CN218606898U - A mould and lower tooth jaw subassembly for upper jaw frame in-process - Google Patents

Abstract

The application discloses a mould and lower tooth jaw subassembly for upper jaw frame in-process, wherein the mould is used for making lower tooth jaw gypsum base, and the mould includes: a mold body having a cavity with an opening; the protruding blocking part is arranged on the inner wall of the cavity and protrudes out of the surface of the inner wall of the cavity; the convex baffle part divides the cavity into an upper cavity and a lower cavity, one end of the upper cavity is communicated with the opening, and the other end of the upper cavity is communicated with the lower cavity; the die cavity has preset degree of depth and is used for holding the gypsum material, goes up the die cavity and is used for holding down the tooth jaw model, and the jaw plane of tooth jaw model flushes with the top surface of mould body down. According to the method, the lower dental gypsum base can be quickly manufactured through the mold and is connected with the lower dental model to form the lower dental assembly, the jaw plane of the lower dental model is predetermined through the preset depth of the cavity, and the alignment precision is high; and through forming concave part on the gypsum base of the jaw, the convenient snatching is easy to operate, and the efficiency is higher.

Description

A mould and lower tooth jaw subassembly for upper jaw frame in-process

Technical Field

The application relates to the technical field of oral restoration, in particular to a mold used in an upper jaw frame process and a lower dental component.

Background

In the process of correcting and treating teeth, a mold taking tool, plaster and other materials are needed to be used for transferring the situations of oral cavity biting, dentition and the like to the outside of the mouth, then restorations such as an appliance and a retainer are manufactured on the transferred oral cavity plaster model, and the biting situations of the upper dentition and the lower dentition need to be restored on a jaw frame in the process.

At present, the prior art often adopts the gypsum model to be used for supporting the tooth jaw model, for example, make the tooth jaw model earlier, later stack the gypsum in the bottom of tooth jaw model, it is fixed to support through the gypsum of stacking at the bottom, place the tooth jaw model to the jaw plane position through the gypsum promptly, because the stack height of this in-process gypsum need through artifical range estimation and manual positioning, its defect lies in, artifical range estimation and the jaw plane position of manual location tooth jaw model, lead to consuming long time and the error is great, and then influence the production quality and the production efficiency of gypsum model.

Therefore, the prior art is in need of improvement.

SUMMERY OF THE UTILITY MODEL

An object of the application is to provide a mould and lower tooth jaw subassembly for upper jaw frame in-process, aim at solving among the prior art and stack the gypsum in the bottom of tooth jaw model, owing to need through artifical range estimation and manual positioning, and then lead to long and the great technical problem of error of consuming time.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

the application provides a mould for maxilla frame in-process for tooth jaw gypsum base under the preparation, wherein the mould includes: a mold body having a cavity with an opening;

the convex blocking part is arranged on the inner wall of the cavity and protrudes out of the surface of the inner wall of the cavity;

the convex baffle part divides the cavity into an upper cavity and a lower cavity, one end of the upper cavity is communicated with the opening, and the other end of the upper cavity is communicated with the lower cavity;

the die cavity has preset degree of depth and is used for holding the gypsum material, goes up the die cavity and is used for holding down the tooth jaw model, and the jaw plane of tooth jaw model flushes with the top surface of mould body down.

In one embodiment, a side surface of the protruding baffle portion facing the upper cavity is arc-shaped, so that the inner wall of the upper cavity is an arc-shaped inner wall.

In one embodiment, a side surface of the protruding baffle portion facing the lower cavity is arc-shaped, so that the inner wall of the lower cavity is an arc-shaped inner wall.

In one embodiment, the mold body is a flexible silicone mold body.

In one embodiment, the mold further comprises a bottom plate disposed at the bottom of the lower cavity and used for carrying the gypsum material.

In one embodiment, the base plate comprises:

the bottom plate body is detachably arranged in the lower cavity;

the magnetic part is arranged on the bottom plate body.

In one embodiment, a first groove is formed in the bottom plate body, and the first groove is arranged on the surface of the bottom plate body facing the upper cavity;

the magnetic part is embedded in the first groove.

In one embodiment, the bottom plate body is further provided with a connecting groove, and the connecting groove is located on the surface of the bottom plate body facing the upper cavity.

In one embodiment, the bottom plate body is a plastic body.

Based on the same concept, the present application also proposes a lower dental assembly for use in a maxillofacial framework procedure, the lower dental assembly comprising: a lower jaw plaster base and a lower jaw model; lower tooth jaw gypsum base adds the gypsum material through as above mould and carries out the shaping, lower tooth jaw model through arrange the gypsum material in with lower tooth jaw gypsum base fixed connection.

The application provides a beneficial effect that is used for mould and lower tooth jaw subassembly of jaw frame in-process lies in at least: make down tooth jaw plaster base fast enough through the mould to form complete lower tooth jaw subassembly behind the tooth jaw model under the in-process of tooth jaw plaster base is connected down in the shaping, and the jaw plane's of lower tooth jaw model in the complete lower tooth jaw subassembly height just equals the preset degree of depth of die cavity. In the process of the upper jaw frame, the manufactured lower dental jaw assembly is placed on the jaw frame, so that the jaw plane just reaches a preset position, and the height adjustment caused by manual gypsum accumulation is avoided; the jaw plane of lower tooth jaw model carries out predetermined through predetermineeing highly like this, makes the jaw plane's of lower tooth jaw model height more accurate, and its height directly matches with the jaw frame, has avoided carrying out jaw plane's measurement and adjustment again through the mode of artifical pad gypsum and the mode of artifical measurement to realize the advantage that the precision is high, efficient. And because the convex baffle part is arranged in the mould body, the middle position of the dental jaw plaster base formed in the upper cavity and the lower cavity in the height direction can be inwards concave towards the middle to form an inner concave part, and the shape of the middle is like a waist. Through the interior concave part on the tooth jaw plaster base for conveniently snatching, the in-process of carrying out jaw frame technology on the jaw frame is convenient for get and is put, its simple structure, the practicality is strong.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of a mold body according to an embodiment of the present disclosure;

fig. 2 is a schematic view of an assembly structure of a mold body and a bottom plate according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a mold used in a maxillary rack process according to an embodiment of the present application;

FIG. 4 is a schematic top view of a base plate according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of a dental plaster base provided by an embodiment of the present application;

fig. 6 is a schematic view of an assembly structure of the jaw frame and the lower dental jaw provided by the embodiment of the application.

Wherein, in the figures, the respective reference numerals:

10. a lower dental jaw assembly; 100. a mold body; 110. an opening; 120. an upper cavity; 130. a lower cavity; 140. a protruding stopper; 200. a base plate; 210. a bottom plate body; 220. a first groove; 230. a connecting groove; 300. a magnetic member; 400. a dental jaw plaster base; 410. an inner concave portion; 500. a lower dental model; 600. a jaw frame.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly or indirectly secured to the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element. The terms "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positions based on the orientations or positions shown in the drawings, and are for convenience of description only and not to be construed as limiting the technical solution. The terms "first", "second" and "first" are used merely for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "plurality" is two or more unless explicitly defined otherwise.

Referring to fig. 1 and 5, the present embodiment provides a mold for use in a maxilla rack process, for manufacturing a lower dental cast base 400, wherein the mold for use in the maxilla rack process specifically includes: a mold body 100, and a protruding stop 140. The mold body 100 is provided therein with a cavity having an opening 110, a protruding stopper 140 is provided on an inner wall of the cavity and protrudes from an inner wall surface of the cavity, thereby dividing the cavity into an upper cavity 120 and a lower cavity 130, the opening 110 is provided on a top surface of the mold body 100, the upper cavity 120 is located at an upper portion, and the lower cavity 130 is located at a lower portion. The upper cavity 120 has one end communicating with the opening 110 and the other end communicating with the lower cavity 130. The cavity has a preset depth and is used for accommodating gypsum materials, and the upper cavity 120 is used for accommodating the lower jaw model 500; when the gypsum material is formed in the cavity, the prefabricated lower jaw model 500 is placed in the upper cavity 120 and connected to the gypsum material, after the gypsum material is formed, the part of the gypsum material forms the lower jaw gypsum base 400, and the lower jaw model 500 can be integrally fixed on the top of the lower jaw gypsum base 400 to form the complete lower jaw assembly 10. In the process of forming the plaster material, the lower jaw model 500 can be lightly pressed down to the jaw plane flush with the upper surface of the mold body 100 by using a glass plate, so that the jaw plane of the lower jaw model 500 is flush with the top surface of the mold body 100 after the complete lower jaw assembly 10 is formed. It is easy to think that the mould can also be used for the plaster base of the upper jaw.

In the process of orthodontic treatment of teeth, it is necessary to use a model-taking tool, plaster and other materials to transfer the conditions of oral cavity biting, dentition and the like to the outside of the mouth, and then to manufacture restorations such as an appliance, a retainer and the like on the transferred oral cavity plaster model, and in the process, it is necessary to restore the biting conditions of upper and lower dentitions on the jaw frame 600, and the process is called a jaw frame process (maxillary frame process).

The working principle of the present embodiment for the process of the maxilla rack is as follows: in the process of applying the mold to the maxilla frame, please refer to fig. 5 and 6, the height of the mold body 100 and the depth of the cavity, for example, the depth of the cavity is 50mm, the preset depth of the cavity is consistent with the distance of the position of the jaw plane required to be reached on the maxilla frame 600 (for example, the height of the position of the jaw plane required to be reached is 50 mm), then the lower jaw gypsum base 400 is formed by filling the upper cavity 120 and the lower cavity 130 with the gypsum material through the opening 110, the lower jaw model 500 is placed in the upper cavity 120 before the gypsum material is not fixed, so that the lower jaw model 500 is fixed on the lower jaw gypsum base 400, the lower jaw gypsum base 400 and the lower jaw model 500 are integrally formed to form the lower jaw assembly 10, then the lower jaw assembly 10 is placed on the maxilla frame 600 to detect whether the occlusal plane is correct, then the occlusion relationship is determined, the maxilla frame process is completed, and then the mandibular transfer between the maxilla and the maxilla is completed. The lower dental gypsum base 400 is quickly manufactured through a mold, the lower dental model 500 is connected in the process of forming the lower dental gypsum base 400 to form the complete lower dental assembly 10, and the height of the jaw plane of the lower dental model 500 in the complete lower dental assembly 10 is just equal to the preset depth of the cavity. In the process of the maxilla rack, the manufactured lower dental component 10 is placed on the maxilla rack 600, so that the jaw plane just reaches the preset position, and the height adjustment caused by manual gypsum accumulation is avoided; the jaw plane of the lower jaw model 500 is predetermined by the preset height, so that the height of the jaw plane of the lower jaw model 500 is more accurate, the height of the lower jaw model is directly matched with the jaw frame 600, and the jaw plane is prevented from being measured and adjusted by a manual plaster padding mode and a manual measurement mode, so that the advantages of high precision and high efficiency are realized. And because the mold body 100 is provided with the protruding stopper 140, the middle position of the dental gypsum base 400 formed in the upper cavity 120 and the lower cavity 130 in the height direction is recessed toward the middle to form a recessed portion 410, like a waist shape, and the periphery is formed into a recessed structure at a convergent angle of an inclination angle of about 70 ° (or an included angle of a tangent line at the junction of arc-shaped surfaces of the recessed portion is about 70 °). The inner concave part 410 on the dental jaw plaster base 400 is used for facilitating grabbing, and the process of the upper jaw rack process on the jaw rack 600 is convenient to take and place, simple in structure and high in practicability.

The whole process of the upper jaw frame comprises the following steps: the height 50mm of the jaw plane of the lower dental model in the complete lower dental assembly is just equal to the preset depth 50mm of the cavity. In the technical process of the upper jaw frame, the manufactured lower tooth jaw assembly is placed on the jaw frame, so that the jaw plane of the lower tooth jaw just reaches a preset position (a height line limited by a rubber band on the jaw frame), and therefore, the height adjustment caused by manual gypsum accumulation can be avoided; the jaw plane of tooth jaw model carries out predetermined through predetermineeing highly like this, makes the height of the jaw plane of tooth jaw model more accurate down to reach the highly unified standardization of standard in the upper jaw frame in-process, accord with the requirement in the standard in the field, its height and jaw frame direct matching have avoided carrying out jaw plane's measurement and adjustment again through the mode of artifical pad gypsum and the mode of artifical measurement. No matter how high the lower dental model is obtained in advance (because the height of the lower dental model is not uniform, the height of the lower dental model is random because the height of the lower dental model taken by a clinician is not uniform), the lower dental model is placed in a cavity of the mold in a flat manner, and the height of the plaster base of the lower dental model is controlled to enable the jaw plane of the lower dental model to be flush with the top surface of the mold body. Therefore, the formed complete lower dental component can ensure that the height of the jaw plane of the unified lower dental model is 50mm, and can form the function of automatic positioning at one time. The standard height of the whole jaw frame is 110mm, and since the height of the lower dental component formed in this embodiment is 50mm, the standard height of the upper jaw model is naturally kept limited to 60 mm. Thereby establishing the execution basis of the production standard of the constant proportion value between the jaw planes of the upper jaw and the lower jaw, and being more beneficial to the establishment of standardization.

Therefore, the effect of the mold for the maxilla rack process proposed by the embodiment is as follows: the lower jaw plaster base 400 is quickly manufactured through a mold, the outer wall of the lower jaw plaster base 400 is inwards concave to form an inwards concave part 410, and a user can conveniently grab the inwards concave part 410; the jaw plane of the lower tooth jaw model 500 is predetermined by the preset height, so that the height of the jaw plane of the lower tooth jaw model 500 is more accurate, the height of the lower tooth jaw model is directly matched with the jaw frame 600, and the jaw plane is prevented from being measured and adjusted again by a manual plaster filling mode and a manual measurement mode, so that the advantages of high precision and high efficiency are realized.

Referring to fig. 1, in the specific structure of this embodiment, a side surface of the protruding stopping portion 140 facing the upper cavity 120 is arc-shaped, so that an inner wall of the upper cavity 120 is an arc-shaped inner wall, and the upper side surface of the protruding stopping portion 140 is arc-shaped, so that the surface of the protruding stopping portion 140 is in direct contact with the inner wall of the upper cavity 120, and the surface of the upper cavity 120 can be kept smooth. Moreover, the cross section of the upper cavity 120 is trumpet-shaped, and the end of the upper cavity 120 close to the lower cavity 130 is a smaller end, so that the molded lower dental gypsum base 400 can be conveniently taken out. The surface of one side of the protruding blocking part 140 facing the lower cavity 130 is arc-shaped, so that the inner wall of the lower cavity 130 is arc-shaped, and the surface of the protruding blocking part 140 is configured to be arc-shaped, so that the surface of the protruding blocking part 140 is in direct contact with the inner wall of the lower cavity 130, and the surface of the lower cavity 130 can be kept smooth. The cross section of the lower cavity 130 is also trumpet-shaped, and one end of the lower cavity 130 close to the upper cavity 120 is a smaller end; the molded lower jaw plaster base 400 can be conveniently taken out. And through setting up protruding fender portion 140, not only make and form interior concave part 410 and can facilitate the use on the lower tooth jaw gypsum base 400 that forms, can also reduce the gypsum material, reduce the manufacturing cost of lower tooth jaw gypsum base 400, its simple structure, the production of being convenient for, the practicality is strong.

The mold body 100 in this embodiment is made of a flexible material. Thereby make mould body 100 can be out of shape after exerting external force, can pour into the gypsum through opening 110 to upper cavity 120 and lower cavity 130 like this and form lower tooth jaw gypsum base 400, later be fixed in lower tooth jaw model 500 on lower tooth jaw gypsum base 400, make lower tooth jaw gypsum base 400 and tooth jaw model integrated into one piece, treat that lower tooth jaw gypsum base 400 solidifies the back, can have flexible mould body 100 through the upset, specifically if upset opening 110 backward, make lower tooth jaw gypsum base 400 break away from opening 110, and then make mould body 100 and lower tooth jaw gypsum base 400 separate, moreover, the steam generator is simple in structure, the operation is also simple, and is low in cost, and easy realization. The flexible material is in many forms and may be, for example, a flexible silicone rubber. The mold body 100 is made of flexible silicone. After the lower jaw gypsum base 400 is solidified in the mold body 100, the opening 110 is turned backwards, so that the lower jaw gypsum base 400 comes out of the opening 110, and the lower jaw gypsum base is simple in structure, simple to operate, low in cost and easy to implement.

Referring to fig. 2, 3 and 4, in the specific structure of this embodiment, the mold used in the process of the maxilla rack further includes a bottom plate 200, and the bottom plate 200 is disposed at the bottom of the lower cavity 130 and used for bearing the gypsum material. The lower jaw gypsum base 400 is formed on the bottom plate 200, and the bottom of the formed lower jaw gypsum base 400 can be supported by the bottom plate 200, so that the structural strength of the whole lower jaw gypsum base 400 is enhanced. The lower jaw plaster base 400 is made more stable.

The bottom plate 200 in this embodiment specifically includes: the bottom plate comprises a bottom plate body 210 and a magnetic element 300, wherein the bottom plate body 210 is detachably arranged in the lower cavity 130, and the magnetic element 300 is arranged on the bottom plate body 210. Through setting up bottom plate body 210 and magnetism piece 300 of inhaling, can directly arrange lower tooth jaw gypsum base 400 in jaw frame 600 on, lower tooth jaw gypsum base 400 can be dismantled with jaw frame 600 through the magnetism of magnetism piece 300 of inhaling and be connected, can conveniently descend tooth jaw gypsum base 400 to dismantle and install on jaw frame 600.

In this embodiment, the bottom plate body 210 is provided with a first groove 220, the first groove 220 is disposed on the surface of the bottom plate body 210 facing the upper cavity 120, and the magnetic member 300 is embedded in the first groove 220. Through setting up first recess 220, can inhale magnetism piece 300 more convenient inlay establish to bottom plate body 210 on, simplified the connection structure of inhaling piece 300 and bottom plate body 210.

In this embodiment, the bottom plate body 210 is embedded in the bottom of the lower cavity 130, and the magnetic member 300 is embedded in the first groove 220. When the gypsum material is poured into the mold body 100, the gypsum material and the bottom plate body 210 are integrally formed, that is, the gypsum material and the bottom plate body 210 are fixedly formed. The lower bottom surface of lower tooth jaw gypsum base 400 after the bottom plate 200 is as the shaping, because bottom plate 200 levels itself, can be different the bottom of repairing lower tooth jaw gypsum base 400, can be in order to directly arrange lower tooth jaw gypsum base 400 on jaw frame 600, can simplify production flow, improve production efficiency to lower tooth jaw gypsum base 400 can be dismantled through magnetism with jaw frame 600 and be connected, can conveniently descend the dismantlement and the installation of tooth jaw gypsum base 400.

The bottom plate body 210 is provided with a plurality of connecting grooves 230, and the connecting grooves 230 are used for being connected with gypsum in a meshing manner and can strengthen the connection between the gypsum and the bottom plate body 210.

The bottom plate body 210 in this embodiment is attached to the inner wall of the cavity of the mold body 100. The bottom plate body 210 is wrapped and attached by the inner wall of the mold body 100, when gypsum materials are poured into the cavity of the mold body 100, the bottom plate body 210 is fixedly connected with the gypsum materials, the bottom plate body 210 is attached to the inner wall of the mold body 100, therefore, gypsum overflowing between the bottom plate body 210 and the mold body 100 can be avoided, and subsequent gypsum overflowing during finishing can be avoided.

The magnetic attraction member 300 in this embodiment includes one of the following structures: magnets or magnetic metals. For example, the magnetically attractive element 300 may be a magnet, or alternatively, the magnetically attractive element 300 may be a magnetic metal, such as iron or stainless steel, etc. The material of the bottom plate body 210 in this embodiment is made of plastic material. For example, the bottom plate 210 is made of plastic material, which is low in cost and easy to manufacture.

Referring to fig. 2, 3 and 4, in the specific structure of the present embodiment, the outline of the opening 110 is substantially the same as the outline of the gum. The lower jaw plaster base 400 approximately consistent with the outline of the gum can be conveniently formed, the simulation effect of occlusion of the upper jaw and the lower jaw is achieved, on one hand, the precision of the occlusion simulation test of the upper jaw and the lower jaw can be improved, on the other hand, plaster materials can be saved, and the production cost is reduced.

Referring to fig. 1 and 5, based on the same concept, the present embodiment further provides a lower dental component 10 for a maxillofacial framework process, wherein the lower dental component 10 includes: a lower dental gypsum base 400 and a lower dental model 500. The lower jaw gypsum base 400 is formed by adding gypsum material into the mold, and the lower jaw model 500 is fixedly connected with the lower jaw gypsum base 400 by being placed in the gypsum material.

The upper jaw frame process method after the lower jaw component produced by adopting the die in the embodiment comprises the following steps:

and S100, fixing the bottom plate on a mold.

In the specific process, a bottom plate is placed in a lower cavity in the die body.

And S200, filling gypsum materials.

In the concrete process, the unmolded gypsum material is poured into the cavity in the die body, so that the lower cavity and part of the upper cavity are filled with the gypsum material.

And step S300, putting the lower dental model, enabling a jaw plane of the lower dental model to be flush with the upper surface of the mold, and determining an occlusal plane.

In the concrete process, when the white gypsum material is not solidified, the lower jaw model which is manufactured in advance is arranged on the white gypsum material, the lower jaw model can be slightly pressed downwards to the upper surface edge of the jaw plane and the mould to be flushed by using a glass plate, and the white gypsum material overflowing the mould is scraped.

And S400, after the gypsum material is solidified, forming the lower jaw assembly by the dental gypsum base and the lower jaw model.

And S500, placing the lower dental component on a jaw frame to enable the jaw plane of the upper dental model and the jaw plane of the lower dental model of the lower dental component to be consistent with the jaw plane position preset on the jaw frame.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. A mould for use in a maxillofacial frame process for making a lower dental cast base, the mould comprising: a mold body having a cavity with an opening;

the protruding blocking part is arranged on the inner wall of the cavity and protrudes out of the surface of the inner wall of the cavity;

the convex baffle part divides the cavity into an upper cavity and a lower cavity, one end of the upper cavity is communicated with the opening, and the other end of the upper cavity is communicated with the lower cavity;

the upper cavity is used for accommodating a lower jaw model, and a jaw plane of the lower jaw model is flush with the top surface of the die body.

2. The mold for use in a maxillary frame of claim 1 wherein a side surface of the protruding barrier portion facing the upper cavity is curved so that an inner wall of the upper cavity is a curved inner wall.

3. The mold for use in a maxillary mounting process according to claim 2, wherein a side surface of the protruding stopper facing the lower cavity is curved such that an inner wall of the lower cavity is a curved inner wall.

4. The die for use in a maxillary scaffolding process according to claim 1, wherein the die body is a flexible silicone die body.

5. The mold for use in a maxillary shelving of any one of claims 1 to 4, wherein the mold further comprises a bottom plate provided at a bottom of the lower cavity and adapted to carry gypsum material.

6. The mold for use in a maxilla rack process as claimed in claim 5, wherein the base plate comprises:

the bottom plate body is detachably arranged in the lower cavity;

the magnetic attraction piece is arranged on the bottom plate body.

7. The mold for use in a maxilla rack process as claimed in claim 6, wherein the base plate body is provided with a first groove, the first groove being disposed on a surface of the base plate body facing the upper cavity;

the magnetic part is embedded in the first groove.

8. The mold for maxilla rack process as claimed in claim 7, wherein the bottom plate body further comprises a connecting groove, the connecting groove is located on the surface of the bottom plate body facing the upper cavity.

9. The mold for use in a maxilla rack process as claimed in claim 6, wherein the base plate body is a plastic body.

10. A lower dental assembly for use in a maxillo-shelf procedure, the lower dental assembly comprising: a lower jaw plaster base and a lower jaw model; the lower dental gypsum base is formed by adding gypsum material into the mold according to any one of claims 1 to 9, and the lower dental model is fixedly connected with the lower dental gypsum base by being placed in the gypsum material.

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