CN110478066B - Abutment correction accessory for mandibular teeth with low elongation before oral implant restoration - Google Patents
Abutment correction accessory for mandibular teeth with low elongation before oral implant restoration Download PDFInfo
- Publication number
- CN110478066B CN110478066B CN201910796437.3A CN201910796437A CN110478066B CN 110478066 B CN110478066 B CN 110478066B CN 201910796437 A CN201910796437 A CN 201910796437A CN 110478066 B CN110478066 B CN 110478066B
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- Prior art keywords
- sleeve
- teeth
- abutment
- crown
- solid
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- 239000007943 implant Substances 0.000 title claims description 34
- 239000007787 solid Substances 0.000 claims abstract description 58
- 230000035876 healing Effects 0.000 claims abstract description 32
- 238000002513 implantation Methods 0.000 claims abstract description 19
- 230000000881 depressing effect Effects 0.000 claims abstract description 14
- 206010044048 Tooth missing Diseases 0.000 claims abstract description 5
- 238000005192 partition Methods 0.000 claims description 17
- 230000000994 depressogenic effect Effects 0.000 claims description 14
- 238000004080 punching Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 239000004053 dental implant Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 229910001256 stainless steel alloy Inorganic materials 0.000 claims description 2
- 210000000515 tooth Anatomy 0.000 abstract description 75
- 210000004871 mandibular tooth Anatomy 0.000 abstract description 7
- 230000007012 clinical effect Effects 0.000 abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008439 repair process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0018—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the shape
- A61C8/0037—Details of the shape
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0048—Connecting the upper structure to the implant, e.g. bridging bars
- A61C8/005—Connecting devices for joining an upper structure with an implant member, e.g. spacers
Abstract
The invention provides a abutment correction accessory for a mandibular tooth, which is used for reducing elongation before oral implantation and restoration, and comprises a sleeve crown, a solid cushion and a central through baffle, wherein the sleeve crown adopts a cylindrical sleeve crown, the central through baffle is arranged in the sleeve crown, the central through baffle is perpendicular to the axis of the sleeve crown, the central through baffle divides the sleeve crown into an upper sleeve part and a lower sleeve part, the solid cushion is nested in the upper sleeve part, the top surface of the solid cushion forms an occlusal surface, and the lower sleeve part is covered on a healing abutment. The abutment correction accessory for the mandibular teeth, which is used for depressing and stretching before oral implantation and restoration, can be in occlusion contact with the mandibular teeth, thereby achieving the clinical effect of depressing the mandibular teeth. For some cases of insufficient space of the prosthesis caused by long tooth missing time and extension of the jaw teeth, the correction accessory can be used for providing a certain occlusion space for later planting and repairing, and finally, a good occlusion relationship is obtained.
Description
Technical Field
The invention relates to a base correction accessory for a mandibular tooth with low elongation before oral implantation and restoration.
Background
In recent years, more and more patients select implant restoration because of missing teeth, but because of long missing teeth time, different degrees of extension can appear on the teeth of the jaw, and in addition, because the period of implant restoration is longer, extension can appear on the teeth of the jaw, thereby the vertical space of the later restoration body becomes smaller, and the implant restoration difficulty is increased.
For the extension of the teeth of the jaw, several methods are commonly used in clinic to provide prosthesis space for implant restoration: 1. crown cutting repair extension tooth: the method comprises the steps of firstly treating an extension tooth root canal, then cutting the crown to repair the crown so as to reduce the clinical crown height and create an occlusion space, and the method is carried out at the cost of damaging the jaw teeth. 2. Traditional orthodontic methods depress already elongated teeth: a segmental arch is often chosen to depress the extension teeth, but studies have shown that conventional fixed appliances often cause unnecessary extension of the adjacent teeth and longer treatment times while depressing the molars. 3. Microplant depressing extension tooth: in clinic, the micro-implant is usually selected to be used for depressing the extension teeth, three micro-implant nails are usually implanted on the cheek-palate side of the extension teeth to ensure uniform depression, and an elastic rubber chain is utilized for carrying out continuous gingival traction, and the average pressure can be lowered by 2-4mm until a proper jaw curve is restored, so that enough jaw-gum distance required by implant restoration can be provided, but the method has the defects of invasiveness, high cost and the like, so that the application of the method in clinic is limited to a certain extent.
The above-mentioned problems are those which should be considered and addressed in the cavity implant repair process.
Disclosure of Invention
The invention aims to provide a abutment correction accessory for a mandibular tooth, which is used for depressing and extending the mandibular tooth before oral implantation restoration, and solves the problems that the mandibular tooth is damaged or unnecessary adjacent tooth extension and longer treatment time are caused or the traumatism and the cost are high when the mandibular tooth extension is depressed in the prior art.
The technical scheme of the invention is as follows:
a abutment correction accessory for tooth of jaw is pressed down before oral implantation restoration, including sleeve crown, solid cushion and central punching baffle, sleeve crown adopts the tube-shape sleeve crown, and central punching baffle locates in the sleeve crown, and central punching baffle sets up with the axis of sleeve crown perpendicularly, and central punching baffle separates the sleeve crown into sleeve upper portion and sleeve lower part, and solid cushion nestification is in sleeve upper portion, and the top surface of solid cushion forms the interlock face, and sleeve lower part dustcoat is on healing abutment.
Optionally, a central hole is formed in the middle of the central through partition board, a groove is formed in the middle of the healing base, and the central hole is communicated with the groove in the middle of the healing base.
Optionally, the solid cushion is provided with a supporting part, the supporting part adopts a solid horn-shaped supporting part, the top surface of the supporting part forms an occlusal surface, and the solid cushion adopts a columnar solid cushion.
Optionally, the sleeve crown is provided with a sleeving part, the sleeving part is arranged at the top of the upper part of the sleeve, the sleeving part adopts a hollow horn-shaped sleeving part, and the supporting part is nested in the sleeving part.
Alternatively, the occlusal surface may be a concave surface or a horizontal plane.
Optionally, the height of the solid cushion is equal to or greater than the height of the upper part of the sleeve, and the height of the solid cushion is 2-5mm.
Alternatively, the solid cushion is made of polytetrafluoroethylene or rubber material.
Alternatively, the sleeve and the central through partition are integrally cast from stainless steel or an aluminum alloy.
Optionally, the lower portion of the sleeve is bonded to the healing abutment by an adhesive.
Optionally, the implementation process of the abutment correction accessory for the jaw teeth, which is used for depressing and stretching before oral implantation and restoration, includes the following steps: the implant is implanted in the tooth-missing area, a healing abutment is placed after 3-4 months, a sleeve crown matched with the diameter and the height of the healing abutment is placed on the upper portion of the healing abutment, the lower portion of the sleeve is combined with the healing abutment through a temporary adhesive, then a solid cushion is selected according to the occlusion relation and the diameter of the sleeve crown, the solid cushion is embedded on the upper portion of the sleeve crown through friction, the occlusion surface of the solid cushion is contacted with the extension teeth of the opposite jaw during occlusion, and the elastic force of the solid cushion is utilized to intermittently generate pressing force on the teeth of the opposite jaw, so that the purpose of making the teeth of the opposite jaw be depressed is achieved.
The beneficial effects of the invention are as follows:
1. the abutment correction accessory for the jaw teeth, which is used for reducing elongation before oral implantation and restoration, is an implant-based correction device, and can achieve clinical effects of occlusion contact with the jaw teeth or reducing the jaw teeth, so that enough occlusion space is provided for later implantation and restoration, and better functions and stable occlusion relation are finally obtained.
2. This kind of a correction accessory for abutment that is used for tooth of jaw of extension is pressed before oral implant restoration uses implanted implant as the anchorage to implant upper portion healing abutment is the saddle, has designed a correction accessory, can press down the tooth of jaw effectively, creates suitable perpendicular space for the prosthetic, can solve when oral implant restoration, leads to prosthetic perpendicular space not enough because of tooth extension, influences the problem of restoration effect.
3. Compared with other treatment methods or treatment instruments for the extension of the jaw teeth, the invention firstly avoids the damage to the jaw teeth, secondly uses the implant as an anchorage, does not need to additionally assist the anchorage nail to press down the jaw teeth, reduces the additional damage to patients and reduces the cost of the anchorage nail. The abutment correction accessory for the mandibular teeth, which is used for the low elongation before oral implantation and restoration, can be produced in batches according to different specifications and sizes, and has wide clinical application prospect.
Drawings
FIG. 1 is a schematic view of a abutment correction fitting for a pre-dental implant restoration depressed elongated pair of teeth of the present invention;
FIG. 2 is a schematic view of the structure of the sleeve crown and solid cushion in an embodiment;
FIG. 3 is a schematic view of the structure of a solid cushion in an embodiment;
FIG. 4 is a schematic view of another embodiment of the abutment correction fitting for pre-dental restoration depressed elongated pair of teeth of the present invention;
FIG. 5 is a schematic view of the structure of the sleeve crown and the solid cushion, the rest and the socket part in the embodiment;
FIG. 6 is a schematic view of the healing abutment and implant structure in an embodiment;
wherein: 1-implant, 2-healing abutment, 3-sleeve crown, 4-solid cushion, 5-central punching partition board, 6-supporting part, 7-occlusal surface, 8-groove and 9-central hole;
31-upper sleeve part, 32-lower sleeve part, 33-socket part.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Examples
A abutment correction accessory for a mandibular tooth with low elongation before oral implant restoration is disclosed as shown in fig. 1 and 2, and comprises a sleeve crown 3, a solid cushion 4 and a central through partition board 5, wherein the sleeve crown 3 is a cylindrical sleeve crown 3, the central through partition board 5 is arranged in the sleeve crown 3, the central through partition board 5 is perpendicular to the axis of the sleeve crown 3, the central through partition board 5 divides the sleeve crown 3 into a sleeve upper part 31 and a sleeve lower part 33, the solid cushion 4 is nested in the sleeve upper part 31, the top surface of the solid cushion 4 forms an occlusal surface 7, and the sleeve lower part 33 is covered on a healing abutment 2.
The abutment correction accessory for the jaw teeth with low elongation before oral implantation and restoration is a correction device based on an implant 1, and can achieve clinical effects of occlusion contact or low jaw teeth, so that enough occlusion space is provided for later implantation and restoration, and better functions and stable occlusion relation are finally obtained.
The abutment correction accessory for the mandibular teeth, which is used for depressing and stretching before oral implantation and restoration, can be in occlusion contact with the mandibular teeth, thereby achieving the clinical effect of depressing the mandibular teeth. For some cases of insufficient space of the prosthesis caused by long tooth missing time and extension of the jaw teeth, the correction accessory can be used for providing a certain occlusion space for later planting and repairing, and finally, a good occlusion relationship is obtained.
The realization process for the abutment correction accessory for the jaw teeth, which is used for depressing and stretching before oral implantation and restoration, comprises the following steps: the implant 1 is placed on a healing abutment 2 after 3-4 months in a tooth missing area, a sleeve crown 3 matched with the diameter and the height of the healing abutment 2 is placed on the upper portion of the healing abutment 2, the lower sleeve portion 33 is combined with the healing abutment 2 through a temporary adhesive, then a solid soft cushion 4 is selected according to the occlusion relation and the diameter of the sleeve crown 3, the solid soft cushion 4 is embedded on the upper sleeve portion 31 of the sleeve crown 3 through friction, the occlusion surface 7 of the solid soft cushion 4 is contacted with the extension teeth of the opposite jaw during occlusion, the elastic force of the solid soft cushion 4 is utilized to intermittently generate pressing force on the opposite jaw teeth, and the purpose of making the opposite jaw teeth depressed is achieved.
The abutment correction accessory for the mandibular teeth, which is used for depressing and stretching before oral implantation and restoration, is provided with the solid cushion 4, the upper part 31 of the embedded sleeve is embedded, the upper surface of the solid cushion 4 is in biting contact with the mandibular teeth, the solid cushion 4 is preferably made of polytetrafluoroethylene or rubber materials, and the abutment correction accessory has certain elasticity and can play a role in depressing the mandibular teeth. The size and diameter of the solid cushion 4 are matched with those of the upper sleeve part 31 of the stainless steel sleeve crown 3, and the solid cushion 4 has a depression effect on the jaw teeth through combination of mechanical friction force, so that enough occlusion space is provided for later planting and repairing, and a more stable occlusion relation is established.
This kind of a abutment correction annex to jaw tooth that is used for low extension before oral implant restoration uses implant 1 as the anchorage, with implant 1 upper portion healing abutment 2 is the saddle, can be effectively low to the jaw tooth, for the prosthetic creation suitable perpendicular space, can solve when oral implant restores, runs into to the jaw tooth extension and leads to prosthetic perpendicular space not enough, influences the problem of restoration effect.
The abutment correction accessory for the mandibular teeth, which is used for being pushed down and stretched before oral implant restoration, takes the implant 1 as an anchorage, is fixed on the healing abutment 2, so that the solid cushion 4 or the support part 6 applies pushing down force to the mandibular teeth under the action of occlusion break force, thereby creating proper inter-mandibular distance for implant secondary restoration, and being applicable to the situation of extension of the mandibular teeth caused by long-term tooth deficiency in a restoration area.
Such abutment correction attachment for pre-dental implant restoration low-elongation pair jaw teeth of the embodiment has advantages in that: 1. the pair of jaw teeth is not damaged; 2. no additional orthodontic treatment is required; 3. no additional planting nails are needed to be implanted, the damage to the patient is reduced, and the additional correction cost is greatly reduced.
In the abutment correction accessory for the mandibular teeth, which is used for depressing and extending before oral implantation and restoration, the height of the solid cushion 4 is larger than or equal to the height of the upper part 31 of the sleeve, and the occlusal surface 7 of the solid cushion 4 can be ensured to depress the mandibular teeth. The preferred height of the solid cushion 4 is 2-5mm. The solid cushion 4 with different heights can be selected according to the degree of the clinical requirement of pressing down the pair of the teeth of the jaw.
In the abutment correction accessory for the mandibular teeth, which is used for the mandibular teeth and is low in elongation before oral implant restoration, a cylindrical sleeve crown 3 made of stainless steel or aluminum alloy is preferably adopted, the common cross section of the sleeve crown 3 and a central through partition 5 is H-shaped, the sleeve crown 3 is integrally divided into an upper part and a lower part, namely a sleeve upper part 31 and a sleeve lower part 33, the size and the shape of the sleeve lower part 33 are matched with those of a healing abutment 2 of an implant 1, the healing abutment 2 is combined by means of mechanical friction force and adhesion force, the middle of the sleeve upper part 31 and the sleeve lower part 33 is separated by the central through partition 5, and a central hole 9 of the central through partition 5 is communicated with a groove 8 of the healing abutment 2. The grooves 8 are preferably in-line grooves, cross grooves, triangular grooves, hexagonal grooves, etc. Clinically, the abutment correction accessory is often required to be adhered to the healing abutment 2, after the pressing action is finished, the real soft cushion can be taken out by arranging the central hole 9 of the central punching partition 5, the abutment is healed by using a tool through the center Kong Ningsong of the punching partition, and the healing abutment 2 and the correction accessory are directly taken down for subsequent operation, so that the operation is simple and convenient, and time and labor are saved.
One specific example of an embodiment is as follows: taking a Tixos inner hexagonal implant as an example, the healing abutment 2 can be divided into different specifications according to the diameter and the height, the gum penetrating diameter can be divided into 4.5mm, 5mm and 6mm, and the height can be divided into 3, 4, 5, 6 and 7mm, so that the size, the diameter and the height of the stainless steel round sleeve crown 3 are matched with the size, the diameter and the height of the stainless steel round sleeve crown, the size, the diameter and the height of the stainless steel round sleeve crown are respectively divided into different specifications, the height of the solid cushion 4 is formulated into different specifications according to the size of an occlusion gap, preferably 2-5mm, and the occlusion surface 7 of the solid cushion 4 is in occlusion contact with the opposite teeth.
In one embodiment, the solid cushion 4 is provided with a supporting portion 6, the supporting portion 6 adopts a solid horn-shaped supporting portion 6, the top surface of the supporting portion 6 forms an occlusal surface 7, the solid cushion 4 adopts a columnar solid cushion 4, occlusion contact of the teeth is achieved by arranging the supporting portion 6, and the teeth are depressed by the elasticity of the supporting portion 6, and the solid horn-shaped supporting portion 6 is adopted, so that the volume of the occlusal surface 7 of the teeth can be increased, and more sufficient depression pressure can be provided.
In another embodiment, the sleeve crown 3 is provided with a sleeve joint part 33, the sleeve joint part 33 is arranged on the top of the sleeve upper part 31, the sleeve joint part 33 adopts a hollow horn-shaped sleeve joint part 33, and the supporting part 6 is nested in the sleeve joint part 33. Through setting up the portion of cup jointing 33, realize supporting and the location to the portion of supporting 6 for the depression pressure of portion of supporting 6 is more stable, and the effect is better.
In the abutment correction accessory for the mandibular teeth, which is used for being depressed and stretched before oral implantation and restoration, the occlusal surface 7 adopts a concave surface or a horizontal plane, and the corresponding occlusal surface 7 is selected by different teeth, so that more proper occlusion is realized.
Compared with other treatment modes for elongating the jaw teeth, the abutment correction accessory for the jaw teeth with low elongation before oral implantation and restoration firstly avoids damage to the jaw teeth, and secondly utilizes the implant 1 as an anchorage without additional auxiliary anchorage nail to lower the jaw teeth, thereby reducing the additional damage to patients and reducing the cost of anchorage nails. The abutment correction accessory for the mandibular teeth, which is used for being depressed and stretched before oral implantation and restoration, can be produced in batches according to different specifications and sizes, and has wide clinical application prospect.
Claims (7)
1. A abutment straightening attachment for a pre-dental implant restoration depressed elongated pair of teeth, characterized by: the sleeve crown is a cylindrical sleeve crown, the central punching partition plate is arranged in the sleeve crown, the central punching partition plate is perpendicular to the axis of the sleeve crown, the central punching partition plate divides the sleeve crown into an upper sleeve part and a lower sleeve part, the solid cushion is nested in the upper sleeve part, the top surface of the solid cushion forms an occlusal surface, and the lower sleeve part is covered on a healing base; the solid soft cushion is provided with a supporting part, the supporting part adopts a solid horn-shaped supporting part, the top surface of the supporting part forms an occlusal surface, and the solid soft cushion adopts a columnar solid soft cushion; the sleeve crown is provided with a sleeving part, the sleeving part is arranged at the top of the upper part of the sleeve, the sleeving part adopts a hollow horn-shaped sleeving part, and the supporting part is nested in the sleeving part; the occlusal surface adopts a concave surface or a horizontal plane.
2. The abutment correction fitting for pre-dental implant restoration depression of elongated pair of jaw teeth of claim 1, wherein: the middle part of the central punching partition plate is provided with a central hole, the middle part of the healing base station is provided with a groove, and the central hole is communicated with the groove in the middle part of the healing base station.
3. The abutment correction fitting for pre-dental implant restoration depression of elongated pair of jaw teeth of claim 1, wherein: the height of the solid cushion is equal to or greater than that of the upper part of the sleeve, and the height of the solid cushion is 2-5mm.
4. A abutment correction fitting for pre-dental restoration depressed elongated pair of teeth as set forth in any one of claims 1-3 wherein: the solid cushion is made of polytetrafluoroethylene or rubber material.
5. A abutment correction fitting for pre-dental restoration depressed elongated pair of teeth as set forth in any one of claims 1-3 wherein: the sleeve and the central through partition plate are integrally cast by stainless steel or aluminum alloy.
6. A abutment correction fitting for pre-dental restoration depressed elongated pair of teeth as set forth in any one of claims 1-3 wherein: the lower part of the sleeve is adhered to the healing abutment by an adhesive.
7. A abutment correction fitting for pre-dental restoration depressed elongated pair of teeth as set forth in any one of claims 1-3 wherein: the realization process for the abutment correction accessory for the jaw teeth, which is used for depressing and stretching before oral implantation and restoration, comprises the following steps: the implant is implanted in the tooth-missing area, a healing abutment is placed after 3-4 months, a sleeve crown matched with the diameter and the height of the healing abutment is placed on the upper portion of the healing abutment, the lower portion of the sleeve is combined with the healing abutment through a temporary adhesive, then a solid cushion is selected according to the occlusion relation and the diameter of the sleeve crown, the solid cushion is embedded on the upper portion of the sleeve crown through friction, the occlusion surface of the solid cushion is contacted with the extension teeth of the opposite jaw during occlusion, and the elastic force of the solid cushion is utilized to intermittently generate pressing force on the teeth of the opposite jaw, so that the purpose of making the teeth of the opposite jaw be depressed is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910796437.3A CN110478066B (en) | 2019-08-27 | 2019-08-27 | Abutment correction accessory for mandibular teeth with low elongation before oral implant restoration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910796437.3A CN110478066B (en) | 2019-08-27 | 2019-08-27 | Abutment correction accessory for mandibular teeth with low elongation before oral implant restoration |
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| Publication Number | Publication Date |
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| CN110478066A CN110478066A (en) | 2019-11-22 |
| CN110478066B true CN110478066B (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910796437.3A Active CN110478066B (en) | 2019-08-27 | 2019-08-27 | Abutment correction accessory for mandibular teeth with low elongation before oral implant restoration |
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| CN (1) | CN110478066B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112842574B (en) * | 2021-01-14 | 2023-05-09 | 黄贵洲 | Extension tooth depressor |
| CN114041893A (en) * | 2021-11-02 | 2022-02-15 | 广州医科大学附属口腔医院（广州医科大学羊城医院） | Occlusion locator supported by implant |
| CN115105233B (en) * | 2022-07-06 | 2023-12-01 | 广东中科安齿生物科技有限公司 | Base station screw channel filling column and preparation method thereof |
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| CN112842574A (en) * | 2021-01-14 | 2021-05-28 | 黄贵洲 | Extension tooth depressor |
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| CN110478066A (en) | 2019-11-22 |
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