WO2008128946A1 - Machining apparatus for the production of dental prosthetic items and method and software program for the detection of an identifier of a workpiece - Google Patents
Machining apparatus for the production of dental prosthetic items and method and software program for the detection of an identifier of a workpiece Download PDFInfo
- 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
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
2006.0134P WO 18.06.2007 Sirona Dental Systems GmbH -9- ABSTRACT OF THE DISCLOSURE Machining apparatus for the production of dental prosthetic items and method and software program for the detection of an identifier of a workpiece The invention relates to a machining apparatus 1 for the 5 production of dental prosthetic items from a workpiece 11, the apparatus comprising a workholding device 13 for the workpiece 11, and an identifier 22 containing information concerning the workpiece being disposed on the workpiece 11, and a recognition unit 16 being provided for the detec- 10 tion of the identifier 22 of the workpiece 11 mounted in the workholding device, while an image recognition unit adapted to detect an identifier 22 consisting of a sequence of alphabetic or numeral characters located on the work- piece is allocated to the recognition unit 16, wherein op- 15 tical character recognition means OCR are provided, by means of which individual characters of the sequence of characters can be analyzed and by means of which an abso- lute character value or word value can be assigned to the character. 20 The invention also relates to a method and a software pro- gram for the detection of a sequence of characters consist- ing of alphabetic and/or numeral characters in an identi- fier 22 for workpieces 11, the sequence of characters 22 being detected by means of a recognition unit 16, wherein 25 the sequence of characters is assigned an absolute charac- ter or word value by OCR means, the character value or word value is compared with a reference character value or ref- erence word value, and the machining operation of the ma 30 2006.0134P WO 18.06.2007 Sirona Dental Systems GmbH - 10 - chining apparatus 1 is stopped or not started when there is a discrepancy between the said value and the reference value. (Fig. 2) 5
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90782607P | 2007-04-18 | 2007-04-18 | |
| US60/907,826 | 2007-04-18 | ||
| DE102007018594.6 | 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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008128946A1 true WO2008128946A1 (de) | 2008-10-30 |
Family
ID=39777340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2008/054627 Ceased WO2008128946A1 (de) | 2007-04-18 | 2008-04-17 | Machining apparatus for the production of dental prosthetic items and method and software program for the detection of an identifier of a workpiece |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE102007018594A1 (de) |
| WO (1) | WO2008128946A1 (de) |
Cited By (2)
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001032093A1 (en) * | 1999-11-02 | 2001-05-10 | Jeneric/Pentron Incorporated | Cad/cam blocks in the manufacture of dental materials |
| DE10233314A1 (de) * | 2002-07-22 | 2004-02-12 | Sirona Dental Systems Gmbh | Vermessungseinrichtung für eine Vorlage und damit versehene Bearbeitungsmaschine |
| EP1658825A1 (de) * | 2004-11-22 | 2006-05-24 | 3M Espe AG | System und Verfahren zur Herstellung von Zahnprothesen |
| WO2007025997A1 (de) * | 2005-09-01 | 2007-03-08 | Sirona Dental Systems Gmbh | Rohling für ein zahnersatzteil mit für eine bearbeitung relevanten informationen und bearbeitungsvorrichtung und verfahren für diesen |
Family Cites Families (2)
| 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 |
-
2007
- 2007-04-18 DE DE102007018594A patent/DE102007018594A1/de not_active Withdrawn
-
2008
- 2008-04-17 WO PCT/EP2008/054627 patent/WO2008128946A1/de not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001032093A1 (en) * | 1999-11-02 | 2001-05-10 | Jeneric/Pentron Incorporated | Cad/cam blocks in the manufacture of dental materials |
| DE10233314A1 (de) * | 2002-07-22 | 2004-02-12 | Sirona Dental Systems Gmbh | Vermessungseinrichtung für eine Vorlage und damit versehene Bearbeitungsmaschine |
| EP1658825A1 (de) * | 2004-11-22 | 2006-05-24 | 3M Espe AG | System und Verfahren zur Herstellung von Zahnprothesen |
| WO2007025997A1 (de) * | 2005-09-01 | 2007-03-08 | Sirona Dental Systems Gmbh | Rohling für ein zahnersatzteil mit für eine bearbeitung relevanten informationen und bearbeitungsvorrichtung und verfahren für diesen |
Cited By (4)
| 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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