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WO2008128946A1 - Appareil d'usinage destiné à la production d'articles de prothèse dentaire, procédé et logiciel destinés à détecter l'identifiant d'une pièce - Google Patents

Appareil d'usinage destiné à la production d'articles de prothèse dentaire, procédé et logiciel destinés à détecter l'identifiant d'une pièce Download PDF

Info

Publication number
WO2008128946A1
WO2008128946A1 PCT/EP2008/054627 EP2008054627W WO2008128946A1 WO 2008128946 A1 WO2008128946 A1 WO 2008128946A1 EP 2008054627 W EP2008054627 W EP 2008054627W WO 2008128946 A1 WO2008128946 A1 WO 2008128946A1
Authority
WO
WIPO (PCT)
Prior art keywords
workpiece
value
identifier
character
machining apparatus
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
Application number
PCT/EP2008/054627
Other languages
German (de)
English (en)
Inventor
Norbert Ulmer
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.)
Sirona Dental Systems GmbH
Original Assignee
Sirona Dental Systems GmbH
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 Sirona Dental Systems GmbH filed Critical Sirona Dental Systems GmbH
Publication of WO2008128946A1 publication Critical patent/WO2008128946A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like
    • A61C13/0004—Computer-assisted sizing or machining of dental prostheses
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
    • G06V30/10—Character recognition
    • G06V30/24—Character recognition characterised by the processing or recognition method
    • G06V30/242—Division of the character sequences into groups prior to recognition; Selection of dictionaries
    • G06V30/244—Division of the character sequences into groups prior to recognition; Selection of dictionaries using graphical properties, e.g. alphabet type or font
    • G06V30/245—Font recognition
    • G—PHYSICS
    • G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
    • G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
    • G16H20/00—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance
    • G16H20/40—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture

Definitions

  • the invention relates to machining apparatus for the production of dental prosthetic items from a workpiece, said apparatus comprising a workholding device for the workpiece, and an identifier containing information concerning the workpiece being disposed on said workpiece, and a recognition unit being provided for the detection of the identifier on the workpiece mounted in the workholding device, while an image recognition unit adapted to detect an identifier consisting of a sequence of alphabetic and numeral characters located on the workpiece is allocated to said recognition unit.
  • the invention relates to a method for the detection of a character string consisting of alphabetic and/or numeral characters of an identifier on workpieces in a machining apparatus for the manufacture of dental prosthetic items, in which method the character string is scanned by means of a recognition unit.
  • the invention also relates to software for an aforementioned machining apparatus, which puts an aforementioned method into effect.
  • a scanning unit for scanning templates for the production of dental prosthetic items from blanks is disclosed in DE 102 33 314 Al.
  • Said scanning unit has means available for detecting an identifier containing information concerning the workpiece or for the readout of information contained therein.
  • Said means for detecting the identifier corn-prise a sensor, which detects an identifier located on the work- piece in the form of, say, differences in brightness or differences in height.
  • Said means can alternatively be in the form of image recognition means adapted to detect, say, an identifier applied to the workpiece in the form of differences in brightness or alternatively in the form of a sequence of alphabetic or numeral characters as image.
  • the information obtained from the identifier is implemented for the calculation of the prosthetic item to be produced and for the control of the machining apparatus and can be used for documentation purposes.
  • Considerable advantages can be achieved with regard to the control of machining apparatus when, in particular, information contained in the identi- bomb is taken into consideration, such advantages residing, for example, in the adjustment of the rate of advance as a function of the material used or the possibility of making allowance for minimum wall thicknesses as a function of the strength of the material, when designing the prosthetic i- tern.
  • the object of the invention is to develop a recognition u- nit such that checking of the identifiers is made possible.
  • optical character recognition means OCR
  • OCR optical character recognition means
  • Said character value or word value can be compared with a single reference character value or reference word value. Furthermore, the object is achieved according to the invention in that, after the insertion of the workpiece in a machining apparatus, the character string is scanned by means of a recognition unit and then an absolute character value or word value is assigned to said character string by means of OCR, and said character value or word value is compared with a reference character value or reference word value, and the machining operation of the machining apparatus is stopped or not started if there is a discrepancy between the value read and the reference value.
  • This ensures that only workpieces having a specified character identifier are machined. According to trademark law, the workpieces or blanks may not be furnished with a character identifier configured as a trademark without permission.
  • the object is achieved with a software program for a previously described machining apparatus, which software program puts the previously described method into ef- fect .
  • Said software program can be included in the recognition unit by the manu-facturer so that obligatory checking of the workpiece takes place.
  • Fig. 1 shows a diagrammatic assembly of a machining apparatus of the invention comprising a recognition unit of the invention and a computer connected thereto;
  • Fig. 2 shows a detailed view of the machining apparatus in the region of the machining chamber.
  • a machining apparatus 1 comprising a machining chamber 2 is connected to a computer (PC) 4 via a connecting cable 3, is shown in Fig. 1.
  • the computer can alternatively be integrated in the housing of the machining apparatus.
  • the PC 4 is equipped with input means in the form of a keyboard and output means in the form of a monitor 6. Data required for the operation of the machining apparatus can be transferred via the connecting cable 3.
  • Machining of a workpiece takes place in the machining chamber 2. If necessary, scanning either of a template for the production of a copy thereof or of a three-dimensional geometry to be complemented by the prosthetic item to be pro- prised, or scanning in order to establish the position of the workpiece to be machined can be undertaken. Furthermore, an identifier is recorded.
  • a subregion of the machining chamber 2 is shown in detail in Fig. 2.
  • At least one tool 14, for example, a grinding pin 15, is located in the machining room 2, which tool ef- fects abrasion of the material when it contacts the blank 11, for which purpose it is caused to rotate rapidly.
  • a recognition unit 16 configured as a distance-measuring sensor in the exemplary embodiment, is provided in the machining chamber 2.
  • Said recognition unit 16 comprises a radiation emitter 17 from which a measuring beam is emitted, and a radiation detector 28 impinged on by a received beam reflected or back-scattered from the blank 11.
  • the recognition unit 16 is displaceable relatively to the blank 11, as indicated by the arrow 19.
  • a suitable rec- ognition unit is illustrated and explained in EP 1 093 768 A2 and the embodiments therein are included herein by reference. Other recording units can be used to detect the i- dentifier, if desired.
  • the blank is selected with regard to its shape and size so that the required shaped part 21 can be machined from the blank 11.
  • the blank 11 can have an identifier 23 containing material-specific information and other information.
  • the identifier 23 is embodied as a bar code, in which the width of, as well as the distance between, the individual bars represents a specific character string.
  • the bars and the intervals can be scanned by a barcode reader on the basis of their various degrees of brightness and translated into analyzable data by software.
  • the bars are generally imprinted on the blank or on the holder.
  • Signals detected by the recognition unit 16 are transmitted via a connecting cable 20 to the machining apparatus and, if appropriate, after preprocessing, from the machining apparatus to the computer 4 via the connecting cable 3 (Fig. 1) .
  • the recognition unit 16 for detecting the identifier 22 is allocated to optical character recognition means (OCR) included in the computer 4.
  • OCR optical character recognition means
  • individual characters are identified in the image scanned by the recognition unit and an absolute character value is assigned thereto.
  • at least one word value can also be determined from the character values . After the character value has been assigned, it is compared with a reference value. If there is a discrepancy between the word value assigned to the character string and the reference value, the machining operation of the machining apparatus? is stopped or not started.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Public Health (AREA)
  • Animal Behavior & Ethology (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Character Discrimination (AREA)

Abstract

La présente invention concerne un appareil d'usinage (1) destiné à la production d'articles de prothèse dentaire à partir d'une pièce à usiner (11). L'appareil comprend : un dispositif porte-pièce (13) destiné à la pièce à usiner (11); un identifiant (22) contenant des informations sur la pièce à usiner; et une unité de détection (16) servant à détecter l'identifiant (22). Une unité de détection d'image, située sur la pièce à usiner et conçue pour détecter un identifiant (22) constitué d'une séquence de caractères alphabétiques ou numériques, est installée sur l'unité de détection (16). La séquence de caractères reçoit une valeur de caractère ou de mot absolue au moyen d'une OCR. La valeur de caractère ou la valeur de mot est comparée à une valeur de caractère de référence ou à une valeur de mot de référence, et l'opération d'usinage de l'appareil d'usinage (1) est arrêtée ou ne démarre pas lorsqu'il existe un écart entre ladite valeur et la valeur de référence.
PCT/EP2008/054627 2007-04-18 2008-04-17 Appareil d'usinage destiné à la production d'articles de prothèse dentaire, procédé et logiciel destinés à détecter l'identifiant d'une pièce Ceased WO2008128946A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US90782607P 2007-04-18 2007-04-18
DE102007018594A DE102007018594A1 (de) 2007-04-18 2007-04-18 Bearbeitungsvorrichtung zur Herstellung von dentalen Passkörpern sowie Verfahren und Software zum Erfassen einer Kennung von Werkstücken
US60/907,826 2007-04-18
DE102007018594.6 2007-04-18

Publications (1)

Publication Number Publication Date
WO2008128946A1 true WO2008128946A1 (fr) 2008-10-30

Family

ID=39777340

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/054627 Ceased WO2008128946A1 (fr) 2007-04-18 2008-04-17 Appareil d'usinage destiné à la production d'articles de prothèse dentaire, procédé et logiciel destinés à détecter l'identifiant d'une pièce

Country Status (2)

Country Link
DE (1) DE102007018594A1 (fr)
WO (1) WO2008128946A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160067017A1 (en) * 2007-07-31 2016-03-10 Sirona Dental Systems Gmbh Blank with encoding and method of manufacturing a molded dental component
US9492251B2 (en) 2010-03-16 2016-11-15 Sirona Dental Systems Gmbh Blank with coding for the production of tooth-technical shaped parts and procedures for the identification of a blank

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001032093A1 (fr) * 1999-11-02 2001-05-10 Jeneric/Pentron Incorporated Blocs pour cfao destinés à la fabrication de matériaux dentaires
DE10233314A1 (de) * 2002-07-22 2004-02-12 Sirona Dental Systems Gmbh Vermessungseinrichtung für eine Vorlage und damit versehene Bearbeitungsmaschine
EP1658825A1 (fr) * 2004-11-22 2006-05-24 3M Espe AG Système et procédé de fabrication de prothèses dentaires
WO2007025997A1 (fr) * 2005-09-01 2007-03-08 Sirona Dental Systems Gmbh Ebauche pour une partie de rechange comprenant des informations necessaires pour le traitement et procede de fabrication associe

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340200C2 (de) * 1993-11-25 1998-07-23 Dekema Dental Keramikoefen Gmb Anordnung zur Wärmebehandlung von Gegenständen, insbesondere von Zahnersatz oder -teilersatz
DE19950780C2 (de) 1999-10-21 2003-06-18 Sirona Dental Systems Gmbh Verfahren und Vorrichtung zur Erfassung medizinischer Objekte, insbesondere von Modellen präparierter Zähne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001032093A1 (fr) * 1999-11-02 2001-05-10 Jeneric/Pentron Incorporated Blocs pour cfao destinés à la fabrication de matériaux dentaires
DE10233314A1 (de) * 2002-07-22 2004-02-12 Sirona Dental Systems Gmbh Vermessungseinrichtung für eine Vorlage und damit versehene Bearbeitungsmaschine
EP1658825A1 (fr) * 2004-11-22 2006-05-24 3M Espe AG Système et procédé de fabrication de prothèses dentaires
WO2007025997A1 (fr) * 2005-09-01 2007-03-08 Sirona Dental Systems Gmbh Ebauche pour une partie de rechange comprenant des informations necessaires pour le traitement et procede de fabrication associe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160067017A1 (en) * 2007-07-31 2016-03-10 Sirona Dental Systems Gmbh Blank with encoding and method of manufacturing a molded dental component
US10149746B2 (en) * 2007-07-31 2018-12-11 Dentsply Sirona Inc. Method of manufacturing a molded dental component from a blank
US9492251B2 (en) 2010-03-16 2016-11-15 Sirona Dental Systems Gmbh Blank with coding for the production of tooth-technical shaped parts and procedures for the identification of a blank
US10045840B2 (en) 2010-03-16 2018-08-14 Sirona Dental Systems GMBH. Blank with coding for the production of tooth-technical shaped parts and procedures for the identification of a blank

Also Published As

Publication number Publication date
DE102007018594A1 (de) 2008-10-30

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