CN85202741U - Self-tapping and breaking clamping screw for tooth - Google Patents
Self-tapping and breaking clamping screw for tooth Download PDFInfo
- Publication number
- CN85202741U CN85202741U CN 85202741 CN85202741U CN85202741U CN 85202741 U CN85202741 U CN 85202741U CN 85202741 CN85202741 CN 85202741 CN 85202741 U CN85202741 U CN 85202741U CN 85202741 U CN85202741 U CN 85202741U
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- CN
- China
- Prior art keywords
- tooth
- tapping
- nail
- screw thread
- retention pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
The utility model discloses a novel self-tapping and breaking clamping screw for tooth made of the extra low carbon medical-application stainless steel (ooCr18Ni13M. 3). The carbon content in the nail aggregate is smaller than or equal to 0.03 %, and the year corrosion rate is smaller than or equal to 0.05 micron. The utility model adopts the binodal drive screw body, the thread (6) is as a single direction angle hackle, and the effective tension after tapping reaches 14 kg. The utility model has the advantages of reasonable structure, convenient operation, low cost, easy popularization, good curative effect and convenient material fetching.
Description
The present invention is the improvement to a kind of odontopathy filling, fixing device.
Tooth is with the self tapping screw thread retention pin of autotomying, and is widely used in the reparation of multiple dental defect such as undesirable root, residual crown, serious corner cut be damaged.This drive screw requires enough intensity, toughness and suitable elastic modelling quantity on material, and has good anti-corrosion and biocompatibility.Require then structurally to have that steering capability is good, the tapping resistance is little, it is big oppositely to withdraw from pulling force, the characteristics that maintenance firmly reaches self tapping, autotomys.
The at present clinical tooth that generally uses is autotomyed with self tapping, and the screw thread retention pin is many to be made by the low-carbon (LC) medical stainless steel, as the En58J steel alloy of being mentioned among the UK Patent Application GB-2052666.This grade of steel is equivalent to homemade 18-8 type medical stainless steel (1Cr18Ni9,1Cr18Ni9Ti), have favorable mechanical domestic animal energy and certain biocompatibility, its shortcoming is that the inner phosphorus content of the steel of this model (≤0.12%) are comparatively speaking than higher, still there is the intercrystalline corrosion tendency in medium-term and long-term the placement in the oral cavity, stimulate dental tissue, bring misery to the patient; This steel hardness is also bigger, should not directly be installed in the common dental drill machine (rotating speed is in 5000～18000 rev/mins of scopes), and must with the supporting use of reductor.According to another first the international dental instrument exhibition product introduction of special economic zone, Shenzhen City, Guangdong Province, the U.S. international border company (Whaledent International Company) of pausing the Wal utilizes silver as the aggregate of tooth with the screw thread retention pin, outside plating is with gold, the decay resistance of product is improved, but this product involves great expense, and is unfavorable for producing in batches and promoting the use of widely.Structurally, tooth is autotomyed with self tapping, and the screw thread retention pin is general to adopt two-way corner saw tooth thread, and it is fast to have a tapping, and production technology is characteristic of simple comparatively, but oppositely can not bear bigger external force, looseningly easily causes the maintenance failure.
Task of the present invention is improved on material and structure prior art, further improves the decay resistance of drive screw and the retention effect after the tapping.
Invention is achieved in that the low-carbon (LC) medical stainless steel that adopts in homemade Ultra-low carbon medical stainless steel (oocr13Ni13Mo3) the replacement prior art, as the aggregate of drive screw.This kind steel except that phosphorus content far below the steel that use in the prior art, other chemical analysis is basic identical.Phosphorus content reduces chromium minimizing then corresponding and carbon formation carbide in the steel, thereby has increased the quantity that works the chromium that improves the corrosion resistant effect in the solid solution, therefore significantly improved the rotproofness of steel, and the mechanical domestic animal of steel can be unaffected except that hardness reduces.In addition, structurally change two-way corner saw tooth thread in the prior art into unidirectional corner saw tooth thread, that has strengthened tapping rear thread nail body oppositely withdraws from pulling force, and more help its self tapping, the usefulness of autotomying.
Inventing the contained basic chemical analysis of described Ultra-low carbon medical stainless steel (ooCr18Ni13Mo3) comprises: chromium (Cr): 17.00～20.00%, nickel (Ni): 1200.～14.00%, molybdenum (MO): 2.50～3.50%, manganese (Mn)≤2.00%, carbon (C)≤0.03%, silicon (Si)≤0.75% sulfur (S)≤0.01%, phosphorus (P)≤0.025%, all the other are that ferrum (Fe) and other often have element.
The concrete structure of invention is illustrated by accompanying drawing and following example.
Accompanying drawing 1 for this tooth with the autotomy outline drawing of screw thread retention pin of self tapping.
Accompanying drawing 2 is the enlarged drawing of tapping preceding thread spike-tooth shape.
Accompanying drawing 3 is the enlarged drawing of tapping rear thread spike-tooth shape.
This tooth comprises a nail handle (1) and is connected in series two joint drive screw bodies into one mutually with nail handle (1) one end that every joint nail body length is 4.0～5.0mm with the self tapping screw thread retention pin of autotomying, the double-screw bolt external diameter is 0.5～0.7mm.The other end of nail handle (1) can be contained in the common dental drill machine.Be provided with the wide fixed length canned paragraph (2) of 0.3mm that is at the middle part of every joint nail body, in order to prevent tapping.Disconnected (2) one sides of fixed length are for attacking stricture of vagina section (3), and length is 2.0～2.5mm, and opposite side is maintenance section (4).The profile of tooth of thread (6) is unidirectional corner saw profile of tooth on the nail body, and angle is 50 °～65 °, and the profile of tooth height is 0.05～0.07mm, and tooth pitch is 0.25～0.35mm.Breakpoint till (5) among the figure.
During clinical use, screw is positioned on the tooth body in the pre-prepd guide hole, under the propelling of dental drill machine, tapping rapidly.When attacking to fixed length section (2), following to pressure of tooth body double thread nail increases suddenly, impels prosthomere nail body to fracture automatically.Deutomerite nail body is according in like manner carrying out the tapping second time.After the tapping,, the pulling force that oppositely withdraws from of nail body is strengthened because the back groove face and the double-screw bolt of spiral shell tooth (6) meet at right angles, when tapping, owing to attack resistance, it is hook-shaped that the crown generation deformation of spiral shell tooth is sawtooth in addition, be embedded in the dentin, further strengthened the retention effect of drive screw.
Compared with the prior art the present invention is implanted into experiment according to animal body and shows that the rate of corrosion of Ultra-low carbon medical stainless steel is lower than 0.05 micron/year, is better than in the prior art 0.25 micron/year of corrosion of steel rate, the medium-term and long-term placement the dental tissue nonirritant in the oral cavity; Because phosphorus content reduces, the lower hardness of steel, the bending of screw thread retention pin and fracture more conveniently can directly be assemblied in drive screw on the common dental drill during use, does not need to join in addition reductor; Through the entity test, the screw thread retention pin is attacked seven buttons in dentine after, effective pull reaches 14 kilograms, and average every button is 2 kilograms, meets clinical requirement; The manufacturing cost of this nail greatly reduces than the U.S. Wal international corporation's like product that pauses, and is easy to apply.
Claims (2)
1, a kind of tooth is with the self tapping screw thread retention pin of autotomying, comprise a nail handle (1) and be connected in series two joint screw pitch nail bodies mutually into one with the nail pommel, it is characterized in that this screw thread retention pin made by Ultra-low carbon medical stainless steel (OOCr18Ni13M03), its chemical analysis comprises chromium (Cr): 1700～20.00%, nickel (Ni): 12.00～14.00%, molybdenum (MO): 2.50～3.50%, manganese (Mn)≤2.00%, carbon (C)≤0.03%, silicon (Si)≤0.75%, sulfur (S)≤0.01%, phosphorus (P)≤0.025%, all the other are that ferrum (Fe) and other often have element.
2, tooth as claimed in claim 1 is characterized in that with the self tapping screw thread retention pin of autotomying the spiral shell tooth (6) of described drive screw body is unidirectional corner saw profile of tooth, and angle is 50 °～65 °, and the profile of tooth height is 0.05～0.07mm, and tooth pitch is 0.25～0.35mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85202741 CN85202741U (en) | 1985-07-01 | 1985-07-01 | Self-tapping and breaking clamping screw for tooth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85202741 CN85202741U (en) | 1985-07-01 | 1985-07-01 | Self-tapping and breaking clamping screw for tooth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN85202741U true CN85202741U (en) | 1986-12-24 |
Family
ID=4798487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85202741 Ceased CN85202741U (en) | 1985-07-01 | 1985-07-01 | Self-tapping and breaking clamping screw for tooth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85202741U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107028667A (en) * | 2017-05-23 | 2017-08-11 | 杭州西湖生物材料有限公司 | Tooth is autotomyed bone thread retention pin with self tapping |
| US10357341B2 (en) | 2016-11-17 | 2019-07-23 | King Saud University | Bony bracket screw |
-
1985
- 1985-07-01 CN CN 85202741 patent/CN85202741U/en not_active Ceased
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10357341B2 (en) | 2016-11-17 | 2019-07-23 | King Saud University | Bony bracket screw |
| CN107028667A (en) * | 2017-05-23 | 2017-08-11 | 杭州西湖生物材料有限公司 | Tooth is autotomyed bone thread retention pin with self tapping |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CE01 | Termination of patent right |