EP2162700A1 - Vorrichtung für den direkten nachweis von zahnabdrücken aus dem mund eines patienten - Google Patents
Vorrichtung für den direkten nachweis von zahnabdrücken aus dem mund eines patientenInfo
- Publication number
- EP2162700A1 EP2162700A1 EP07849724A EP07849724A EP2162700A1 EP 2162700 A1 EP2162700 A1 EP 2162700A1 EP 07849724 A EP07849724 A EP 07849724A EP 07849724 A EP07849724 A EP 07849724A EP 2162700 A1 EP2162700 A1 EP 2162700A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- patient
- mouth
- dental
- scanning
- dental arch
- 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- Withdrawn
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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C9/00—Impression cups, i.e. impression trays; Impression methods
- A61C9/004—Means or methods for taking digitized impressions
- A61C9/0046—Data acquisition means or methods
- A61C9/0053—Optical means or methods, e.g. scanning the teeth by a laser or light beam
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/245—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures using a plurality of fixed, simultaneously operating transducers
Definitions
- the more frequently used systems are based on multi image photogrammetry, laser scanning, structured light and sectioned light.
- the accuracy of the measuring system is a fundamental aspect.
- the structured light followed by the multi image photogrammetry has the best precision; laser scanning produces shadows during the model analysis which leads to out of focus images with a very low resolution.
- the sectioned light presents ambiguity when it is necessary to analyse a model which has variations of height.
- the second factor which obstacles the diffusion is the time of data acquisition and elaboration.
- the multi image photogrammetry needs different steps to elaborate the image while the other methods present lower time.
- the present invention tries to overcome the limits previously described defining a structure which is more simple from the mechanical point of view and proposes time of elaboration and realization of 3 -dimensional model inferior to those proposed as well as major accuracy.
- the new method of direct rilevation of 3-D dental die uses the structured light, simple and rapid method of form data acquisition, characterized by a data elaboration process relatively fast, low costs, while the accuracy of the final result is very high.
- the data acquisition system could be constituted by passive self-balancing arm or by a combination of constraints (turning chair, mounted on wheels and with adjustable height, which guarantees anyway the 6 degrees of freedom (a lower number of degrees of freedom would limit unusefully the patient movements), fixed on the platform made solid with the dental arch by means of a suitable mask, put in contact with the teeth by means of three or more than three points of contact with the teeth (for example, a steel wire) and fixed to the patient head (or chin) by means of belts and linked to a minisystem of detection of the shape of the teeth which can be moved both in active and passive ways inside the patient mouth, in order to allow both the identification of the position of the dental arch with respect to the x,y reference system of the minisystem of detection, operated by the physician, and
- Such minisystem could be constituted by an LCD projector or other luminous source focused in a way to project the image onto a very small surface, from one or more than one mirror suitably positioned and from at least one TV camera in a direct way or by means of optical device eventually assisted by optical fibres, which observation direction is inclined of a certain angle with respect to the projection direction.
- Projector, mirror and TV camera must be fixed between each other and movable both in active and passive modes with respect to the plane of dental arch to be examined, with micrometrical control of the position in the plane as specified previously. An angular control of the whole system could be added subsequently to such control in the plane, in order to amplify the observation capacity of this system.
- the detection system (the head) can be constituted by any other form detection system based on the usage of laser or stereophotogrametrical techniques, which is moved inside the mouth in an automatic or also manual way, but, anyway, capable to know its position in terms of relative coordinates.
- Two of these constraints, mutually orthogonal for semplicity, but not necessarily such, must lay on the last link of the self-balanced system which must be linked by means of opportune elements to the dental arch of the patient, in such a way that the eventual movements of the head of the same patient don't modify the relative position of the examined element with respect to the dental arch. Description of the preferred embodiment.
- the detecting system will be composed, in the preferred realization, by four microcameras which observe the scene from different angles directly or by means of optical devices, eventually assisted by optical fibres and connected to a PC.
- An opportune system of lenses, fixed to the projector and to the detecting system, will permit concentration and focusing at a close distance of the projected light, while the mirror or the mirrors of the light deflection will be still fixed to the whole structure.
- the same structure could be realized using optical fibres coupled with TV cameras and projector.
- Figure 1 describes a representative scheme of the various elements constituting one possible detection system.
- a cinematic self-balanced chain with 6 grades of freedom (in our case depending from the choice of the constraints of the patent application CS2006A00007, deposed on the 19/04/2006), on a plane fixed to the same dental arch (1) (upper or lower), by means of a mask ( Figure 2) blocked with strap to the head or to the chin, fixed by means of metal wires to the top of the teeth or by means of special gum supports on the gum surfaces and blocked with strap to the head or to the chin individuating the plane parallel to the same dental arch.
- the frontal part of the mask is rigidely linked to the 7° link of the self-balanced structure.
- such cinematic self-balanced chain could be substituted by another mechanism or avoided at all, simply constricting the patient to the immobility.
- Figure 3 describes one possible intraoral system, in which TV cameras are placed directly on the final element.
- the system of reading from the dental arch is placed on the last link of the robotic arm.
- the position of the four TV cameras (2) is constrained by the clearance of the mirror dimensions (3).
- the ray reflected from one or more than one mirrors covers a surface of nearly 1 cm 2 , in order to allow the scanning of at least one tooth a time.
- the TV cameras must guarantee non-interference with the beam of projected light and an optimal resolution for the registration of the various images. It leads to the fact that the central axis of the focal cone of every TV camera must be not on the tooth surface, but nearly at a half height of the tooth itself ( Figure 4) to guarantee a complete covering of the tooth to examine evidencing also the gum region.
- the optical detecting system is described: the projector (4) receives in input a signal from the PC and projects a beam of light towards the biconvex lens (5).
- the ray is directed towards the mirror (7) by means of an opportune biconcave lens (6), which allows to follow the entire beam of light exactly onto the tooth (8) to examine.
- the b/w pattern of lines having different thickness and direction is distorted by the tooth shape, allowing the reconstruction of the shape both of the tooth and of the gum. This is necessary for the reason that the observed deformation of the lines, otherwise parallel, permits, by means of a software opportunely calibrated, to correlate displacement of each line from its projection direction with the local depth of observed point.
- the four TV cameras registrate four images which after being sent to a PC are elaborated by means of software obtaining the visualization of the tooth model examined in a CAD environment.
- every of the two mother screw is divided into two halves (9), so that when they are open, the screws are free and it is possible to move freely the intraoral system in its plane, allowing, hence to the physician, to observe the entire dental arch.
- the system moves itself only under the engines commands to scan sequently every tooth so as previously individuated by the physician.
- the system will also be able, from the analysis of the detected data, to correct the position of the scanner to center every tooth, avoiding so eventual imprecision of the physician.
- the opening and the closure of the mother screws are actuated by a cam system (10), which rotation (clockwise and counterclockwise direction) controls blocking and the unlocking of the mother screws.
- the two threaded bars rotate thanks to the presence of two step motor (11) placed in an opportune mode on the two lower ends while the control of the angular position of the screws is realized by two digital encoders (12) placed on the other end of the mother screws.
- two digital encoders (12) placed on the other end of the mother screws.
- the dentist To execute the scanning of the whole dental arch, the dentist identifies the position of the teeth using the system in the navigato mode. After that, placing the intraoral system to the starting point, the x, y robot moves itself to execute automatically the exam of the dental arch. Once the scanning is over it is possibile to reconstruct the entire dental arch with the PC. The process needs a post-processing time to eliminate the excessive data and obtain as final result the model of dental arch in 3 - D. Now the dentist has all the necessary information to establish optimal form and position of various prosthesis or of the various prosthesis devices in order to obtain the desired result. The data relative to the 3-D model will be delivered to the numerical control cutter which will produce different prosthesis and eventual models.
- the prosthesis can be implanted in the oral cavity of the patient even on the same day, if the numerical control cutter are placed near, and anyway in much more short periods of time than those realizable now.
- the mouth of the patient must be well-open and to do it the opening systems already present in commerce can be used. All this permits to execute the exam in a limited but accessable space, especially where the space between one and another arch becomes very small.
- the structure results rather small, having a maximum width of 3.5 cm and a height of 1.8 cm.
- This system should respond to the space available in the oral cavity. And dimensions can be further reduced using telescopical or optical fibres.
- the patient, during the scanning process is not constrained to stay immobilized; in fact, the robotic arm moves itself together with the head of the patient.
- the support of the TV cameras must be necessarily introduced inside the oral cavity; it implies that the system can be sterilized. For this reason the support must be constructed in metal material that has to be sterilized at high temperatures.
- the problem for the TV cameras which will be extracted from their placements does not exist, while the video cameras may be taken away, and repositioned wrapped in single use sterile plastic bags to prevent cameras and relative lenses from being contaminated.
- the present invention aims to overcome the limits of the previous methodologies.
- the main constraint is time. It can be noticed how by means of this system of scanning the time of detecting is rather small because scanning is done only one time for every tooth to cover the whole dental arch.
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)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITCS20060014 ITCS20060014A1 (it) | 2006-10-27 | 2006-10-27 | Navi-robot per il rilievo del calco orale |
PCT/IT2007/000755 WO2008050373A1 (en) | 2006-10-27 | 2007-10-29 | Equipment for direct detection of dental die from the mouth of a patient |
ITCS20070047 ITCS20070047A1 (it) | 2007-10-29 | 2007-10-29 | Apparecchiatura per la rilevazione diretta di impronte dentali dalla bocca di un paziente |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2162700A1 true EP2162700A1 (de) | 2010-03-17 |
Family
ID=39083223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07849724A Withdrawn EP2162700A1 (de) | 2006-10-27 | 2007-10-29 | Vorrichtung für den direkten nachweis von zahnabdrücken aus dem mund eines patienten |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2162700A1 (de) |
WO (1) | WO2008050373A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8905757B2 (en) | 2012-12-03 | 2014-12-09 | E. Kats Enterprises Ltd. | Method and apparatus for measuring a location and orientation of a plurality of implants |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013203312B4 (de) * | 2013-02-27 | 2016-04-21 | Sirona Dental Systems Gmbh | Extraoraler Dentalscanner |
CN110368130A (zh) * | 2019-07-31 | 2019-10-25 | 上海正雅齿科科技股份有限公司 | 口扫设备、口扫方法及诊疗*** |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8719951D0 (en) * | 1987-08-24 | 1987-09-30 | Lbp Partnership | Three-dimensional scanner |
US5343391A (en) * | 1990-04-10 | 1994-08-30 | Mushabac David R | Device for obtaining three dimensional contour data and for operating on a patient and related method |
JPH06137841A (ja) * | 1992-10-29 | 1994-05-20 | Nikon Corp | 眼科測定装置 |
DE19753246C2 (de) * | 1997-12-01 | 2002-11-28 | Roland Seifert | Vorrichtung zur Bestimmung von dreidimensionalen Daten von Objekten |
US7009717B2 (en) * | 2002-08-14 | 2006-03-07 | Metris N.V. | Optical probe for scanning the features of an object and methods therefor |
ITCS20040012A1 (it) * | 2004-08-09 | 2004-11-09 | Calabrian High Tech Srl | Nuova Tecnologia per la Protesica Implantologica one-step |
US7494338B2 (en) * | 2005-01-11 | 2009-02-24 | Duane Durbin | 3D dental scanner |
-
2007
- 2007-10-29 WO PCT/IT2007/000755 patent/WO2008050373A1/en active Application Filing
- 2007-10-29 EP EP07849724A patent/EP2162700A1/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2008050373A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8905757B2 (en) | 2012-12-03 | 2014-12-09 | E. Kats Enterprises Ltd. | Method and apparatus for measuring a location and orientation of a plurality of implants |
Also Published As
Publication number | Publication date |
---|---|
WO2008050373A1 (en) | 2008-05-02 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
Effective date: 20090527 |
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AX | Request for extension of the european patent |
Extension state: AL BA HR MK RS |
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DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20100503 |
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18RA | Request filed for re-establishment of rights before grant |
Effective date: 20101030 |