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EP1386985B1 - Verfahren zum elektrolytischen Polieren von zahnärztlichen Instrumenten aus Nickel-Titan Legierungen - Google Patents

Verfahren zum elektrolytischen Polieren von zahnärztlichen Instrumenten aus Nickel-Titan Legierungen Download PDF

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Publication number
EP1386985B1
EP1386985B1 EP02015895A EP02015895A EP1386985B1 EP 1386985 B1 EP1386985 B1 EP 1386985B1 EP 02015895 A EP02015895 A EP 02015895A EP 02015895 A EP02015895 A EP 02015895A EP 1386985 B1 EP1386985 B1 EP 1386985B1
Authority
EP
European Patent Office
Prior art keywords
nickel
sulfuric acid
parts
current
electrolytic polishing
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.)
Expired - Lifetime
Application number
EP02015895A
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English (en)
French (fr)
Other versions
EP1386985A1 (de
Inventor
Bertrand Kempf
François Aeby
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dentsply Maillefer Instruments Holding SARL
Original Assignee
Maillefer Instruments Holding SARL
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=30011077&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1386985(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Maillefer Instruments Holding SARL filed Critical Maillefer Instruments Holding SARL
Priority to AT02015895T priority Critical patent/ATE405695T1/de
Priority to EP02015895A priority patent/EP1386985B1/de
Priority to DE60228434T priority patent/DE60228434D1/de
Priority to PCT/IB2003/003135 priority patent/WO2004007812A1/fr
Priority to JP2004521012A priority patent/JP2006514712A/ja
Priority to US10/521,726 priority patent/US20050173258A1/en
Priority to AU2003247031A priority patent/AU2003247031A1/en
Publication of EP1386985A1 publication Critical patent/EP1386985A1/de
Publication of EP1386985B1 publication Critical patent/EP1386985B1/de
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C25F3/22—Polishing of heavy metals

Definitions

  • the present invention relates to an electrolytic polishing method for dental instruments of nickel-titanium alloy using an electrolyte comprising sulfuric acid and methanol.
  • Dental instruments used in root processing are generally made of stainless steel, but also of nickel-titanium alloy. These alloys offer interesting performance in terms of flexibility and respect of the canal path. However, the instruments produced with these latter alloys have rather rough surface conditions following machining by grinding. These surface states meet certain conditions sufficient for the creation of microscopic cracks which can, under the action of a cyclic movement repeated during a work in a curved channel, cause a propagation of cracks until the rupture of the instrument. This risk presents a major disadvantage of these dental instruments for the work of the dentist as well as for the manufacturer of the instruments. Surface treatment by smoothing out these irregularities can extend the life of the dental instrument by reducing the speed of crack propagation.
  • the instruments for the treatment of dental root canals often have a complex geometry, comprising for example a tapered shaft having on at least part of its length, constituting its active part, a helical cutting edge.
  • a complex geometry comprising for example a tapered shaft having on at least part of its length, constituting its active part, a helical cutting edge.
  • Electrochemical polishing is a suitable solution and has been known for a long time as an effective means for producing such a surface treatment, among others, for steels, titanium and their alloys.
  • the approach to determine, with respect to the desired results, for example the composition of the bath, the power supply system or other important components so optimal is, however, relatively empirical.
  • the search for the optimum parameters for a new material to be treated or a new process for this purpose is thus often the subject of a series of experiments, because these parameters are not well determinable during calculations on the basis of known methods.
  • a composition of the bath differing in the exact proportions, but similar to that proposed in this document, is well suited for the treatment of nickel-titanium alloys in that this alloy has on the surface a layer of TiO 2 , similar to titanium pure.
  • a method has a major disadvantage, in the sense that the parts to be treated by electrolysis must be prepared by an emery or by sanding their surface. This preparation step involves additional costs that make the process unattractive from an economic point of view; next to the high cost, the manufacturing time is increased and this additional step involves the risk of damaging parts or mixing.
  • the object of the present invention is to provide an electrolysis process for dental instruments made of titanium-nickel alloy tending to obviate the aforementioned drawbacks of current processes and allowing the realization of such a process at an interesting cost, without the step of preparing the parts to be treated, thus increasing the speed of the process while reducing its inherent risks.
  • the process according to the present invention is characterized for this purpose by the fact that the power supply is carried out by applying a current, the density of this current being regulated so that it remains constant.
  • the preparation step required under the usual process is no longer necessary for the new process and the additional costs are removed, allowing a much more cost price than before.
  • the manufacturing time is also shortened and the risk of damaging the parts or mixing them is decreased.
  • the application of a constant density current allows a significant decrease in the stirring speed of the parts in the bath of the electrolyte. Instead of a stirring speed of 200 mm / s as before, this is for the new process about 1 mm / s to 10 mm / s, facilitating the handling of parts to be treated and sparing wear of the automaton used to perform the electrolysis.
  • An electrolytic polishing method for dental instruments of nickel-titanium alloys uses as the electrolyte a mixture of sulfuric acid and methanol.
  • the electrolyte is a mixture of methanol (CH 4 O) and sulfuric acid (H 2 SO 4 ) comprising between 0.1 mole and 10 mole of sulfuric acid.
  • Methanol is pure CH 4 O, sulfuric acid used at a 96% degree of purity.
  • the electrolyte is made by adding sulfuric acid in methanol, the concentration of sulfuric acid being in the margins indicated above. A good chemical homogeneity of the electrolytic solution can be obtained by a rest of the mixture of about three days.
  • the power supply is achieved by applying a current to the electrodes.
  • the density of the current is regulated so that it remains constant.
  • the cathode is formed by at least one electrode, for example platinum, and the anode is formed by the parts to be treated, the electrolysis then working on the cathode principle.
  • a current regulation system makes it possible to control it and keep the current density constant. This is, among other things, possible by placing a reference electrode in the electrolyte, this reference electrode being connected to an ammeter for continuously measuring the current through the electrolyte. The current regulation system can then use these data to maintain the current density at a predetermined value, for example using a computer cooperating with said ammeter and ensuring the application of a current adapted by the component supplying the power supply.
  • This value is preferably between 10 A / dm 2 and 30 A / dm 2 . Since the current density is kept constant and the electrical resistance of the electrolyte varies during the electrolysis because neither the composition of the bath nor that of the parts to be treated is stationary, the potential between the electrodes is variable. For safety reasons, the voltage can however be controlled so as not to exceed a voltage limit of 60 V, higher values being considered dangerous for the personnel. The fact that it is the current density and not the potential that is kept constant thus constitutes a significant difference from the electrolytic polishing method according to the present invention compared to conventional methods.
  • the entire electrolytic polishing process is performed under circumstances that keep the bath temperature below 20 ° C.
  • the temperature can be maintained at the desired temperature, preferably 5 ° C.
  • the workpieces are ready for electrolytic polishing.
  • the parts that is to say the dental instruments of nickel-titanium alloys or parts thereof, do not undergo any specific treatment during a preparation step or a pretreatment before the electrolytic polishing, apart from a possible normal degreasing in a dead bath.
  • the parts to be treated are then immersed in the electrolyte. The duration of this immersion is between 10 s and 120 s.
  • the parts are agitated at the chosen stirring speed, the movement being preferably parallel between the cathodes.
  • the stirring speed of the pieces can be low, from about 1 mm / s to 10 mm / s, due to the use of a constant current density.
  • this electrolytic polishing step in the electrolytic bath it follows a rinsing and drying parts, these steps corresponding to a usual process.
  • the dental instrument workpieces in question are made of a titanium alloy having at least 40% by weight of titanium, thus allowing the application of a method according to the present invention.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Dental Preparations (AREA)

Claims (6)

  1. Verfahren zum elektrolytischen Polieren für zahnärztliche Instrumente aus Nickel-Titan-Legierung unter Benutzung eines Schwefelsäure und Methanol enthaltenden Elektrolyten, dadurch gekennzeichnet, dass die elektrische Versorgung dadurch realisiert wird, dass ein Strom angelegt wird, wobei die Dichte dieses Stromes so geregelt wird, dass sie konstant bleibt.
  2. Verfahren nach dem vorangehenden Anspruch, dadurch gekennzeichnet, dass die Stromdichte konstant auf einem Wert zwischen 10 A/dm2 und 30 A/dm2 gehalten wird.
  3. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Elektrolyt ein Gemisch aus Methanol und Schwefelsäure ist, das zwischen 0,1 und 10 Mol Schwefelsäure enthält.
  4. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Kathode aus zumindest einer Platinelektrode gebildet wird, während die Anode aus den zu behandelnden Stücken gebildet wird.
  5. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Bewegungsgeschwindigkeit der Stücke niedrig ist und etwa 1 mm/s bis 10 mm/s beträgt.
  6. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die zu behandelnden Stücke aus einer Titanlegierung hergestellt werden, die mindestens 40 Massenprozent an Titan aufweist.
EP02015895A 2002-07-17 2002-07-17 Verfahren zum elektrolytischen Polieren von zahnärztlichen Instrumenten aus Nickel-Titan Legierungen Expired - Lifetime EP1386985B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
AT02015895T ATE405695T1 (de) 2002-07-17 2002-07-17 Verfahren zum elektrolytischen polieren von zahnärztlichen instrumenten aus nickel-titan legierungen
EP02015895A EP1386985B1 (de) 2002-07-17 2002-07-17 Verfahren zum elektrolytischen Polieren von zahnärztlichen Instrumenten aus Nickel-Titan Legierungen
DE60228434T DE60228434D1 (de) 2002-07-17 2002-07-17 Verfahren zum elektrolytischen Polieren von zahnärztlichen Instrumenten aus Nickel-Titan Legierungen
JP2004521012A JP2006514712A (ja) 2002-07-17 2003-07-08 ニッケル−チタン合金製歯科器具の電解研磨方法
PCT/IB2003/003135 WO2004007812A1 (fr) 2002-07-17 2003-07-08 Procédé de polissage électrolytique pour des instruments dentaires en alliage de nickel-titane
US10/521,726 US20050173258A1 (en) 2002-07-17 2003-07-08 Method for electrolytic polishing of dental instruments made of nickel-titanium alloy
AU2003247031A AU2003247031A1 (en) 2002-07-17 2003-07-08 Method for electrolytic polishing of dental instruments made of nickel-titanium alloy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02015895A EP1386985B1 (de) 2002-07-17 2002-07-17 Verfahren zum elektrolytischen Polieren von zahnärztlichen Instrumenten aus Nickel-Titan Legierungen

Publications (2)

Publication Number Publication Date
EP1386985A1 EP1386985A1 (de) 2004-02-04
EP1386985B1 true EP1386985B1 (de) 2008-08-20

Family

ID=30011077

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02015895A Expired - Lifetime EP1386985B1 (de) 2002-07-17 2002-07-17 Verfahren zum elektrolytischen Polieren von zahnärztlichen Instrumenten aus Nickel-Titan Legierungen

Country Status (7)

Country Link
US (1) US20050173258A1 (de)
EP (1) EP1386985B1 (de)
JP (1) JP2006514712A (de)
AT (1) ATE405695T1 (de)
AU (1) AU2003247031A1 (de)
DE (1) DE60228434D1 (de)
WO (1) WO2004007812A1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7588720B2 (en) * 1999-04-30 2009-09-15 Tso3, Inc. Method and apparatus for ozone sterilization
DE102007011632B3 (de) * 2007-03-09 2008-06-26 Poligrat Gmbh Elektropolierverfahren für Titan
MD3808G2 (ro) * 2007-05-25 2009-08-31 Институт Прикладной Физики Академии Наук Молдовы Instalaţie de prelucrare electrică a metalelor
CH704235B1 (fr) * 2010-12-16 2015-09-30 Fkg Dentaire Sa Instrument endodontique pour l’alésage de canaux radiculaires d’une dent.
CN104363856B (zh) 2012-05-10 2016-11-16 瑞尼斯豪公司 制造物品的方法
CN104470463B (zh) 2012-05-10 2019-02-05 瑞尼斯豪公司 用于制造制品的方法
GB201210120D0 (en) * 2012-05-10 2012-07-25 Renishaw Plc Laser sintered part and method of manufacture
KR101544357B1 (ko) 2014-04-23 2015-08-13 주식회사 비앤메디 표면처리된 티타늄 임플란트의 전해연마를 이용한 표면개질 방법
KR102844166B1 (ko) 2019-03-08 2025-08-07 스트라우만 홀딩 에이쥐 치과용 드릴 표면 처리

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6569193B1 (en) * 1999-07-22 2003-05-27 Advanced Cardiovascular Systems, Inc. Tapered self-expanding stent
US6375826B1 (en) * 2000-02-14 2002-04-23 Advanced Cardiovascular Systems, Inc. Electro-polishing fixture and electrolyte solution for polishing stents and method
DE10037337A1 (de) * 2000-03-14 2001-09-20 Nmi Univ Tuebingen Verfahren und Vorrichtung zum Elektropolieren von Körpern aus Nickel-Titan-Legierungen

Also Published As

Publication number Publication date
US20050173258A1 (en) 2005-08-11
JP2006514712A (ja) 2006-05-11
WO2004007812A1 (fr) 2004-01-22
AU2003247031A1 (en) 2004-02-02
EP1386985A1 (de) 2004-02-04
ATE405695T1 (de) 2008-09-15
DE60228434D1 (de) 2008-10-02

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