CN219153603U

CN219153603U - Dental orthodontic diaphragm with uneven wall thickness and manufacturing die thereof

Info

Publication number: CN219153603U
Application number: CN202222220702.3U
Authority: CN
Inventors: 张爱琴
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2023-06-09
Anticipated expiration: 2032-08-23

Abstract

The utility model relates to the technical field of dental medical consumables. A dental orthodontic diaphragm with uneven wall thickness and a manufacturing die thereof comprise a diaphragm body, wherein a first thick diaphragm area and a second thick diaphragm area are arranged on the diaphragm body, and the first thick diaphragm area is in a strip arc shape. The second thick diaphragm area is circular and is positioned in the middle of the diaphragm. The first thick film region and the second thick film region are thicker than other film regions, and the first thick film region and the second thick film region are gradually thicker from the respective edges to the center. The positioning point is arranged on the straight line where the center line of the first thick diaphragm area is located and is located near the edge of the diaphragm body. The utility model provides a dental diaphragm with unevenly formed wall thickness according to treatment requirements, which aims to solve the problems that the traditional design diaphragm is too thin on the labial side of the front teeth, too low in correction force, not ideal in correction effect and easy to tear at the too thin position; and the problem of too thick molar position, too large correction force and poor comfort level of patients.

Description

Dental orthodontic diaphragm with uneven wall thickness and manufacturing die thereof

Technical Field

The utility model relates to the technical field of dental medical consumables, in particular to a dental diaphragm.

Background

Currently, dental orthodontic diaphragms are costly to procure, creating a significant economic burden to orthodontic solution suppliers.

The current conventional processing scheme has the following disadvantages: the dental orthodontic film is currently produced mainly by an extrusion process, and then the sheet is cut into various shapes matched with an orthodontic braces forming device, and then the orthodontic braces of a specific customer are customized by the braces forming device. The cutting process generates a lot of leftover materials, which increases cost and environmental pressure.

Although the existing injection molding is a mature process, the technical threshold is relatively low. However, the common injection molding only depends on a single injection molding action to finish the processing of the product, and is used in the aspect of the dental orthodontic film, and the thickness distribution of the orthodontic film is from 0.5 millimeter to 1 millimeter, so that the product is very thin and is difficult to saturate during injection molding; even if the die is full, the product has large internal stress, and in the process of heating and forming the orthodontic tooth socket, the local deformation of the diaphragm is easily caused by uneven internal stress distribution, so that the product cannot be normally used for producing the orthodontic tooth socket.

At present, the traditional diaphragm anterior tooth has too thin labial side, too low correction force, unsatisfactory correction effect and easy tearing at the too thin position; and the problem of poor comfort level of patients due to overlarge molar positions and overlarge correction force. The conventional manufacturing process cannot provide a method capable of precisely controlling the thickness of each portion of the membrane.

Disclosure of Invention

The utility model provides a dental diaphragm with unevenly formed wall thickness according to treatment requirements, which aims to solve the problems that the traditional design diaphragm is too thin on the labial side of the front teeth, too low in correction force, not ideal in correction effect and easy to tear at the too thin position; and the problem of too thick molar position, too large correction force and poor comfort level of patients.

The utility model provides an inhomogeneous wall thickness dental orthodontic diaphragm, includes the diaphragm body, be provided with first thick diaphragm district and second thick diaphragm district on the diaphragm body, first thick diaphragm district is the strip arc.

Further, the second thick diaphragm area is circular and is positioned in the middle of the diaphragm.

Further, the thickness of the first thick film region and the second thick film region is 0.9-0.17 mm thicker than the thickness of the region of the film body except the first thick film region and the second thick film region.

Further, the thickness of the membrane body is 0.5-0.1mm.

Further, the first thick film region and the second thick film region are gradually thicker from their respective edges to the center.

Furthermore, the diaphragm is provided with positioning points so as to be conveniently matched with the 3D dental model for positioning and forming.

Further, the positioning point is arranged on the straight line where the center line of the first thick diaphragm area is located and is located near the edge of the diaphragm body.

Here, the first thick film region corresponds to the front tooth side of the compression mold, and the second thick film is arranged to reduce the internal stress of the film body in the extrusion injection molding process, so as to facilitate the molding of the orthodontic film.

A production process of a dental orthodontic diaphragm with uneven wall thickness comprises the following steps: the method comprises the steps of installing an orthodontic tooth socket die on an injection molding machine with an injection molding extrusion function, injecting molten rubber into the die when an injection molding unit, keeping the die in an incompletely closed state, keeping a certain opening degree of the die, immediately closing a hot runner valve needle after injecting the molten rubber with a set volume into a die cavity of the die, simultaneously, closing the die by the injection molding machine at a set speed and pressure, extruding the molten rubber in the die cavity by a die closing process, continuing to flow until the die cavity is completely filled, keeping the die closing state for a period of time, gradually cooling and solidifying the molten rubber in the die cavity, opening the die at the moment, starting a gas ejection system when the die is opened to a specific position, and ejecting a product out of the die.

Further, the present utility model provides a mold for use in the above process, the orthodontic socket mold comprising a movable mold and a fixed mold, the movable mold being movable toward the fixed mold to be engaged with the fixed mold to define a cavity for molding an orthodontic film, wherein one of the fixed mold and the movable mold has a protruding wall provided around the cavity, the other of the fixed mold and the movable mold has a recess for receiving the protruding wall, the recess and the protruding wall cooperate with each other to seal the cavity in a predetermined incompletely closed mold state when the movable mold is engaged with the fixed mold, the fixed mold being provided with a mold core having a disk shape, the disk being provided with a first groove region and a second groove region, the first groove region being in a stripe-like arc shape.

Further, the second groove area is circular and is positioned in the middle of the mold core.

Further, the thicknesses of the first groove region and the second groove region are 0.9-0.17 mm thinner than the thicknesses of the areas except the first groove region and the second groove region on the wafer.

Further, the first groove region and the second groove region taper from their respective edges to the center. Furthermore, a positioning groove is formed in the mold core, so that the formed membrane after injection molding is matched with the 3D dental model in positioning.

Further, the outer side of the end face of the protruding wall is provided with an annular inclined surface, so that the protruding wall and the concave part can be mutually matched, clamped and positioned to form a seal when the movable die approaches to the fixed film.

Further, the orthodontic shell mold further comprises a hot runner system adapted to inject the sizing material into the cavity, the hot runner system being provided with a needle valve adapted to close a sizing material injection port of the mold for injecting the sizing material and a hydraulic device adapted to control the movement of the needle valve and to keep the needle valve in place. The hot runner system is favorable for avoiding the generation of the glue port and realizing the control of opening and closing the glue injection port.

Further, the hot runner system is used for injecting the sizing material injected from the injection nozzle into the cavity between the fixed die and the movable die. The hot runner system comprises a needle valve and a hydraulic oil cylinder, and the needle valve seals a glue injection port of the fixed die under the pushing of the hydraulic oil cylinder, so that glue in the cavity can be prevented from flowing back.

Further, the protruding wall is provided with a first intermittent portion, the concave portion is provided with a second intermittent portion, and the first intermittent portion and the second intermittent portion form a flash area when the movable die is connected with the fixed die so as to accommodate redundant sizing materials, so that the thickness of the formed orthodontic diaphragm is not influenced by fluctuation of the quantity of injected sizing materials.

Further, an air outlet is further formed in the die cavity of the fixed die 9 and is connected with an air pipe of an air ejection system, and the air ejection system blows air outwards, so that the orthodontic diaphragm formed in the die cavity is ejected out of the die cavity, and traceless demolding is achieved.

The technical scheme adopted by the utility model has the following beneficial effects:

first, the orthodontic film sheet is formed in one step by injection molding, reducing the generation of scrap and the consequent environmental stresses, relative to the production of orthodontic film sheets by extrusion processes.

Secondly, the injection molding extrusion process realizes low internal stress of the diaphragm, avoids problems in the subsequent hot press forming process, can accurately control the wall thickness of the product, and enables the subsequent orthodontic tooth socket to be stably formed.

Thirdly, the gas ejection mode is used, so that appearance defects such as scratches and deformation caused by the mechanical ejection process are avoided.

Fourth, the die and the process scheme provided by the utility model are suitable for producing common materials at present, such as: TPU, PETG/PCTG, PA have solved extrusion molding to different materials, to the great problem of difference of equipment requirement.

The injection extrusion die adopted by the utility model can be provided with a single-point or multi-point hot runner system, the hot runner adopts a needle valve structure, and the surfaces of the needle valve and the cavity are kept flush, so that the surface of a final product is kept flat. The size limiting structure is arranged around the die cavity, so that product flash and uneven filling caused by the extrusion process can be prevented; meanwhile, a flash structure is arranged at a specific position, so that possible redundant materials can be discharged out of the cavity, and accurate control of the wall thickness of the product is ensured. Meanwhile, the air ejection system is arranged at the back of the sprue gate of the hot runner to break the vacuum between the product and the mold, so that the product can be easily taken out by a mechanical arm or manually, and can be directly blown out through air.

On the other hand, through the structural design of mold core, the thickness of just abnormal diaphragm different positions can be accurately controlled, the inhomogeneous manufacturing of thickness of whole just abnormal diaphragm is realized. It is possible to customize the non-uniform wall thickness membrane for different teeth and locations. The injection molding extrusion process is used for realizing the injection molding production of the thin-wall orthodontic diaphragm. The technical threshold of the production of the dental orthodontic diaphragm is reduced, the localization is possible, and the market popularization speed of the transparent orthodontic tooth socket is accelerated.

Drawings

FIG. 1 is a schematic diagram of a membrane structure according to an embodiment of the present utility model.

FIG. 2 is a schematic view of a mold core according to an embodiment of the present utility model.

FIG. 3 is a perspective view of a mold cavity of a mold side mold in accordance with an embodiment of the present utility model.

Fig. 4 is a projection view of a movable mold side mold cavity according to an embodiment of the present utility model.

Fig. 5 is a block diagram of a mold according to an embodiment of the present utility model.

Detailed Description

The utility model provides an inhomogeneous wall thickness dental orthodontic diaphragm, includes diaphragm body 5, be provided with first thick diaphragm district 6 and the thick diaphragm district 7 of second on the diaphragm body 5, first thick diaphragm district 6 is the strip arc.

The second thick diaphragm area 7 is circular and is positioned in the middle of the diaphragm 5.

The thickness of the first thick film area 6 and the second thick film area 7 is 0.9-0.17 mm thicker than the area of the film body except the first thick film area and the second thick film area.

The thickness of the membrane body 5 is 0.5-0.1mm.

The first and second

thick film regions

6, 7 become thicker gradually from their respective edges to the center.

The membrane 5 is provided with a positioning point 8 so as to be conveniently matched with the 3D dental model for positioning and forming.

The positioning point 8 is arranged on the straight line where the center line of the first thick film area 7 is located and is positioned near the edge of the film body 5.

Here, the first thick film region 6 corresponds to the front tooth side of the die, and the second thick film 7 is disposed to reduce the internal stress of the film body 5 during the extrusion injection molding process, so as to facilitate the orthodontic film forming.

The present utility model provides a die for use in the above process, the orthodontic tooth socket die comprising a movable die 13 and a fixed die 12, the movable die 13 being movable toward the fixed die 12 to engage with the fixed die 12 to define a cavity 14 for molding an orthodontic film, wherein one of the fixed die 12 and the movable die 13 has a protruding wall 11 provided around the cavity 14, the other of the fixed die 12 and the movable die 13 has a recess for receiving the protruding wall, the recess and the protruding wall 11 cooperate with each other to seal the cavity in a predetermined incompletely clamped state when the movable die 13 is engaged with the fixed die 12, the fixed die 12 is provided with a die core 1, the die core 1 is in a circular sheet shape, the circular sheet is provided with a first groove region 2 and a second groove region 3, and the first groove region 2 is in a strip-like arc shape.

The second groove area 3 is round and is positioned in the middle of the mold core 1.

The thickness of the first groove region 2 and the second groove region 3 is 0.9-0.17 mm thinner than the area of the wafer except the first groove region and the second groove region. The first and second groove regions 2, 3 taper from their respective edges to the center.

The mold core 1 is provided with a positioning groove 4 so as to facilitate the positioning and matching positioning of a diaphragm 5 formed after injection molding and a 3D dental model.

The outer side of the end surface of the protruding wall 11 is provided with an annular inclined surface, so that the protruding wall and the concave part can be mutually matched, clamped and positioned to form a seal when the movable die 13 approaches to the fixed die 12.

The orthodontic shell mould further comprises a hot runner system 15 adapted to inject the glue into the mould cavity, the hot runner system 15 being provided with a needle valve adapted to close the glue injection port of the mould for injecting the glue and hydraulic means adapted to control the movement of the needle valve and to keep the needle valve in position. The hot runner system 15 helps to avoid the generation of glue ports and control the opening and closing of the glue injection ports.

The hot runner system 15 is used for injecting the sizing material injected from the injection nozzle into the cavity 14 between the fixed die 12 and the movable die 13 through the hot runner system 15. The hot runner system 15 comprises a needle valve and a hydraulic oil cylinder, and the needle valve seals a glue injection port of the fixed die under the pushing of the hydraulic oil cylinder, so that glue in the cavity can be prevented from flowing back.

The protruding wall 11 is provided with a first discontinuity and the recess is provided with a second discontinuity, the first discontinuity and the second discontinuity forming a flash zone when the movable mold is engaged with the fixed mold to accommodate the excess glue, thereby ensuring that the thickness of the formed orthodontic film is not affected by the fluctuation of the amount of injected glue.

An air outlet 10 is also arranged on the cavity of the fixed die 12, an air pipe of an air ejection system of the air outlet 10 is connected,

the gas ejection system blows outwards, so that the orthodontic diaphragm formed in the cavity is ejected out of the cavity, and traceless demolding is achieved.

Thirdly, the gas ejection mode is used, so that appearance defects such as scratches and deformation caused by the mechanical ejection process are avoided. Fourth, the die and the process scheme provided by the utility model are suitable for producing common materials at present, such as: TPU, PETG/PCTG, PA have solved extrusion molding to different materials, to the great problem of difference of equipment requirement.

Claims

1. The utility model provides an inhomogeneous wall thickness dental orthodontic diaphragm, includes diaphragm body, its characterized in that: the diaphragm body is provided with a first thick diaphragm area and a second thick diaphragm area, the first thick diaphragm area is in a strip arc shape, and the first thick diaphragm area and the second thick diaphragm area are gradually thickened from the respective edges to the center.

2. The non-uniform wall thickness orthodontic diaphragm of claim 1, wherein: the second thick diaphragm area is circular and is positioned in the middle of the diaphragm.

3. The non-uniform wall thickness orthodontic diaphragm of claim 1, wherein: the thickness of the first thick film area and the second thick film area is 0.9-0.17 mm thicker than the area of the film body except the first thick film area and the second thick film area.

4. The non-uniform wall thickness orthodontic diaphragm of claim 1, wherein: and the diaphragm is provided with a positioning point.

5. The non-uniform wall thickness dental orthodontic diaphragm of claim 4, wherein: the positioning point is arranged on the straight line where the center line of the first thick diaphragm area is located and is located near the edge of the diaphragm body.

6. A manufacturing die for a dental orthodontic diaphragm having a non-uniform wall thickness, comprising a movable die and a fixed die, the movable die being movable toward the fixed die to engage the fixed die to define a cavity for molding the orthodontic diaphragm, characterized in that: one of the fixed die and the movable die is provided with a protruding wall arranged around the cavity, the other one of the fixed die and the movable die is provided with a concave part for receiving the protruding wall, the concave part and the protruding wall are mutually matched when the movable die is engaged with the fixed die so as to seal the cavity in a preset incomplete die-closing state, the fixed die is provided with a die core, the die core is in a disc shape, the disc is provided with a first groove area and a second groove area, and the first groove area is in a strip arc shape.

7. The manufacturing die for the dental orthodontic diaphragm with the uneven wall thickness according to claim 6, wherein: the second groove area is circular and is positioned in the middle of the mold core, the thickness of the first groove area and the second groove area is thinner than that of the area except the first groove area and the second groove area on the wafer, and the first groove area and the second groove area are gradually thinned from the respective edges to the center.

8. The manufacturing die for the dental orthodontic diaphragm with the uneven wall thickness according to claim 7, wherein: the outer side of the end face of the protruding wall is provided with an annular inclined surface, so that the protruding wall and the concave part can be mutually matched, clamped and positioned to form a seal when the movable die approaches to the fixed film.

9. The manufacturing die of the dental orthodontic diaphragm with the uneven wall thickness according to claim 8, wherein: and an air outlet is further arranged on the die cavity of the fixed die and is connected with an air pipe of the air ejection system.