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.
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- 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
The invention relates to a machining apparatus 1 for the 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, and a recognition unit 16 being provided for the detection of the identifier 22, while an image recognition unit adapted to detect an identifier 22 consisting of a sequence of alphabetic or numeral characters located on the workpiece is allocated to the recognition unit 16, wherein the sequence of characters is assigned an absolute character or word value by OCR means, the character value or word value is compared with a reference character value or reference word value, and the machining operation of the machining apparatus 1 is stopped or not started when there is a discrepancy between the said value and the reference value.
Description
Description
Machining apparatus for the production of dental prosthetic items and method and software program for the detection of an identifier of a workpiece Technical field
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.
Furthermore, 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.
Description of the prior art
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- fier 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.
It is possible for third parties to copy the identifier on the blanks and to market imitated blanks. This results in an enhanced hazard potential, because the blanks marketed by third parties do not, at least in part, comply with the material quality standards, which ultimately leads to a prosthetic item of inferior quality showing less resilience .
The object of the invention is to develop a recognition u- nit such that checking of the identifiers is made possible. Summary of the invention
The object is achieved according to the invention in that optical character recognition means (OCR) are provided, by
means of which the individual characters of the character string can be analyzed and an absolute character value or word value can be assigned to the characters. Optical character recognition differs from image recognition in that the former always assigns an objective value, i.e., a letter or a number, to the scanned image composed of a character, such as a numeral and/or alphabetic character. Thus it is no longer necessary to compare the image or the image identifier to be checked with all possible available varia- tions of an image or image identifier. In the case of a character identifier, an absolute character value or word value is allocated to the identifier to be checked. 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.
In addition, 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.
Brief description of the drawings An exemplary embodiment of the invention is represented in the drawing, in which:
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.
Exemplary embodiment
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- duced, 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. A workpiece in the form of a blank 11 to be ma- chined, such as a blank known in the field of dental ceram-
ics, is fastened to a holder 12 and said holder 12 is secured in a workholding device 13.
Furthermore, 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.
Furthermore, 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.
Furthermore, 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.
Another identifier 22, which is configured as an image i- dentifier according to the invention and which consists of a plurality of alphabetic characters, is provided in addition to the aforementioned identifier. Said image identi- fier 22 is scanned by causing the holder 12 or the workhol- ding device 13 to rotate, starting from a reading position of the identifier 23.
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. By means of said optical char- acter recognition, individual characters are identified in the image scanned by the recognition unit and an absolute character value is assigned thereto. Furthermore, 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.
Claims
1. Machining apparatus (1) for the production of dental prosthetic items from a workpiece (11), said apparatus comprising a workholding device (13) for the workpiece (H) and an identifier (22) containing information concerning the workpiece being disposed on said workpiece (11) and a recognition unit (16) being provided for the detection of said identifier (22) of said workpiece (11) mounted in said 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 workpiece is allocated to said recognition unit (16), characterized in that optical 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 absolute character value or word value can be assigned to the character.
2. A method for the acquisition of a sequence of charac- ters consisting of alphabetic characters and/or numerals in an identifier (22) for workpieces (11) in machining apparatus (1) for the production of dental prosthetic items, wherein the sequence of characters
(22) is detected by means of a recognition unit (16), characterized in that a) the sequence of characters is assigned an absolute character value or word value by means of OCR, b) the character or word value is compared with a reference character value or reference word value, c) the machining operation of the machining apparatus (1) is stopped or not started when there is a discrepancy between said value and the reference value . A software program for machining apparatus as defined in claim (1), characterized in that the software program puts a method as defined in claim (2) into effect.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US90782607P | 2007-04-18 | 2007-04-18 | |
| DE102007018594A DE102007018594A1 (en) | 2007-04-18 | 2007-04-18 | Processing device for the production of dental fitting bodies as well as methods and software for detecting an identification of workpieces |
| US60/907,826 | 2007-04-18 | ||
| DE102007018594.6 | 2007-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008128946A1 true WO2008128946A1 (en) | 2008-10-30 |
Family
ID=39777340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2008/054627 Ceased WO2008128946A1 (en) | 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 (en) |
| WO (1) | WO2008128946A1 (en) |
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 (en) * | 2002-07-22 | 2004-02-12 | Sirona Dental Systems Gmbh | Measurement and manufacture of dental replacements or fittings from ceramic, whereby information, e.g. material shrinkage parameters, can be attached to a workpiece to be machined so that they can read in before machining |
| EP1658825A1 (en) * | 2004-11-22 | 2006-05-24 | 3M Espe AG | System and method for manufacturing dental prostheses |
| WO2007025997A1 (en) * | 2005-09-01 | 2007-03-08 | Sirona Dental Systems Gmbh | Blank for a tooth replacement piece with information relevant to a machining machining device and method therefor |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4340200C2 (en) * | 1993-11-25 | 1998-07-23 | Dekema Dental Keramikoefen Gmb | Arrangement for the heat treatment of objects, in particular dentures or partial dentures |
| DE19950780C2 (en) | 1999-10-21 | 2003-06-18 | Sirona Dental Systems Gmbh | Method and device for detecting medical objects, in particular models of prepared teeth |
-
2007
- 2007-04-18 DE DE102007018594A patent/DE102007018594A1/en not_active Withdrawn
-
2008
- 2008-04-17 WO PCT/EP2008/054627 patent/WO2008128946A1/en 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 (en) * | 2002-07-22 | 2004-02-12 | Sirona Dental Systems Gmbh | Measurement and manufacture of dental replacements or fittings from ceramic, whereby information, e.g. material shrinkage parameters, can be attached to a workpiece to be machined so that they can read in before machining |
| EP1658825A1 (en) * | 2004-11-22 | 2006-05-24 | 3M Espe AG | System and method for manufacturing dental prostheses |
| WO2007025997A1 (en) * | 2005-09-01 | 2007-03-08 | Sirona Dental Systems Gmbh | Blank for a tooth replacement piece with information relevant to a machining machining device and method therefor |
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 (en) | 2008-10-30 |
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