Abstract: A removable orthodontic correction device includes a first correction unit, a second correction unit, and several elastic members. The first correction unit is configured to be removably worn on the anterior teeth of the maxillary or mandibular dental arch of a patient and has several first connection parts formed thereon. The second correction unit is configured to be removably worn on the posterior teeth of the same maxillary or mandibular dental arch of the patient and has several second connection parts formed thereon. The elastic members couple the first connection parts to the second connection parts. Thus, the elastic force of the elastic members drives the first correction unit to retract toward the second correction unit, to achieve en masse retraction and intrusion of the anterior teeth during space closure in the treatment of dental protrusion.

Abstract: A method and processor for generating a 3D-platform representation of a tooth-specific platform for attachment of a dental appliance to a tooth of a patient are disclosed. The method includes acquiring a 3D-tooth representation of the tooth, and defining an attachment zone on the surface of the 3D-tooth representation. The attachment zone has a zone perimeter enclosing a surface portion of the 3D-tooth representation corresponding to a surface portion of the tooth to which the tooth-specific platform is to be attached. The method also includes generating the 3D-platform representation having (i) a tooth-oriented surface matching the surface portion of the 3D-tooth representation and having a perimeter matching the zone perimeter, (ii) a perimeter wall extending between the tooth-oriented surface and the tooth-opposite surface and away from the surface portion, and (iii) a tooth-opposite surface matching an expanded surface portion of the 3D-tooth representation.

Abstract: A method for reconstructing joined part surfaces of two adjacent teeth of a 3D digital model of teeth is provided. The method includes: obtaining a 3D digital model of teeth which includes adjacent first tooth and second tooth having joined surfaces; identifying a set of intersection points of the joined surfaces; fitting a first plane using the set of intersection points; identifying a set of first control points from points on the 3D digital model of teeth near the set of intersection points basis curvature, where the set of first control points defines boundary of a first part surface of the first tooth to be reconstructed; reconstructing the first part surface using a linear equation system constructed basis the first plane and the set of first control points.

Abstract: A 3D virtual model of an intra oral cavity in which at least a part of a finish line of a preparation is obscured is manipulated in virtual space by means of a computer or the like to create, recreate or reconstruct finish line data and other geometrical corresponding to the obscured part. Trimmed virtual models, and trimmed physical models, can then be created utilizing data thus created. The virtual models and/or the physical models may be used in the design and manufacture of copings or of prostheses.

Abstract: Methods of determining an orthodontic treatment comprising: obtaining 3D model of simulated position of teeth following proposed orthodontic treatment; the 3D model comprising a point cloud representation having vector points representative of teeth surface; generating an axis aligned boundary box around each tooth; identifying a pair of tooth-tooth bounding boxes of adjacent teeth that intersect; defining an area of overlap of the pair of tooth-tooth bounding boxes; mapping the area of overlap onto the plurality of vector points, the plurality of vector points populating a 3D grid, having cells, of a simulation space; identifying a subset of the cells including the mapped overlap area, and for only the subset of the cells determining a distance between the vector points relating to adjacent teeth; and determining the proposed orthodontic treatment as the determined orthodontic treatment if the determined distance is more than a predetermined distance.

Abstract: Disclosed in a method, a user interface and a system for use in determining shade of a patient's tooth, wherein a digital 3D representation including shape data and texture data for the tooth is obtained. A tooth shade value for at least one point on the tooth is determined based on the texture data of the corresponding point of the digital 3D representation and on known texture values of one or more reference tooth shade values.

Abstract: In an embodiment, an input indicating a location selected by a health care professional on an image rendered with respect to a viewport mapped onto an immersive photographic model of a patient's mouth to indicate a position to place an orthodontic bracket on a patient's tooth is received. A ray is extended from a focal point of the viewport at a direction determined based on the input. An intersection of the ray in a three-dimensional space is determined. The intersection indicates a position to place the orthodontic bracket on the patient's tooth.

Abstract: An intraoral scanning system includes a motion sensing unit, an image sensing unit, a storage unit and a processing unit. The processing unit classifies first position information and second position information obtained by the motion sensing unit and the image sensing unit in an initial scanning process into first groups and second groups, wherein the first position information and the second position information are stored in the storage unit. The processing unit selectively uses the first groups or the second groups to perform comparison in a re-scanning process, so as to position an incomplete area in a model.

Abstract: Methods, systems, and apparatus's for improving orthodontic treatments. In an embodiment, an orthodontic tracking template is provided for assisting in determining whether a patient's teeth are in an appropriate tooth arrangement for transitioning between a wire and bracket orthodontic treatment to a patient-removable orthodontic appliance treatment. The tracking template may include a shell portion defining a plurality of tooth-receiving cavities arranged to fit over at least a portion of the patient's teeth in an intermediate tooth arrangement without applying a tooth-moving force to the teeth or to any brackets attached to the teeth.

Abstract: Systems and methods are disclosed for fabricating a dental or oral appliance utilizing support structures. A three dimensional representation of the dentition of a patient may be captured and reconfigured for correcting one or more malocclusions. The oral appliance may be printed upon an inner structure which supports the oral appliance during fabrication. The inner structure may be subsequently removed once the oral appliance is completed.

Abstract: A method of determining an orthodontic treatment comprising: obtaining a 3D model of a simulated position of upper and lower teeth following a simulated orthodontic treatment, the 3D model comprising a point cloud representation comprising a plurality of vector points; in a 3D grid having cells onto which the plurality of the vector points have been mapped, identifying cells containing vectors points representative of the upper teeth and applying a first mask to these cells; identifying cells containing vectors points representative of the lower teeth and applying a second mask to these cells; determining the simulated orthodontic treatment as the determined orthodontic treatment if the 3D grid does not include at least one cell which includes both the first mask and the second mask.

Abstract: An orthodontic appliance including a shell aligner having a portion accommodating movement of a patient's bracketed teeth between a first position and the second position as elicited by force from an orthodontic braces appliance worn by the patient, related systems and methods.

Abstract: A system and method for simultaneously (i) treating a patient's malocclusion by repositioning teeth from an initial tooth arrangement to a final tooth arrangement and (ii) treating Obstructive Sleep Apnea (“OSA”) by forcing the mandible forward comprises a plurality of (e.g., 10-30) sets of individual appliances. The appliances are configured to be placed successively on the patient's upper and lower dental arches and to incrementally reposition the teeth and forcing the jaw forward, during sleep. The system of appliances is preferably configured at the outset of treatment so that the patient may progress through treatment without the need to have the treating professional perform each successive step in the procedure.

Abstract: A dental treatment planning system includes an input form to receive one or more dental patient inputs; and an engine adapted to receive the dental patient data from the input form and validating the dental patient data in a predetermined sequence.

Abstract: A prescription management system is used by an orthodontic or dental lab and a plurality of prescribing users who send prescriptions for customized orthodontic or dental appliances to the lab. The prescriptions are stored in a database selectively accessible by the lab and plurality of prescribing users. A digital workspace is provided in the system in which the lab or prescribing users may create designs for the customized appliances. The designs of the appliances are stored in the database. A tracking record of fabrication of the appliances is stored in the database. A plurality of billings are simultaneously generated in response to the submissions and storage of the prescriptions, the designs of the customized appliances and the fabrication of the designed customized appliances.

Abstract: The present disclosure provides method, computing device readable medium, and devices for dental appliances with repositioning jaw elements. An example of a method can include identifying a misaligned jaw of a patient from a virtual image of the patient's jaw, providing a treatment plan for the patient including a virtual model of a dental appliance having a first shell and a second shell configured to reposition at least one tooth of the patient, and adjusting the position of the repositioning jaw elements on the first shell and the second shell to comply with a number of constraints. The virtual model of the dental appliance including repositioning jaw elements on the first shell and the second shell configured to move a position of the misaligned jaw of the patient.

Abstract: A method including the steps of: providing a plurality of diagnostic programs associated with characteristics of developing dentition of a patient; performing an initial assessment of the patient corresponding to the developing dentition of the patient wherein the initial assessment uses an imaging device to locate points in a mouth of the patient wherein the imaging device generates imaging data; transferring the imaging data to a central processing unit wherein the central processing unit obtains measurements associated with selected points in the mouth of the patient and predicts future orthodontic conditions of the patient based upon the measurements; and providing a report of findings of the initial assessment to the patient with treatment recommendations based upon the findings.

Abstract: The invention relates to a removable lingual-vestibular dental alignment device comprising an assembly of independent caps (12). The inner part of each cover (12) includes a fissure (14) for coupling to a fixing element (21, 24, and 27) adhered to the tooth (20) and outer elements (13) facilitating the passage of the dental arch (16) having a circular, square or rectangular section. The invention also relates to a method for the production of the caps (12) that includes scanning the mold of the denture and working on a virtual mold in order to include the corrective elements. The caps (12, 35) are produced after printing the result of the denture (9) with the different elements and subsequent stamping method or from the printing of a file corresponding to a virtual cap produced on the virtual denture (8) that includes the virtual cuboids (4) and virtual half-spheres (5).

Abstract: Apparatus, system, and methods for utilizing one or more computing devices to stage the movement of teeth during an alignment treatment are disclosed. The computing device receives an electronic representation of the patient's teeth in their initial position and an electronic representation of the teeth a final position for each tooth. A route each tooth will travel to reach its final position is determined, and the teeth are scheduled to move according to a movement pattern. Moreover, the schedule of movement takes into account a maximum rate of tooth movement for each tooth, the path of movement for each tooth, the distance each tooth needs to move, any needed tooth staggering, any needed round-tripping or tooth movement slowing. The invention also includes techniques for determining an optimum number of stages for the treatment based on the schedule of movement.

Abstract: Systems and methods are disclosed to prevent interference between two physical tooth models in a physical dental arch model by acquiring the coordinates of a plurality of points on the surfaces of each of the two physical tooth models and digitally representing the surfaces of each of the two physical tooth models by a mesh of points in three dimensions using the acquired coordinates. The meshes representing the surfaces of the two physical tooth models intersect at least at one point to form an overlapping portion. The method also includes calculating the depth of the overlapping portion between the two meshes to quantify the interference of the two physical tooth models.

Abstract: A system for repositioning teeth comprises a plurality of individual appliances used with braces. The appliances are configured to be placed successively on the patient's teeth and to incrementally reposition the teeth from an initial tooth arrangement, through a plurality of intermediate tooth arrangements, and to a final tooth arrangement. The appliances may be substituted with braces as appropriate to optimize the treatment of the teeth.

Abstract: The current document is directed to methods and systems that provide semi-automated and automated training to technicians who use oral-cavity-imaging-and-modeling systems to accurately and efficiently generate three-dimensional models of patients' teeth and underlying tissues. The training methods and systems are implemented either as subsystems within oral-cavity-imaging-and-modeling systems or as separate system in electronic communication oral-cavity-imaging-and-modeling systems. The training methods and systems use an already generated, digital, three-dimensional model of a portion of the oral cavity of a particular patient or of a physical model of a portion of an oral cavity to compute a temporal, translational, and rotational trajectory of an oral-cavity-imaging-and-modeling endoscope, or wand, during a training scan. The temporal, translational, and rotational trajectory is used for a variety of different types of instruction and instructional feedback to facilitate training of technicians.

Abstract: The present invention relates to an augmented reality system and implementation method for a dental surgery. In the augmented reality system and implementation method for a dental surgery of the present invention, an image convergence step, an interface step and an image projection step are performed. In the image convergence step, a common image obtained by photographing the face of a patient and a transmission image corresponding to the common image are collected, and the common image is mapped to the transmission image in a 3D image in which the common image and the transmission image overlap and registered with a server.

Abstract: The present invention relates to a method for automatically moving an object in a simulation system, and a simulation system using the same. The method for automatically moving an object in a simulation system includes: moving a first object of a plurality of objects in a first direction; measuring a vector distance between the first object and a second object which is an object adjacent to the first object according to the movement of the first object; and automatically vector-moving the second object by a predetermined distance in the first direction along a preset path so that the vector distance is in a preset vector distance range.

Abstract: Detection of placement of dental aligners in patient mouth on teeth for indication of wearing compliance. Described herein are apparatuses and methods for detecting wearing, including compliance, and for reliably transferring data, by wired or wireless direct or indirect communication of electronic compliance information to a smartphone. Also described herein are dental appliances that can detect physiological parameters related to respiration and sleep. Also described herein are aligner cases that enable NFC communication with electronic compliance indicator (ECI) devices and Bluetooth communication with smartphones.

Abstract: An extraoral dental scanner for three-dimensional capture of the surface of a dental shaped part (300) with a 3D measuring camera (102) having an optical axis (106), wherein the means for the machine-controlled relative positioning of the 3D measuring camera (102) and the dental shaped part (300) are embodied in such a way that the means for taking up and positioning the dental shaped part (300) can be moved into a parking position outside a region that can be captured optically by the 3D measuring camera (102), with a work plate (708) for manually positioning the dental shaped part (300) in the measurement volume (144) of the 3D measuring camera (102), wherein the work plate (708) is aligned perpendicularly to the optical axis (106) and wherein the work plate (708), as viewed from the 3D measuring camera (102), is arranged behind the means for taking up and positioning the dental shaped part (300), makes it possible to record uninterrupted 3D image data with very short recording times both by automatic and b

Abstract: Orthodontic systems and related methods are disclosed for designing and providing improved or more effective tooth moving systems for eliciting a desired tooth movement and/or repositioning teeth into a desired arrangement. Methods and orthodontic systems include the generation of an overcorrection in the tooth-receiving cavities of an appliance worn in the dentition. The overcorrection may provide an improved and more accurately applied force or moment applied to a tooth. The overcorrected force or moment can move a tooth closer to a desired position than if not overcorrected as sufficient force can still applied to the tooth as it gets closer to the desired position. The overcorrected force or moment may also better target the root of the tooth where the biological response to tooth movement occurs. The overcorrection may be calculated in various ways as described herein.

Abstract: Apparatus, system, and methods for utilizing one or more computing devices to stage the movement of teeth during an alignment treatment are disclosed. The computing device receives an electronic representation of the patient's teeth in their initial position and an electronic representation of the teeth a final position for each tooth. A route each tooth will travel to reach its final position is determined, and the teeth are scheduled to move according to a movement pattern. Moreover, the schedule of movement takes into account a maximum rate of tooth movement for each tooth, the path of movement for each tooth, the distance each tooth needs to move, any needed tooth staggering, any needed round-tripping or tooth movement slowing. The invention also includes techniques for determining an optimum number of stages for the treatment based on the schedule of movement.

Abstract: The present invention relates to a toothbrush and provides an electric toothbrush comprising a hollow hand-held casing; the hand-held casing is disposed therein with a rechargeable lithium battery via a battery mount, and a brushless motor via a motor mount. The battery mount accommodates a PCT connected with the rechargeable lithium battery. The PCB is disposed with a control switch via a waterproof mount and a waterproof switch case. The press portion of the control switch is exposed from the switch hole of the hand-held casing. The vibration shaft of the brushless motor passes through the motor mount to an exterior of the hand-held casing. The vibration shaft is connected to a toothbrush head. The hand-held casing is threadedly connected to the rear cap at a bottom end thereof. The hand-held casing has a cross section in shape of a circle.

Abstract: A method of using an orthodontic device to effect movement of an impacted or malpositioned tooth includes providing an orthodontic device, the orthodontic device including a bracket, a coiled spring, and an anchoring assembly, bonding the bracket to an impacted or malpositioned tooth, connecting a first end of the spring to a first spring attachment portion supported by the bracket, connecting a second end of the spring to a second spring attachment portion supported by the anchoring assembly, and coupling the anchoring assembly to a second orthodontic device that is installed in the patient's mouth.

Abstract: The present disclosure provides methods, devices, and systems for adjusting a tooth position. A system for adjusting a tooth position can include an attachment configured to be attached to a tooth to be moved, a dental appliance including a guide slot configured to receive the attachment and to define an adjustment trajectory of the tooth, and an adjustment band to generate force on the tooth to move the tooth along the adjustment trajectory.

Abstract: Apparatus, system, and methods for utilizing one or more computing devices to stage the movement of teeth during an alignment treatment are disclosed. The computing device receives an electronic representation of the patient's teeth in their initial position and an electronic representation of the teeth a final position for each tooth. A route each tooth will travel to reach its final position is determined, and the teeth are scheduled to move according to a movement pattern. Moreover, the schedule of movement takes into account a maximum rate of tooth movement for each tooth, the path of movement for each tooth, the distance each tooth needs to move, any needed tooth staggering, any needed round-tripping or tooth movement slowing. The invention also includes techniques for determining an optimum number of stages for the treatment based on the schedule of movement.

Abstract: Method for monitoring positioning of patient's teeth including the following steps: a) less than three months after the end of an orthodontic treatment, producing an initial reference model of the patient's arches, and, each tooth, defining, from the initial reference model, tooth model; b) acquiring at least one updated image of the arches, under actual acquisition conditions; c) analyzing each updated image and producing, for each updated image, an updated map relative to a piece of discriminating information; d) optionally determining, for each updated image, rough virtual acquisition conditions that approximate actual acquisition conditions; e) searching each updated image for a final reference model corresponding to the teeth positioning during acquisition of the updated image, and; f) for each tooth model, comparing tooth model positions in the initial reference model and in reference model obtained at the end of the preceding steps, in order to determine the movement of the teeth between steps a) and b

Abstract: The various embodiments described herein include a method for applying a set of orthodontic brackets to a set of teeth of a patient. The method includes: (1) for each tooth in the set of teeth, determining an optimal orientation for a respective orthodontic bracket in the set of orthodontic brackets to be mounted to the tooth; (2) producing a bracket applicator configured to mount each orthodontic bracket in the set of orthodontic brackets to the respective tooth in the set of teeth in the respective optimal orientation; and (3) mounting the set of orthodontic brackets to the set of teeth using the bracket applicator and a bonding material.

Abstract: A 3D virtual model of an intra oral cavity in which at least a part of a finish line of a preparation is obscured is manipulated in virtual space by means of a computer or the like to create, recreate or reconstruct finish line data and other geometrical corresponding to the obscured part. Trimmed virtual models, and trimmed physical models, can then be created utilizing data thus created. The virtual models and/or the physical models may be used in the design and manufacture of copings or of prostheses.

Abstract: The present disclosure discloses a traction bracket, an orthodontic system, and an orthodontic method thereof. The traction bracket includes a traction component, a main body, a cover body and a connecting component, wherein a surface of the main body is provided with a main groove, the main body is provided with a arrestment-traction hole, one end of the arrestment-traction hole is opened at a surface of the main body to form a traction hole, and another end of the arrestment-traction hole is opened at the main groove of the main body to form an arrestment hole, the traction component matches and is connected to the arrestment-traction hole, the main body is connected to the cover body via a connecting component, and the bottom surface of the cover body matches the surface of the main body and covers the main groove. The traction component of the traction bracket according to the present disclosure can be easily installed, and is equipped with bolt accessories in two specifications, i.e.

Abstract: A method can include producing a real model, including a reproduction of at least sections of at least two tooth crowns of teeth in a jaw and contains bracket reproductions or brackets associated with the reproductions of the tooth crowns; and producing at least two trays by producing at least one impression of the real model, wherein the trays each comprise an impression of at least one tooth crown part of the at least two tooth crowns and at least one bracket part of the at least two bracket reproductions or brackets, wherein the at least one bracket part, viewed from the occlusal surface of the associated tooth crown, extends vertically to at most the end of the wire guide and/or the end of the first undercut of the bracket and/or bracket reproduction, which is arranged after the upper wing in the view from the occlusal surface.

Abstract: The present invention relates to systems and methods for detecting deviations from an orthodontic treatment plan. One method includes receiving a tracking model, performing a matching step between individual teeth in a plan model and the tracking model, comparing the tracking model with the plan model, and detecting one or more positional differences.

Abstract: An oral appliance is provided for delivering a medicament to at least a portion of teeth and/or soft tissue areas inside a mouth. The oral appliance contains an interior surface having a medicament disposed in or on at least a portion of and/or the entire interior surface of the oral appliance. The interior surface of the oral cavity is formed to fit contours of at least the portion of the teeth and/or soft tissue areas inside the oral cavity and is configured for holding the medicament in contact with at least the portion of the teeth and/or soft tissue areas inside the oral cavity to deliver the medicament to strategic areas in need of treatment. In some embodiments, computer, network and computer readable storage media are provided.

Abstract: A scanner includes a camera, a light source for generating a probe light incorporating a spatial pattern, an optical system for transmitting the probe light towards the object and for transmitting at least a part of the light returned from the object to the camera, a focus element within the optical system for varying a position of a focus plane of the spatial pattern on the object, unit for obtaining at least one image from said array of sensor elements, unit for evaluating a correlation measure at each focus plane position between at least one image pixel and a weight function, a processor for determining the in-focus position(s) of each of a plurality of image pixels for a range of focus plane positions, or each of a plurality of groups of image pixels for a range of focus plane positions, and transforming in-focus data into 3D real world coordinates.

Abstract: According to embodiments of the disclosed subject matter, a server can include processing circuitry configured to receive a virtual modeling file encoded with an orthodontic treatment plan such that the encoded information of the virtual modeling file format allows all steps of the orthodontic treatment plan to be displayed without a separate file for each treatment step. Additionally, the processing circuitry can be configured to download a first treatment step of the virtual modeling file format, receive gingiva and teeth geometries corresponding to the first treatment step, and display the first treatment step. Further, a selected treatment step can be displayed based on information encoded into the orthodontic virtual modeling file format.

Abstract: A computer-implemented method of designing a dental restoration at a display includes providing a virtual three dimensional representation of at least a portion of the patient's dental situation. The method includes displaying a library arch form in an alignment with the virtual three dimensional representation of the portion of the patient's dentition. The library arch form includes a pair of two virtual library teeth packing to each other. The method also includes in response to a parametric change of one of the two virtual library teeth, moving the other virtual library tooth to keep packing to the changed virtual library tooth.

Abstract: Feedback data useful in prosthodontic procedures associated with the intra oral cavity is provided. First, a 3D numerical model of the target zone in the intra oral cavity is provided, and this is manipulated so as to extract particular data that may be useful in a particular procedure, for example data relating to the finish line or to the shape and size of a preparation. The relationship between this data and the procedure is then determined, for example the clearance between the preparation and the intended crown. Feedback data, indicative of this relationship, is then generated, for example whether the preparation geometry is adequate for the particular type of prosthesis.

Abstract: Presented herein are methods, systems, devices, and computer-readable media for dental prosthetics manipulation, selection, and planning. Embodiments include an overlapped, or semi-realistic 3D rendering, a localized abstraction of the dental plan, and/or a globalized abstraction of the dental plan. Various selection, manipulation, and planning functions are available for the displays. A dentist or other operator can use the various portions of the display to interact with, manipulate, and plan a dental prosthetic. In some embodiments, tools are also provided, such as a full crown manipulation.

Abstract: The purpose of the present invention is to provide a method for obtaining a more effective 3D facial image for medical use. The present invention provides a medical imaging system includes a 2D surface image obtaining device including at least one camera for photographing a plurality of 2D facial images of an examinee, at different photography angles or ranges, a visual guidance configured to fix an examinee's line of vision, an X-ray radiography device for radiographing a 3D X-ray radiograph of the examinee's head, and an image synthesis unit for generating a 3D facial image by matching the plurality of 2D facial images with the 3D X-ray radiograph.

Abstract: Orthodontic systems and related methods are disclosed for designing and providing improved or more effective tooth moving systems for eliciting a desired tooth movement and/or repositioning teeth into a desired arrangement. Methods and orthodontic systems of the invention include tooth attachments having improved or optimized parameters selected or modified for more optimal and/or effective application of forces for a desired/selected orthodontic movement. Attachments of the present invention can be customized to a particular patient (e.g., patient-customized), a particular movement, and/or a sub-group or sub-set of patients, and configured to engage an orthodontic tooth positioning appliance worn by a patient, where engagement between the attachment and orthodontic appliance results in application of a repositioning force or series/system of forces to the tooth having the attachment and will generally elicit a tooth movement.

Abstract: A prescription management system is used by an orthodontic or dental lab and a plurality of prescribing users who send prescriptions for customized orthodontic or dental appliances to the lab. The prescriptions are stored in a database selectively accessible by the lab and plurality of prescribing users. A digital workspace is provided in the system in which the lab or prescribing users may create designs for the customized appliances. The designs of the appliances are stored in the database. A tracking record of fabrication of the appliances is stored in the database. A plurality of billings are simultaneously generated in response to the submissions and storage of the prescriptions, the designs of the customized appliances and the fabrication of the designed customized appliances.

Abstract: A removable, thin-shell tooth positioning appliance having a plurality of tooth-clasping elements for removably engaging attachments bonded onto selected teeth, with flexible curved interconnecting elements connecting the tooth-clasping elements on nearby teeth.

Abstract: A normal vector or a curvature at each of a plurality of vertexes that are included in data relating to an oral cavity shape including a tooth crown shape of at least one tooth and define the oral cavity shape is acquired. Then, a vertex group that defines the tooth crown shape of the at least one tooth is extracted from the plurality of vertexes based on the acquired normal vectors or curvatures. Further, the extracted vertex group is outputted as tooth crown shape information that specifies a tooth crown portion in the oral cavity shape. Consequently, automatic construction of a database for a tooth crown shape can be implemented.

Abstract: A tray for use in bonding orthodontic appliances to selected teeth of a patient is disclosed. The tray includes an outer shell having wall sections extending over facial, lingual, and occlusal surfaces of the selected teeth to form a channel including tooth cavities having a configuration matching and arranged for receiving the selected teeth. A matrix is bonded to the inner surface of the outer shell and is contoured to complement the facial or lingual surface of the teeth. A stabilization member extends from the outer shell and includes an inside surface contoured to complement at least a portion of the facial surface of a tooth located adjacent the selected teeth. Orthodontic appliances are detachably connected to the matrix, wherein each appliance includes a base for bonding the appliance to a tooth.