3970 results about "Tooth surface" patented technology

An arrangement that may be used in combination with selected tools having a tooth cutting surface for the care and maintenance such as removing a selected portion of the exposed surface of equine teeth. The selected tool in communication with a source of powered motion and mounted in and supported by a hand piece which is guided into the mouth of the horse. The cutting surface of the powered tool is partially guarded so as to protect fleshy portions of the horse's mouth from being engaged by the cutting surface. The hand piece provides for quick on and off attachment of a selected cutting surface for maintenance of a preselected portion of teeth within the same hand piece or another hand piece sized to ease access to the next selected portion of the horse's mouth. The selected hand piece arrangement may further incorporate a vacuum channel whereby the tooth dust and debris created by the powered cutting surface removing a portion of tooth is sucked out of the mouth of the horse. The motion of the tooth surface removal tool may be changed from rotary to powered reciprocating motion for a selected portion of the teeth or changed to be at a preselected angle. Attaching the powered drive to the rotary cutting surface by means of an adjustable clutch further enhances protection from injury to the inside of the mouth of the horse.

Polymeric shell appliances are provided in which the polymeric shell appliances are configured to provide one or more activation forces to facilitate tooth movement. In many embodiments, the appliances comprise interproximal engagement structures to provide activation forces to interproximal tooth surfaces. In many embodiments, the activation forces are arranged to provide a plurality of forces, including a force in a direction opposite to an intended direction of tooth movement. The polymeric shell appliances may comprise one or more tooth receiving cavities, in which each of the plurality of tooth receiving cavities is shaped and arranged to provide a counter moment of each of the plurality of teeth.

Methods for recognizing a virtual tooth surface, defining a virtual tooth coordinate system, and simulating a collision between virtual teeth are provided. Methods include receiving input data specifying a point on the rendered surface model associated with a tooth, deriving a perimeter on the surface model of the tooth, and analyzing the surface model along a plurality of paths outwardly extending from points on the perimeter. Methods also include receiving point input data, receiving axis input data that defines first and second axes associated with the virtual tooth, computing a substantially normal vector for a portion of the tooth surface surrounding the point, and computing a coordinate system. Methods also include receiving permissible movement input data directed to permissible movement of a first virtual tooth, bringing the first virtual tooth into contact with a second virtual tooth, and displaying data resulting from the simulation.

A thin, flexible film which when applied to stained teeth is hydrated by saliva and is effective in such form to whiten teeth, the film comprising an anhydrous water hydratable ethylene oxide polymer matrix containing a solid peroxide whitening agent whereby upon application to stained tooth surfaces, the peroxide whitening agent is solublilized by saliva present in the oral cavity into active whitening activity when the film is positioned and placed on the teeth.

Early dental caries detection is carried out by a method that combines optical coherence tomography (OCT) and Raman spectroscopy to provide morphological information and biochemical specificity for detecting and characterizing incipient carious lesions found in extracted human teeth. OCT imaging of tooth samples demonstrated increased light back-scattering intensity at sites of carious lesions as compared to the sound enamel. Raman microspectroscopy and fibre-optic based Raman spectroscopy are used to characterize the caries further by detecting demineralization-induced alterations of enamel crystallite morphology and / or orientation. OCT imaging is useful for screening carious sites and determining lesion depth, with Raman spectroscopy providing biochemical confirmation of caries. The combination is incorporated into a common probe operable without movement to scan the tooth surface and to provide an output for the dentist.

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.

The present invention provides an improved self-ligating orthodontic bracket. According to one embodiment, the improved orthodontic bracket includes a mounting base for attachment to a tooth surface, an archwire slot formed upon the base and sized for receiving an orthodontic archwire, a channel formed upon the base and transversely oriented to the archwire slot, and a ligating slide member slideably retained within the channel and closeable over the archwire slot for retaining the orthodontic archwire therein, and wherein the ligating slide member includes at least one coplanar resilient retention mechanism for exerting retention forces coplanar with the ligating slide member for holding the ligating slide member in a closed position. In one embodiment, the improved orthodontic bracket comprises a bracket with a ligating slide member slideably retained within a dovetail shaped channel.

PCT No. PCT / CN97 / 00004 Sec. 371 Date Sep. 17, 1998 Sec. 102(e) Date Sep. 17, 1998 PCT Filed Jan. 20, 1997 PCT Pub. No. WO97 / 25968 PCT Pub. Date Jul. 24, 1997The invention relates to a tooth-whitening varnish composition, comprising 6-20% of carbamide peroxide, 2-9% of film forming agent and 77-88% of volatile organic solvent, based on the total weight of the composition. The volatile organic solvent is selected from ether, ethylacetate, ethyl alcohol, or acetone. The film forming agent is artificial or natural material selected from cellulose, polyvinyl, butyral, coumarone resin or shellac. The composition can rapidly form films on dry tooth surfaces, and a remarkable tooth-whitening effect can be obtained.

This invention provides an adjustable orthodontic bracket. The adjustable orthodontic bracket includes an orthodontic arch wire slot / tube and fixing part, an adjustable part, and a tooth surface fixing part. The orthodontic arch wire slot and fixing part is used to fix one or several orthodontic arch wire(s). The adjustable part is fixed under the orthodontic arch wire slot / tube and fixing part and provides a structure allowing the orthodontic arch wire slot / tube and fixing part to be turned around and fixed, and thereby the orthodontic arch wire slot / tube and fixing part is able to generate a stress to teeth for orthodontic treatment through turning itself around to pull and drag the orthodontic arch wire(s). The tooth surface fixing part is used to fix the adjustable part on tooth surface.

A set of orthodontic appliances is releasably connected to wall portions of a bonding tray that is used in an indirect bonding procedure. A quantity of dental sealant is applied to wall portions of the tray, and is subsequently transferred to enamel surfaces of the patient s teeth when the bonding tray is placed in position over one of the patient s dental arches. The dental sealant tends to reduce the formation of plaque in regions of the patient s tooth surfaces adjacent the orthodontic appliances.

An intra-oral imaging apparatus having an illumination field generator that forms an illumination beam having a contour fringe projection pattern when receiving light from a first light source and having a substantially uniform illumination field when receiving light from a second light source. A polarizer in the path of the illumination beam has a first polarization transmission axis. A projection lens directs the polarized illumination beam toward a tooth surface and an imaging lens directs at least a portion of the light from the tooth surface along a detection path. A polarization-selective element disposed along the detection path has a second polarization transmission axis. At least one detector obtains image data from the light provided through the polarization-selective element. A control logic processor responds to programmed instructions for alternately energizing the first and second light sources in a sequence and obtaining both contour fringe projection data and color image data.

An electrically-driven toothbrush has a brush holder that is arranged to rotationally vibrate and carry a number of bristles interspaced with arcuate membranes. The membranes serve to aid cleaning of the teeth and to polish the teeth surfaces during use of the toothbrush.

A method for caries detection uses an image capture device (30, 32) to obtain fluorescence image data from the tooth (20) by illuminating the tooth to excite fluorescent emission. A first enhanced image of the tooth is then obtained by illuminating the tooth at a first incident angle, obtaining a back-scattered reflectance image data from the tooth tissue, and combining the back-scattered reflectance image data with the fluorescence image data. A second enhanced image of the tooth is then obtained by illuminating the tooth at a second incident angle, obtaining a back-scattered reflectance image data from the tooth tissue, and combining the back-scattered reflectance image data with the fluorescence image data. The first and second enhanced images are then analyzed to select and display the best-contrast image. This method provides high contrast images for carious regions (58) on all tooth surfaces.

A self-locking orthodontic bracket comprises a body (1) and a base (2) contoured to fit a tooth surface. The body (1) has an arch wire slot (3) extending horizontally across the labial / buccal surface, a pair of tie wings (4A and 4B) projecting vertically on either side of the arch wire slot (3), a retainer member (6) having a transverse part and two perpendicular horizontal extensions at the end (6A and 6B) attached to the sides of one of the tie wings (4A) and a slidable cover (5) retained and guided in the recess created between the retainer member (6) and the surface of the tie wing (4A). The slidable cover (5) can be moved vertically towards the tip of the tie wing (4A) to open the arch wire slot (3) and it can be moved in the opposite direction to close the arch wire slot (3).Different embodiments of the slidable cover (5) and the retainer member (6) are disclosed herein.

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.

The invention relates to a method for planning a bracket system (1) for the correction of malpositions of teeth (2), comprising a plurality of brackets (3) and an arch (4) wherein at least one platelet (6) per tooth is mounted on certain tooth surfaces (5) of the teeth to be corrected (2), a three-dimensional optical image (50) of the tooth region to be treated is created, the platelets (6) have registration elements (10) comprising registration points (11) and the registration points (11) have a characteristic form for registration in the three-dimensional optical image (50)

A dental article is fabricated from an SMC material using three-dimensional data captured from natural dentition to guide a computer-controlled milling machine. The three-dimensional data may include scans of an original tooth structure and a prepared tooth surface to characterize all surfaces of a dental article, or certain features may be created within a computer-assisted design environment taking account of occlusion, proximal contacts, and the like. In addition the model applied to a computer-controlled milling machine may account for shrinkage of the SMC material during any post-milling curing steps in order to ensure an accurate fit to the prepared tooth surface.

A method, system and device for positioning and fixing an orthodontic element on a surface of a tooth are provided. The positioning of the element on a tooth is accomplished by: bringing the element into proximity of the tooth while continuously capturing an image of at least the tooth or of the element, and an image of both, once the tooth and the element are proximal to one another; transmitting the image or its representation to a display for displaying a real-life image of the captured image or representation together with indicators providing guidance information on intended position of the orthodontic element on the tooth's surface; positioning the element on a tooth's surface according to said indicators such that the element's position coincides with the intended position; and fixing the element onto the tooth.

An intra-oral imaging apparatus having a fringe pattern generator energizable to emit a fringe pattern illumination having a predetermined spatial frequency, with light in the approximate 350-500 nm range. A polarizer in the path of the fringe pattern illumination has a first polarization transmission axis. A projection lens is disposed to direct the polarized fringe pattern illumination as incident illumination toward a tooth surface. An imaging lens is disposed to direct light reflected and scattered at the tooth surface along a detection path. An analyzer is disposed along the detection path, having a second polarization transmission axis. A detector disposed along the detection path obtains image data from the light provided through the analyzer. A control logic processor is responsive to programmed instructions and actuable to adjust the intensity over one or more portions of the fringe pattern illumination according to the image data obtained from the detector.

A method of making precipitated silica abrasive compositions having excellent cleaning performance and lower abrasiveness with post-reactor sizing of the abrasive particles being performed via air classification techniques is provided. By targeting a specific particle size range, it has been determined that higher pellicle film cleaning levels may be achieved without also increasing the dentin abrasion properties of the silica products themselves. As a result, dentifrices including such classified abrasive silica products, and exhibiting particularly desirable cleaning benefits, can be provided for improved tooth polishing, whitening, and the like, without deleteriously affecting the hard tooth surfaces. Also encompassed within this invention also are products of this selective process scheme and dentifrices containing such classified silica products.

Disclosed is a method for designing tooth surfaces of a digital dental prosthetic item existing as a 3D data set using a first 3D model of a preparation site and / or of a dental prosthetic item and a second 3D model, which second model comprises regions which match some regions on the first 3D model and regions which differ from other regions of the first 3D model, the non-matching regions containing some of the surface information required for the dental prosthetic item, wherein at least three pairs (P1, P2, P3) of points (P11, P12; P21, P22; P31, P32) corresponding to each other are selected on the matching region on the first 3D model (A) and the second 3D model (A′), that the positional correlation of the second 3D model with reference to the first 3D model is determined with reference to the at least three pairs (P1, P2, P3), and that portions of the non-matching regions of the first and second 3D models are implemented for designing the tooth surface of the dental prosthetic item taking into consideration the positional correlation of these models relative to each other.

The invention is a locally mounted light source for light activation of tooth whitening compositions. A support in the form of a bridge attached to a retractor or as part of a mouth guard has integral therewith, a small and lightweight light source, such as could be provided by one or more high-intensity LED's, though other light sources could be used. The light source may be in the form of an array, powered by either a direct electrical connection to a power supply or by battery power, for example, with a battery pack worn by the user. The light source is thus located in proximity to the tooth surfaces regardless of head movement or orientation, increasing user mobility and comfort.

The invention provides a single phase whitening dentifrice that includes (i) a whitening agent selected from the group consisting of hydrogen peroxide, a bound peroxide and a solid peroxide (ii) an abrasive and (iii) a substantially anhydrous orally acceptable carrier, for example, polyethylene glycol. The bound peroxide may be hydrogen peroxide and a polymer and / or any peroxide compound and a porous cross-linked polymer, such as polymers of polyvinyl pyrrolidone, polyacrylates, a polymethacrylates, and a polyitaconates. The solid peroxide may be sodium perborate or urea peroxide. The invention also provides methods of whitening the tooth surfaces by contacting the surface with the composition.

Methods for recognizing a virtual tooth surface, defining a virtual tooth coordinate system, and simulating a collision between virtual teeth are provided. Methods include receiving input data specifying a point on the rendered surface model associated with a tooth, deriving a perimeter on the surface model of the tooth, and analyzing the surface model along a plurality of paths outwardly extending from points on the perimeter. Methods also include receiving point input data, receiving axis input data that defines first and second axes associated with the virtual tooth, computing a substantially normal vector for a portion of the tooth surface surrounding the point, and computing a coordinate system. Methods also include receiving permissible movement input data directed to permissible movement of a first virtual tooth, bringing the first virtual tooth into contact with a second virtual tooth, and displaying data resulting from the simulation.

An orthodontic bracket system includes a bracket having a base contoured to engage a tooth surface, a body extending from the base, at least one first tie wing connected to the body, and a pair of second tie wings connected to the body and spaced from the first tie wing in an occlusal-gingival direction when the bracket is mounted on a tooth. An archwire slot extends between the first and second tie wings in a mesial-distal direction, wherein the first tie wing has an outwardly inclined rear surface proximate the archwire slot. A clip for use with the bracket has a retaining portion configured to fit beneath the first tie wing on the side thereof opposite the archwire slot, a locking edge portion remote from the retaining portion that fits into a recess beneath the second tie wings, a mid-portion that spans the retaining portion and the locking edge portion and covers at least a portion of the archwire slot in a manner effective to retain an archwire therein, and at least one arm that extends from the locking edge portion towards the retaining portion and is spaced from the mid-portion. During closing, the arm rides down against the inclined rear surface of the first tie wing and a portion of the clip bends resiliently, exerting a force that locks the locking edge portion of the clip in the recess beneath the second tie wings. During opening, the arm rides up against the inclined rear surface of the first tie wing as the locking edge portion of the clip is removed from the recess beneath the second tie wings. The clip is then moved to an open position to permit placement and removal of the archwire and held in that position.

A stable, nonaqueous liquid tooth whitening composition comprised of an anhydrous peroxide compound dispersed in an orally acceptable hydrophobic organic material such as a silicone based pressure sensitive polymer which composition when applied topically to tooth surfaces forms an adherent layer containing the peroxide compound which peroxide compound is thereafter is released from the layer to effect tooth whitening.