A method for preparing a resin block for dental cutting processing

Abstract

The invention discloses a method for preparing a resin block for dental cutting, which belongs to the field of oral medicine. The resin plates of upper and lower mandibular full-mouth dentures with overlapping posterior tooth regions are designed, and then gum-colored and tooth-colored resin model data are designed respectively, and a mold is prepared by using 3D printing technology; gum-colored and tooth-colored resin blocks are processed respectively, and then pressurized and polymerized. The resin block made by the method proposed by the invention has two-way penetration of the boundary colors of the gum-colored resin block and the tooth-colored resin block, and the maxillary and mandibular full-mouth dentures overlap in the posterior tooth region, and can be used to cut the maxillary or mandibular full-mouth dentures, and the remaining part can cut the dentition and base of the partial removable denture, thereby improving the utilization rate of the resin block, and at the same time meeting the personalized and precise distribution of the tooth color and gum color of the aesthetic region of the maxillary and mandibular anterior teeth, and solving the problem of insufficient mechanical and aesthetic properties of the full-mouth dentures made by cutting processing of CAD / CAM devices in the prior art.

Description

Technical Field

[0001] The invention relates to the field of oral medical technology, and more particularly to a method for preparing a resin block for dental cutting processing. Background Art

[0002] CAD / CAM technology has been widely used in multiple disciplines of dentistry. The CAD / CAM system for oral restoration mainly includes three parts: data acquisition, computer-aided design and computer-aided processing. After more than 40 years of research, this technology has occupied a place in the field of oral fixed restoration, and has well demonstrated the superiority of CAD / CAM technology, improving efficiency, reducing the labor intensity of medical and technical personnel, improving the quality of restorations, and reducing the impact of factors such as the experience and personal quality of medical and technical personnel.

[0003] Dentures are the main way to repair missing teeth. When making dentures, it is often necessary to restore the missing teeth and partially missing gums at the same time. Teeth are white, while gums are pink. Due to individual differences, the three-dimensional shape of teeth, gum shape, relative position and size ratio of each person are different, and the curvature and size of the dental arch curve are also different.

[0004] At present, in terms of digital processing and forming, the existing technology mainly adopts the following methods: 1. The artificial teeth and gums are separately CNC-processed and assembled together and bonded, but this method has a large assembly error; 2. The tooth-colored material and the gum-colored material are printed and formed in an integrated manner, but the currently used light-curing printing process has inferior mechanical properties to the material blocks pressed at high temperature and high pressure, and the performance is insufficient; 3. The tooth-colored material and the gum-colored material are pressed together to form a prefabricated material block, and then the whole is CNC-cut to form, but the existing two-color materials are mostly simple two-dimensional plane stratification, which cannot meet the personalized forming of the tooth-gum interface, and need to be dyed later to make up for it, which is time-consuming and labor-intensive, and the dye is easy to fade; three-dimensional layered materials have also appeared, but the interface design between the layers is relatively simple, and the material waste is large, which cannot meet the actual clinical needs.

[0005] Therefore, it is an urgent problem for technical personnel in this field to provide a method for preparing resin blocks for dental cutting processing, so that the processed full dentures have good mechanical properties, while meeting the personalized and precise distribution of tooth color and gum color in the aesthetic areas of the maxillary and mandibular anterior teeth, and improving the utilization rate of the resin blocks. Summary of the invention

[0006] In view of this, the present invention provides a method for preparing a resin block for dental cutting processing to solve the problem of insufficient mechanical and aesthetic properties of complete dentures produced by cutting processing using CAD / CAM devices in the prior art, while improving the utilization rate of the resin block.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions, including:

[0008] The present invention provides a method for preparing a resin block for dental cutting processing, and the specific steps are as follows:

[0009] S1. Processing the three-dimensional model data in the full-mouth edentulous jaw model database, constructing maxillary and mandibular edentulous jaw base models, arranging the maxillary and mandibular edentulous jaw base models at 180 degrees, overlapping the posterior tooth areas, and obtaining a wavy circular gingival line boundary surface;

[0010] S2, using design software to expand the wavy circular gingival line boundary curved surface in the horizontal direction until it is projected into a circular continuous surface in the vertical direction; using the continuous surface where the wavy circular gingival line boundary curved surface area is located as a boundary, designing upper and lower layers and generating gum-colored resin block model data A and tooth-colored resin block model data B;

[0011] S3, generating gum-colored resin block molding die data C according to the gum-colored resin block model data A; generating tooth-colored resin block molding die data D according to the tooth-colored resin block model data B;

[0012] S4, importing the gum-colored resin block forming mold data C and the tooth-colored resin block forming mold data D into a 3D printing device to print out a gum-colored resin block forming mold E and a tooth-colored resin block forming mold F respectively;

[0013] S5, placing the printed gum-colored resin block forming mold E with the gum line scallop side facing downward, and spreading a layer of tooth-colored dental resin powder on the gum line scallop surface area; then mixing the gum-colored dental resin material powder with the tray water evenly, filling them into the gum-colored resin block forming mold E, and then pressurizing and polymerizing them in a vulcanizer to obtain a gum-colored resin block G;

[0014] S6, placing the printed tooth-colored resin block forming mold F with the gum line scallop side facing downward, and spreading a layer of gum-colored dental resin powder on the gum line scallop area; then mixing the tooth-colored dental resin material powder with the dental tray water evenly, filling the mixture into the tooth-colored resin block forming mold F, and then pressurizing and polymerizing the mixture in a vulcanizer to obtain a tooth-colored resin block H;

[0015] S7, combining the gum-colored resin block G and the tooth-colored resin block H up and down, and polymerizing them under pressure in a vulcanizer to obtain a multi-color synthetic resin block I;

[0016] S8. Trim the shape of the multi-color synthetic resin block I and process it into a shape that meets the needs of CAD / CAM engraving equipment fixtures.

[0017] Preferably, the processing of the three-dimensional model data in the full-mouth edentulous jaw model database in S1 to construct the maxillary and mandibular edentulous jaw base models includes:

[0018] Artificial intelligence software is used to divide the three-dimensional model data in the full-mouth edentulous jaw model database into several types and encode them according to the dental arch morphology of square round type, pointed round type, oval type and mixed type; a type of maxillary and mandibular mucosal plane data model is extracted from the different types of model data, and the maxillary and mandibular gingival edge lines are depicted on the maxillary and mandibular mucosal planes based on oral anatomical gingival morphology to obtain the maxillary and mandibular edentulous jaw base model data, and the maxillary and mandibular edentulous jaw base models are constructed according to the maxillary and mandibular edentulous jaw base model data.

[0019] Preferably, the wavy circular gingival line boundary surface in S1 is composed of a plurality of gingival papilla straight lines and gingival scallop surfaces.

[0020] Preferably, the steps of obtaining the gingival papilla straight line and the gingival scallop curved surface are as follows:

[0021] Data of different dental arch sizes were extracted from the same type of edentulous jaw base model data for fitting. By adjusting the width between adjacent gingival papilla peaks, gingival papilla straight lines distributed perpendicular to the gingival line were obtained. The gingival scallop surface was located between the gingival papilla straight lines.

[0022] Preferably, the continuous surface projected as a circle in the vertical direction is characterized by being composed of a central horizontal plane and a peripheral wavy gum line boundary curved surface; and the wavy gum line boundary curved surface is distributed radially from the central horizontal plane.

[0023] Preferably, the step S2 of designing the upper and lower layers with the continuous surface where the wavy circular gingival line boundary curved surface area is located as the boundary and generating gum color resin block model data A and tooth color resin block model data B includes:

[0024] The upper and lower regions are designed with the continuous surface where the wavy circular gingival line boundary curve is located as the boundary; the thickness of the upper region is higher than the vertical height of the edentulous jaw base, and the gum-colored resin block model data A is generated; the thickness of the lower region is greater than the crown height, and the tooth-colored resin block model data B is generated.

[0025] Preferably, the gum-colored resin block molding mold data C in S3 includes positioning points at the middle gum line of the upper and lower central incisors.

[0026] Preferably, the thickness of the layer of tooth-colored dental resin powder spread on the scallop surface area of ​​the gum line in S5 and the thickness of the layer of gum-colored dental resin powder spread on the scallop surface area of ​​the gum line in S6 are both 1 mm to 3 mm.

[0027] Preferably, the resin powder is one of the resin materials suitable for preparing oral restorations, such as polymethyl methacrylate (PMMA) and polyetheretherketone (PEEK).

[0028] It can be seen from the above technical solution that, compared with the prior art, the present invention discloses a resin block for dental cutting and a preparation method thereof, and the beneficial effects are as follows:

[0029] 1. The resin block of the present invention is designed by arranging the maxillary and mandibular edentulous base models at 180 degrees and overlapping the posterior tooth areas, thereby obtaining a wavy circular gingival dividing line surface. This structure can meet the processing of maxillary or mandibular full dentures and reduce the inventory of denture processing plants; the remaining part after completing the processing of maxillary or mandibular full dentures can also be used to cut partial removable dentures and bases, thereby improving the utilization rate of the resin block.

[0030] 2. By spreading a layer of tooth-colored dental resin powder on the scallop surface of the gum line and a layer of gum-colored dental resin powder on the scallop surface of the tooth line, it can meet the personalized and precise distribution of tooth color and gum color in the aesthetic areas of the maxillary and mandibular anterior teeth, achieve color gradient in the area near the gum line in the anterior teeth area, be more realistic, and improve aesthetic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0032] Figure 1 This is a model diagram of the gum-colored resin block of the present invention.

[0033] Figure 2 It is a model diagram of the tooth-colored resin block of the present invention.

[0034] Figure 3 This is a schematic diagram of the structure of the resin block for dental cutting processing of the present invention.

[0035] Among them, G is a gum-colored resin block; H is a tooth-colored resin block; 21 is the center of the tooth resin block; 22 is the outer periphery of the tooth resin block; 31 is a straight line of the gingival papilla, and 32 is a scallop surface of the gingiva. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The embodiment of the present invention discloses a method for preparing a resin block for dental cutting processing, and the specific steps are as follows:

[0038] S1. Using artificial intelligence software, 100,000 three-dimensional model data in the full-mouth edentulous jaw model database were divided into four types according to the dental arch shape: square-round type, pointed-round type, oval type and mixed type, and coded A1, A2, A3, A4; a type of maxillary and mandibular mucosal plane data model was extracted from the A1 model data, and the maxillary and mandibular gingival margin lines were depicted on the maxillary and mandibular mucosal planes based on oral anatomical gingival morphology to obtain the maxillary and mandibular edentulous jaw base model data; the maxillary and mandibular edentulous jaw bases were arranged at 180 degrees, and the posterior teeth area was overlapped to obtain the gingival scallop surface to form a circular gingival line boundary surface;

[0039] S2. Use the design software to expand the circular gingival line boundary surface area in the horizontal direction to a continuous surface projected as a circle in the vertical direction; design the upper and lower layers with the continuous surface where the gingival line boundary surface area is located as the boundary, and the thickness of the upper layer area is higher than the vertical height of the edentulous jaw base, and generate the gingival color resin block model data A, such as Figure 1 As shown; the thickness of the lower layer area is greater than the crown height, and the tooth-colored resin block model data B is generated, such as Figure 2 As shown in the figure; the size of the gum-colored resin block model and the tooth-colored resin block model after being combined up and down meets the size used by the CAD / CAM engraving equipment fixture;

[0040] S3, generating gum-colored resin block molding mold data C according to gum-colored resin block model data A, wherein data C includes a positioning point at the middle gum line of the upper and lower central incisors; generating tooth-colored resin block molding mold data D according to tooth-colored resin block model data B;

[0041] S4, importing data C and data D into a 3D printing device to print out a gum-colored resin block forming mold E and a tooth-colored resin block forming mold F respectively;

[0042] S5. Place the printed mold E with the gum line scallop side facing downward, and spread a layer of tooth-colored dental PMMA resin powder on the gum line scallop area, with a powder thickness of 2 mm; then mix the gum-colored dental PMMA resin material powder and the tray water evenly, and after the mixture enters the dough stage, fill it into the mold E, and then pressurize and polymerize it in a vulcanizer to obtain a gum-colored resin block G;

[0043] S6. Place the printed mold F with the gum line scallop side facing downward, and spread a layer of gum-colored dental PMMA resin powder on the gum line scallop area, with a powder thickness of 2 mm; then mix the tooth-colored dental PMMA resin material powder and the tray water evenly, and after the mixture enters the dough stage, fill it into the mold F, and then pressurize and polymerize it in a vulcanizer to obtain a tooth-colored resin block H;

[0044] S7, combining the gum-colored resin block G and the tooth-colored resin block H up and down, and polymerizing them under pressure in a vulcanizer to obtain a multi-color synthetic resin block I;

[0045] S8. The shape of the multi-color synthetic resin block I is trimmed and processed into a shape that meets the use of the CAD / CAM engraving equipment fixture. The shape diagram of the resin block is shown in FIG. Figure 3 shown.

[0046] according to Figure 3 The dental cutting resin block prepared by the method proposed in the present invention includes a gum-colored resin block G and a tooth-colored resin block H; Figure 1 and Figure 2 , both of which are composed of a central part and a peripheral part; wherein, the central part of the gum-colored resin block G is placed corresponding to the central part 21 of the tooth-colored resin block H, and the connecting surface is a horizontal plane; the peripheral part of the gum-colored resin block G is connected to the peripheral part of the tooth-colored resin block H by a wavy surface, which is the wavy circular gingival line dividing surface.

[0047] Specifically, the wavy circular gingival line boundary surface is composed of a number of gingival papilla straight lines 31 and gingival scallop surfaces 32, which are radially distributed with the central horizontal plane as the center.

[0048] Data of different dental arch sizes are extracted from the same type of edentulous jaw base model data for fitting, and the gingival papilla straight lines 31 distributed perpendicular to the gingival line are obtained by adjusting the width between adjacent gingival papilla peaks. The gingival scallop surface 32 is located between the gingival papilla straight lines 31.

[0049] In addition, the design of the maxillary complete denture and the mandibular complete denture of the resin block overlaps in the posterior tooth area, and can be used to process maxillary complete dentures or mandibular complete dentures. The remaining part can also be used to process partial removable dentures and bases, thereby improving the utilization rate of the resin block.

[0050] By spreading a layer of tooth-colored dental PMMA resin powder on the scallop surface area of ​​the gum line and a layer of gum-colored dental PMMA resin powder on the scallop surface area of ​​the tooth line, the colors of the boundaries between the gum-colored resin block G and the tooth-colored resin block H of the present invention are blended in a gradient manner, which is more realistic and improves the aesthetic performance.

[0051] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0052] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing a resin block for dental cutting, characterized in that: The following steps are involved: S1. Processing the three-dimensional model data in the full-mouth edentulous jaw model database, constructing maxillary and mandibular edentulous jaw base models, arranging the maxillary and mandibular edentulous jaw base models at 180 degrees, overlapping the posterior tooth areas, and obtaining a wavy circular gingival line boundary surface; S2, using design software to expand the wavy circular gingival line boundary curved surface in the horizontal direction until it is projected into a circular continuous surface in the vertical direction; using the continuous surface where the wavy circular gingival line boundary curved surface area is located as a boundary, designing upper and lower layers and generating gum-colored resin block model data A and tooth-colored resin block model data B; S3, generating gum-colored resin block molding die data C according to the gum-colored resin block model data A; generating tooth-colored resin block molding die data D according to the tooth-colored resin block model data B; S4, importing the gum-colored resin block forming mold data C and the tooth-colored resin block forming mold data D into a 3D printing device to print out a gum-colored resin block forming mold E and a tooth-colored resin block forming mold F respectively; S5, placing the printed gum-colored resin block forming mold E with the gum line scallop side facing downward, and spreading a layer of tooth-colored dental resin powder on the gum line scallop surface area; then mixing the gum-colored dental resin material powder with the tray water evenly, filling them into the gum-colored resin block forming mold E, and then pressurizing and polymerizing them in a vulcanizer to obtain a gum-colored resin block G; S6, placing the printed tooth-colored resin block forming mold F with the gum line scallop side facing downward, and spreading a layer of gum-colored dental resin powder on the gum line scallop area; then mixing the tooth-colored dental resin material powder with the dental tray water evenly, filling the mixture into the tooth-colored resin block forming mold F, and then pressurizing and polymerizing the mixture in a vulcanizer to obtain a tooth-colored resin block H; S7, combining the gum-colored resin block G and the tooth-colored resin block H up and down, and polymerizing them under pressure in a vulcanizer to obtain a multi-color synthetic resin block I; S8, trimming the shape of the multi-color synthetic resin block I and processing it into a shape that meets the use of CAD / CAM engraving equipment fixtures; The continuous surface in S2 that is projected as a circle in the vertical direction is characterized by being composed of a central horizontal plane and a peripheral wavy gum line boundary curved surface; the wavy gum line boundary curved surface is radially distributed from the central horizontal plane.

2. The method for preparing a dental resin block for cutting processing according to claim 1, characterized in that: The step S1 processes the three-dimensional model data in the full-mouth edentulous jaw model database to construct the maxillary and mandibular edentulous jaw base models, including: Artificial intelligence software is used to divide the three-dimensional model data in the full-mouth edentulous jaw model database into several types and encode them according to the dental arch morphology of square round type, pointed round type, oval type and mixed type; a type of maxillary and mandibular mucosal plane data model is extracted from the different types of model data, and the maxillary and mandibular gingival edge lines are depicted on the maxillary and mandibular mucosal planes based on oral anatomical gingival morphology to obtain the maxillary and mandibular edentulous jaw base model data, and the maxillary and mandibular edentulous jaw base models are constructed according to the maxillary and mandibular edentulous jaw base model data.

3. The method for preparing a dental resin block for cutting processing according to claim 1, characterized in that: The wavy circular gingival line boundary surface in S1 is composed of a number of gingival papilla straight lines and gingival scallop surfaces.

4. The method for preparing a dental resin block for cutting processing according to claim 3, characterized in that: The steps of obtaining the gingival papilla straight line and the gingival scallop surface are as follows: Data of different dental arch sizes were extracted from the same type of edentulous jaw base model data for fitting. By adjusting the width between adjacent gingival papilla peaks, gingival papilla straight lines distributed perpendicular to the gingival line were obtained. The gingival scallop surface was located between the gingival papilla straight lines.

5. The method for preparing a dental resin block for cutting processing according to claim 1, characterized in that: The step S2 uses the continuous surface where the wavy circular gingival line boundary curved surface area is located as a boundary to design the upper and lower layers and generate gum color resin block model data A and tooth color resin block model data B, including: The upper and lower regions are designed with the continuous surface where the wavy circular gingival line boundary curve is located as the boundary; the upper region generates gum-colored resin block model data A; the lower region generates tooth-colored resin block model data B.

6. The method for preparing a dental resin block for cutting processing according to claim 1, characterized in that: The gum-colored resin block molding mold data C in S3 includes positioning points at the middle gum line of the upper and lower central incisors.

7. The method for preparing a dental resin block for cutting processing according to claim 1, characterized in that: The thickness of the tooth-colored dental resin powder layer applied on the scallop surface of the gum line in S5 and the thickness of the gum-colored dental resin powder layer applied on the scallop surface of the gum line in S6 are both 1 mm to 3 mm.

8. The method for preparing a dental resin block for cutting processing according to claim 1, characterized in that: The resin powder is one of polymethyl methacrylate and polyetheretherketone.

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