WO2007117239A1 - Procédé et système de production automatique en masse de répliques dentaires sur mesure destinés à être utilisés dans la fabrication de prothèses dentaires - Google Patents

Procédé et système de production automatique en masse de répliques dentaires sur mesure destinés à être utilisés dans la fabrication de prothèses dentaires Download PDF

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Publication number
WO2007117239A1
WO2007117239A1 PCT/US2006/013386 US2006013386W WO2007117239A1 WO 2007117239 A1 WO2007117239 A1 WO 2007117239A1 US 2006013386 W US2006013386 W US 2006013386W WO 2007117239 A1 WO2007117239 A1 WO 2007117239A1
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WO
WIPO (PCT)
Prior art keywords
digital
model
dental
tooth
models
Prior art date
Application number
PCT/US2006/013386
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English (en)
Inventor
Duane M. Durbin
Dennis A. Durbin
Original Assignee
Ios Technologies, Inc.
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 Ios Technologies, Inc. filed Critical Ios Technologies, Inc.
Priority to CA002648922A priority Critical patent/CA2648922A1/fr
Priority to EP06769812A priority patent/EP2004087A1/fr
Priority to PCT/US2006/013386 priority patent/WO2007117239A1/fr
Publication of WO2007117239A1 publication Critical patent/WO2007117239A1/fr

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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

Definitions

  • the present invention relates to utilizing digital dental models to directly manufacture custom tooth die models that can be used as a pattern to fabricate dental prosthetics such as crowns.
  • a physical model of a patient's teeth is needed that faithfully reproduces the patient's teeth and other dental structures, including the jaw structure
  • a three-dimensional negative model of the teeth and other dental structures is created during an impression-taking session where one or more trays are filled with a dental impression material and the tray is then placed over the teeth to create a negative mold. Once the impression material has hardened, the tray of material is removed from the teeth and a plaster like material is poured into the negative mold formed by the impression. After hardening, the poured plaster material is removed from the impression mold and, as necessary, finish work is performed on the casting to create the final physical model of the dental structure.
  • a physical model will include at least one tooth and the adjacent region of gingiva. Physical models may also include all of the teeth of a jaw, the adjacent gingiva and, for the upper jaw, the contour of the palate.
  • Dental laboratories typically use the physical model as a pattern for the fabrication and fitting of a variety of precision fitted dental prosthetic devices such as crowns, bridges, retainers and veneers. Often, the technician performs a significant amount of work on the physical model to prepare it for use as the pattern for the dental fabrication. For example, when a single tooth crown is to be made, the technician will perform a number of operations to isolate and remove the tooth of interest from the
  • the technician will then drill a hole and install a coated pin at the bottom of the tooth model (die) of interest.
  • the pin provides a means of handling the isolated tooth die during the subsequent steps involved in the crown being fabricated.
  • the pinned model is then placed on the top of a base mold tray that has been filled with unhardened plaster material After the material hardens, the model is now attached to the base form with, the coated pin embedded in the base mold.
  • the technician then makes two vertical cuts on each side of the pinned tooth model being careful not to cut or remove material from the tooth model of interest or the adjacent teeth of the model. Because the pin was coaled, the plaster material does not adhere to the pin and the cutout tooth die can now be removed from the model/base assembly.
  • the pinned tooth die can now be used as the model to fabricate the crown.
  • the crown will be installed on the tooth die and placed back on the model/base assembly to verify the fit of the crown with the adjacent teeth.
  • the process of cutting the tooth of interest out of the model/base assembly creates the opportunity to damage either the tooth of interest or the adjacent teeth in the model, which results in a potentially poor fitting crown in the patient.
  • Automated dental structure scanning techniques have been developed as alternatives to the mold casting procedure. Because these techniques can create a direct digital representation of the dental structures, they provide the advantage of creating an "electronic impression" that is immediately transmittable from the patient to a dental Computer Aided Design (CAD) system and, after review and annotation by a dentist, to a dental laboratory. The digital transmission potentially diminishes inconvenience for the patient and eliminates the risk of damage to the impression mold.
  • CAD Computer Aided Design
  • U.S. Patent No. 6,364,660 discloses a method and apparatus for mapping the structure and topography of dental formations such as peridontium and teeth, both intact and prepared, for diagnosis and dental prosthetics and bridgework by using an intra-oral imago scanning technique.
  • the method can provide a digital 3D model that captures details of orally situated dental formations thus enabling diagnosis and the preparation of precision moldings and fabrications that will provide greater comfort and longer wear to the dental patient.
  • CAD computer aided design
  • CIM Computer Integrated Manufacturing
  • a method for using a digital dental model allowing authorized users to specify the dental area of interest; isolating the specified dental area of interest from the original digital dental model; creating a new 3D digital model file for the isolated tooth area of interest; creating a digital isolated tooth die model by appending to the isolated tooth 3D model file either 1) a 3D digital model file of a base with a mounting post or stem, or 2) a base with a hole sized to receive a pre-fabricated mounting post or stem, with such mounting post, stem or hole dimensioned to the base of the isolated dental area; creating physical models of both the original digital dental model and the digital isolated tooth die model; and archiving the digital models.
  • Implementations of the above aspect may include one or more of the following.
  • a dental Computer Aided Design (CAD) system can be used to view the digital dental model and select the teeth that need to be isolated. The dental CAD system can then create 3D digital tooth die models for the selected teeth.
  • a Computer Integrated Manufacturing (CIM) system can create physical study models representative of the original digital dental model and the digital tooth die models.
  • Figure 1 is a block diagram illustrating an exemplary environment for viewing, altering, and archiving digital models of dental structures and for supporting computer integrated manufacturing of physical models of the dental structures using the digital
  • Figure 2 shows a system and method for viewing digital dental models and performing treatment planning.
  • Figure 3 shows a process to edit a digital model of a tooth.
  • Fig. 4 illustrates an example of a digital model for an isolated tooth die with a base that includes a mounting post or stem.
  • Figure 5 illustrates an example of a digital model for an isolated tooth die with a base that includes a hole for receiving a pre-fabricated mounting post or stem.
  • Figure 1 is a block diagram that illustrates an exemplary environment for viewing, altering, and archiving digital models of dental structures and for supporting computer integrated manufacturing of physical models of the dental structures using the digital model files.
  • data obtained by an intra-oral scanner 102 of the dental structures is used to create a 3D digital dental model that is representative of the surface contour of the scanned dental structures.
  • Descriptions of the method and apparatus to obtain this digital dental model arc described in U.S. Patent No. 6,364,660, the contents of which are incorporated by reference herein.
  • the data representing the digital dental working model from the scanner 102 is transferred over a wide area network 110 such as the Internet to a dental laboratory facility 130 with computer aided manufacturing capabilities.
  • a dental laboratory technician may view the digital dental model and select those teeth for which a tooth die model is desired.
  • the Dental CAD System 104 would then create 3D digital isolated tooth die models of the selected, teeth.
  • the technician could then select which of the digital models should be fabricated into ph aysical model utilizing methods and technologies such as Stereo Lithography Apparatus (SLA).
  • SLA Stereo Lithography Apparatus
  • a CIM fabricated isolated tooth die model would be used as a pattern to fabricate a prosthetic such as a crown that would then be shipped directly back to the dentist 106.
  • the dentist 106 may transfer the digital dental model file to CIM a facility 120.
  • the ClM facility 120 may choose to make dentist-sanctioned modifications to the digital duntal model and then fabricate the physical replicates of the digital dental model and the digital isolated tooth die model following the processes described previously for the dental laboratory 130. Once the physical models of the digital dental model and the digital isolated tooth die model are made, the physical models would be shipped to the requested dental laboratory 130 for prosthetic fabrication.
  • the system of Figure 1 integrates the creation of digital dental models with CIM to fabricate accurate physical model representations of the digital models.
  • the invention addresses the ClM of physical models ranging from an individual isolated tooth die model to a dental model comprised of all the teeth in the jaw.
  • the CIM technologies that are suitable for fabrication of physical models of the digital models includes, but is not limited to stereo lithography apparatus (SLA), computer numeric controlled (CNC) machining, electro -discharge machining (EDM), and Swiss Automatics machining.
  • SLA stereo lithography apparatus
  • CNC computer numeric controlled
  • EDM electro -discharge machining
  • Swiss Automatics machining SLA equipment and 3D printers such as the ThermoJet printer are available from 3D Systems, Inc. of Valencia, CA that allows CAD users the freedom to quickly "print” and hold a 3-dimensional model in their hands.
  • three-dimensional shape model data is converted into contour line data and sectional shapes at respective contour lines are sequentially laminated to prepare a cubic model.
  • Each cubic ultraviolet-ray curable resin layer of the model is cured under irradiation of a laser beam before the next layer is deposited and cured.
  • Each layer is in essence a thin cross-section of the desired three-dimensional object.
  • a tliin layer of viscous curable plastic liquid is applied to a surface which may be a previously cured layer and, after sufficient time has elapsed for the thin layer of polymcriwiblc liquid to smooth out by gravity, a computer controlled beam of radiation is moved across the thin liquid layer to sufficiently cure the plastic liquid so that subsequent layers can be applied thereto,
  • the waiting period for the thin layer to level varies depending on several factors such as the viscosity of the polymerizable liquid, the layer thickness, part geometry, and cross- section, and the like.
  • the cured layer which is supported on a vertically movable object support platform, is dipped below the surface of a bath of the viscous polymerizable liquid a distance greater than the desired layer thickness so that liquid flows over the previous cross-section rapidly. Then, the part is raised to a position below the surface of the liquid equal to the desired layer thickness, which forms a bulge of excess material over at least a substantial portion of the previous cross-section.
  • the layer is ready for airing by radiation.
  • An ultraviolet laser generates a small intense spot of UV which is moved across the liquid surface with a galvanometer mirror X-Y scanner in a predetermined pattern.
  • stereolithography equipment automatically builds complex three-dimensional parts by successively airing a plurality of thin layers of a curable medium on top of each other until all of the thin layers are joined together to form a whole part such as a dental model.
  • each patient's dental model is unique and these models are typically manufactured one at a time by a skilled dental technician.
  • the use of SLA allows for the mass manufacturing of patient dental models since the platform can be sectioned into grids where each grid can support a unique set of dental model parts.
  • these unique grid model parts can be serialized during manufacturing to allow tracking of individual parts throughout the dental laboratory process.
  • three unique physical models would be made: 1) A physical model of all or part of the teeth and adjacent gingiva in the digital dental model derived from scanning the dental structures in the upper jaw; 2) A physical model of all or part of the teeth and adjacent gingiva in the digital dental model derived from scanning the dental structures in the lower jaw; and 3) A physical model of the digital isolated tooth die model for the tooth being crowned.
  • the upper and lower jaw physical models would be fabricated with index marks allowing the lab technician or dentist to align the physical models in the proper occlusal relationship.
  • the crown can be checked for fit by seating it on the corresponding tooth location of the physical model created from the digital dental model for the upper or lower jaw. This allows for an accurate check of both adjacent tooth interference and occlusal fit of the fabricated crown prosthetic prior to shipping the crown prosthetic to the dentist.
  • a dental CAD system 200 for viewing digital dental models and performing treatment planning is presented.
  • Data from an intra-oral dental scanner 102 is processed by a 3D image and dental model engine 202 and displayed as a scaled 3D view of the dental structures.
  • the 3D image and dental model engine 202 also assesses the quality of the acquired digital dental model and can display to the user highlighted regions where the digital dental model reflects an anomalous surface contour, or where uncertainties in the calculated estimate of the surface contour exceeds a user specified limit.
  • the output of the 3D image- and dental model engine 202 is provided to a display driver 203 for driving a display or monitor 205,
  • the 3D image and dental model engine 202 communicates with a user command processor 204, which accepts user commands generated locally or over the Internet.
  • the user command processor 204 receives commands from a local user through a mouse 206, a keyboard 2OH, or a stylus pad 210 or joystick 211. Additionally, a microphone 212 is provided to capture user voice commands or voice annotations. Sound captured by the microphone 212 is provided to a voice processor 214 for convening voice to text. The output of the voice processor 214 is provided to the user command processor 204.
  • the user command processor 204 is connected to a data storage unit 218 for storing files associated with the digital dental models.
  • the dental CAD system 200 also provides the user with tools to perform a variety of treatment planning processes using the digital dental models.
  • Such planning processes include measurement of arch length, measurement of arch width and measurement of individual tooth dimensions.
  • a tooth isolation is prepared by cutting the tooth involved with the dental treatment out of a cast model made from an elastomer impression.
  • a process discussed next provides an alternative process that utilizes a digital dental model and the dental CAD system 200 to prepare a 3D digital model of a tooth isolation. Using this process, an operator utilizes the CAD system 200 to isolate the tooth from the complete digital dental model and then creates a digital model of just the single tooth.
  • the routine or process 500 io edit a digital dental model is disclosed in more detail.
  • the digital dental model is displayed (step 502).
  • the process checks if one or more teeth in the digital dental model has been selected (step 504). If not, the routine simply exits.
  • the routine highlights the tooth model (506).
  • the parameters can be set a of points delineating one or more cutting planes separating one tooth from its neighboring teeth.
  • the parameter can simply be s aelection of p aarticular tooth model which has already been embedded with dimensional information about the tooth so that 3D data on the selected tooth can be retrieved from a file.
  • the routine determines if the tooth model or object has been moved or digitally edited (step 50B), If so, the routine updates the dimensions and key points of the tooth model, as well as the new location of the tooth model if it has been moved (step 510).
  • the routine can be used to design a base and a mounting post or stem on the tooth model, for example.
  • the routing can be used to design a base and a hole in the base for receiving a pre-fabricated mounting post or stem.
  • the routine deselects the tooth model and exits the edit routine. If the tooth model has not been moved or stretched, the routine tests if selected tooth model(s) is/are to be copied (step 512).
  • the routine creates new tooth models or tooth object(s) based on the selected object(s) and links these new objects to existing tooth objects before exiting the routine (step 513).
  • the routine checks if the user wishes to rotate selected tooth object(s) (step 514). If I he objects are to be rotated, the routine complies with the request (step 516) where the selected objcct(s) are rotated and their new positions are noted in the linked list data structure. Afterward, the routine deselects the object(s) and exits.
  • the routine checks if the user wishes Io flip the tooth objects (step 518). If so, the routine flips them in step 520 and updates the location of the selected objects therein before exiting the routine Alternatively, from step 522, the user may wish to enter text associated with the selected objects. If so, the routine allows the user to enter text and to associate the text with the selected objects (step 524) by adding the text to the linked list data structure for the objccLs. The text entered in step 524 may include numbers as literals. After step 524, the routine deselects the object(s) and exits.
  • the routine checks if the user has assigned a number such as the length or width of the selected tooth object(s) (step 538). If so, the routine proceeds with stop 5-10.
  • the numbcr(s) entered in step 540 is/are dimensional assignments which are entered as part of the dimensions of the tooth objcct(s) and the size of the objcct(s) is/are changed.
  • the routine deselects the object(s) and exits.
  • the routine checks if the user wishes to cut the selected tooth object(s) (step 550).
  • the respective object(s) are deleted and the link associated with the element immediately prior to the first selected object is linked to the clement immediately after the last selected tooth object (step 552). Further, the data structures associated with the deleted objects are cleaned-up such that the memory allocated to the deleted objects is released back for other uses. From step 550 and step 552, the routine deselects the object(s) and exits.
  • the original data structure prior to the edit operation is temporarily archived in memory to enable the operation of the "Undo" option.
  • the "Undo" option is useful in the event that the user wishes to change his or her mind after seeing the edited tooth object(s). Voice recognition is useful for certain data entry aspects such as the entering of text annotation and the selection of components,
  • a digital model 600 of an isolated single tooth die with a mounting post or stem attached to the tooth base is shown.
  • the system of Fig. 2 is used to design a base 604 and a mounting post or stem 602 on the digital model 600 of the isolated tooth die.
  • the system of Fig. 2 is used to design a base 604 with a hole 606 shown in cross section for receiving a pre-fabricated mounting post or stem on the digital model 600 of the isolated tooth die.
  • This digital model 600 with the base 604 and either 1) the mounting post or stem 602, or 2) the hole 606 in the base 604, is referred to herein as a digital isolated tooth die model.
  • the digital file for the digital isolated tooth die model is transferred to a CIM system where a physical model of the digital isolated tooth die model is fabricated that accurately reflects tho geometry and details of the digital isolated tooth die model.
  • the fabricated physical model of the digital isolated tooth die model will be described below.

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  • 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 Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

L'invention concerne des procédés et des systèmes permettant de traiter des dents et consistant à capturer un modèle dentaire numérique pris dans une cavité orale; à modifier le modèle numérique en planifiant un traitement oui en concevant une réplique dentaire pour une prothèse dentaire; à créer des modèles physiques à partir de l'original ou des modèles numériques modifiés; et à utiliser les modèles physiques comme patron pour la fabrication et la vérification d'ajustement d'une prothèse dentaire.
PCT/US2006/013386 2006-04-11 2006-04-11 Procédé et système de production automatique en masse de répliques dentaires sur mesure destinés à être utilisés dans la fabrication de prothèses dentaires WO2007117239A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CA002648922A CA2648922A1 (fr) 2006-04-11 2006-04-11 Procede et systeme de production automatique en masse de repliques dentaires sur mesure destines a etre utilises dans la fabrication de protheses dentaires
EP06769812A EP2004087A1 (fr) 2006-04-11 2006-04-11 Procédé et système de production automatique en masse de répliques dentaires sur mesure destinés à être utilisés dans la fabrication de prothèses dentaires
PCT/US2006/013386 WO2007117239A1 (fr) 2006-04-11 2006-04-11 Procédé et système de production automatique en masse de répliques dentaires sur mesure destinés à être utilisés dans la fabrication de prothèses dentaires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2006/013386 WO2007117239A1 (fr) 2006-04-11 2006-04-11 Procédé et système de production automatique en masse de répliques dentaires sur mesure destinés à être utilisés dans la fabrication de prothèses dentaires

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WO2007117239A1 true WO2007117239A1 (fr) 2007-10-18

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CA (1) CA2648922A1 (fr)
WO (1) WO2007117239A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011057029A1 (de) 2011-12-23 2013-06-27 Degudent Gmbh Verfahren zum Herstellen eines zahntechnischen Modells, Tragplatte zur Aufnahme von einem Gebissmodell sowie zahntechnische Einrichtung
US9861457B2 (en) 2009-03-20 2018-01-09 3Shape A/S System and method for effective planning, visualization, and optimization of dental restorations

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040133293A1 (en) * 2003-01-06 2004-07-08 Durbin Duane Milford Method and system for automated mass manufacturing of custom tooth die models for use in the fabrication of dental prosthetics
US20060127856A1 (en) * 2004-12-14 2006-06-15 Huafeng Wen Accurately predicting and preventing interference between tooth models

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040133293A1 (en) * 2003-01-06 2004-07-08 Durbin Duane Milford Method and system for automated mass manufacturing of custom tooth die models for use in the fabrication of dental prosthetics
US20060127856A1 (en) * 2004-12-14 2006-06-15 Huafeng Wen Accurately predicting and preventing interference between tooth models

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9861457B2 (en) 2009-03-20 2018-01-09 3Shape A/S System and method for effective planning, visualization, and optimization of dental restorations
DE102011057029A1 (de) 2011-12-23 2013-06-27 Degudent Gmbh Verfahren zum Herstellen eines zahntechnischen Modells, Tragplatte zur Aufnahme von einem Gebissmodell sowie zahntechnische Einrichtung
WO2013092980A1 (fr) 2011-12-23 2013-06-27 Degudent Gmbh Procédé de fabrication et plateau de support servant à recevoir un modèle dentaire
US10105200B2 (en) 2011-12-23 2018-10-23 Degudent Gmbh Method for producing a dental model and carrying plate for receiving same

Also Published As

Publication number Publication date
CA2648922A1 (fr) 2007-10-18
EP2004087A1 (fr) 2008-12-24

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