CN117643512A - Method for copying removable partial denture base at free end - Google Patents

Abstract

The invention discloses a method for copying a removable partial denture base at a free end, which comprises the following steps: the method comprises the steps of embedding and fixing an RPD metal bracket by using super-hard gypsum, designing and manufacturing external mark points on the surface of the gypsum, quantitatively controlling the tissue surface and edge grinding depth of an individualized RPD false tooth by means of tools such as ball drills and columnar turning needles with different diameters, designing a positioning ball recess to form a jogged relation with a subsequently printed base positioning ball, obtaining two groups of data of the individualized RPD false tooth before and after grinding, designing and manufacturing a base part to be copied, three-dimensionally printing to obtain a base entity, and completing copying of the individualized RPD false tooth base after bonding and solidification. The technology simplifies the traditional complex process, ensures that the artificial teeth and the metal bracket are not changed in the replication process, improves the accuracy of registration and assembly of different sets of data through determination of all mark points and design of the positioning spherical concave, and improves the clinical restoration effect while realizing the die-free assembly.

Description

Method for copying removable partial denture base at free end

Technical Field

The invention belongs to the technical field of dental treatment, and particularly relates to a method for copying a removable partial denture base at a free end.

Background

Free end dentition defects refer to missing teeth in the rear of the dental arch, where there is no missing form of the natural teeth in the far middle. Compared with the implant repair and the fixation-movement combined repair, the Removable Partial Denture (RPD) has wide application range, small preparation amount for the tooth body and low cost, and is more commonly used in clinic. However, RPD repair is a difficult problem for patients with distal free end deletions in the mandible, which is significantly affected by abutment conditions and missing alveolar ridge. A successful set of free end missing RPDs typically requires the denture stent to achieve stability across the arch, with the free saddle maximally covering the alveolar ridge of the toothless area for effective stress control. The literature reports and textbooks have focused on denture stent designs, clasp and clasp group options and uses in the near-middleIn the aspect of support and the like, the impression technology is not deeply studied. In fact, denture designs typically employ mucosal support when the number of missing teeth is high and Yu Liuji teeth are poorly conditioned. At that time, the mucosal properties of the remaining alveolar ridge play a vital role. The mucous membrane of the denture bearing area of part of patients is poor in condition (such as severely atrophic alveolar ridge, thin mucous membrane without elasticity, obvious inverted concave bone ridge exists, the boundary of the bearing area is difficult to define and the like), the bearing area is low in tolerance to the biting load, the mucous membrane is easy to damage repeatedly after wearing the denture, if the denture is ground and changed for many times, the pain is not obviously relieved, the tightness between the denture and the tissue surface of the oral mucosa is reduced due to excessive grinding and changing times of the denture, and finally food impaction, instability of the denture and chewing dysfunction are caused. Therefore, it is particularly important to balance the supporting force between the alveolar ridge and the abutment by making the abutment to meet physiological requirements.

Although a plurality of researches show that compared with the traditional anatomical impression, the preparation of the functional impression can not only obtain the accurate anatomical form of the remained teeth, but also reflect the functional activity states of periodontal ligament, alveolar ridge mucosa, and surrounding muscles and laces of the denture, thereby reducing the occurrence of sinking, tenderness and the like in the denture use process to a great extent, increasing the stress of the mucosa supporting tissue, the retention and stability of the denture, and effectively improving the chewing efficiency of patients. However, there are some limitations in this technique, such as that the technique can only record transient movement states, that the muscular function movement performed during occlusion does not necessarily represent the entire movement of the oral function, that the sensitivity of the technique is high, that the occlusal pressure of the patient is difficult to control, etc. Once the denture base is improperly manufactured, it is often necessary to re-line under functional stress. The conventional soft lining materials (such as acrylic esters) are easy to solidify at room temperature or in an oral environment, the time for shaping the functions of the main muscles of patients is short, the forms of mucous membranes of the patients in the functional movements of language, chewing, swallowing and the like cannot be completely recorded, frequent clinical evaluation and periodic replacement are required, and the application is limited. In recent years, the use of a viscoelastic-tissue modifier made up of a polymer powder and a liquid plasticizer has been effective in making up for the above-mentioned drawbacks to some extent. As a short-term cushioning material, this material exhibits a variety of characteristics: under the biting pressure of chewing and the like, the plastic has good fluidity, good viscoelasticity in clinical plastic period, can be kept for a plurality of days, resists the deformation of mucous membrane, is leached out by the plasticizer in clinical unchanged period, and has hard material and slightly poorer elasticity. Based on the above characteristics, it is often used for the adjustment of deformed, inflamed and damaged mucous membranes, dynamic function impression taking, denture space restoration, temporary pad/temporary prosthesis making, experimental evaluation before clinical base lengthening, transition denture adjustment after implant implantation and post-gingiva shaping, occlusion prosthesis making for cancer patients after operation to occlude wounds, and the like.

A large number of clinical practices and researches show that the tissue regulator can greatly improve two problems of clinical denture restoration, namely pain, helping the distorted mucous membrane rebound, and smoothly buffering and dispersingForce is adjusted to injured mucous membrane tissues, so that tenderness is reduced; secondly, the artificial tooth is retained and padded on the tissue surface of the artificial tooth, and the mucous membrane functional state (such as mouth is dynamically recordedChewing, speech, swallowing, and side functions, etc.) the form of the denture base and the margin, restoring denture space. However, because it is susceptible to saliva and external factors, and the like, viscoelastic and anatomic detail replication ability can be significantly reduced with the exudation of ethanol and plasticizers, and surface integrity, water absorption and finish begin to be lost at 3-4d, which in a way will enhance the adhesion of microorganisms to the material, promote bacterial and fungal growth, cause candida-related denture stomatitis; secondly, the material has poor color stability, the color of the denture tissue surface is easy to change, the denture tissue surface gradually turns yellow along with the extension of wearing time, and the adhesion to the denture base support is gradually lost. Therefore, the tissue conditioner cannot be used for a long time, and needs to be replaced in time after the denture tissue surface and the edge form are stable.

The replication method reported clinically at present mainly aims at complete dentures, and has little research on RPD. These methods include:

(1) The hot-pressing injection molding technology has the technological process shown in figures 1-4.

1) The edge of the personalized denture base which needs to be duplicated is completely trimmed, a separating agent is coated, reversible putty type silicon rubber is used for surrounding a mold, super hard gypsum is poured, and a mold which is consistent with the tissue surface of the original denture is turned over (figure 1).

2) Coating a separating agent on an individual denture, filling the separating agent into a lower half box, pouring impression plaster, pouring dental wax into the lower half box after the plaster is solidified, making a casting way, copying the artificial dentition position by irreversible clay type silicone rubber, pouring the impression plaster into the upper half box, filling the upper half box and the lower half box, and removing the wax by boiling water. The upper half box is opened, a female die cavity of the original denture is formed in the visible box, and the lower half box gently prizes the denture to completely separate the denture from the plaster (figure 2).

3) The individual denture dentition is separated from the base, the dentition is located on the upper half-type box, the base injection molding resin is injected into the box female mold cavity and the gypsum mold through the upper box casting channel and the lower box casting channel, the base is molded by a hot-press injection molding machine, and the box opening instrument is used for opening the box (figure 3).

4) The lower half box is removed, soaked in water, the impression plaster is fully swelled, the replica denture in the female die cavity is taken out, and the denture is polished and polished to finish the denture manufacture (figure 4).

The limitations are: the traditional manual operation process is complicated, time and labor are wasted, the technical sensitivity is high, the technician experience is depended, human errors and material deformation generated by gypsum model casting are unavoidable, the base resin is easy to undergo polymerization shrinkage deformation, and the suitability of the base and the mucous membrane in the mouth is affected to a certain extent; before the artificial teeth are separated from the base, although irreversible oil sludge type silicone rubber is used for copying the positions of artificial teeth, guiding the subsequent tooth arrangement, after the silicone rubber is hardened, more or less deviation exists, the artificial teeth cannot be accurately copied, and the chair side can be adjusted againLonger patient waiting time, etc.;

(2) The process flow of the digitizing technique is shown in fig. 5-7.

1) The personalized false tooth to be copied is digitally scanned (an intraoral scanner or a model scanner), the morphological information data of the polished surface and the tissue surface of the personalized false tooth is obtained, and is trimmed by utilizing three-dimensional modeling software to form a complete personalized false tooth scanning file, and the file is stored in an STL format.

2) According to different processing modes, the method can be divided into two types of numerical control cutting and 3D printing

(1) Numerical control cutting: importing an STL-format complete personalized denture scanning file into CAM software, calculating a cutter and a path required by numerical control cutting, checking a cutting scheme, calculating to generate a CAM file, transmitting the CAM file to a numerical control machine tool, and operating the numerical control machine tool to finish the cutting of the digital denture; the method can be divided into two types of split cutting and integrated cutting according to different cutting resin discs, wherein the former needs to finish the bonding of a base and an artificial tooth in the later stage (figure 5), and the latter needs to perform external dyeing treatment on the neck edge in the later stage due to the characteristics of the double-color resin disc so as to meet the attractive requirement (figure 6);

(2) 3D printing: the complete personalized denture scan file in STL format is imported into digital slicing software to complete support addition, after printing parameter setting, data are sent to a 3D printer, a resin base is printed out through a photo-curing technology, and then finished products or printed resin teeth are bonded to complete denture replication (figure 7). Multicolor integrated printing of dentition and a base cannot be finished at present.

Although the digital technology including numerical control cutting and 3D printing simplifies the complicated process of traditional hot-pressing injection molding to a certain extent, the materials have no polymerization shrinkage, the residual monomers are few, the method has great advantages in terms of manufacturing precision, efficiency and suitability of tissue surfaces, but the step-by-step processing of the base and the artificial teeth can cause great errors in the process of bonding the teeth in place as the traditional method, and researches show that the average deviation of the occlusal surfaces of the complete denture of the numerical control cutting can reach 0.50mm; although the existing special double-color resin disk can realize the integrated cutting production of false teeth, the outline transition of the artificial tooth-base interface is not natural enough, the external dyeing treatment is still needed to be carried out on the neck margin in the later period to meet the beautiful requirement, and matched software is needed, so that the material utilization rate is low, and the technical requirement and the cost are high.

More importantly, the above denture replication technique may not be applicable to RPD re-lining replacements that involve metal stent designs. Therefore, a method for RPD personalized denture base replication is sought that not only can accurately replicate denture tissue surfaces and edges, but also can ensure denture occlusal surface accuracy, and the metal brackets and artificial teeth are not affected.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a method for copying the removable partial denture base at the free end, which aims to save time, reduce material consumption, reduce labor intensity of technicians, reduce waiting period of patients, avoid deviation caused by human factors and material deformation, improve the accuracy of denture copying and promote clinical restoration effect while simplifying the traditional complicated process.

In a first aspect, the present invention provides a method of replicating a free-end Removable Partial Denture (RPD) denture, also a method of personalized denture replication using digital technology, comprising the steps of:

s1, manufacturing a box for fixing a bracket, resetting the bracket in a female die cavity in the box, and pouring super-hard gypsum (super-hard gypsum is a gypsum material, and a fine clinical pouring model is commonly used, so that the hardness is higher than that of common white gypsum, and the bracket is not easy to crack in the operation process), so that the embedding and fixing of the bracket are completed;

s2, using ball drills to etch spherical grooves on the cheek side, the lingual side and the upper surface of the plaster model respectively; carving 1 irregular wavy line on the cheek and tongue side surfaces of the plaster model respectively by using columnar turning needles;

s3, comprehensively scanning by using an intraoral scanner, acquiring data information such as a tissue surface, a polished surface, an occlusal surface, embedded gypsum and the like, importing reverse engineering design software, trimming the rest of the surface sheets, checking and repairing related data, and obtaining personalized RPD denture data;

s4, using ball drills to manufacture 1.5-2mm depth fixing grooves on the tissue surface and the edge of the personalized RPD denture base which need to be duplicated, uniformly grinding, manufacturing 3 positioning ball pits on the tissue surface after grinding, and realizing die-free assembly by utilizing the embedding relation between the positioning ball pits and the positioning balls of the subsequent printing base;

s5, repeating the step S3 to obtain the abraded personalized RPD denture data, and designing and manufacturing the base part to be copied through the personalized RPD denture data and the abraded personalized RPD denture data;

s6, importing slicing software to carry out support addition and printing parameter setting, importing a 3D printer to carry out layer-by-layer printing through photo-curing molding, removing the support after printing is finished, and then carrying out post-curing treatment to obtain a printing base;

and S7, completely positioning the printing base obtained in the S6 on the abraded personalized RPD false tooth through the positioning spherical concave relation, and bonding, solidifying, grinding and polishing to complete copying.

Further, the manufacturing of the bracket-fixed box comprises the following steps:

and (3) defining the range of the RPD metal bracket by using a marker pen according to the positions of the inner and outer finishing lines, embedding by using soft wax, and wrapping by using alginate to form a bracket-fixed box.

Further, the grinding method comprises the following steps: and (5) uniformly grinding along the depth groove by using a columnar turning needle with the diameter of 1 mm.

Further, after the printing in the step S6 is completed, isopropanol is adopted for cleaning.

Compared with the prior art, the technical scheme provided by the embodiment of the application has at least the following advantages:

1. the invention discloses a method for copying a personalized base of a free-end Removable Partial Denture (RPD) by using a digitizing technology, which can solve the problem of copying the personalized base after the tissue regulator of the free-end removable partial denture is re-lined clinically and ensure that the artificial teeth and a metal bracket are not changed in the copying process; the problems of complicated operation, time consumption and material consumption, large denture manufacturing precision deviation caused by human factors and material shrinkage deformation, long waiting period of patients and the like of the traditional denture copying process can be solved; the experience dependence on the traditional technology can be reduced, the technical sensitivity is reduced, convenience is provided for beginners, and a standardized manufacturing flow is formed; the technology has strong popularization, the related software is easy to operate, the application range of the method is wider, and the method can be extended to the duplication of the personalized base after the application of the bilateral far and middle free ends are deleted, complete denture and even prosthesis case tissue regulator.

2. The replication method of the invention simplifies the traditional complex process, ensures that the artificial teeth and the metal bracket are not changed, quantitatively controls the personalized RPD false tooth tissue surface and edge grinding depth through tools such as ball drills, columnar turning needles and the like with different diameters, and improves the registration precision of different groups of data and the precision of the base assembly through the determination of the external mark points on the surface of the embedded gypsum and the design and manufacture of the positioning spherical concave of the tissue surface of the base, thereby realizing the die-free assembly and improving the clinical restoration effect.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic illustration of prior art hot-press injection molding techniques for performing a form-fitting infusion of a personalized denture base to be replicated;

FIG. 2 is a schematic illustration of a complete separation of a denture from gypsum using a hot press injection molding technique;

FIG. 3 is a schematic illustration of a hot-press injection molding technique for reproducing denture dentition reduction and base formation;

FIG. 4 is a schematic diagram of a replica denture manufactured by the hot-press injection molding technique;

FIG. 5 is a process diagram of numerical control split cutting in the prior art;

FIG. 6 is a process diagram of numerical control integrated cutting in the digitizing technology;

FIG. 7 is a process diagram of digitizing 3D printing;

FIG. 8 is a preparation flow of step one in the example;

FIG. 9 is a process flow of step two of the example;

FIG. 10 is a preparation flow of step three in the example;

FIG. 11 is a preparation flow of step four in the example;

FIG. 12 is a preparation flow of step five in the example;

FIG. 13 is a preparation flow of step six in the example;

FIG. 14 shows a process for preparing step seven in the example.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

Unless specifically indicated otherwise, the various raw materials, reagents, instruments, equipment, and the like used in this application are commercially available or may be prepared by existing methods.

The principles and features of the present invention are described below in connection with the following examples, which are set forth to illustrate, but are not to be construed as limiting the scope of the invention. The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.

Examples

The embodiment provides a method for copying a removable partial denture base at a free end, which comprises the following steps:

step one: embedding and fixing of personalized RPD false tooth metal bracket

And (3) defining the range of the RPD metal bracket by using a marker pen according to the positions of the inner and outer finishing lines, embedding by using soft wax, and wrapping by using alginate to form a bracket-fixed box. After the impression material is solidified, hot water is used for flushing soft wax, the bracket is restored in the female die cavity of the box, and the super hard gypsum is poured to finish embedding and fixing of the bracket.

The purpose of this step is to: the metal reflection of the bracket is reduced, the subsequent optical scanning is facilitated, and meanwhile, the accuracy of matching between the personalized RPD false tooth and the personalized RPD false tooth after the material is ground is ensured by designing a plurality of external mark points on the surface of the gypsum.

As shown in FIG. 8, the mark 1-1 in FIG. 8 is a personalized RPD denture metal bracket, 1-2 is a personalized RPD denture base, 1-3 is a soft wax embedding bracket, 1-4 is an alginate type box, 1-5 is a bracket which is reset in a box female mold cavity, and 1-6 is superhard gypsum to finish bracket embedding and fixing.

Step two: design and manufacture of external mark points on gypsum surface

Using spherical drills with the diameter of about 3.6mm to respectively etch 3 spherical grooves on the cheek side, the lingual side and the upper surface of the plaster model, and using the spherical drills as a public part for global registration of the personalized RPD false tooth and the personalized RPD false tooth after subsequent grinding; and (3) carving 1 irregular wavy line on the cheek side surface and the tongue side surface of the plaster model respectively by using columnar turning needles with the diameter of about 1mm, wherein the shape at the vertex is required to be clear and definite so as to be used as a marking point for manually registering the personalized RPD false tooth after subsequent grinding.

As shown in fig. 9, the mark 2-1 in fig. 9 is a superhard gypsum surface ball-drilled groove, 2-2 is a personalized RPD denture occlusal surface, 2-3 is a marked spherical groove, and 2-4 is a marked irregular wavy line.

Step three: digital scanning of personalized RPD dentures

The RPD is scanned by 360 ° using an intraoral scanner (3 shape Trios 3, usa), data information such as a tissue surface, a polished surface, an occlusal surface and embedded gypsum is obtained, a file is stored in an STL format, reverse engineering design software (geomic Wrap 2021,3d System) is imported, a surplus dough sheet is trimmed, and related data of "grid doctor" function inspection and repair are applied, and the model is named as "personalized RPD denture".

As shown in FIG. 10, the mark 3-1 in FIG. 10 is a personalized RPD denture optical model tissue surface, 3-2 is a personalized RPD denture optical model polishing surface, 3-3 is a personalized RPD denture optical model occlusal surface, 3-4 is a super-hard gypsum surface spherical groove, and 3-5 is a super-hard gypsum surface irregular wavy line.

Step four: personalized RPD denture tissue surface and edge abrasion

And (3) using a ball drill with the diameter of about 2mm to manufacture depth-fixing grooves with the depth of about 1.5-2mm on the tissue surface and the edge of the personalized RPD denture base which need to be duplicated, and uniformly grinding the depth-fixing grooves along the depth-fixing grooves by using a columnar turning needle with the diameter of about 1 mm. In order to ensure the assembly precision of the subsequent printing base and the abraded personalized RPD false tooth base, 3 positioning spherical recesses with the diameter of about 1mm and the depth of about 0.5-1mm are manufactured on the abraded tissue surface, and the non-mould assembly is realized by utilizing the jogged relation between the positioning spherical recesses and the printing base positioning spherical balls.

As shown in FIG. 11, the mark 4-1 is the depth of the sphere drill of the tissue surface of the personalized RPD denture, 4-2 is the depth of the sphere drill of the buccal edge of the personalized RPD denture, 4-3 is the depth of the sphere drill of the lingual edge of the personalized RPD denture, 4-4 is the uniform grinding of a columnar needle along a depth groove, 4-5 is the tissue surface of the personalized RPD denture after grinding, 4-6 is the edge of the personalized RPD denture after grinding, and 4-7 is the positioning sphere recess of the tissue surface.

Step five: digital scanning of post-wear personalized RPD dentures

The personalized RPD false tooth after 360-degree scanning and grinding is carried out by using a 3shape Trios 3 (U.S.) oral scanner, data information such as a tissue surface, a grinding surface, an occlusal surface, embedded gypsum and the like is obtained, a file is stored in an STL format, reverse engineering design software (Geomagic Wrap 2021,3D System) is imported, the rest of the dough sheet is trimmed, and related data of 'grid doctor' function inspection and repair are applied and named as 'personalized RPD false tooth after grinding'.

As shown in FIG. 12, the mark 5-1 in FIG. 12 is a post-grinding personalized RPD denture base, 5-2 is a tissue surface positioning spherical recess, 5-3 is a post-grinding personalized RPD denture edge, 5-4 is a spherical groove on the surface of super-hard gypsum, and 5-5 is an irregular wavy line on the surface of super-hard gypsum.

Step six: design and manufacture of printing base

The method comprises the steps of respectively importing the STL files of the finished personalized RPD false tooth and the polished personalized RPD false tooth into reverse engineering design software (Geomagic Wrap 2021,3D System), registering by taking the personalized RPD false tooth as a reference model (a model manager-personalized RPD false tooth-pinning function is applied), simultaneously selecting the personalized RPD false tooth and the polished personalized RPD false tooth by using two sets of data, and respectively selecting 5-10 vertexes of the same position of irregular wave lines on the cheek side/tongue side below the super-hard gypsum model as reference mark points by using a manual registering function to finish model primary registering, and then respectively selecting 9 spherical grooves on the cheek side, the tongue side and the upper surface above the super-hard gypsum model as public parts of global registering of the two so as to finish fine registering of the model.

Then, two groups of data are selected, the model is divided along the inner and outer finishing lines of the bracket through 'selection and penetration', and the gypsum embedding part is deleted by using the 'bounded assembly' and 'Delete' functions, and only the base part needing to be copied remains.

The edge is filled completely by using the "polygon-filling single hole-inner hole" function.

The personalized RPD false tooth processed by the method is named as a personalized RPD base, and the personalized RPD false tooth after grinding is named as a personalized RPD base after grinding.

The "post-grind personalized RPD base" was "polygon-offset overall", the distance was set to 0.1mm (unified, reserved grid), the assembly gap was reserved, and the file was named "post-grind personalized RPD base-offset 0.1mm".

Meanwhile, two files of an 'personalized RPD base' and an 'abraded personalized RPD base-offset of 0.1 mm' are selected, a 'joint-Boolean operation-2 reduction' function (a 'creation boundary', 'original object reservation' and 'orientation result' are checked by a selection column), a subsequent base file needing printing and bonding is obtained after application-determination, a 'grid doctor' function is used for checking the model, and the problematic dough sheet is correspondingly processed.

The file is named as a printing base, is imported into slicing Software (RayWare Software, usa), is subjected to support addition and printing parameter setting, is generated into a spr file, is imported into a 3D printer (sprintlay pro95, usa), and is subjected to layer-by-layer printing through photo-curing molding.

After printing, cleaning with isopropanol, removing the support, and finishing post-curing treatment.

As shown in FIG. 13, the mark 6-1 is a mark point for manual registration of the model, 6-2 is a common area for fine registration of the model, 6-3 is a division of the model, only the copy base part remains, 6-4 is to fill the base edge completely, 6-5 is a personalized RPD base, 6-6 is a ground personalized RPD base-offset of 0.1mm,6-7 is a positioning spherical recess, 6-8 is a printed base tissue surface, 6-9 is a positioning sphere embedded with the positioning spherical recess, 6-10 is a printed base entity, and 6-11 is a positioning sphere entity.

Step seven: personalized RPD denture and printing base bonding after grinding

The printing base is completely positioned on the personalized RPD false tooth after being ground off through the positioning spherical concave relation, and the printing base and the personalized RPD false tooth are firmly bonded through resin, and the false tooth copying is completed through illumination, grinding and polishing.

As shown in FIG. 14, the reference numeral 7-1 in FIG. 14 is a post-wear personalized RPD denture, 7-2 is a printing base, 7-3 is a replication denture tissue surface, 7-4 is a replication denture occlusion surface, 7-5 is a replication denture buccal side edge, and 7-6 is a replication denture lingual side edge.

The embodiment of the invention provides a replication method of removable partial denture base, which is a digital replication technology of a personalized base with a free end missing RPD regulated by a tissue regulator. Firstly, as shown in fig. 8, super hard gypsum is used around an RPD metal stent for embedding and fixing, and the stent embedding is completed by means of gypsum, so that metal reflection is reduced, and the subsequent optical scanning is facilitated;

as shown in fig. 9, a plurality of external marking points are designed on the surface of the plaster to ensure the accuracy of matching the personalized RPD denture with the personalized RPD denture after the base material is ground off;

as shown in fig. 11, during the denture base replication process, the positions of the artificial teeth and the bracket are not changed, the personalized RPD denture tissue surface and edge grinding depth are quantitatively controlled through the diameter of the depth sphere, and the thickness of the printing base is ensured to be uniform;

designing a positioning spherical recess on the tissue surface of the abraded personalized RPD false tooth, utilizing the spherical recess embedding relation between the positioning spherical recess and the positioning spherical recess of the tissue surface of the material abraded false tooth, realizing the die-free assembly, improving the assembly precision of the printing base and the material abraded false tooth base, and reducing the error of the copied false tooth and the personalized RPD false tooth to the maximum extent;

as shown in fig. 13, the design and manufacture of the base portion to be duplicated is performed by acquiring two sets of data of the personalized RPD denture and the personalized RPD denture after grinding;

as shown in fig. 14, after three-dimensional printing, bonding polishing is performed to complete the replication of the substrate.

In summary, the replication method of the invention simplifies the traditional complex process, ensures that the artificial teeth and the metal bracket are not changed, quantitatively controls the personalized RPD false tooth tissue surface and edge grinding depth through tools such as ball drills, columnar turning needles and the like with different diameters, and improves the precision of registration of different groups of data and the precision of base assembly by determining each marking point of the embedded gypsum surface external marking points and designing and manufacturing the locating spherical recess of the base tissue surface, thereby realizing the die-free assembly and improving the clinical restoration effect.

The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A method of replicating a free-end removable partial denture base comprising the steps of:

s1, manufacturing a box with a fixed bracket, resetting the bracket in a female die cavity in the box, and pouring super-hard gypsum to complete embedding and fixing of the bracket;

s2, using ball drills to etch spherical grooves on the cheek side, the lingual side and the upper surface of the plaster model respectively; carving 1 irregular wavy line on the cheek and tongue side surfaces of the plaster model respectively by using columnar turning needles;

s3, comprehensively scanning by using an intraoral scanner, acquiring data information such as a tissue surface, a polished surface, an occlusal surface, embedded gypsum and the like, importing reverse engineering design software, trimming the rest of the surface sheets, checking and repairing related data, and obtaining personalized RPD denture data;

s4, using ball drills to manufacture 1.5-2mm depth fixing grooves on the tissue surface and the edge of the personalized RPD denture base to be duplicated, uniformly grinding, manufacturing 3 positioning ball pits on the tissue surface after grinding, and realizing die-free assembly by utilizing the jogged relation between the positioning ball pits and the printing denture base positioning balls;

s5, repeating the step S3 to obtain the abraded personalized RPD denture data, and designing and manufacturing the base part to be copied through the personalized RPD denture data and the abraded personalized RPD denture data;

s6, importing slicing software to carry out support addition and printing parameter setting, importing a 3D printer to carry out layer-by-layer printing through photo-curing molding, removing the support after printing is finished, and carrying out post-curing treatment to obtain a printing base;

and S7, completely positioning the printing base obtained in the S6 on the abraded personalized RPD false tooth through the positioning spherical concave relation, and bonding, solidifying, grinding and polishing to complete copying.

2. The method of replicating a free-end removable partial denture base according to claim 1, wherein said making a stent-mounted cartridge comprises the steps of:

and (3) defining the range of the RPD metal bracket by using a marker pen according to the positions of the inner and outer finishing lines, embedding by using soft wax, and wrapping by using alginate to form a bracket-fixed box.

3. The method of replicating a free-end removable partial denture base according to claim 1, wherein the grinding out is by: and (5) uniformly grinding along the depth groove by using a columnar turning needle with the diameter of 1 mm.

4. The method of replicating a free-end removable partial denture base according to claim 1, wherein said step S6 is performed by cleaning with isopropyl alcohol after printing is completed.