790 results about "Tooth crown" patented technology

Controlled-specimen-sampling oral devices are described, implanted or inserted into an oral cavity, built onto a prosthetic tooth crown, a denture plate, braces, a dental implant, or the like. The devices are replaced as needed. The controlled specimen sampling may be passive, based on a dosage form, or electro-mechanically controlled, for a high-precision, intelligent, specimen sampling. Additionally, the controlled sampling may be any one of the following: sampling in accordance with a preprogrammed regimen, sampling at a controlled rate, delayed sampling, pulsatile sampling, chronotherapeutic sampling, closed-loop sampling, responsive to a sensor's input, sampling on demand from a personal extracorporeal system, sampling regimen specified by a personal extracorporeal system, sampling on demand from a monitoring center, via a personal extracorporeal system, and sampling regimen specified by a monitoring center, via a personal extracorporeal system. Specimen collection in the oral cavity may be assisted or induced by a transport mechanism, such as any one of, or a combination of iontophoresis, electroosmosis, electrophoresis, electroporation, sonophoresis, and ablation. The oral devices require replacement at relatively long intervals of weeks or months. The oral devices and methods for controlled specimen sampling apply to humans and animals.

A biofunctional dental implant wherein a crown portion is connected to a root portion without the use of the conventional short screws, or the like. A flexible abutment projects upwardly from the root portion, and the crown portion is positioned in surrounding engagement with the flexible abutment. A threaded abutment post is advanced through the flexible abutment and into receipt by the root portion. The advancement of the abutment post through the flexible abutment generates an outward pushing force for causing a plurality of flexible splines of the abutment to bend outwardly and into engagement with an elastomeric cap of the crown portion for holding the crown portion atop the root portion. In one preferred embodiment, a replacement crown portion is detachably connected to an existing root portion by way of a removable abutment screw so as to enable a broken or worn crown portion to be removed and replaced without the need for a new surgery.

A system and method for modeling of complete tooth, including root and crown, of a patient to facilitate orthodontic treatment are provided, wherein a generic tooth modeling is combined with a tooth crown modeling for a patient to yield a complete tooth modeling. In accordance with an exemplary embodiment, a generic tooth three-dimensional model for a particular tooth is morphed with a three-dimensional model of a patient's crown for the corresponding tooth to yield a complete three-dimensional model for that tooth. Such modeling techniques can be conducted with one or more computer-based systems, such as systems configured for storing patient data and generic tooth data, morphing such data and/or facilitating additional orthodontic treatment applications, through the use of one or more algorithms. Further adjustment of the complete tooth model for the tooth can also be provided through additional patient information, such as X-ray imaging, to address variations in root shape between a generic root and an actual root shape for a patient.

A method, apparatus, and article of manufacture is disclosed for providing a dental crowns using electronic models, and more particularly to a method, apparatus, and article of manufacture for creating dental crowns using a lost-wax manufacturing process from electronic model files corresponding to patient teeth impressions and corresponding electronic models for tooth crowns. The system and method permit the electronic generation and specification of crown, bridge, and implant dental appliances that may be specified in an industry standard file specification. This specification is utilized in a rapid prototyping process to generate a wax impression for the appliance that may then be fabricated using standard lost-wax fabrication techniques.

Dental crown forms and methods of using them are disclosed. The dental crown forms may include one or more of the following features: a handle attached to the dental crown form at a location removed from the base of the dental crown form; a vented handle through which excess amounts of hardenable dental material can pass during placement of the crown form; and one or more lines of weakness that may be separated to remove a dental crown form from hardenable dental material after placement of the filled crown form. The dental crown forms may also be located in packages with hardenable dental material located within the dental crown forms as packaged.

A self-ligating orthodontic bracket assembly with selectively removable self-ligation features is configured to provide a low profile to minimize labial-lingual prominence. A clip is configured to snap into the base of the bracket and close over the archwire slot to retain the archwire in the slot. The clip is easily moved to an open position when the archwire is changed out during routine treatment. The clip includes spaced apart arms that, along with the bracket tie-wings, straddle the most outwardly prominent site on the crown of the tooth thereby minimizing labial-lingual profile. The self-ligation capability is achieved without any increase in occlusal-gingival height or measial-distal width of the orthodontic bracket.

A self-ligating orthodontic bracket assembly with selectively removable self-ligation features is configured to provide a low profile to minimize labial-lingual prominence. A clip is configured to snap into the base of the bracket and close over the archwire slot to retain the archwire in the slot. The clip is easily moved to an open position when the archwire is changed out during routine treatment. The clip includes spaced apart arms that, along with the bracket tie-wings, straddle the most outwardly prominent site on the crown of the tooth thereby minimizing labial-lingual profile. The self-ligation capability is achieved without any increase in occlusal-gingival height or measial-distal width of the orthodontic bracket.

A dental implant includes a fixture and an abutment in a body, and a head for a compaction drill is configured for implanting such an implant. The implant includes an upper abutment portion on which a denture is fixed, a fixture portion implanted in the jawbone and forming single or double threads, and a settling portion formed between the abutment portion and the fixture portion. The invention improves the stability of the implant, improves stabilization of the bone tissue affixed to the implant, effectively seals the socket from its surroundings and facilitates bonding between implant and jawbone. This is achieved because of the early healing of tissue around the implant and the greater surface area in contact with surrounding tissue. As a result, an artificial crown may be coupled with the implant during the same surgery.

A dental implant includes a spiral thread for threaded engagement with a passageway formed in bone or tooth to mechanically secure the implant. A hollow stem extends upwardly to provide a passageway to a plurality of outlets at the lower end to fill a mold from the bottom up to develop an abutment ultimately supporting a crown, bridgework, or other prosthetic. The stem includes an end for engagement by a conventional dental hand piece to rotatably insert the implant. The base of the stem may include a hexagonal nut or a double disc for engagement by a dental ratchet for final seating of the implant. The post of the implant may include one or more longitudinally aligned tips that can be cut off to conform the length of the post with the depth of bone or tooth into which it will become inserted. The stem may include one or more longitudinally aligned segments that may be severed to conform the length of the stem with the height of the crown, bridgework or prosthetic. In a variant implant, the post includes a further passageway extending from the passageway in the stem to permit injection of bonding material into the further passageway for discharge through outlets of the further passageway into annular grooves formed in the one about the cavity into which the post is inserted.

A dental implant apparatus consisting of an auger-like lower threaded portion that is screwed into the bone. It includes a divergent intermediate collar with mini-threads for engaging the cortical bone, and a tapered abutment for fixed tooth replacement or a ball-like snap attachment to secure removable dentures. The apical end of the device has a tapered portion with a blunt tip that condenses the medullar bone, which in combination with the divergent collar engaging and wedging into the cortical bone, provides a dual stabilization structure that can be immediately loaded or placed in light function by cementing on a temporary crown or bridge or by lightly attaching a removable full or partial denture.

A truncated conical dental drill bit is disclosed to facilitate the preparation of a tooth prior to installation of a dental crown. The drill bit includes a stem connected to an upper disc which, in turn, is connected to a downwardly extending sidewall having a conical configuration. The sidewall terminates at a lower edge and undersurfaces of the sidewall and upper disc are coated with abrasive material, such as diamond particles. The size of the drill bit is chosen for the particular tooth in need of repair and a single downward drilling operation is required to form a truncated conical configuration or crown receiving surface on the tooth. A measurement gauge is disclosed for measuring the tooth in need of repair and selecting the appropriate size truncated conical dental drill bit. A gingival cord application tool is also disclosed which facilitates the separation of the gingiva from the tooth prior to the taking of the impression of the prepared tooth for purposes of crown fabrication

A system and computer-implemented method including generating a patient digital tooth model including a crown component; generating landmarks on an edge of the crown component; and generating a generic digital tooth model corresponding to the patient digital tooth model. The generic digital tooth model including both root and crown components. The method also includes mapping the landmarks on the edge of the crown component on to the generic digital tooth model; solving a first morphing function to fix landmarks on an edge of the crown component to a ring-edge space; solving a second morphing function to fix landmarks on the generic digital tooth model to ring-edge space; and selecting vertices in ring-edge space to stitch tooth crown with morphed template root.

The invention relates to an automatic machine tool, for the production of base structures, for false teeth, in particular, for tooth crowns and/or tooth bridges of exact three-dimensional shape. Said base structures may be fixed to prepared natural and/or artificial tooth stumps. The machine tool comprises a machine frame, or a body, a work piece carrier, with a rotation shaft, at least one digitization unit, at least one machining unit and an electronic arithmetic and control unit for all drive lines. A carrier for the workpiece, a blank, and/or for the machining unit(s), serves as displacement unit, with three translational axes in the x-, y- and z-directions. The digitization of the preparation model and the machining of the blank are carried out on the same machine tool, at different times. The machining paths for the blank are calculated from the measured and stored digitized data and a predetermined material-specific scaling factor, before the machining of the blank.

System and methods for positioning 3D virtual brackets on teeth for the precise positioning of conventional brackets and wire. Various reference features may be calculated for the teeth and used to calculate a position for the virtual bracket. Reference features that are calculated include curve of Spee, Andrew's plane, and a facial axis of the clinical crown for the teeth.