EP1796573A1 - Orthodontic curved brace consisting of a sputtered shape-memory alloy - Google Patents
Orthodontic curved brace consisting of a sputtered shape-memory alloyInfo
- Publication number
- EP1796573A1 EP1796573A1 EP05797241A EP05797241A EP1796573A1 EP 1796573 A1 EP1796573 A1 EP 1796573A1 EP 05797241 A EP05797241 A EP 05797241A EP 05797241 A EP05797241 A EP 05797241A EP 1796573 A1 EP1796573 A1 EP 1796573A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- wall
- soul
- memory alloy
- bending
- 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.)
- Withdrawn
Links
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
- A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
- A61C7/20—Arch wires
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/0005—Separation of the coating from the substrate
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/14—Metallic material, boron or silicon
- C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
- C23C14/165—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon by cathodic sputtering
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/56—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks
- C23C14/562—Apparatus specially adapted for continuous coating; Arrangements for maintaining the vacuum, e.g. vacuum locks for coating elongated substrates
Definitions
- the present invention relates to an orthodontic arch for use in orthodontics for the correction of malocclusions comprising a wire or a wire piece of shape memory alloy.
- the invention also relates to a method for producing a piece of wire for such an orthodontic arch.
- shape memory (FG) materials "remember” and resume their original shape when deformed at low temperature (martensite) and later heated to an austenitic high temperature phase, and often exhibit superelastic behavior
- This property results from the plateau occurring within a certain temperature range above a characteristic pre-stress of about a few hundred MPa in the stress-strain (hysteresis) curve, in which strain the austenite transforms into martensite, stress-induced martensite may correspond
- the applied voltage is twinned and thus reacts within the plateau on a deformation of the material with a constant counterforce.
- Components made of shape memory alloys are particularly attractive because they have superelastic properties within certain limits. Especially in orthodontics this property is desirable where constant forces are beneficial for correcting misaligned teeth. So far, full wires of shape memory alloy are well known for this use. These wires of biocompatible alloys, in particular of NiTi, are preferably used for the above-mentioned orthodontic purposes.
- the object of the invention is now to provide an orthodontic arc comprising a wire for having such properties, wherein the wire can be easily and inexpensively manufactured at least in pieces of a limited length and wherein the wire or piece of wire for the said application in orthodontics having desired superelasticity.
- An essential basic idea of the invention is to make use of the achievement of the spring effect of the orthodontic arc of a hollow wire or piece of wire whose wall is relatively thin and consists of a shape memory alloy.
- the orthodontic arc may be formed entirely by the hollow wire or may include a portion bent from such hollow wire.
- the feature "hollow wire” does not preclude filling its interior with a material that differs from the material of the wall, so that the hollow wire becomes a kind of "composite wire".
- the thin wall of the hollow wire in such a way that the superelastic property is achieved in the case of bending.
- the desired constant superelastic force plateau can be approached much better in bending or in the orthodontic treatment than is the case with a solid wire. This applies all the more, the thinner the wall of the hollow wire.
- the outer dimensions of the wire pieces that can be used for the purposes mentioned are approximately between 0.1 mm and 2 mm, whereby the range between 0.2 mm and 1 mm is to be preferred.
- the wall thickness of the relatively thin-walled wall according to the invention is approximately between 1 .mu.m and 100 .mu.m, in particular between 5 .mu.m and 50 .mu.m. It is particularly advantageous to manufacture the wall of NiTi or NiTiX, wherein X is in particular Cu, Pd, Hf, Zr, Nb or Fe.
- the hollow wire with a filling (core) of a material, wherein the flexural elastic modulus of the core is generally smaller, in particular is at least 10 times smaller than the flexural modulus of elasticity of the superelastic material of the wall.
- the soul is surrounded by the wall positively and / or non-positively.
- This will be one for the mentioned areas of application suitable composite material in the manner of a composite wire of thickness between about 0.01 mm and 5 mm created.
- the core within the wall has a relatively low modulus of elasticity when bent between about 1 MPa and 80 GPa. It does not depend on the geometry of the cross-section of the wall. This can be round, oval or angular.
- Such composite wires may have, for example, a NiTi wall and a soft polymer core.
- the advantages of the invention result from the fact that the wire according to the invention reaches the plateau within which the desired superelastic properties occur, in particular during a bend in a customary degree in orthodontics.
- Optimized conditions can be used to achieve a superelastic hysteresis at a body temperature of 37 ° C.
- the orthodontic arc having such a hollow wire in particular in the case of the composite wires, is characterized by a high kink resistance and can thus be bent into almost any shape.
- orthodontic arches can be formed with the desired force and bending moment consistency.
- the invention thus contributes to increasing the success of particular orthodontic treatments, but the fields of application of the wire or the wire pieces are almost unlimited. These are precisely because of the good compatibility of the preferred material NiTi especially in medicine, where they can be used as "mitdevelopmentde" stabilizers or fasteners.
- Another important idea of the invention is to produce the shape memory alloy wall in a sputtering process.
- Two approaches are conceivable for producing the composite wires according to the invention using the sputtering technique:
- One approach is the planar sacrificial layer method, as described in DE 199 48 199 A1.
- the deposition of sputtered NiTi layers on the polymer films disclosed therein, however, has the disadvantage that this method does not provide all-round coating.
- a core of sacrificial material for example a capillary or a tube made of copper or brass, with shape memory alloy with superelastic properties, in particular with NiTi, coated all around.
- the core or the core of the unwanted foreign material is dissolved in an acid bath following the sputtering and subsequently the possibly required annealing treatment and replaced by a soft polymer core.
- This can be poured or pulled, for example, in the bore of the wire.
- the wall of the wire piece surrounds the soul directly and in particular non-positively.
- materials for the soul nylon, Perlon, silicone, polyimide, epoxy resin or dental glue are recommended. It is also possible to manufacture the core from monofilament and / or multifilament polymer threads, which in turn can also be cast in, so that the core itself forms a composite material.
- the wires according to the invention are in particular in the following dimensions:
- the wall thicknesses of the shape memory alloy are in the range between 1 .mu.m and 100 .mu.m, the range between 5 .mu.m and 50 .mu.m being preferred.
- the outer dimension is in the range between 0.1 mm and 2 mm, with the range between 0.2 mm and 1 mm being preferred.
- the flexural modulus of elasticity of the filler is in the range between 100 kPa and 80 GPa, with the range between 100 MPa and 2 GPa being particularly preferred.
- the lengths of the wires to be produced are in the order of several centimeters, with the customary in orthodontics dimensions of about 10 cm to 20 cm can be easily manufactured with the proposed method. Also wire lengths of the order of a meter are conceivable.
- the length of the unfilled hollow wires, in particular, are not fundamentally limited during production.
- FIG. 1 four stages of the production of a composite wire suitable for an orthodontic arch
- Figure 2 is a diagram of a bending test
- FIG. 1 shows, in four stages, the production of a polymer-filled hollow wire whose wall consists of shape memory alloy with superelastic behavior.
- the deposition of the alloy takes place by means of the known physical deposition methods, preferably with the known methods of sputtering or cathode sputtering.
- crystalline layers is deposited either on a heated substrate at least 450 0 C or it is carried out after the sputtering solution annealing at about 500-700 0 C.
- a tube with a circular, rectangular or oval cross-section is produced by sputtering technique as follows: First, a piece of wire or a capillary 1 (FIG. 1a) made of sacrificial material, for example a commercially available copper capillary, is provided as substrate (blank). This is round-coated in a following step (FIG. 1 b). For this purpose, for example, the sputtering substrate 1 is set in rotation (arrow A) and a directed coating by sputtering (arrows 2) performed. On the substrate 1, the FG alloy 3, here made of NiTi, adhere.
- the circularly coated sacrificial substrate is removed by using a selective solvent 4, which is located in a vessel 5.
- a selective solvent 4 which is located in a vessel 5.
- 30% nitric acid is used. It can be seen how the copper 6 dissolves.
- the crystallization of the sputtered shape memory layer occurs before or after the selective wet chemical etching.
- soft core material introduced into the hollow wire.
- a two-component adhesive such as an epoxy resin or other single-component air-curing adhesive, may be filled into the hollow wire 3 ( Figure 1d).
- wires according to the invention were created by a continuous deposition process of NiTi on a rotating copper capillary. After crystallization and dissolution of the copper core using nitric acid, a self-supporting NiTi capillary was created which was filled with polyamide wire. The modulus of elasticity of the soft core material was considered negligible compared to the Young's modulus of NiTi.
- the super-elastic force plateau of a wire according to the invention is determined at about 37 ° C by means of a 3-point bending test ( Figure 2) with a central load and a support distance of 10mm.
- the piece of wire to be tested is bent centrally up to 3.1 mm and the required bending force during loading and unloading is measured.
- the force plateau is considered to be sufficiently therapeutically desirable and constant, in particular, if, on unloading, the change in bending force in the region between the deflection at 2.0 mm and the deflection at 1.0 mm does not exceed 20% of the bending force at 2.0 mm and the bending force at 2.0 mm does not exceed 5N.
- the bending elastic modulus E is calculated according to the following equation, where F is the bending force [N], L is the bearing distance [mm], I is the area moment of inertia [mm 2 ] and ⁇ is the deflection [mm].
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Veterinary Medicine (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Epidemiology (AREA)
- Dentistry (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004048379A DE102004048379A1 (en) | 2004-10-01 | 2004-10-01 | Spring element made of sputtered shape memory alloy |
PCT/EP2005/010378 WO2006037505A1 (en) | 2004-10-01 | 2005-09-26 | Orthodontic curved brace consisting of a sputtered shape-memory alloy |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1796573A1 true EP1796573A1 (en) | 2007-06-20 |
Family
ID=35478876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05797241A Withdrawn EP1796573A1 (en) | 2004-10-01 | 2005-09-26 | Orthodontic curved brace consisting of a sputtered shape-memory alloy |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1796573A1 (en) |
DE (1) | DE102004048379A1 (en) |
WO (1) | WO2006037505A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103305801B (en) * | 2013-06-05 | 2015-04-08 | 哈尔滨工程大学 | TiNi-based SMA (shape memory alloy) multilayer thin film and preparation method thereof |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5018969A (en) * | 1989-09-25 | 1991-05-28 | Ormco Corporation | Braided elastic wire, with memory, for braces |
CA2024046A1 (en) | 1989-09-28 | 1991-03-29 | Alberto Ferro | Stabilized leukocyte-interferons |
US5344315A (en) * | 1993-12-02 | 1994-09-06 | Hamilton Ortho Inc. | Multi-strand orthodontic arch wires and methods for use thereof |
US5399088A (en) * | 1994-01-03 | 1995-03-21 | Mechley; Michael E. | Orthodontic wire and method for the moving of teeth |
US5683245A (en) * | 1995-05-30 | 1997-11-04 | Ormco Corporation | Shape memory orthodontic archwire having variable recovery stresses |
US5683254A (en) | 1996-01-02 | 1997-11-04 | Lin; Chiu-Chen | Swivel plug structure with a bulb socket |
DE29924586U1 (en) * | 1998-09-09 | 2003-12-24 | Minnesota Mining And Manufacturing Company, Saint Paul | Orthodontic archwire for dental surgery has rectangular cross-section with rounded corners, flat lingual side and recesses on 3 other sides with tooth colored coating in recesses |
DE19948199B4 (en) * | 1999-10-07 | 2007-06-21 | Stiftung Caesar Center Of Advanced European Studies And Research | Production of laminated composites with superelastic effect |
WO2001068013A1 (en) * | 2000-03-14 | 2001-09-20 | Unitika Glass Fiber Co., Ltd. | Wire for use in orthodontics and method for manufacture thereof |
US20040063059A1 (en) * | 2002-09-30 | 2004-04-01 | Meckel Nathan K. | Dental braces and methods for coating |
-
2004
- 2004-10-01 DE DE102004048379A patent/DE102004048379A1/en not_active Withdrawn
-
2005
- 2005-09-26 WO PCT/EP2005/010378 patent/WO2006037505A1/en active Application Filing
- 2005-09-26 EP EP05797241A patent/EP1796573A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2006037505A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102004048379A1 (en) | 2006-04-13 |
WO2006037505A1 (en) | 2006-04-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE IT LI |
|
17P | Request for examination filed |
Effective date: 20070313 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: QUANDT, ECKHARD Inventor name: DRESCHER, DIETER Inventor name: STERZL, TOBIAS Inventor name: ZAMPONI, CHRISTIANE Inventor name: RUMPF, HOLGER Inventor name: SERNETZ, FRIEDRICH Inventor name: WINZEK, BERNHARD |
|
DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
Designated state(s): CH DE IT LI |
|
17Q | First examination report despatched |
Effective date: 20100326 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: ACANDIS GMBH & CO. KG |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20130403 |