthesis with a smooth surface, and then trial-wearing and adjusting on a dental model.
7. The implant carrier of claim 6The preparation method of the fixed bridge repairing model is characterized in that the fixed bridge repairing model is properly adjusted on a dental model, the external surface of the crown fixed bridge is polished by a rubber polishing wheel, attachments and oxides on the internal surface and the external surface are cleaned by an ultrasonic cleaner, and 80-mesh alumina is used for cleaning at 2 × 105-4×105And carrying out sand blasting under the pressure Pa to form a micro coarsening surface, and carrying out ultrasonic cleaning again.
8. The method for preparing a model for repairing a fixed implant bridge according to claim 7, wherein: and after the clean oil-free cobalt-chromium alloy base crown is obtained through ultrasonic cleaning, the base crown is placed into a porcelain oven to be subjected to degassing preoxidation treatment to remove impurity gas, and the outer surface of the base crown is sequentially coated with and fused with opaque color-masking base porcelain, dentin porcelain and enamel porcelain to obtain a finished product of the personalized dental crown fixed bridge prosthesis.
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| RU202815U1 (en) * | 2020-11-02 | 2021-03-09 | Гюльнара Рафиковна Газиева | DEVICE FOR AUTOMATED PRODUCTION OF GYPSUM MODELS OF JAWS OF TEETH |
| CN113081347A (en) * | 2021-03-26 | 2021-07-09 | 浙江中医药大学附属口腔医院有限公司 | Full-digital restoration method for oral zirconia crown |
| RU2755761C1 (en) * | 2020-11-30 | 2021-09-21 | Гюльнара Рафиковна Газиева | Device for manufacturing orthodontic removable plates |
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