977 results about "Dental prosthesis" patented technology

The present invention relates generally to mill blank constructions to facilitate the manufacture of dental restorations. A given mill blank is formed in a shape (i.e. with a given geometry) that has been predetermined to reduce material waste when the mill blank is machined into the final part. A set of two or more blanks each having such characteristics comprise a smart blank “library.” In one embodiment, a smart blank library includes a sufficient number of unique blanks such that, when the geometry of the designed restoration is known, the smart blank with a highest yield can be selected for use in milling the restoration. The “yield” of a given smart blank represents the amount of material of the smart blank that is actually used in the final restoration. Automated processes for smart blank inventory management and smart blank selection are also described.

A device for forming a dental prosthesis includes a support and an element which can be attached thereto, such as an impression element. The support has an anchoring part for anchoring in a bone or a master model, a shoulder with an annular shoulder surface, and a head. The impression element has an elastically deformable fixing agent. When the device is assembled, the fixing agent jams and/or latches with the support, either externally on the support, on the side of the shoulder facing the anchoring part, or in an axial hole of the support. The element can be quickly detachably connected to the support by placing it on top of the support, and can be quickly separated from the support by moving the support away. When the device is assembled, the support and the element can lay on top of each other with annular surfaces. The annular surfaces have fully circular outer edges which are visible from the outside in an approximately radial viewing direction.

Tools are described for preparing digital dental models for use in dental restoration production processes, along with associated systems and methods. Dental modeling is improved by supplementing views of three-dimensional models with still images of the modeled subject matter. Video data acquired during a scan of the model provides a source of still images that can be displayed alongside a rendered three-dimensional model, and the two views (model and still image) may be synchronized to provide a common perspective of the model's subject matter. This approach provides useful visual information for disambiguating surface features of the model during processing steps such as marking a margin of a prepared tooth surface for a restoration. Interactive modeling tools may be similarly enhanced. For example, tools for margin marking may synchronize display of margin lines between the still image and the model so that a user can interact with either or both of the visual representations, with changes to a margin reflected in both displays.

A dental block for producing a dental prosthesis comprises a green body including zirconia and having a chemical composition including increasing amounts of yttria through a thickness of the green body. The green body is substantially opaque with a substantially consistent optical characteristic of non-translucency with respect to visible light across the thickness, and is subsequently millable and sinterable to form the dental prosthesis with an optical characteristic of increasing translucency through a thickness of the dental prosthesis.

Solid free form fabrication techniques such as fused deposition modeling and three-dimensional printing are used to create a dental restoration. Three-dimensional printing comprises inkjet printing a binder into selected areas of sequentially deposited layers of powder. Each layer is created by spreading a thin layer of powder over the surface of a powder bed. Instructions for each layer may be derived directly from a CAD representation of the restoration. The area to be printed is obtained by computing the area of intersection between the desired plane and the CAD representation of the object. All the layers required for an aesthetically sound restoration can be deposited concurrently slice after slice and sintered/cured simultaneously. The amount of green body oversize is equivalent to the amount of shrinkage which occurs during sintering or curing. While the layers become hardened or at least partially hardened as each of the layers is laid down, once the desired final shaped configuration is achieved and the layering process is complete, in some applications it may be desirable that the form and its contents be heated or cured at a suitably selected temperature to further promote binding of the powder particles.

The present invention provides a method for preparing dental restorations, the method comprising the steps of (a) compiling a database of materials for use in preparing a dental restoration; (b) compiling a database of procedures for preparing the dental restoration; (c) determining the geometrical constraints of the dental restoration; (d) determining the aesthetic constraints of the dental restoration; and (e) inputting the geometrical constraints and the aesthetic constraints to a computer to mathematically select from the material database and the procedure database a recipe for producing the dental restoration.

A dental prosthesis for periodontal integration is disclosed. Furthermore a customized dental prosthesis for osseointegration is disclosed having a first manufactured portion shaped to substantially conform to the three-dimensional surface of a root of a tooth to be replaced and a second manufactured portion shaped to substantially conform to the three-dimensional surface of a crown of a tooth to be replaced. Furthermore a customized manufactured splint is disclosed to position and fixate a tooth-shaped prosthesis. Furthermore a CAD/CAM based method of and a system for manufacturing a customized dental prosthesis replacing an extracted tooth is disclosed, where the extracted tooth is scanned regarding its three-dimensional shape and substantially copied using (a) an imaging system in-vitro like a 3D scanner or in-vivo like a cone beam CT system, (b) CNC machinery and (c) biocompatible material that is suitable to be integrated into the extraction socket and at least partially adopted by the existing tissue forming the socket.

A support for sustaining and/or forming a dental prosthesis, comprises an axle, an anchoring part which can be anchored in a bone or a master model, and a head part which protrudes out of said bone or master mode. The head part has intermediate spaces distributed around the axis, i.e., several first intermediate spaces forming a divided circle, and a second, wider and/or deeper intermediate space. A cap can be fixed to the support. The cap has at least one projecting part for engaging in an intermediate space and, optionally, can be configured for fixing in several different rotational positions or a single rotational position, the support allowing exact positioning. The cap can also be produced without a projecting part of the type mentioned. The same support can be used to form different types of dental prostheses.

A sub-periosteally implantable prosthesis support structure for a fixed or detachable dental prosthesis includes a framework fitted to and generally conforming to the inner and outer contours of the bony ridge structures of a person. The framework is configured to provide a space extending generally normal to the bony ridge structure to an apex to provide space for subsequent bone growth. A plurality of denture support posts are distributed about the framework and depend outwardly from the apex in substantial alignment with the bony ridge structure. During the fabrication of the prosthesis support structure, a bio-compatible fine mesh screen is fixed to and spans, tent-like, the framework to substantially overlay the bone structure and the space provided for subsequent bone growth. After the support structure has been implanted, the growth of bone into the space and around the support structure is promoted to osseo-integrate the support structure with the person's bony ridge, thus providing a secure foundation for a denture or fixed dental prosthesis configured for detachable or fixed coupling with the denture support posts. The support structure may be made, partly or wholly, from either non-resorbable material, such as titanium stock and mesh, or from a resorbable material such as Vicryl TM .

A dental implant abutment for attaching a dental prosthesis within a patient's mouth. The abutment is a single unit structure fabricated of a ceramic material, multicolored throughout to match the color of the dental prosthesis, the surrounding dentition and the surrounding gingival tissue.

Tools are described for preparing digital dental models for use in dental restoration production processes, along with associated systems and methods. Dental modeling is improved by supplementing views of three-dimensional models with still images of the modeled subject matter. Video data acquired during a scan of the model provides a source of still images that can be displayed alongside a rendered three-dimensional model, and the two views (model and still image) may be synchronized to provide a common perspective of the model's subject matter. This approach provides useful visual information for disambiguating surface features of the model during processing steps such as marking a margin of a prepared tooth surface for a restoration. Interactive modeling tools may be similarly enhanced. For example, tools for margin marking may synchronize display of margin lines between the still image and the model so that a user can interact with either or both of the visual representations, with changes to a margin reflected in both displays.

Optical characteristic measuring systems and methods such as for determining the color or other optical characteristics of teeth are disclosed. Perimeter receiver fiber optics preferably are spaced apart from a source fiber optic and receive light from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the optical characteristics measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence, gloss and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention. A method of producing dental prostheses based on measured data also is disclosed. Measured data also may be stored and/or organized as part of a patient data base. Such methods and implements may be desirably utilized for purposes of detecting and preventing counterfeiting or the like. Low cost and small form factor spectrometers, and methods for manufacturing the same, also are disclosed. Spectrometers and spectrophotometers embedded in printing and scanning and other type devices, as well as computer companion devices, scope-type devices and the like, also are disclosed. Data encoding based on such devices also may be implemented.

A method and device for detecting the contour data and/or optical characteristics of an object, such as a tooth or a tooth restoration, based on an interference and/or autocorrelation measurement using an image sensor. To permit an exact surface detection in addition to a determination of the optical characteristics of the object, individual light beams strike the object, which are located at a distance from one another in such a way that no impact of reflected individual light beams takes place on immediately adjacent pixels of the image sensor.

Systems, methods, and/or computer-readable media described herein provide technical solutions to the highly technical problems of machine generation of dental restorations. In particular, these systems, methods and/or computer readable media may provide technical solutions to aid in the creation of dental restorations that more closely resemble a natural tooth (including its internal optical structure). These systems, methods and/or computer readable media may help in virtually rendering a tooth, including its internal optical structure, and apply these renderings (e.g., digital models) to the fabrication of the dental restoration.

The invention relates to a method by which a mold for casting, such as metal casting, of dental prostheses is prepared, with the step of: preparing the mold on the basis of mold model data with a CAM/CAD method. Furthermore, the invention relates to a method for the determination of a shape of a mold for casting, such as metal casting, of dental prostheses with the step of: creating mold model data describing the shape of the mold.

A dental block for producing a dental prosthesis comprises a green body including zirconia and having a chemical composition including increasing amounts of yttria through a thickness of the green body. The green body is substantially white with a substantially consistent optical characteristic of chroma across the thickness, and is subsequently millable and sinterable to form the dental prosthesis with an optical characteristic of decreasing chroma through a thickness of the dental prosthesis.

A method and system for fabricating a dental prosthesis are provided. High resolution digital scanned images of a patient's oral structures are acquired. Three dimensional (3D) cone beam X-ray images of hard and soft oral tissues are acquired. The scanned images are integrated with the 3D cone beam X-ray images in a 3D space to obtain combined three dimensional images of the oral structures. The occlusal relationship between upper and lower oral structures are digitally simulated using the combined three dimensional images. The dental prosthesis is digitally modeled for planning intra-oral positioning and structure of the dental prosthesis. The digital dental prosthesis model is refined based on simulated force tests performed for assessing interference and retention of the digital dental prosthesis model. A prospective dental prosthesis model is created based on the refined digital dental prosthesis model. The dental prosthesis is fabricated based on a verified prospective dental prosthesis model.

A surgical drill guide for installing dental implants with predetermined angular alignment and rotational orientation for a dental prosthesis, formed of:

• • a. a base part formed to correspond generally to the shape and contour of a patient's upper or lower mouth, the base part having peripheral edges and having opposite tissue and mouth sides and at least one drill guide hole extending through the base part from the tissue side to the mouth side, each of the drill guide holes having a central axis at a predetermined angular orientation relative to the mouth side and having lateral location relative to the peripheral edges, and
  • b. a set of rotational position indicators on the tissue and mouth sides respectively of the base part for each of the drill guide holes, the rotational position indicators of each set being at the same rotational position about the central axis of the drill guide hole.

A dental implant assembly for supporting a dental prosthesis. The assembly comprises a dental implant and an abutment. The dental implant comprises a body portion, a collar portion and a central bore. The body portion is located at a distal end of the dental implant and is configured to lie at least substantially below a crest of a patient's jawbone. The collar portion is located at a proximal end of the dental implant and forms an abutment mating surface which defines an outer edge that has a generally scalloped shape. The central bore extends through the collar portion and into the implant body portion. The central bore includes a threaded portion and a post portion. The abutment comprises a post configured to fit within the post portion of the central bore and an implant mating surface that is configured to mate with the abutment mating surface of the dental implant.

The invention relates to a method for producing a dental prosthesis element (7), according to which the dental prosthesis element (7) is manually reworked. Construction data (17, 17′, 17″) relating to the dental prosthesis element to be produced is recorded together with measurement data (7′) relating to the dental prosthesis element (7) to be produced and is reproduced on a display (4), the measurement data having been recorded by means of a three-dimensional measurement device (2). The invention also relates to one such method whereby a 3D data record of the tooth situation (14) is reproduced on the display (4) instead of the construction data. The invention further relates to a device for the partial manual treatment of the dental prosthesis element. Said device comprises a three-dimensional measurement device (2), a display (4), and a computer unit (3) comprising means for the correlation and comparison of two data records and for graphically presenting the data generated by the comparison.

In one aspect, a group of inter-connecting, prefabricated components of various shapes and sizes that can be assembled together to form a framework system directly onto dental implants installed in the patient's mouth is disclosed. In another aspect, a group of prefabricated components to form a drill guide system for drilling a properly spaced and oriented implant hole adjacent to another implant hole or adjacent to a fully-installed implant is disclosed. In yet another aspect, improved procedures for installing permanent, implant-supported dental restorations are disclosed, including an immediate loading procedure.

Systems and methods for a dental implant system suitable for an endosteal implant into a jawbone are provided. The systems and methods make use of an tapered, expandable polymer sheath insertable into a jawbone, a tapered implant insertable into the sheath and causing expansion of the sheath upon insertion, and an abutment adapted to be coupled to the implant and permitting the attachment of a dental prosthesis.