41 results about "Incisor" patented technology

The application discloses a kind of three-dimensional CBCT skull image fine granularity segmentation method and system.The present application includes the following steps: first, construct first training dataset;Then, in combination with first training dataset, after training secondary segmentation neural network model, obtain trained secondary segmentation neural network model;Then, using trained secondary segmentation neural network model to the three-dimensional CBCT skull image to be processed is segmented, and the segmentation result of each structure of skull is obtained;Finally, using the improved region growing method is carried out the segmentation of the bone cortex and bone marrow of upper and lower jaw bones, and the bone cortex and bone marrow segmentation result corresponding to upper and lower jaw bones is obtained, so as to complete the fine granularity segmentation of three-dimensional CBCT skull image.The method proposed in the present application can separate the fine granularity region of oral and maxillofacial region, including complete skull, upper and lower jaw bones, teeth, bone cortex, bone marrow, nerve canal, maxillary sinus, incisor canal and other structures.

The utility model discloses an orthodontic traction mechanism which comprises a molar denture and an incisor denture, the front side of the molar denture and the front side of the incisor denture are respectively welded with a fixed plate limiting head, and the front side of the molar denture is rotatably connected with an arc-edge fixed plate I through the fixed plate limiting heads; the front side of the incisor tooth support is rotatably connected with a second arc-edge fixing plate through a fixing plate limiting head, the front side of the first arc-edge fixing plate is fixedly connected with a vertical positioning head, the front side of the second arc-edge fixing plate is fixedly connected with a transverse positioning head, and the left side of the vertical positioning head and the bottom of the transverse positioning head are fixedly connected with traction positioning bent rods; according to the utility model, pulling force is applied to the teeth through the traction arch wire, the teeth are pulled back to the correct position, and under the action of the nickel-titanium tension spring and the traction rubber band, extra traction pulling force except the traction arch wire is obtained between the teeth, so that the aim of further accelerating the traction speed of orthodontic treatment can be achieved.

A mold for a dental appliance includes a dental arch portion and a beam. The dental arch portion is associated with teeth of a user. The dental arch portion includes a first distal portion, a second distal portion, and an incisor portion disposed between the first distal portion and the second distal portion. The beam extends from the first distal portion to the second distal portion. The beam includes a label portion disposed between the first distal portion and the second distal portion. The label portion forms a label for identification of the mold.

The utility model relates to a mouse head fixing operation device, and belongs to the technical field of animal experiment equipment, the mouse head fixing operation device comprises a heatable bottom plate and a clamp assembly used for limiting upper incisor teeth and mouth of a mouse, two stand columns with holes are fixed on the heatable bottom plate, a cross rod is arranged between the two stand columns with holes in a sliding mode, and the cross rod slides in the vertical direction; long movable arms are arranged on the two stand columns with the holes, one ends of the long movable arms are arranged on the stand columns with the holes in a sliding mode in the vertical direction, the other ends of the long movable arms are arranged in an overhanging mode in the direction away from the clamp assembly, ear rods are arranged at the overhanging ends of the two long movable arms in a sliding mode, and the two ear rods slide in the direction close to or away from each other; the device has the advantages that the head of a mouse is further stabilized, secondary damage to the mouse caused by an operation device is avoided, the body temperature of the animal in the operation process is kept constant, and the success rate of the operation and the accuracy of experimental data are guaranteed.

The utility model relates to the technical field of dentistry. The utility model relates to a muscle agonist for linked correction of upper and lower teeth. The muscle agonist comprises an upper invisible tooth socket and a lower invisible tooth socket, wherein the upper invisible tooth socket is sleeved outside upper teeth; the lower invisible tooth socket is sleeved outside lower teeth; the incisor part of the lower invisible tooth socket is detachably connected with the incisor part of the upper invisible tooth socket; the occlusal surface at the molar position of the lower invisible tooth socket is connected or detachably connected with the occlusal surface at the molar position of the upper invisible tooth socket through a V-shaped bent connecting strip; an angle forming plate is clamped between the upper invisible tooth socket and the lower invisible tooth socket, and the angle forming plate is positioned on the occlusal surface of at least one of the upper invisible tooth socket and the lower invisible tooth socket. According to the utility model, by optimizing the structure of the muscle agonist, the upper invisible tooth socket can be conveniently matched with upper teeth, and after the upper invisible tooth socket is matched with lower teeth, the incisor part of the lower invisible tooth socket is detachably connected with the incisor part of the upper invisible tooth socket, so that the alignment of an upper jaw and a lower jaw is realized, and the correction of dentition deformity of relative protuberance of the upper jaw and retroduction of the lower jaw is realized.

The utility model discloses a trachea cannula incisor protective sleeve, which belongs to the technical field of incisor protective sleeves and comprises an upper protective sleeve, a lower protective sleeve is arranged below the upper protective sleeve, a fixing frame is arranged on the outer side of the lower protective sleeve, two limiting blocks are slidably connected to the inner wall of the fixing frame, and a limiting column is slidably connected to the inner wall of each limiting block. The ends, away from each other, of the two limiting columns are fixedly connected with the inner wall of the fixing frame, and the side faces, away from each other, of the two limiting blocks are fixedly connected with springs. According to the trachea cannula incisor protection sleeve, the inclined moving block can drive the limiting block to move towards the two sides to be opened, meanwhile, the limiting block can extrude the spring when moving, on the contrary, the spring can conveniently assist the limiting block to conduct closing reset, and therefore the opening and closing effect of the limiting block can be controlled under the cooperation of the inclined push plate and the spring; and therefore, the air pipe in the limiting block can be conveniently limited, and the situation that the air pipe shakes during use is avoided.

The invention relates to the technical field of orthodontic tooth movement in animal experiments, in particular to a mouse orthodontic tooth movement model and a construction method thereof, and the mouse orthodontic tooth movement model comprises a traction assembly and an anchorage nail; the laboratory mouse is provided with a maxillary bone, second molar teeth growing on the maxillary bone and incisors growing on the maxillary bone, first molar teeth of the laboratory mouse are extracted, and an avoiding space is formed in front of the second molar teeth after the first molar teeth are extracted; the anchorage nail is connected to the maxillary bone and is positioned between the second molar and the incisors; the anchorage nail is fixed after being implanted into the maxillary bone, so that the position change of the traction assembly caused by connecting the traction assembly to the incisors can be avoided; the traction assembly is arranged between the second molar and the anchorage nail, the front end of the traction assembly is connected with the anchorage nail, the rear end of the traction assembly can penetrate through the avoiding space and is connected with the second molar, the second molar is used as an experimental moving tooth, and the movement rule of human clinical orthodontic teeth can be better simulated.

The invention relates to a cleaning apparatus, in particular for cleaning surfaces in the mouth, having at least one cleaning device for molars that can be guided over at least one jaw arch, and at least one cleaning device for incisors; wherein actuating devices for the movement of the cleaning devices are provided in the form of actuating rods which extend from the cleaning apparatus to the cleaning device, are extendable and retractable, and can be adjusted with regard to their lateral angle; wherein at least the at least one cleaning device for the molars has at least one clamping device which points toward at least one crown and is extendable and retractable, and is used to fix the cleaning device between two opposing jaw arches and to adjust the distance between the jaw arches.

The invention relates to a cleaning device, in particular for cleaning surfaces in the oral cavity, comprising at least one cleaning device for molars and at least one cleaning device for incisors, which can be guided over at least one dental arch, wherein actuating devices for the movement of the cleaning devices are provided in the form of actuating rods, which extend from the cleaning device to the cleaning device and are extendable and retractable and adjustable in lateral angle, wherein at least the at least one cleaning device for the molars has at least one extendable and retractable clamping device pointing towards at least one tooth crown, for fixing the cleaning device between two opposing dental arches and for adjusting a distance between the dental arches.

The utility model discloses a tooth grinding wheel for machining broken teeth and a tooth grinding module applying the tooth grinding wheel. The tooth grinding wheel comprises a cylindrical body, first single-face grinding teeth and second single-face grinding teeth. The middle of the cylindrical body is fixedly connected with a rotating shaft, the first single-face grinding tooth is provided with a right grinding face and a left suspension face, the second single-face grinding tooth is provided with a left grinding face and a right suspension face, the left grinding face is integrally connected to the right side of the right grinding face, and the axial distance between the left grinding face and the right grinding face is at least two times of the pitch of a to-be-ground piece; when a to-be-ground piece is machined, the left suspension face and the right suspension face do not make contact with the to-be-ground piece, the right grinding face machines a left tooth mountain of front teeth of the to-be-ground piece, the left grinding face machines a right tooth mountain of rear teeth of the to-be-ground piece in a tooth jumping mode, and the grinding starting point of the left tooth mountain is earlier than that of the right tooth mountain all the time. The tool has the advantages of being high in universality, high in grinding efficiency and suitable for machining a to-be-ground piece with a cylindrical blade on the left side tooth mountain and without a cylindrical blade on the right side tooth mountain, and the service life of the to-be-ground piece is long.

The invention discloses a multifunctional fixing device for mouse ventricular micro-injection and a using method. The multifunctional fixing device comprises an operation table, a height adjusting assembly, a fixing plate, a cranial height adjusting frame, a mounting base, an incisor hook and an ear rod. Wherein the operation table comprises a bottom plate and a vertical plate which are vertically connected, a sinking groove is formed in the bottom plate, and a lifting table is arranged in the groove; the height adjusting assembly is parallel to the vertical plate and close to the bottom plate side; the fixed plate is provided with two symmetrical extension strips at the moving end of the adjusting assembly and on the deviating side, the other surface of the fixed plate is provided with a length adjusting groove, and a first driving piece is arranged in the groove; the cranial height adjusting frame is connected with the first driving piece and provided with a second driving piece. A fixing hole is formed in the far end of the mounting seat; and the incisor hook is arranged on the mounting seat and is positioned above the fixing hole. The two ear rods are symmetrically arranged at the far end of the extension strip. The scheme has the effects of reducing damage to mice, reducing experimental pollution and improving operation stability.

This invention discloses a method for determining digital dental malformation torque attachments. First, a digital dental malformation model is established based on the patient's CBCT data. The jawbone and tooth roots are shelled along the normal to obtain a three-dimensional model of the periodontal ligament. Boolean operations between the periodontal ligament and jawbone are used to obtain a digital dental malformation model containing the periodontal ligament. The digital dental malformation model, the constructed attachment model, and the invisible aligner model are assembled to obtain a digital dental malformation finite element simulation model. Then, the digital dental malformation finite element simulation model is meshed, material parameters are defined, and boundary conditions are determined. Finally, the initial tooth displacement and periodontal ligament stress distribution are analyzed based on the constructed digital dental malformation finite element simulation model to determine the safety of the attachment design for the movement of a specific individual incisor and the effectiveness of the torque design. Based on the interpretation results, the attachment design is modified or the attachment design is finalized.

The invention relates to a cleaning device, in particular for cleaning surfaces in the oral cavity, comprising at least one cleaning device for molars and at least one cleaning device for incisors, which can be guided over at least one jaw arch, wherein at least one extendable and retractable biting device is provided, for arrangement between two opposing jaw arches and for adjusting a distance between the jaw arches.

A movable tooth appliance is provided with a base plate, a hyperbolic reed used for generating acting force on incisors, a retention device fixed to molars and a tongue bar which abuts against a tongue so as to prevent the tongue from stretching forwards, and the hyperbolic reed, the retention device and the tongue bar are all fixedly assembled on the base plate; the tongue bar is located on the tongue side of the incisors and located behind the hyperbolic reed. According to the movable tooth appliance, the fixing device is used for fixing the interior of the whole oral cavity of the movable tooth appliance, the hyperbolic reed acts on incisors, an area abutting against the tongue is formed through the tongue bar, the tongue is prevented from stretching forwards accidentally, and then bad habits such as tongue stretching, tooth licking, finger sucking and primary tongue vomiting are avoided; therefore, the correction effect of the ground bag is improved.

The utility model discloses a muscle function training device, including deep coincidence appliance and opening and closing appliance, deep coincidence appliance includes first enclosure and first biteplate, first enclosure is the arch that matches the dental arch, first biteplate is provided in the central position of the inside of first enclosure, the width of first biteplate is less than the width of first enclosure, and the width of first biteplate is less than the width of first enclosure. The first biteplate can only be occluded by anterior teeth and cannot be occluded by posterior teeth; the opening and closing appliance comprises a second enclosure and two second biteplates, the second enclosure is in an arch shape matched with the dental arch, and the two second biteplates are symmetrically arranged at the two ends of the inner side of the second enclosure, so that the second biteplates can only be occluded by the rear teeth and cannot be occluded by the front teeth. According to the muscle function training device disclosed by the utility model, special training of deep folding or opening and closing can be carried out according to the actual condition of a patient, and the correction and training effects are improved.

The invention discloses an orthodontic bracket assembly and an orthodontic assembly bag for controlling axial inclination of teeth, and belongs to the technical field of orthodontics. The component comprises a bracket main body, a vertical accommodating part and a plug part, the bracket main body is used for being connected with a tooth body, the vertical accommodating part is fixed on the bracket main body, the inner surface of the vertical accommodating part is provided with a non-orthogonal geometric constraint or separation contact component, and the plug part can be inserted into the vertical accommodating part and is provided with an eccentric stress part. When traction is applied to the eccentric stress part, the plug part and the vertical containing part form two opposite counterforces in the non-adjacent area to form a couple, and tooth axial inclination control is achieved. According to the invention, the axis control torque can be reliably and predictably established in the early stage, the middle stage and the fine stage of orthodontic treatment, delaying, shaking and energy dissipation in the torque transmission process are avoided, the device is suitable for complete tooth positions such as incisors, canine teeth, bicuspid teeth and molar teeth, and the orthodontic efficiency and effect are effectively improved.

A method is of designing a virtual three-dimensional (3D) model of a mold for a dental appliance. The method includes determining an identifier to be associated with the mold. The mold includes a dental arch portion associated with teeth of a user. The dental arch portion includes a first distal portion, a second distal portion, and an incisor portion disposed between the first distal portion and the second distal portion. The method further includes determining, based on the identifier, a label to be formed in a label portion of a beam of the mold. The method further includes determining a placement of the beam. The beam extends from the first distal portion to the second distal portion in the virtual 3D model of the mold.

The invention provides a construction method and application of a high-precision controllable rat molar wear model, and belongs to the technical field of oral medicine animal models. According to the method, after the rat is fed with hard food, anesthesia is performed, the oral cavity is opened, and the rat incisor is stimulated by selecting or not selecting any one or more modes of acid erosion and thermocycling stimulation, so that the high-precision controllable rat molar wear model is obtained. The invention develops an acid etching-hard food-cold and hot cycle three-factor time sequence controllable modeling system by simulating the diversity reasons of clinical wear, controlling the types of pathogenic factors and the model construction time to accurately control the severity degree of wear and simulating the progressive process of human functional occlusion wear. A wear model is established in the SD rat molar. The wear form of the model is a composite horseshoe-shaped wear pit which is highly matched with the morphology and biology of human pathological wear. As an experiment is carried out on the living medullary teeth, the pathological manifestation is consistent with the pathological manifestation of clinical progressive wear.

The application discloses a double-main-groove three-section multifunctional oral cavity correction system, which comprises self-locking brackets, a first buccal tube, a second buccal tube and an arch wire system. The self-locking brackets are arranged on all incisors, canines and premolars in a tooth system, and the self-locking bracket comprises a bracket body and a bottom plate, and the bracket body and the bottom plate are connected. The application further discloses a double-main-groove three-section multifunctional oral cavity correction method. The application combines the segment arch technology, the auxiliary arch technology and the sliding method gap closing technology, and greatly reduces the friction uncontrolled, the unfavorable alignment and the loss of anchorage in other correction systems, so that the correction result is more controllable.

The application discloses a simulation oral cavity model, relates to the technical field of oral cavity models, and comprises a model base, a middle tooth area corresponding to the middle part of a jaw bone, a molar area corresponding to the two sides of the jaw bone, a middle body installed in the middle tooth area, and incisors and canines installed on the middle body; a stabilizing strip plate is fixedly arranged in the molar area of the model base and is provided with insertion grooves in the two side walls; two side edge bodies are installed with double canines and molars, the bottom of each side edge body is provided with a sliding groove, a clamping block is fixedly arranged on the inner wall of the sliding groove, the stabilizing strip plate can slide into the sliding groove, the clamping block abuts against the inner wall of the insertion groove, and the side edge body can be fixedly installed with the middle body; when the side edge body abuts against the middle body, the side edge body is connected with the side wall of the model base, and the side edge body is connected with the side wall of the middle body. The application has the effects of diversified display of oral cavity pathologies and cost saving.

The utility model belongs to an improved orthodontic device suitable for double-jaw prolapse. The utility model aims to solve the problems that the anchorage control difficulty is high in the process of correcting the double-jaw proprocess, the side effect of molar loss anchorage is large, the correction of a patient is uncomfortable, and the operation is tedious. According to the technical key points, upper and lower central incisor teeth, lateral incisor teeth, canine teeth and first permanent molar teeth are bonded with a common transmission appliance bracket; the upper jaw round wire main arch wire and the lower jaw round wire main arch wire are in an arc shape, are provided with two small circles and two rear bends and penetrate through a groove in a bracket of an ordinary transmission appliance, and the upper anterior tooth adduction leather ring is connected with the small circles on the upper jaw round wire main arch wire and anchorage molar teeth of the lower jaw. And the lower anterior tooth adduction leather collar is connected with the small loop on the round wire main arch wire of the lower jaw and the anchorage molar of the upper jaw. The device is suitable for orthodontic treatment of double-jaw prolapse cases.

The utility model discloses an invisible orthodontic appliance with an improved root control structure. The invisible orthodontic appliance comprises an invisible orthodontic appliance body and the improved root control structure, the improved root control structure is arranged corresponding to at least one of the one-third position of the lip face neck area of a single anterior tooth and the one-third position of the mesial adjacent face neck area and / or the distal tooth tip area, and is arranged on the inner surface of a cavity, used for containing teeth, of the invisible orthodontic appliance body. The improved root control structure is a solid structure formed by locally thickening the invisible orthodontic appliance body relative to the inner surface of the cavity to the tooth surface of the anterior tooth, and extends along at least one of the near-far-middle direction and the lip-tongue direction; wherein the anterior teeth are selected from at least one of incisor teeth and canine teeth.

This utility model discloses a protective sleeve for supporting laryngeal surgery, comprising a deformable sheet, a contact pad fixedly installed on the inner side of the deformable sheet, and a protective pad fixedly installed on one side of the deformable sheet. The protective pad includes a buffer layer, a pressure-resistant layer, and a wear-resistant layer. The buffer layer covers one side of the deformable sheet, the pressure-resistant layer covers one side of the buffer layer, and the wear-resistant layer covers one side of the pressure-resistant layer. This utility model involves placing the contact pad on the outside of the patient's upper incisors, with the protective pad facing outwards. The deformable sheet is then pinched against the outside of the upper incisors, allowing the deformable sheet and contact pad to conform to the shape of the patient's upper incisors. At this point, the contact pad is in close contact with the upper incisors, preventing separation. The protective pad blocks the front side of the deformable sheet, and when the upper incisors are used as a support point for the laryngoscope, it isolates the laryngoscope from the upper incisors and provides a cushioning effect, reducing patient discomfort.

This invention discloses a medical anti-displacement temperature measuring dental pad, comprising a dental pad body. The side wall of the dental pad body has an arc-shaped concave groove, and the inner wall of the dental pad body has two C-shaped guide rope holes, located on opposite sides of the arc-shaped concave groove. An installation groove is formed on the inner wall of the dental pad body away from the arc-shaped concave groove. Through the segmented and precise layout of the C-shaped guide rope holes, the rope loop, after passing through the guide rope holes, forms two independent and cooperative fixing points on the inner and outer sides of the incisors. The dual-point fixing structure works synergistically to restrict the dental pad's rotational freedom and displacement space, ensuring the dental pad remains stable and preventing displacement due to unconscious patient movements. Simultaneously, the dual-point fixing structure securely confines the endotracheal tube within the arc-shaped concave groove of the dental pad, ensuring a tight fit between the endotracheal tube and the dental pad. This not only prevents dental pad rotational displacement but also effectively protects the endotracheal tube from being bitten or crushed.

The utility model provides a lip and tooth protection device which comprises a tooth socket and a lip socket connected to one side of the tooth socket in an overturning mode. The tooth socket and the lip sleeve are of an integrally-formed soft structure. Wherein the tooth socket is internally provided with a V-shaped groove matched with an incisor, the lip socket is provided with a 7-shaped groove matched with a lip part, and a tooth lip-gum outer edge matched with a gingival root and a lip-gum sulcus is formed at the top of a joint of the lip socket and the tooth socket. According to the lip and tooth protection device, the V-shaped groove of the tooth socket and the 7-shaped groove of the lip socket are designed, so that the device can be better matched with the oral cavity structure of a patient, and customized protection is provided for upper incisor teeth and upper lips in the operation process. In addition, due to the integrally-formed soft structure design of the device, the comfort level of the patient is improved, postoperative recovery is facilitated, and extra damage and treatment cost caused by misuse of instruments are reduced.

The utility model relates to the technical field of dental implant teaching appliances, in particular to a teaching physiological anatomical model based on severe bone deficiency edentulous jaw, which comprises a model main body for simulating the physiological anatomical structure of the maxillary bone, and a plurality of prefabricated holes are arranged on the model main body. The layout and the direction of the prefabricated holes comprise left and right wing penetrating holes, left single zygomatic penetrating holes, right double zygomatic penetrating holes, right maxillary sinus anterior inclined holes, left transsinus holes, left and right turbinate ridge holes, left and right anterior nasal spinous proximal inclined holes, incisor canal holes and anterior nasal spinous holes; the hole diameter, the hole depth and the inclination angle of each prefabricated hole are set according to the anatomical characteristics of the severe bone deficiency edentulous jaw, and each prefabricated hole is internally provided with a guide channel used for movement of an instrument, so that an operator can practice in the guide channel through the instrument to meet the practice of different dental implant operations. According to the utility model, the planting hole positions are accurately arranged on the model, so that different operation requirements can be met, and the practical operation capability of a doctor in a complex operation scene can be improved.

The present invention relates to a single-use protective device (200) intended to be positioned removably on an upper face (133) of a laryngoscope blade (1) in order to come into contact in particular with the upper incisors (I) of a patient during intubation, the protective device (200) comprising an elongate strip (201), the inner face (201a) of which is configured to fit the shape of the upper face (133) of the blade (1) and the outer face (201b) of which, which is intended to be in contact with the incisors (I) of the patient, is made of a shock-absorbing material, such that, during intubation, the protective device (200) at least partially covers the upper face (133) of the blade (1) and acts as a shock absorber between the blade (1) and the upper incisors (I) of the patient.

The utility model relates to the technical field of dentistry. The tooth socket with the expansion and front traction functions comprises a tooth socket base body, and the tooth socket base body comprises a first molar coating part, a first transition connecting part, a middle incisor coating part, a second transition connecting part and a second molar coating part which are connected in sequence; the first transition connecting part and the second transition connecting part are provided with hollow structures; the first molar coating part and the second molar coating part are connected through an expansion arch structure, and the middle part of the expansion arch structure is a bending structure which is arranged in a roundabout manner; traction connecting pieces for front traction are fixed on the lip side of the first molar coating part and the lip side of the second molar coating part, and the traction connecting pieces are limiting buckles or tubular structures. According to the utility model, the structure of the tooth socket is optimized, the arch expansion function is realized through the arch expansion structure, and the front traction function is realized through the traction connecting piece, so that the arch expansion function and the front traction function are integrated on the tooth socket.

The utility model provides a three-dimensional positioning device for the brain of an experimental mouse, which belongs to three-dimensional positioning devices for the brain of the experimental mouse and comprises a base, a fixed column and a limiting rod are arranged at one end of the base, a movable seat is movably connected onto the fixed column, and the movable seat is further movably connected with the limiting rod; the movable seat is arranged to be E-shaped, two end arms of the movable seat are movably connected with lug rods, and a spacer arm of the movable seat is movably connected with an incisor fixing rod; a clamping piece is hinged to the incisor fixing rod. The three-dimensional positioning device can be adjusted according to the skull size and the size of the laboratory mouse, and the fixing effect on the laboratory mouse is improved.

The application relates to the technical field of digital oral cavity, and relates to an automatic determination method of tooth feature points, which comprises a data preprocessing stage, in the XOY plane of a global coordinate system, a projection point of a target tooth mass center coordinate, a projection point of a left adjacent tooth mass center coordinate and a projection point of a right adjacent tooth mass center coordinate form a triangle, a center and a radius of a circumscribed circle of the triangle are obtained, a local coordinate system is established, feature points of the target tooth are determined, the tooth is divided into canines, incisors and molars, and the molars are divided into premolars and molars; and a protrusion point of a mesial and distal surface of the target tooth is determined. The application can be realized through a computer program, and then the feature points of each tooth can be automatically obtained after the tooth model is imported into the computer.