CN110115637B - Dental prosthesis casting method based on peek material - Google Patents
Dental prosthesis casting method based on peek material Download PDFInfo
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- CN110115637B CN110115637B CN201910512017.8A CN201910512017A CN110115637B CN 110115637 B CN110115637 B CN 110115637B CN 201910512017 A CN201910512017 A CN 201910512017A CN 110115637 B CN110115637 B CN 110115637B
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- 238000005266 casting Methods 0.000 title claims abstract description 142
- 239000000463 material Substances 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000004512 die casting Methods 0.000 claims abstract description 36
- 239000001993 wax Substances 0.000 claims abstract description 24
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 239000012188 paraffin wax Substances 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000000155 melt Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000007769 metal material Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 238000009750 centrifugal casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000007886 mutagenicity Effects 0.000 description 1
- 231100000299 mutagenicity Toxicity 0.000 description 1
- 231100001083 no cytotoxicity Toxicity 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
- A61C5/70—Tooth crowns; Making thereof
- A61C5/77—Methods or devices for making crowns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process
- B29C33/3842—Manufacturing moulds, e.g. shaping the mould surface by machining
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Epidemiology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Dentistry (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dental Prosthetics (AREA)
Abstract
The invention discloses a dental prosthesis casting method based on a peek material, which comprises the following steps: manufacturing a wax pattern of the prosthesis; step two: embedding the wax pattern, wherein an embedding base support, an embedding cylinder and a backing ring are adopted; step three: roasting the embedded casting mold until the wax pattern and the paraffin casting channel are completely combusted and volatilized to form a casting mold cavity; step four: reducing the roasting temperature to 400 ℃, and putting casting materials into the casting mould cavity from the opening of the casting mould cavity for 20 min; step five: transferring the casting mold to a die casting machine for die casting; the die casting machine includes first cylinder end and second cylinder end, the coaxial sliding connection in first cylinder end of second cylinder end, the die casting machine is including being used for driving the actuating mechanism of first cylinder end, second cylinder end towards the motion of casting mould. The method can effectively improve the casting quality of the cast prosthesis.
Description
Technical Field
The invention relates to the technical field of dental prosthesis manufacturing, in particular to a dental prosthesis casting method based on a peek material.
Background
peek (polyetheretherketone) has been successfully used in the human medical field for many years as a biologically inert material. In the field of dental medicine, BioHPP (high performance polymer, manufactured by Bredet, Germany) is becoming popular in the industry as a semi-crystalline thermoplastic peek (polyetheretherketone) -based ceramic-reinforced high performance polymer having excellent biocompatibility, no effect, no cytotoxicity, mutagenicity, carcinogenicity, and the like.
However, in the process of casting the dental crown, unlike the traditional metal material casting, the metal material can be trimmed in the forms of later welding and the like when shrinkage, casting unevenness and the like exist in the casting process, but the peek material cannot be repaired in the later period, so that the requirement on the casting process is higher.
The existing dental crown casting generally comprises the steps of manufacturing a wax pattern, embedding the wax pattern by adopting an embedding material, reserving a casting channel, roasting the embedding material to volatilize the wax pattern to form a casting cavity, finally melting the casting material, injecting the molten casting material into the casting cavity, cooling to obtain a casting blank, and finishing casting. During the casting process, cooling shrinkage of the casting material is almost inevitable, and uneven shrinkage easily causes defects such as unsatisfactory molding effect or unsatisfactory hardness and density after molding. In the prior art, the existing problems cannot be well solved by common centrifugal casting or vacuum casting, or the problems need to be solved by a more precise casting instrument, but the high-precision instrument and equipment are not expensive and highly depend on import, so that the high-precision casting and vacuum casting cannot be adopted by common small and medium-sized enterprises.
Therefore, the invention aims to solve the problem of developing a method which can effectively improve the quality of the cast prosthesis and does not depend on a high-precision instrument.
Disclosure of Invention
The invention aims to provide a dental prosthesis casting method based on a peek material, which can effectively improve the quality of a cast prosthesis without depending on a high-precision instrument, and has lower use cost.
The above object of the present invention is achieved by the following technical solutions: a dental prosthesis casting method based on a peek material comprises the following steps,
the method comprises the following steps: manufacturing a wax pattern of the prosthesis;
step two: embedding the wax pattern, wherein the embedding comprises an embedding base support, an embedding cylinder and a backing ring, the embedding base support comprises a circular base, the edge of the circular base is provided with a convex edge extending axially, the axis of the circular base is provided with a bulge extending towards the convex edge in the extending direction, and the bulge comprises a first cylindrical part connected with the circular base, a second cylindrical part coaxially connected with the first cylindrical part and a hemispherical part coaxially connected with the second cylindrical part; the diameter of the second cylindrical part is equal to that of the hemispherical part and is smaller than that of the first cylindrical part; when embedding, connecting a paraffin casting channel on the wax pattern, and connecting the other end of the paraffin casting channel to the top end of the hemispherical part; then the backing ring is coaxially sleeved on the second cylindrical part and supported and placed on a step surface formed between the first cylindrical part and the second cylindrical part; clamping one end of the embedding cylinder on the inner wall of the convex edge, filling an embedding material in the embedding cylinder, and taking down the embedding base after the embedding material is solidified;
step three: roasting the embedded casting mold at 880 ℃ for 1.5h until the wax pattern and the paraffin casting channel are completely combusted and volatilized to form a casting mold cavity; the opening of the casting mold cavity comprises a first cylindrical cavity formed by replacing the first cylindrical part during embedding, a second cylindrical cavity formed by replacing the second cylindrical part and a hopper cavity formed by replacing the hemispherical part;
step four: reducing the roasting temperature to 400 ℃, and putting casting materials into the casting mould cavity from the opening of the casting mould cavity for 20 min; the liquid level of the molten liquid after the casting material is melted is required to be arranged in a first cylindrical cavity;
step five: transferring the casting mold to a die casting machine for die casting; the die casting machine comprises a first cylindrical end, and the outer diameter of the first cylindrical end is smaller than the inner diameter of the first cylindrical cavity and larger than the inner diameter of the second cylindrical cavity; a second cylindrical end is coaxially and slidably connected in the first cylindrical end, and the outer diameter of the second cylindrical end is smaller than or equal to the inner diameter of the second cylindrical cavity; the die casting machine comprises a driving mechanism for driving the first cylindrical end and the second cylindrical end to move towards the casting mold; during die casting, the first cylindrical end and the second cylindrical end move downwards until the first cylindrical end abuts against the backing ring to realize peripheral sealing, and then the second cylindrical end applies pressure downwards to provide continuous pressure for casting melt in the casting mold cavity until the casting melt is cooled and solidified, so that casting is completed.
Through adopting above-mentioned technical scheme, in the embedding process, adopt above-mentioned embedding base to hold in the palm and an embedding section of thick bamboo, backing ring carries out the embedding for the casting mould that the embedding material solidifies and forms after the calcination is formed with first cylindrical cavity, second cylindrical cavity, funnel chamber, and the backing ring is fixed in between first cylindrical cavity and the second cylindrical cavity. When casting, because the casting material melts the back liquid level height and arranges first cylindricality cavity in, when first cylinder end downstream contradicts to the backing ring on, the gap between first cylinder end and the first cylindricality intracavity wall upwards risees from the liquation of the extruded casting material of first cylinder end for first cylinder end can contradict and realize sealedly on the backing ring, and the backing ring is prefabricated machine-shaping, can be with the comparatively smooth of surface manufacturing, and is sealed effectual. And after the first cylindrical end is abutted and sealed with the backing ring, air cannot be mixed into the part below the lower end of the first cylindrical end, and then continuous pressure can be generated on the casting material under the condition that the second cylindrical end applies downward pressure until the casting material is solidified and molded. Compared with the existing casting method, the scheme can effectively reduce the phenomenon that air holes are generated in the casting cavity due to the fact that air is doped in the die-casting process, and effectively improves the quality of casting forming.
The invention is further configured to: and an expansion area is arranged at the position 3-5mm away from the wax pattern of the paraffin casting channel adopted in the second step.
By adopting the technical scheme, after the paraffin casting channel is completely combusted and volatilized, the liquid storage cavity is formed in the replacement position of the expansion area by the casting cavity, and when a casting material is contracted, the liquid storage cavity can quickly supplement the contraction position, so that a blank body obtained by casting is more uniform.
The invention is further configured to: the outer diameter of the adopted backing ring is larger than that of the first cylindrical part.
Through adopting above-mentioned technical scheme, when carrying out the embedding, embedded material can radially extend the part parcel of first cylindricality portion with the backing ring for the fixed effect of backing ring is better, and the area of contact increase of backing ring and embedded material, and is sealed effectual.
The invention is further configured to: one side of the backing ring facing the hemispherical part is coaxially connected with a convex ring, and the cross section of the convex ring is T-shaped.
Through adopting above-mentioned technical scheme, after accomplishing the embedding, bulge loop and embedding material form axial limit function for the backing ring has better fixed effect and sealed effect.
The invention is further configured to: a sliding cavity is coaxially arranged in the first cylindrical end, the upper part of the sliding cavity is a pressure cavity with a relatively small inner diameter, the lower part of the sliding cavity is a sliding cavity with a relatively large inner diameter, and a step surface is formed between the pressure cavity and the sliding cavity due to the difference of the inner diameters; the second cylindrical end comprises a stress part which is connected with the pressure cavity in a sliding way and a force application part which is connected with the sliding cavity in a sliding way; the pressure cavity is provided with an air inlet and outlet nozzle communicated to the outside, and the air inlet and outlet nozzle is connected with an air charging and sucking device through a hose; the driving mechanism further comprises an air cylinder which is connected with the upper part of the first cylindrical end and used for driving the first cylindrical end to move up and down.
Through adopting above-mentioned technical scheme, when using, drive first cylinder end downstream and support to press and seal in the backing ring through the cylinder, the rethread fills getter device and controls second cylinder end and exert pressure downwards and can carry out die-casting under the continuous pressure state to the casting material.
The invention is further configured to: the die casting machine in the fifth step further comprises a sliding sleeve, the lower end of the sliding sleeve is of an opening structure, and the upper end of the sliding sleeve is in threaded connection with a sealing cover; the end of the first cylinder is connected in the sliding sleeve in a sliding way; an air inlet nozzle is arranged on the side wall, sleeved between the sealing cover and the end head of the first cylinder, of the sliding sleeve, and the air inlet nozzle is connected with an air charging device through a hose; a sliding groove is formed in the axis of the first cylindrical end, and the second cylindrical end is connected to the sliding groove in a sliding mode; a sealing plate is arranged at the upper end of the sliding groove, and a plurality of supporting rods are circumferentially arranged on the sealing plate; the upper end of the supporting rod is fixedly connected with the sealing plate, and the lower end of the supporting rod is connected with the end head of the first cylinder in a penetrating manner and extends out of the lower end surface of the end head of the first cylinder; when the casting mould is placed under the end of the first cylinder, the position of the supporting rod just corresponds to the position of the backing ring;
a plurality of elastic buckles are arranged on the upper end face of the first cylindrical end at intervals around the sealing plate, semicircular bulges are arranged on one sides, facing the side wall of the sealing plate, of the elastic buckles, and arc-shaped grooves for the semicircular bulges to be embedded into are formed in the side wall of the sealing plate;
the die casting machine further comprises an adjusting mechanism for adjusting the height of the sliding sleeve.
Through adopting above-mentioned technical scheme, when die-casting, earlier be close to the casting mould with the sliding sleeve through adjustment mechanism, then aerify in to the sliding sleeve through aerating device, atmospheric pressure promotes first cylinder end, closing plate, second cylinder end and moves down together. The melt level of the casting material is kept at the same time, and when the support rod is contacted with the backing ring, the first cylindrical end is contacted with the melt level of the casting material. After the supporting rod is contacted with the backing ring, the end of the first cylinder continuously slides downwards until the end of the first cylinder is abutted and sealed with the backing ring. At this moment, the sealing plate is separated from the fastening of the elastic buckle and is jacked up, so that air pressure is converted into the sliding groove from the gap between the sealing plate and the first cylindrical end, the sliding groove acts on the second cylindrical end, continuous pressure is generated on the casting material through the second cylindrical end until the casting material is cooled and solidified, and casting is completed.
The invention is further configured to: the inner wall of the sliding sleeve is provided with a first limiting part, and the side wall above the first cylindrical end is provided with a first limiting block which is matched with the first limiting part and used for preventing the first cylindrical end from being separated from the sliding sleeve; the inner wall of spout is equipped with the spacing portion of second, and the top lateral wall of second cylinder end is equipped with and is used for preventing that second cylinder end breaks away from the second stopper of spout with the spacing cooperation of second.
Through adopting above-mentioned technical scheme, the casting is accomplished the back, opens the closing cap pressure release, upwards improves the sliding sleeve position through adjustment mechanism, because first stopper is contradicted in first spacing portion, and the second stopper is contradicted in the spacing portion of second, through the position of upwards adjusting the sliding sleeve, can be convenient peel off first cylinder end and second cylinder end from the casting material.
The invention is further configured to: the die casting machine also comprises a base, wherein the base is connected with sliding rods on two sides of the sliding sleeve, an installation plate slides on the sliding rods, and the sliding sleeve is fixed on the installation plate; the top of the sliding rod is fixedly connected with a cross beam; the adjusting mechanism comprises a screw rod in threaded connection with the cross beam, the lower end of the screw rod is rotatably connected to the mounting plate through a bearing and a bearing seat, and a hand wheel is arranged at the upper end of the screw rod.
Through adopting above-mentioned technical scheme, only need rotate the hand wheel and can drive the mounting panel and slide on the slide bar to the place height of adjusting the sliding sleeve.
The invention is further configured to: the base is provided with a positioning ring for fixing the casting mold.
Through adopting above-mentioned technical scheme, the holding ring can fix a position the casting mould for the casting mould realizes coaxially with first cylinder end.
In conclusion, compared with the existing casting method, the method can effectively reduce the phenomenon that air is mixed in the casting cavity to generate air holes in the casting process, and can provide continuous pressure for the casting process, thereby effectively improving the quality of casting and forming.
Drawings
FIG. 1 is a schematic view of an embodiment of an embedded structure;
FIG. 2 is a schematic view showing the structure of a mold after completion of calcination according to an example;
FIG. 3 is a schematic view of an embodiment of a cast material after melting;
FIG. 4 is a schematic view of a casting machine according to an embodiment;
FIG. 5 is a schematic sectional view of a mold according to an embodiment in casting;
FIG. 6 is a schematic structural view of a die casting machine according to a second embodiment;
FIG. 7 is an enlarged schematic view of portion A of FIG. 6;
FIG. 8 is an enlarged schematic view of portion B of FIG. 7;
fig. 9 is a schematic view of the second embodiment in a die-casting state.
Description of reference numerals: 1. a wax pattern; 2. embedding a base support; 3. an embedding cylinder; 4. a backing ring; 5. a circular base; 6. a convex edge; 7. a first cylindrical portion; 8. a second cylindrical portion; 9. a hemispherical portion; 10. a paraffin casting channel; 11. expanding the area; 12. a convex ring; 13. a first cylindrical cavity; 14. a second cylindrical cavity; 15. a funnel cavity; 16. a first cylindrical end; 17. a second cylindrical end; 18. a cylinder; 19. a pressure chamber; 20. a sliding cavity; 21. a force receiving portion; 22. a force application part; 23. an air inlet and outlet nozzle; 24. an air charging and sucking device; 25. a casting die cavity; 26. casting a material; 27. a sliding sleeve; 28. sealing the cover; 29. an air inlet nozzle; 30. an inflator; 31. a chute; 32. a sealing plate; 33. a support bar; 34. an elastic buckle; 35. a semicircular bulge; 36. an arc-shaped slot; 37. a first limiting part; 38. a first stopper; 39. a second limiting part; 40. a second limiting block; 41. a base; 42. a positioning ring; 43. a slide bar; 44. mounting a plate; 45. a hand wheel; 46. a cross beam; 47. a screw.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example (b): a method for casting a dental restoration based on a peek material, the casting material 26 being BioHPP (high Performance Polymer, manufactured by Bredet, Germany) a semi-crystalline thermoplastic peek-based ceramic reinforced high Performance Polymer, the casting process comprising the steps of:
firstly, manufacturing a prosthesis wax pattern 1;
embedding the wax pattern 1, as shown in fig. 1, including an embedding base 2, an embedding cylinder 3 made of metal material and a backing ring 4, wherein the embedding base 2 includes a circular base 5, a protruding edge 6 extending axially is provided at the edge of the circular base 5, a protrusion extending towards the extending direction of the protruding edge 6 is provided at the axis of the circular base 5, the protrusion includes a first cylindrical portion 7 connected with the circular base 5, a second cylindrical portion 8 coaxially connected with the first cylindrical portion 7, and a hemispherical portion 9 coaxially connected with the second cylindrical portion 8; the diameter of the second cylindrical portion 8 is equal to the diameter of the hemispherical portion 9 and smaller than the diameter of the first cylindrical portion 7.
When embedding, firstly connecting a paraffin casting channel 10 on the wax model 1, and connecting the other end of the paraffin casting channel 10 to the top end of the hemispherical part 9; an expansion area 11 is arranged at a position 13-5mm away from the wax pattern of the paraffin casting channel 10. Then the backing ring 4 is coaxially sleeved on the second cylindrical part 8 and supported and placed on a step surface formed between the first cylindrical part 7 and the second cylindrical part 8; and then clamping one end of the embedding cylinder 3 on the inner wall of the convex edge 6, filling an embedding material in the embedding cylinder 3, wherein the embedding material is a phosphate embedding material, and taking down the embedding base support 2 after the embedding material is solidified. The embedding cylinder 3 and the backing ring 4 are made of metal materials and are not taken down after being embedded. Wherein, the outer diameter of the adopted backing ring 4 is larger than that of the first cylindrical part, one side of the backing ring 4 facing the hemispherical part 9 is coaxially connected with a convex ring 12, and the cross section of the convex ring 12 is T-shaped.
And step three, roasting the embedded casting mold, wherein the roasting process comprises an initial low-temperature roasting stage and a later high-temperature roasting stage, and in the initial low-temperature stage, a casting opening is placed downwards for 30min in order to facilitate outflow of the wax pattern 1 material. At the high temperature stage after 30min, the casting opening of the casting mold is arranged upwards so as to be beneficial to completely volatilizing the wax pattern 1 in the embedding material; in the high temperature stage, the roasting temperature is 880 ℃, and the roasting temperature is kept for 1.5 hours until the wax pattern 1 and the paraffin casting channel 10 are completely combusted and volatilized to form the casting cavity 25. As shown in connection with fig. 2, the opening of the mold cavity 25 includes a first cylindrical cavity 13 instead formed by the first cylindrical portion 7 upon embedding, a second cylindrical cavity 14 instead formed by the second cylindrical portion 8, and a funnel cavity 15 instead formed by the hemispherical portion 9.
Step four, as shown in fig. 3, the roasting temperature is reduced to 400 ℃, and the casting material 26 is put into the opening of the casting mold cavity 25 and kept for 20 min; the melt level of the molten cast material 26 after melting is required to be placed in the first cylindrical cavity 13.
Step five, as shown in fig. 4, transferring the casting mold into a die-casting machine for die-casting; the die casting machine comprises a first cylindrical end 16, and the outer diameter of the first cylindrical end 16 is smaller than the inner diameter of the first cylindrical cavity 13 and larger than the inner diameter of the second cylindrical cavity 14; a second cylindrical end 17 is coaxially and slidably connected in the first cylindrical end 16, and the outer diameter of the second cylindrical end 17 is smaller than or equal to the inner diameter of the second cylindrical cavity 14; the die casting machine comprises a driving mechanism for driving the first cylindrical end 16 and the second cylindrical end 17 to move up and down. The drive mechanism includes a cylinder 18 attached to the frame above the first cylindrical end 16. In addition, a sliding cavity is coaxially arranged in the first cylindrical end 16, the upper part of the sliding cavity is a pressure cavity 19 with a relatively small inner diameter, the lower part of the sliding cavity is a sliding cavity 20 with a relatively large inner diameter, and a step surface is formed between the pressure cavity 19 and the sliding cavity 20 due to the difference of the inner diameters; the second cylindrical end 17 includes a force receiving portion 21 slidably connected to the pressure chamber 19 and a force applying portion 22 slidably connected to the slide chamber 20. The pressure chamber 19 is provided with an air inlet and outlet nozzle 23 connected to the outside, and the air inlet and outlet nozzle 23 is connected to an air charging and sucking device 24 through a hose. The air charging and sucking device 24 can be realized by an air pump, and negative pressure is formed in the pressure cavity 19 by air suction of the air pump, so that the second cylindrical end 17 is sucked and fixed in the sliding cavity and is limited by the force application part 22 and a step surface between the pressure cavity 19 and the sliding cavity 20. When it is necessary to press the second cylindrical end 17 outward, compressed air is injected into the pressure chamber 19 by the air pump, thereby pushing the second cylindrical end 17. The air pump can be an air pump or an inflator pump, and the hose is connected with an electromagnetic reversing valve for switching. It should be noted that the above-described embodiment of the air charging and sucking device 24 is only a preferred embodiment of the present invention, and other embodiments of the present invention can be used instead.
As shown in fig. 5, during die casting, the first cylindrical end 16 and the second cylindrical end 17 move downward until the first cylindrical end 16 abuts against the backing ring 4 to achieve the peripheral seal, and then the second cylindrical end 17 presses downward to provide continuous pressure on the casting melt in the mold cavity 25 until the casting melt is cooled and solidified, thereby completing the casting.
Example two: as shown in fig. 6 and 7, the difference from the first embodiment is that, unlike the die casting machine used in the first embodiment, the die casting machine includes a first cylinder head 16, and the outer diameter of the first cylinder head 16 is smaller than the inner diameter of the first cylindrical cavity 13 and larger than the inner diameter of the second cylindrical cavity 14; a second cylindrical end 17 is coaxially and slidably connected in the first cylindrical end 16, and the outer diameter of the second cylindrical end 17 is smaller than or equal to the inner diameter of the second cylindrical cavity 14; the die casting machine comprises a driving mechanism for driving the first cylindrical end 16 and the second cylindrical end 17 to move towards the casting mould. The driving mechanism comprises a sliding sleeve 27, the lower end of the sliding sleeve 27 is of an opening structure, and the upper end of the sliding sleeve 27 is in threaded connection with a sealing cover 28. The first cylindrical end 16 is slidably connected within a sliding sleeve 27. The sliding sleeve 27 is provided with an air inlet nozzle 29 on the side wall between the cover 28 and the first cylinder end 16, and the air inlet nozzle 29 is connected with an air charging device 30 through a hose. The inflator 30 may be an inflator or a mechanism known in the art for performing inflation. The first cylindrical end 16 is provided with a sliding groove 31 at the axial center, and the second cylindrical end 17 is slidably connected in the sliding groove 31. The upper end of the chute 31 is provided with a sealing plate 32, and the sealing plate 32 is circumferentially provided with a plurality of support rods 33. The upper end of the support rod 33 is fixedly connected with the sealing plate 32, and the lower end of the support rod 33 is connected to the first cylindrical end 16 in a penetrating manner and extends out of the lower end face of the first cylindrical end 16. When the mould is placed directly below the first cylindrical end 16, the support rods 33 are positioned to correspond exactly to the position of the backing ring 4.
As shown in fig. 8, a plurality of elastic buckles 34 are arranged on the upper end surface of the first cylindrical end 16 at intervals around the sealing plate 32, a semicircular protrusion 35 is arranged on one side of each elastic buckle 34 facing the side wall of the sealing plate 32, and an arc-shaped groove 36 for the semicircular protrusion 35 to be embedded into is arranged on the side wall of the sealing plate 32. When the sealing plate 32 is attached to the upper surface of the first cylindrical end 16 to seal the sliding groove 31, the semicircular protrusion 35 is just inserted into the arc-shaped groove 36, and the supporting rod 33 extends downward beyond the lower end surface of the first cylindrical end 16.
As shown in fig. 7, the inner wall of the sliding sleeve 27 is provided with a first limiting portion 37, and the upper side wall of the first cylindrical end 16 is provided with a first limiting block 38 which is matched with the first limiting portion 37 for preventing the first cylindrical end 16 from separating from the sliding sleeve 27. The inner wall of spout 31 is equipped with second spacing portion 39, and the top lateral wall of second cylinder end 17 is equipped with and is used for preventing that second cylinder end 17 breaks away from the second stopper 40 of spout 31 with the cooperation of second spacing portion 39.
As shown in fig. 6, the die casting machine further includes a base 41 and an adjusting mechanism for adjusting the height of the sliding sleeve 27, and a positioning ring 42 for fixing the casting mold is provided on the base 41. The adjusting mechanism comprises sliding rods 43 positioned at two sides of the positioning ring 42, a mounting plate 44 slides on the sliding rods 43, and the sliding sleeve 27 is fixed on the mounting plate 44. The top of the sliding rod 43 is fixedly connected with a cross beam 46, a screw rod 47 is connected to the cross beam 46 through threads, the lower end of the screw rod 47 is rotatably connected to the mounting plate 44 through a bearing and a bearing seat, and a hand wheel 45 is arranged at the upper end of the screw rod 47.
As shown in fig. 9, when die casting is not performed, the second cylindrical end 17 is fixed by a frictional force with the slide groove 31, and the first cylindrical end 16 is fixed by a frictional force with the slide sleeve 27. Preferably, the sliding connection part of the first cylindrical end 16 and the second cylindrical end 17 is provided with a rubber piston sleeve which can be kept fixed without external force. During die casting, the sliding sleeve 27 is firstly close to the casting mold through the adjusting mechanism, then the air charging device 30 charges air into the sliding sleeve 27, and the air pressure pushes the first cylindrical end 16, the sealing plate 32 and the second cylindrical end 17 to move downwards together. The melt level of the casting material 26 is maintained, and when the support rod 33 is in contact with the grommet 4, the first cylinder end 16 is in contact with the melt level of the casting material 26. After the support rod 33 contacts the backing ring 4, the first cylindrical end 16 continues to slide downward until it seals against the backing ring 4. At this time, the sealing plate 32 is lifted out of engagement with the elastic buckle 34, so that the air pressure is turned to enter the slide groove 31 from the gap between the sealing plate 32 and the first cylindrical end 16, thereby acting on the second cylindrical end 17, and continuously pressing the casting material 26 through the second cylindrical end 17 until the casting material 26 is cooled and solidified, thereby completing the casting. After the casting is finished, the sealing cover 28 is opened to release pressure, the position of the sliding sleeve 27 is upwards improved through the adjusting mechanism, the first limiting block 38 abuts against the first limiting part 37, the second limiting block 40 abuts against the second limiting part 39, and the first cylindrical end 16 and the second cylindrical end 17 can be conveniently stripped from the casting material 26 by upwards adjusting the position of the sliding sleeve 27. When the sealing cover is used next time, the sealing cover 28 is opened, the sealing plate 32 is firstly pressed back to the buckling position of the elastic buckle 34, the second cylindrical end 17 is pushed to the lower surface to be flush with the first cylindrical end 16, and then the first cylindrical end 16 is pushed to the lower surface to be flush with the sliding sleeve 27.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A dental prosthesis casting method based on a peek material is characterized in that: comprises the following steps of (a) carrying out,
the method comprises the following steps: manufacturing a prosthesis wax pattern (1);
step two: embedding a wax pattern (1), wherein the embedding comprises an embedding base support (2), an embedding cylinder (3) and a backing ring (4), the embedding base support (2) comprises a circular base (5), a convex edge (6) extending axially is arranged at the edge of the circular base (5), a bulge extending towards the extending direction of the convex edge (6) is arranged at the axis of the circular base (5), and the bulge comprises a first cylindrical part (7) connected with the circular base (5), a second cylindrical part (8) coaxially connected with the first cylindrical part (7) and a hemispherical part (9) coaxially connected with the second cylindrical part (8); the diameter of the second cylindrical portion (8) is equal to the diameter of the hemispherical portion (9) and smaller than the diameter of the first cylindrical portion (7); when embedding, connecting a paraffin casting channel (10) on the wax pattern (1), and connecting the other end of the paraffin casting channel (10) to the top end of the hemispherical part (9); then the backing ring (4) is coaxially sleeved on the second cylindrical part (8) and supported and placed on a step surface formed between the first cylindrical part (7) and the second cylindrical part (8); then clamping one end of the embedding cylinder (3) on the inner wall of the convex edge (6), filling an embedding material in the embedding cylinder (3), and taking down the embedding base support (2) after the embedding material is solidified;
step three: roasting the embedded casting mold at 880 ℃ for 1.5h until the wax pattern (1) and the paraffin casting channel (10) are completely combusted and volatilized to form a casting mold cavity (25); the opening of the casting die cavity (25) comprises a first cylindrical cavity (13) formed by replacing the first cylindrical part (7) in embedding, a second cylindrical cavity (14) formed by replacing the second cylindrical part (8) and a funnel cavity (15) formed by replacing the hemispherical part (9);
step four: reducing the roasting temperature to 400 ℃, and putting a casting material (26) from an opening of a casting mold cavity (25), wherein the casting material (26) is a peek material; keeping for 20 min; the molten liquid level of the molten casting material (26) is required to be placed in the first cylindrical cavity (13);
step five: transferring the casting mold to a die casting machine for die casting; the die casting machine comprises a first cylindrical end head (16), wherein the outer diameter of the first cylindrical end head (16) is smaller than the inner diameter of the first cylindrical cavity (13) and larger than the inner diameter of the second cylindrical cavity (14); a second cylindrical end (17) is coaxially and slidably connected in the first cylindrical end (16), and the outer diameter of the second cylindrical end (17) is smaller than or equal to the inner diameter of the second cylindrical cavity (14); the die casting machine comprises a driving mechanism for driving a first cylindrical end (16) and a second cylindrical end (17) to move towards a casting mold; during die casting, the first cylindrical end (16) and the second cylindrical end (17) move downwards until the first cylindrical end (16) is abutted against the backing ring (4) to realize peripheral sealing, and then the second cylindrical end (17) is pressed downwards to provide continuous pressure for the casting melt in the casting die cavity (25) until the casting melt is cooled and solidified, so that casting is completed.
2. A method for casting a dental restoration based on a peek material according to claim 1, wherein: and an expansion area (11) is arranged at the position 3-5mm away from the wax pattern (1) of the paraffin casting channel (10) adopted in the second step.
3. A method for casting a dental restoration based on a peek material according to claim 1, wherein: the outer diameter of the adopted backing ring (4) is larger than that of the first cylindrical part.
4. A method for casting a dental restoration based on a peek material according to claim 3, wherein: one side of the backing ring (4) facing the hemispherical part (9) is coaxially connected with a convex ring (12), and the cross section of the convex ring (12) is T-shaped.
5. A method for casting a dental restoration based on a peek material according to claim 1, wherein: a sliding cavity is coaxially arranged in the first cylindrical end (16), the upper part of the sliding cavity is a pressure cavity (19) with a relatively small inner diameter, the lower part of the sliding cavity is a sliding cavity (20) with a relatively large inner diameter, and a step surface is formed between the pressure cavity (19) and the sliding cavity (20) due to the difference of the inner diameters; the second cylindrical end (17) comprises a force-bearing part (21) which is connected with the pressure cavity (19) in a sliding way and a force-applying part (22) which is connected with the sliding cavity (20) in a sliding way; the pressure cavity (19) is provided with an air inlet and outlet nozzle (23) communicated to the outside, and the air inlet and outlet nozzle (23) is connected with an air charging and sucking device (24) through a hose; the driving mechanism also comprises a cylinder (18) which is connected with the upper part of the first cylinder end (16) and is used for driving the first cylinder end (16) to move up and down.
6. A method for casting a dental restoration based on a peek material according to claim 1, wherein: the die casting machine in the fifth step further comprises a sliding sleeve (27), the lower end of the sliding sleeve (27) is of an opening structure, and the upper end of the sliding sleeve (27) is in threaded connection with a sealing cover (28); the first cylindrical end (16) is connected in a sliding sleeve (27) in a sliding way; the side wall of the sliding sleeve (27) between the sealing cover (28) and the first cylindrical end (16) is provided with an air inlet nozzle (29), and the air inlet nozzle (29) is connected with an air charging device (30) through a hose; a sliding groove (31) is formed in the axis of the first cylindrical end (16), and the second cylindrical end (17) is connected to the sliding groove (31) in a sliding mode; a sealing plate (32) is arranged at the upper end of the sliding chute (31), and a plurality of supporting rods (33) are arranged on the sealing plate (32) in the circumferential direction; the upper end of the supporting rod (33) is fixedly connected with the sealing plate (32), and the lower end of the supporting rod (33) is connected with the first cylindrical end (16) in a penetrating manner and extends out of the lower end face of the first cylindrical end (16); when the casting mould is placed under the first cylindrical end (16), the position of the supporting rod (33) just corresponds to the position of the backing ring (4);
a plurality of elastic buckles (34) are arranged on the upper end face of the first cylindrical end (16) at intervals around the sealing plate (32), a semicircular bulge (35) is arranged on one side of each elastic buckle (34) facing the side wall of the sealing plate (32), and an arc-shaped groove (36) for embedding the semicircular bulge (35) is formed in the side wall of the sealing plate (32);
the die casting machine further comprises an adjusting mechanism for adjusting the height of the sliding sleeve (27).
7. A method for casting a dental restoration based on a peek material according to claim 6, wherein: a first limiting part (37) is arranged on the inner wall of the sliding sleeve (27), and a first limiting block (38) which is matched with the first limiting part (37) and used for preventing the first cylindrical end head (16) from being separated from the sliding sleeve (27) is arranged on the side wall above the first cylindrical end head (16); the inner wall of spout (31) is equipped with spacing portion of second (39), and the top lateral wall of second cylinder end (17) is equipped with and is used for preventing that second cylinder end (17) break away from second stopper (40) of spout (31) with spacing portion of second (39) cooperation.
8. A method for casting a dental restoration based on a peek material according to claim 6 or 7, characterized in that: the die casting machine further comprises a base (41), sliding rods (43) are connected to the two sides of the sliding sleeve (27) of the base (41), a mounting plate (44) slides on the sliding rods (43), and the sliding sleeve (27) is fixed on the mounting plate (44); the top of the sliding rod (43) is fixedly connected with a cross beam (46); the adjusting mechanism comprises a screw rod (47) in threaded connection with the cross beam (46), the lower end of the screw rod (47) is rotationally connected with the mounting plate (44) through a bearing and a bearing seat, and a hand wheel (45) is arranged at the upper end of the screw rod (47).
9. A method for casting a dental restoration based on a peek material according to claim 8, wherein: the base (41) is provided with a positioning ring (42) for fixing the casting mould.
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| CN201910512017.8A CN110115637B (en) | 2019-06-13 | 2019-06-13 | Dental prosthesis casting method based on peek material |
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| CN106999260A (en) * | 2014-12-09 | 2017-08-01 | 3M创新有限公司 | Dental restortion molding technique |
| JP2020092796A (en) * | 2018-12-12 | 2020-06-18 | 有限会社デンタルオフィスささき | Dental prosthesis, manufacturing method, prosthesis manufacturing support device, and program |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20100297587A1 (en) * | 2001-04-17 | 2010-11-25 | Uri-Dent Ltd. | Dental crowns |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH04126143A (en) * | 1990-09-17 | 1992-04-27 | Nippon Electric Glass Co Ltd | Manufacture of artificial crown |
| EP0601980A1 (en) * | 1992-12-10 | 1994-06-15 | Santo Palazzolo | Process for the rapid production of a denture duplicate for temporary use and product obtained thereby |
| JP2007190087A (en) * | 2006-01-17 | 2007-08-02 | Tokuyama Corp | Method for producing tooth-crown prosthesis |
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| JP2020092796A (en) * | 2018-12-12 | 2020-06-18 | 有限会社デンタルオフィスささき | Dental prosthesis, manufacturing method, prosthesis manufacturing support device, and program |
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| CN110115637A (en) | 2019-08-13 |
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Address after: 350026 3rd floor, HENGFA building, no.861, Panyu Road, Gaishan Town, Cangshan District, Fuzhou City, Fujian Province Patentee after: Fuzhou Zhongsheng Chenggong Medical Technology Co.,Ltd. Address before: 350026 3rd floor, HENGFA building, no.861, Panyu Road, Gaishan Town, Cangshan District, Fuzhou City, Fujian Province Patentee before: Fuzhou Rongcheng Successful Denture Manufacturing Co.,Ltd. |
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Denomination of invention: A casting method for dental restorations based on peek materials Granted publication date: 20201106 Pledgee: Fujian Strait Bank Co.,Ltd. Fuzhou Guangda Branch Pledgor: Fuzhou Zhongsheng Chenggong Medical Technology Co.,Ltd. Registration number: Y2024980013948 |