METHOD OF DESIGNING AND PRODUCING DENTAL IMPLANT BASED RESTORATIONS

Abstract

A method for designing and manufacturing implant based restorations is disclosed. The method involves the use of Scannable Temporary Anatomic References to provide very reliable, fixed points of reference to enable a technician to relate and superimpose the dental implant position to a pre-planned restoration with a very high degree of accuracy throughout the entire workflow. The method can be carried out by placing Scannable Temporary Anatomic References in a jaw, on teeth, and/or in implants, collecting images by scanning a mouth, relating those images to images of a appearance of desired dental implant based restoration, placing an implant in the jaw, scanning the scannable temporary anatomic references to create a new set of images, relating the images, and producing a restoration based on the images.

Claims

1. A method for designing and producing a dental implant based restoration, said method comprising the steps of preparing a mock up of the restoration, providing at least three skeletal devices comprising a threaded post and a scannable head with multiple scanning surfaces, threadably engaging a jaw with the threaded posts of the at least three skeletal devices, scanning the mouth to provide a first data set relating the existing teeth to the at least three skeletal devices, placing at least one implant in the jaw, scanning the mouth to provide second data set relating the at least one implant to the at least three skeletal devices, relating a first image generated from the first data set to an image of the mock up, relating a second image generated from the first data set to an image generated from the second dataset, and producing a restoration based on the images.

2. The method claimed in claim 1 wherein, after the first data set is collected, at least one tooth is extracted.

3. The method claimed in claim 1 wherein the at least one implant includes a scan body.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

[0042] FIG. 1 is a front view of a jaw illustrating a step in method according to the invention involving the use of tooth supported scan bodies and/or a skeletally supported scan body

[0043] FIG. 2A is a side view of a skeletally supported scan body.

[0044] FIG. 2B is a top view of a skeletally supported scan body.

[0045] FIG. 3A is a side view of a tooth supported scan body.

[0046] FIG. 3B is a top view of a tooth supported scan body.

[0047] FIG. 4A is a side view of a scan body that can be supported by an implant.

[0048] FIG. 4B is a side view of a post for securing a scan body to an implant.

[0049] FIG. 4C is a side view of the post inside of the scan body.

[0050] FIG. 4D is a side view of a scan body supported on an implant.

[0051] FIG. 4E is a body view of a scan body that can be supported by an implant.

[0052] FIG. 4F is a side view of a scan body that can be supported by an implant.

[0053] FIG. 5A is an exploded view of a prosthetic screw assembly including a scan body.

[0054] FIG. 5B is a side view of a prosthetic screw including a scan body.

[0055] FIG. 6 is a view of a verification jig.

[0056] FIG. 7A is a perspective view of an enhanced implant supported fixture mount.

[0057] FIG. 7B is a perspective view of another embodiment of an enhanced implant supported fixture mount.

[0058] FIG. 7C is a perspective view of another embodiment of an enhanced implant supported fixture mount.

DETAILED DESCRIPTION OF THE INVENTION

[0059] The instant invention involves the use of modified scan bodies in the functional implant rehabilitation of patients by providing highly reliable, reversible, fixed points of reference enabling a fully digital workflow with the most commonly occurring clinical variations which include:

VARIATION 1: The patient has a debilitated/terminal dentition that is stable and in need of complete edentulation (removal of all existing natural teeth and/or restorations);
VARIATION 2: The patient has a debilitated/terminal dentition that is unstable and in need of complete edentulation (removal of all existing natural teeth and/or restorations); and
VARIATION 3: The patient has previously had the complete removal of all natural teeth and associated restorations and either has no existing prostheses (complete removable dentures) or has existing removable prostheses that they are looking to enhance by utilizing dental implants to stabilize a removable prosthesis or convert to a fixed/non-removable prosthesis.

[0060] This invention involves the use of Scannable Temporary Anatomic References, referred to herein as S.T.A.R., to provide very reliable, fixed points of reference to enable the technician to relate and superimpose the dental implant position to a pre-planned restoration with a very high degree of accuracy throughout the entire workflow.

[0061] In FIG. 1, skeletally supported S.T.A.R.s 10 are fixed, temporarily, in the upper jaw bone. Tooth supported S.T.A.R.s 12 are fixed, temporarily, on teeth surfaces and may be cemented thereto. Both of these have a plurality of exposed surfaces which are easily seen and captured by an intraoral scanner.

[0062] Details of one example of a skeletally supported S.T.A.R. 10 are seen in FIGS. 2A and 2B. The skeletally supported S.T.A.R. 10 has a threaded post 14 for engaging a jaw bone. It is self tapping and provides highly reliable primary stability when engaged in a jaw bone. A flange (not shown) may be provided to prevent over tightening. At the other end of the skeletally supported S.T.A.R. is a head 16 which has a number of scannable surfaces created, for example, by embossing, machining, or other suitable means. Between the head 16 and the threaded post 14 is a highly polished transmucosal element 18 which seats in the soft tissue of the jaw when the threaded post 14 engages the jaw bone. It is designed to reduce trauma to the soft tissue and has a plaque resistant surface. The head 16, as shown in FIG. 2B, has a torque receiving configuration indicated at 20 for delivering the S.T.A.R. 10 into the jaw bone. It is preferred that the head 16 have a minimally reflective surface to enhance capture with an intraoral scanner. A flange may be provided to prevent over tightening.

[0063] An example of a tooth supported S.T.A.R. 30 is shown in FIGS. 3A and 3B. The S.T.A.R. 30 has a scannable head 32 which has a number of scannable surfaces created, for example, by embossing, machining, or other suitable means. The head 32 has a receptacle to aid in placement of the device on a tooth. It is preferred that the head 32 have a minimally reflective surface to enhance capture with an intraoral scanner. The underside of the S.T.A.R. may be textured to enhance bonding of the S.T.A.R. 30 to a tooth as by cement, for example.

[0064] An implant supported S.T.A.R. is indicated generally at 40 in FIGS. 4A, 4B, and 4D. The S.T.A.R. 40 has a central bore to receive a shaft 42. The lower end 44 of the shaft 42 is threaded and is operable to engage a threaded bore in an implant 46. An example of an implant supported S.T.A.R. is indicated at 50 in FIGS. 4E and 4F. The S.T.A.R. 50 has a threaded telescoping fixation screw 52 for engaging a threaded bore in an implant. At the other end of the S.T.A.R. 50 is a head 54 which would include a torque receiving configuration. The head 54 has a number of scannable surfaces created, for example, by embossing, machining, or other suitable means. It is preferred that the head 54 have a minimally reflective surface to enhance capture with an intraoral scanner. A geometric telescoping element 56 is provided between the head and the screw 52. An extended flange 58 is provided at the bottom of the head 54. The fixation screw and the geometric telescoping element 56 may be configured according to the standards adopted by a specific manufacturer.

[0065] A prosthetic screw incorporating a S.T.A.R. is indicated at 60 in FIGS. 5A and 5B. It is supported in a titanium coping 66 which is seated on an implant abutment 64 which, is turn, is supported in an implant 62. As seen in FIG. 5B, the prosthetic screw incorporating a S.T.A.R. 60 has a threaded lower portion 64. At the other end, there is a scannable head 66 which has a number of scannable surfaces created, for example, by embossing, machining, or other suitable means. The head 66 may be provided with a torque receiving configuration (not shown) for securing the prosthetic screw incorporating a S.T.A.R. 60 in the titanium coping. It is preferred that the head 66 have a minimally reflective surface to enhance capture with an intraoral scanner.

[0066] Turning now to FIG. 6, a verification jig 70 is made up of a set of modified external fixation devices 74 which support rigid bars 78. The fixation devices may be telescoped over implant supported scan bodies 72 to provide a verification jig and pathway for scanning. Given that the dimensions of these elements are known, they can be incorporated within the software algorithms as dimensional references to further improve accuracy and precision as between the actual and virtual situations. This modified external fixation device may serve as a scannable frame. This provides a stable landmark for the intraoral scanners to follow while crossing the arch, and would eliminate scanning errors brought about by the surgical alteration of the landmarks inherent in this type of procedure.

[0067] In FIGS. 7A, 7B, and 7C, three examples of enhanced implant supported fixture mounts 80, 90, and 100 are illustrated conceptually. Each has a unique geometry which may be scanned and used to convey information about the fixture mounts such as size, manufacturer, lot number, and the like. Further, or alternatively, the fixture mounts 80, 90, and 100 may have 2D or 3D indicia, generally indicated at 82, 92, and 102 which could also be used to identify the manufacturer, make, and/or model of the implant within the design software thereby reducing manual selection errors of components and connection types that might otherwise occur during the design process. This encoding may take the form of, but is not limited to, geometry and embossing. The 3D encoding can also create efficiencies with respect to inventory management and provide a quality control check in the dental laboratory reducing the frequency of manual selection errors.

[0068] Generally speaking, all S.T.A.R.s share the following common design features: titanium and/or similar alloy (the tooth supported S.T.A.R. can support an instance of being made from ceramic.), minimally reflective and provide surface features/marking intended to aid the technician and/or dentist in identifying specific features to aid superimposition. The skeletal supported S.T.A.R. would feature a self-tapping (driving) screw for optimal stability, as well as a flange to prevent over seating.

[0069] According to one example of a method according to the invention, the workflow process begins in the usual manner of diagnostics and initial restoration design following the methodology outlined above. Motivational mock-ups are used to visually communicate the proposed dental outcome directly to the patient. In the case of Variation 1, where the existing teeth are stable, these mock-ups are made in relation to the patient's existing face and/or teeth and, once they approved by the patient, serve as a blue print during the restoration design process. In this instance the teeth serve as a reference for the mock-up or trial smile.

[0070] If, however, the teeth are present but not stable enough to be used as a reference, as in Variation 2, then at least three skeletally supported S.T.A.R.s would be used to provide a reliable frame of reference.

[0071] In variations 1 and 2, prior to extractions, a minimum of three skeletally supported S.T.A.R.s are installed into the maxillary (upper jaw) and/or mandibular (lower jaw) bone, away from areas of the planned surgical guide fixation sites (if utilizing a guided technique), extraction(s), and/or alveolar bone reduction. In Variation 3, the surgeon's preferred method of surgical guide form and fixation is considered and the S.T.A.R.s are placed to avoid these fixation sites. It is very important that the surgeon adheres to this fact, as it is critical to maintaining the S.T.A.R.s as stable reference points throughout the workflow. As more and more cases are placed utilizing a guided or pre-planned technique, surgeons would be generally aware of the sites best suited for the S.T.A.R.s to be positioned. In all variations, once installed, an intraoral scan is obtained of the dental arch or arches being restored. Obtaining this scan relates the patient's existing dentition or, if edentulous, their prosthesis, to the location of the S.T.A.R.s.

[0072] In Variations 1 and 2, the teeth are extracted with/without the hard and soft tissue recontouring with care being taken not to disturb the aforementioned S.T.A.R.s. The dental implants are then placed using a guided or non-guided technique. In Variation 3, no extractions, implants are then placed using a guided or non-guided technique. In all variations, implant-supported S.T.A.R.s may then be attached to the implants (or in another instance of this invention, be one in the same as the implant delivery mechanism as described above with reference to FIGS. 4A through 4F. One benefit of having the implant fixture mount designed as a scan body is that it creates an efficiency in the workflow as the surgeon may avoid the step of removing and replacing an additional component. It is the accepted method to deliver a dental implant with a removable fixture mount which in some instances may also serve as an analogue impression coping. Once the implant has been delivered, this mount, if not already an impression coping, is removed and is replaced by an impression coping. Once placed, an analogue impression is made in the usual manner. The presence of the skeletal S.T.A.R.s would interfere with an analogue impression and thus cannot be used in an analogue approach as a reference to the original design. The instant invention overcomes this obstacle by using a digital impression technique where an implant supported scan body is placed. Again, this step is eliminated when using the Implant fixture mount S.T.A.R. invention as it would have already been in place.

[0073] In the modified implant fixture mount variation of this invention, the implant fixture mount serves as the scan body. This is analogous to the combined implant fixture mount/impression coping used by some dental implant manufacturers. These fixture mount S.T.A.R.s are designed to be fabricated in titanium and/or similar alloy, minimally reflective and provide surface features/marking intended to aid the technician and/or dentist in identifying specific features to aid superimposition. If a guided technique is employed, a flange modification to this device serves as a vertical stop and timing identifier for 3D implant installation.

[0074] Once the implants have been placed, and if the implants meet the guidelines for immediate restoration/load (adequate primary stability), the dental arch is once again scanned to include all of the skeletal and implant supported S.T.A.R.s. This provides for reproducible reference points for pre-surgical and post-surgical model superimposition as well as capturing the three-dimensional position and internal rotational positioning of the implants' internal geometry to enhance accuracy of the working virtual design model for the technician.

[0075] At this point, temporary healing collars specific to the implant system being used are placed and the surgical incisions (if any) are closed and the scans are forwarded to the dental technician to create an implant-supported prosthesis based precisely on the original design, thereby completely eliminating the lengthy conversion process. This is unique to this new methodology and its associated inventions.

[0076] The specialist or general dentist then confirms receipt and archiving of the received file(s) by the dental lab. The lab reviews the intraoral scan files for quality control purposes, verifies the inclusion of the necessary tooth/teeth, skeletal, and implant scan bodies, and notifies the general dentist or specialists if a new capture is necessary.

[0077] Once imported into the design software environment, the technician then uses the S.T.A.R.s to precisely superimpose the initial/pre-prep (before) model with virtual design and the post-op prep (after) model within the CAD software utilizing superimposition methods inclusive of, but not limited to: automatic, manual (three-point/multiple point alignment), and/or surface mapping. This ensures precision with respect to the principles of facially driven dentistry as determined by the initial motivational mock-up and its relation to the teeth and implants as established by the tooth supported scan bodies and scan body fixture mounts.

[0078] The incorporation of individual S.T.A.R. component DME files (library files of the physical specifications of tooth supported scan bodies, skeletally supported scan bodies, scan body implant fixture mounts and modified external fixation hardware) into the libraries of design software would further aid the design process in terms of both accuracy and efficiency.

[0079] The implant supported S.T.A.R.s, and associated verification jig, if used, are then removed and the patient awaits restoration fabrication and delivery.

[0080] Once the .stl files have been imported into the design environment, the technician designs/adapts the restoration to the implant platform and may further adapt to the occlusion using various methodologies (digital bite registrations, virtual articulators, motion capture technology, etc.). The restoration is then created following the recommended specifications for the material being utilized.

[0081] The technician sends the restoration to the milling station to be manufactured with the material agreed upon by the dentist and technician. A working model may also be sent to a 3D printer and printed, if the technician prefers. The model can then be fitted with the necessary implant replicas and secured using the specifications of the device being used.

[0082] If provided, the physical verification jig is checked on the 3D printed model. Temporary abutments are modified to the contours/needs of the restoration. The final restoration (provisional or final) is finished in the usual manner on the final model.

[0083] The restoration is delivered to the specialist or general dentist to be placed in the mouth, and the fit and occlusion are checked in the usual manner and adapted, if necessary.

[0084] In another instance of the invention, S.T.A.R.s may be used for highly accurate cross-mounting of dental implant cases. In the current analog method, a pick-up impression of the patient's implant prosthesis allows the dentist and technician to relate the patient's tooth position and arch form (as established by the restoration) to the implants. This is extremely important since this temporary restoration serves as a working prototype for the final restoration and encapsulates the patient's esthetic preferences and functional occlusal biomechanics. An analogous, digital method is not currently available. This invention paves the way. By modifying prosthetic screws to serve as S.T.A.R.s, the implant/abutment position can be precisely related to the patient's restoration and subsequently used to create the final restoration. This is made possible by the fact that the modified prosthetic screw secures the prosthesis in precisely the same manner as a standard prosthetic screw. Since the dimensions of the titanium cylinder are specific to the abutment geometry for a given manufacturer, it is possible to establish the abutment position highly accurately this is precisely how open/closed tray impression copings function in communicating the implant abutment in 3D space when using an analogue technique. In addition, the simultaneous capture of the dental prosthesis with these prosthetic screw S.T.A.R.s allows for highly accurate recording cross-mounting of the prosthesis, and further aids the design of the final restoration.

[0085] Another application of this invention could involve the use of technology from the motion picture industry (i.e. Motion Capture/Mocap) where fixed points of reference are placed on actors to enable the capture of their movements and fusion the with animated (CGI) characters to produce life like results. S.T.A.R.s, especially tooth and skeletal supported types, may be used in a similar manner to precisely capture any patient's specific mandibular envelope of motion and occlusal relations creating a more accurate model of the patient during the design process.

[0086] As technologies evolve, so do the possibilities, and the S.T.A.R. concept and associated inventions (e.g. skeletal, tooth supported S.T.A.R.s) allow Augmented Reality Integration to merge with dentistry and medicine alike. Augmented Reality is similar to the better-known concept of virtual reality, in which the user's vision is completely immersed in a virtual world. AR does not replace the real environment with a fabricated one. Instead, a live view of the real world is obtained and enhanced with the addition of virtual objects that appear to coexist with real objects in the scene. The virtual objects are usually intended to provide additional perceptual information to the user that would otherwise be unavailable. The exciting possibilities of augmented reality are currently entering the automotive and other industries.

[0087] AR has enormous potential in the dental industry, due to its ability to fuse 3D scan data with a view of the patient and can be used to provide visual support for diagnosis and treatment. This is all predicated on having stable points of fixed references and the S.T.A.R. inventions provide this critical element.

[0088] Possibilities include and are not limited to real-time: virtual prep guides, crown lengthening guides, bone reduction guides, other procedure/technique wizards and innovative support services.

[0089] The foregoing description of specific examples of the invention is provided to enable one skilled in the art to practice the invention. However, the methods and the devices of the invention have utility beyond that described above and may be modified without departing from the spirit and scope of the invention. In other words, the foregoing description is only intended to illustrate, but not limit, the invention.