EP0994678A1 - Procede et dispositif pour detacher un element prothetique fixe a un moignon de dent - Google Patents

Procede et dispositif pour detacher un element prothetique fixe a un moignon de dent

Info

Publication number
EP0994678A1
EP0994678A1 EP99920834A EP99920834A EP0994678A1 EP 0994678 A1 EP0994678 A1 EP 0994678A1 EP 99920834 A EP99920834 A EP 99920834A EP 99920834 A EP99920834 A EP 99920834A EP 0994678 A1 EP0994678 A1 EP 0994678A1
Authority
EP
European Patent Office
Prior art keywords
prosthetic part
holding member
collet
drive motor
housing
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Withdrawn
Application number
EP99920834A
Other languages
German (de)
English (en)
Inventor
Detlef Kersting
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.)
Irmer Joachim Dr
Original Assignee
Irmer Joachim Dr
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
Application filed by Irmer Joachim Dr filed Critical Irmer Joachim Dr
Publication of EP0994678A1 publication Critical patent/EP0994678A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C3/00—Dental tools or instruments
    • A61C3/16—Dentists' forceps or clamps for removing crowns
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C3/00—Dental tools or instruments
    • A61C3/16—Dentists' forceps or clamps for removing crowns
    • A61C3/166—Dentists' forceps or clamps for removing crowns acting by vibration

Definitions

  • the invention relates to a method for detaching a prosthetic part firmly connected to a tooth stump and a device for carrying out this method, in particular for detaching tooth crowns or bridges, starting from a Cartesian coordinate system with a vertical, longitudinal and transverse axis , the origin of which lies in the center of the tooth stump, the device is arranged approximately parallel to the vertical axis.
  • a dental instrument for loosening individual crowns has become known from DE 26 30 272 A1.
  • This device which is also referred to in specialist circles as a so-called shepherd's staff, consists of a hook that can be placed in the prosthetic part and weights of different weights that are arranged in the housing of the instrument.
  • the weights are movably mounted between two springs and are transferred in the direction of the hook to release the crown, so that the spring can be pretensioned between the hook and the weight in different latching positions.
  • the hook is now placed on the lower edge of the crown and the instrument is aligned approximately parallel to the vertical axis of the crown. Then the latching of the weight is released, so that it is moved away from the crown due to the spring preload and hurled against the second spring arranged at the other end of the shepherd's staff, which thus slows down the impact of the weight and its energy. Due to the resulting impulse, a linear force acts on the crown, which causes the cement layer between the crown and the tooth stump by means of the axial
  • the object of the invention is therefore to provide a method and an apparatus for carrying out this method, with which the fixed connection between the prosthetic part and the tooth stump is destroyed in a simple manner, without extensive dental knowledge being necessary.
  • the prosthetic part should not be damaged, so that it can be fixed on the tooth stump after treatment. Furthermore, both individual crowns and dental bridges can be detached from the tooth stump by means of the device.
  • the procedure for solving this task comprises the following steps:
  • the device for carrying out this method and for achieving the object according to the invention has a retaining member encompassing the prosthetic part and a drive motor arranged in a housing, which are connected to one another by means of one or more connecting members, the adjustment movements of the drive motor being convertible into oscillating vibrations by means of the connecting members are, which can be transferred to the prosthetic part via the holding member as oscillating torsional moments about the vertical axis of the tooth stump.
  • the holding member In order to establish a positive and non-positive connection necessary for the transmission of the torsional moment between the holding member and the prosthetic part, the holding member is designed as a collet and completely engages around the prosthetic part in the circumferential direction thereof, the positive fit preferably in the area of the occlusal surface of the prosthetic part and the plane formed by the longitudinal and transverse axes is accomplished.
  • the largely painless solution of the fixed connection between the prosthetic part and the tooth stump is advantageously achieved in that the adjustment curve of the torsional moment is + / - 1.0 °, since due to the relatively small adjustment curve the torsional moments are not or only insignificantly transferred to the tooth stump, so that the human nerves in the tooth stump are not, or only slightly, acted upon by force.
  • the vibrations are generated by a motor, preferably as
  • FIG. 1 shows a tooth stump with an attached prosthetic part
  • FIG. 2 shows a device in longitudinal section fixed on the prosthetic part according to a first exemplary embodiment
  • FIG. 3 shows an enlarged illustration of the device according to FIG. 2,
  • FIG. 4 shows a second embodiment of the device
  • FIG. 5 shows a section along the line V-V in FIG. 4,
  • FIG. 6 shows the device according to FIG. 2 rotated through 90 °
  • FIG. 7 shows a device according to FIG. 2 with a DC motor drive
  • Figure 8 is a collet for molars and premolars
  • Figure 9 is a collet for anterior teeth.
  • FIG. 1 shows a tooth stump 1 which is held in the human gums 2 and onto which a prosthetic part 3 in the form of a tooth crown is placed by means of a cement layer 4.
  • a cardesian coordinate system is provided in such a way that its origin lies in the geometric center of the prosthetic part 3 and the axes which run perpendicular to one another originate from this 5 have common intersection.
  • the vertical axis is designated 6, the longitudinal axis 7 and the transverse axis of the Cartesian coordinate system 8.
  • FIG. 2 shows a device 11 with a housing 12 consisting of two housing shells 12 'and 12 ", which is connected to the prosthetic part 3 in a positive and non-positive manner by means of a holding member 13 placed on the prosthetic part 3.
  • the vertical axis 6 of the prosthetic part 3 is aligned with the longitudinal axis 13 'in the mounted state of the holding member 13.
  • the holding member 13 is designed as a collet 14 and detachably held in a holding member receptacle 15 in the housing 12.
  • the receiving means 15 is locked in a nut 16 and rotatably arranged in a four-point bearing 17 Detachable locking of the collet 14 is screwed by means of a gill nut 18 on the side opposite the prosthetic part 3.
  • the collet 14 consists of two parts, namely with a first part that is non-positively connected to the receiving means 15 and a second part, the form - and grips the prosthetic part 3 in a force-fitting manner d Loosening the collet 14 on the prosthetic part 3 takes place in that the first part of the collet 14 arranged in the receiving means 15 is conical and at least one slot is machined in its central plane, so that when the collet 14 is locked with the receiving means 15, the prosthetic part 3 encompassing part of the collet 14 is clamped radially to the circumference of the prosthetic part 3.
  • the nut 16 is in a force-locking operative connection with a leaf spring 19 which is rotatably mounted in the housing 12 of the device by means of a bearing pin 20 and a slide bearing 22.
  • the leaf spring 19 is from a voice coil system 23 with a
  • Vibrating armature system 23 generated angular vibrations are transferred to the collet 14.
  • the collet 14 rotates about the vertical axis 6 in accordance with the angular vibrations generated by the swing armature system 23 6 vibrations is + / - 1.0 °, since only a very small swivel angle ensures that the dental treatment is painless for the patient.
  • a large adjustment arc of the torsional moment transmitted by the collet 14 inevitably leads to the fact that these are transmitted to the tooth stump 1. However, this must be avoided because it is too large
  • the torsional moment generated by the angular vibrations and transmitted from the collet 14 to the prosthetic part 3 about the vertical axis 6 rather serves to destroy the cement layer 4 in order to be able to remove the prosthetic part 3 from the tooth stump 1 without pain for the patient.
  • the prosthetic part 3 is not damaged, so that it can be used again.
  • FIG. 3 the connecting section between the collet 14 and the prosthetic part 3 is shown enlarged by the positive and non-positive connection
  • the collet 14 encompasses the tooth flanks essentially completely in the circumferential direction of the prosthetic part 3 in order to produce this operative connection.
  • the collet 14 is arranged between the plane formed by the transverse and longitudinal axes 7 and 8 and the occlusal surface of the prosthetic part 3.
  • the positive connection between the collet 14 and the prosthetic part 3 is such that the collet 14 completely encloses the prosthetic part 3 not only in the circumferential direction but also in the longitudinal direction and thus the outer surface of the prosthetic part 3 is gripped by the collet 14.
  • a dentofoil insert 10 can be provided between the collet 14 and the prosthetic part 3 in order to avoid damage due to friction.
  • the collet 14 is fixed in the holding member receptacle 15 and can be replaced at any time in a simple and quick manner, so that different sized prosthetic parts 3 can be detached from the cement layer 4 with a device 11. 7
  • the torsion moment around the vertical axis 6 is between for medical reasons
  • Cement layer 4 is given. At lower or higher frequencies for the necessary torsional moment there is a risk that the cement layer 4 is not loosened or the prosthetic part 3 is damaged with pain for the patient, since too high a frequency generates too great a torsional moment which is not suitable for such treatments. It is important that the torsional moment occurs exclusively in the cement layer, which is 20 to 80 ⁇ m thick, and is not transferred to the tooth stump 1, since only this type of treatment ensures painless removal of the crown 3 '.
  • the holding member 13 is designed as a bridge insert 31 in order to enable a plurality of prosthetic parts 3 which are connected to one another to be released.
  • the bridge insert 31 comprises a clamping slide 32 which is rotatably mounted in the housing 12 by means of locking balls 33 in the holding member receptacle 15.
  • the clamping slide 32 is placed in the same way on the prosthetic part 3 in a positive and non-positive manner, as is customary in the collet 14 for individual tooth crowns 3 '. Only the structural design of the clamping slide 32 is adapted to the geometric dimensions of the bridge structure.
  • the generated and transmitted torsional moment also acts about the vertical axis 6 of each individual tooth stump 1, so that due to the selected deflection of + / - 1.0 ° and the set frequency in the range from 20 to 200 Hz, the thin cement layer 4 is destroyed and thereby the Bridge can be removed from the tooth stumps 1 to be protected.
  • the clamping slide 32 is first pushed over the bridge 3 ", so that the flanks of the prosthetic parts 3 are encompassed in the direction of the longitudinal axis 7.
  • the t-shaped web of the clamping slide 32 is then inserted into one with the latter Corresponding recess of the holding member 13 pushed so that a non-positive operative connection is made between the clamping slide 32 and the holding member 13.
  • FIG. 6 shows the positive connection between the collet 14 and the prosthetic part 3 in its circumferential direction. It is shown that the 8 collet 14 bears at least four positions on the prosthetic part 3 and thus a force transmission takes place as a torsional moment about the vertical axis 6.
  • the vibrating armature system 23 drives one by means of a pin 24 in the
  • a leaf spring 19 is arranged between the collet 14 and the rocker arm 27, which accomplishes the power transmission from the motor 23 to the collet 14.
  • the motor is designed as a DC motor 30 with a gear 28 and 29.
  • the DC motor 30 generates the predetermined angular vibrations, which are transmitted to the rocker arm 27 and thus to the leaf spring 19 via a universal joint 28 and an eccentric disk 29.
  • the deflection of the leaf spring 19 - shown in dash-dotted lines - corresponds to the predetermined adjustment curve of + / - 1.0 °.
  • FIGS. 8 and 9 show different collets 13 which can be adapted to different prosthetic parts 3, since individual human teeth have different geometrical dimensions.
  • the opening and the shape of the collet 13 for a molar or an anterior tooth are matched to this respective tooth shape and size in order to ensure the positive and non-positive connection in the fitted state of the collet 13 on these prosthetic parts.

Landscapes

  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dental Prosthetics (AREA)

Abstract

Pour détacher un élément prothétique (3) fixé à un moignon de dent (1), il est nécessaire de détruire, sans provoquer de douleurs et de façon simple, l'assemblage entre l'élément prothétique (3) et le moignon de dent (1). Cette opération comprend plusieurs étapes : pose d'un organe de maintien (13) sur l'élément prothétique (3) de façon à créer une liaison bloquée en rotation entre l'organe de maintien (13) et l'élément prothétique (3) ; mise en marche d'un moteur d'entraînement (23, 30) raccordé à l'organe de maintien (13) ; production d'oscillations autour de l'axe vertical (6) de l'élément prothétique (3) au moyen du moteur d'entraînement (23, 30) et d'un ou plusieurs organes de liaison (19, 20, 22, 27, 28, 29) placés entre le moteur d'entraînement (23, 30) et l'organe de maintien (13) ; transmission des oscillations à l'élément prothétique (3) au moyen de l'organe de maintien (13) de façon à détacher une couche de ciment ou de colle (4) entre l'élément prothétique (3) et le moignon de dent (1), par l'intermédiaire du moment de torsion produit par les oscillations autour de l'axe vertical (6) de l'élément prothétique (3) ; et retrait de l'élément prothétique (3) du moignon de dent (1) après destruction de la couche de ciment ou de colle (4).
EP99920834A 1998-05-07 1999-05-03 Procede et dispositif pour detacher un element prothetique fixe a un moignon de dent Withdrawn EP0994678A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19820352 1998-05-07
DE1998120352 DE19820352A1 (de) 1998-05-07 1998-05-07 Verfahren und Vorrichtung zum Lösen von einem mit einem Zahnstumpf fest verbundenen Prothetikteil
PCT/EP1999/002978 WO1999056656A1 (fr) 1998-05-07 1999-05-03 Procede et dispositif pour detacher un element prothetique fixe a un moignon de dent

Publications (1)

Publication Number Publication Date
EP0994678A1 true EP0994678A1 (fr) 2000-04-26

Family

ID=7866932

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99920834A Withdrawn EP0994678A1 (fr) 1998-05-07 1999-05-03 Procede et dispositif pour detacher un element prothetique fixe a un moignon de dent

Country Status (3)

Country Link
EP (1) EP0994678A1 (fr)
DE (1) DE19820352A1 (fr)
WO (1) WO1999056656A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101426380B1 (ko) 2013-07-15 2014-08-05 (주)한국원자력 엔지니어링 치과용 크라운 제거장치

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2630272C2 (de) 1976-07-06 1982-05-06 Mark 5090 Leverkusen Rom Zahnärztliches Instrument zum Lösen von Kronen- oder Brückenersatz
DE8509768U1 (de) * 1985-04-01 1985-05-15 Schramm, Heinrich Wilhelm, 4803 Steinhagen Vorrichtung zum Entfernen von Zahnkronen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9956656A1 *

Also Published As

Publication number Publication date
WO1999056656A1 (fr) 1999-11-11
DE19820352A1 (de) 1999-11-18

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