44 results about "Alveolar ridge" patented technology

The invention relates to the technical field of information, and particularly provides a complete denture arrangement virtual simulation method and system, and the method comprises the steps: obtaining the medical record data of a user; the medical record data comprises edentulous jaw soft and hard tissue data, jaw bone data, alveolar ridge morphological parameters, jaw position relation data and facial feature data; determining an initial dental arch curve based on the medical record data; inputting the initial dental arch curve and preset aesthetic parameters into a preset deep learning model to obtain a plurality of initial tooth arrangement schemes; screening the plurality of initial tooth arrangement schemes according to tooth arrangement constraint conditions to obtain tooth arrangement schemes meeting constraints; the tooth position and angle of each tooth arrangement scheme meeting the constraint are adjusted until the preset occlusion balance condition is met, and the first tooth arrangement scheme is obtained, so that the tooth arrangement scheme efficiency of the complete dentures can be improved on the premise that the quality of the tooth arrangement scheme of the complete dentures is guaranteed.

The utility model discloses an oral implant which comprises a bone surface supporting structure, the appearance of the bone surface supporting structure is attached to an upper jaw alveolar bone surface or a lower jaw alveolar bone surface, and a net-shaped through hole is formed in the bone surface supporting structure and corresponds to the alveolar bone surface; a plurality of base tables protruding out of the surface are arranged on the surface of one side of the bone surface supporting structure, and the base tables are used for fixedly connecting the oral implant with a prosthesis; one end, connected to the bone surface supporting structure, of the abutment is provided with an intraosseous implant implanted into the jaw bone. According to the utility model, the traditional subperiosteal implant is improved, the subperiosteal implant is designed in the area with insufficient bone mass of the jaw bone, and the novel stent-shaped implant is formed by combining the subperiosteal implant with the intraosseous implant in the area with sufficient bone mass of the jaw bone, so that independent bone increment operation is not needed, and the implant can be implanted only by one operation; and the clinical problem that a patient with serious atrophy of the alveolar ridge is difficult to implant and repair is effectively solved.

An electroactive titanium support-reinforced composite film includes a titanium support and a film material coating the titanium support. The titanium support has a structure designed according to securing sites. The electroactive titanium support-reinforced composite film of the present invention can be bent and shaped for a close fit with a hard tissue, has excellent mechanical performance and a stable electroactive bending strength of bionic magnitude, and can prevent the collapse of surrounding tissues and tissue adhesion, effectively maintain a three-dimensional space for bone osteanagenesis and effectively promote bone injury healing, featuring ease and convenience of clinical operation and capability of promoting bone marrow mesenchymal stem cell adhesion, cytoskeleton rearrangement and induced osteogenic differentiation. The support-reinforced composite film is suitable for mandible or cranium injury repair in different ranges and has significant efficacy for clinical indications such as alveolar bone vertical bone augmentation and alveolar ridge preservation after tooth extraction.

The utility model relates to the technical field of oral medicine, in particular to a comprehensive tooth adjusting and grinding training model which comprises an upper jaw and a lower jaw, the upper jaw comprises an upper tooth socket, upper teeth are installed on the upper tooth socket, the lower jaw comprises a lower tooth socket, and lower teeth are installed on the lower tooth socket. Tooth socket pits which are consistent with the tooth roots of the corresponding teeth in shape and size are formed in the corresponding tooth positions of the upper tooth socket and the lower tooth socket, and a through hole through which the upper tooth and the lower tooth can be conveniently detached is formed in the bottom of each tooth socket pit.

The invention discloses a posterior tooth arrangement method and device based on measurement of an alveolar ridge intercrest line angle and a medium. The method comprises the following steps: acquiring an occlusion record of a patient; according to the occlusion record of the patient, establishing an upper and lower jaw edentulous jaw three-dimensional model of the patient; determining an occlusal plane of the three-dimensional model, and performing preliminary tooth arrangement on the three-dimensional model according to the occlusal plane; carrying out alveolar ridge intercrest line angle measurement on the three-dimensional model after preliminary tooth arrangement; and modifying the three-dimensional model after preliminary tooth arrangement based on an alveolar ridge intercrest line angle measurement result to obtain a posterior tooth arrangement scheme. According to the method, the included angle between the connecting line of the upper and lower jaw alveolar ridges and the occlusal plane is used as a basis for judging the arrangement mode of the back teeth, three-dimensional reconstruction is carried out on the oral cavity of the patient, digital measurement of the alveolar ridge intercrest line angle of the patient is completed in a computer, and the generated arrangement scheme of the back teeth can recover the relation between the upper and lower jaws of the patient more reasonably; the retention, the stability and the chewing performance of false tooth wearing are improved.

The utility model relates to the technical field of medical instruments, in particular to an alveolar ridge crest mucosa double-edged knife which comprises a double-edged blade, the double-edged blade comprises a cutting portion and a mounting portion, the cutting portion is of a V-shaped structure, double edges are located on the two sides of the V shape, and the included angle of the V shape ranges from 20 degrees to 30 degrees. A stepped hole used for being installed on the handle is formed in the installation portion of the double-edge blade, a clamping portion is further arranged on the double-edge blade, the clamping portion is located in the area between the V-shaped structure of the double-edge blade and the stepped hole, and the clamping portion is used for being matched with clamping pliers to achieve disassembly and assembly. When the blade is used for intraoral cutting, cutting, picking and other actions can be adopted at the same time, repeated cutting is not needed to act on the two sides of a mucous membrane, operation efficiency can be improved, finer and more uniform cutting can be achieved, and the technical problems that an existing single-edge cutting knife is limited in flexibility in use and needs repeated cutting are solved.

The invention relates to a method for measuring an alveolar bone of a missing tooth, which comprises the following steps of: a, controlling a sagittal axis to coincide with a central connecting line of cross sections of two adjacent teeth of the missing tooth on an axial plane, controlling a vertical axis to coincide with a connecting line of adjacent glaze cementum boundaries of the adjacent teeth on a sagittal plane, and controlling the sagittal axis to coincide with a tooth long axis of the adjacent teeth on a coronal plane, the coronal axis is controlled to coincide with the perpendicular line of the midpoint of the connecting line of the glaze cementum boundary of the adjacent tooth on the axial surface or the sagittal surface, the obtained coronal plane is determined as a measuring plane, and the sagittal axis, the perpendicular axis and the coronal axis are always kept in a mutually perpendicular state; and b, obtaining the width and height of the alveolar ridge of the missing tooth based on the measurement plane in the step a. The method for measuring the alveolar bone of the missing tooth has the advantages of being accurate in fixed point, small in measurement result difference, good in stability and high in repeatability.

A laser positioning device for dental occlusal centers, belonging to the field of denture manufacturing technology, addresses the problems of cumbersome operation and low efficiency associated with using an occlusal center measuring ruler to locate occlusal contact points. It includes a base platform, an optical axis vertically fixed to the base platform via a locking seat, a lower bracket slidably mounted on the optical axis, a first elongated hole along the length of the lower bracket, and a second elongated hole along the length of the upper bracket. A locking screw passes through both the first and second elongated holes and connects to a back nut. A laser emitter is vertically fixed to the upper bracket. This invention uses a laser emitter to project a fine laser spot downwards, which is used to position the tooth at a preset alveolar ridge. The center of the tooth can be found visually based on the laser spot, eliminating the need to move the pointer as required by using an occlusal center measuring ruler, thus greatly improving the efficiency of denture fabrication and adjustment.

The utility model relates to the technical field of medical instruments, in particular to a combined guide plate for oral implant surgery. The combined guide plate for the oral implanting operation comprises an operation guide plate and a guide plate base, the operation guide plate is detachably connected with the guide plate base, and the operation guide plate comprises an implantation guide plate; at least one planting sleeve is arranged on the planting guide plate, a flow channel is arranged in the planting guide plate, the flow channel is provided with an inlet end and at least one outlet end, the inlet end is used for introducing cooling liquid, and the outlet end is positioned at the lower end of the planting sleeve and is in one-to-one correspondence with the planting sleeve. The flow channel is provided with an inlet end and at least one outlet end, cooling liquid is injected into the inlet end, sent to the outlet end through the flow channel and sprayed to the contact position of the drill point and the alveolar ridge crest from the lower portion of the planting sleeve, the cooling liquid can bypass blocking of the planting guide plate and accurately and directly reach the position needing to be cooled, and the cooling effect of the drill point is improved.

The pair of wisdom tooth dislocation pliers comprises a left pliers body and a right pliers body, the front portion of the left pliers body is hinged to the front portion of the right pliers body, a right pliers mouth is arranged on the front portion of the left pliers body, a left pliers mouth is arranged on the front portion of the left pliers body, and the left pliers mouth and the right pliers mouth obliquely extend downwards from back to front. A double-wedge-shaped through groove is formed by the right side of the left clamp beak and the left side of the right clamp beak, a left clamp beak tip is arranged at the end of the left clamp beak, a right clamp beak tip corresponding to the left clamp beak tip is arranged at the end of the right clamp beak, and concave portions are arranged on the right side of the left clamp beak and the left side of the right clamp beak. The tooth extraction device is simple in structure, has double wedge-shaped working ends, can bypass adjacent teeth to enter a mesial gap between an alveolar ridge crest and a target tooth during use, uses a fulcrum of the alveolar ridge crest to apply force to dislocate the target tooth, effectively avoids damage to the adjacent teeth, efficiently realizes extraction of high-resistance normal wisdom teeth and residual roots and crowns, effectively reduces tooth extraction difficulty, reduces tooth extraction wound, and is good in consumer experience.

The invention provides a correcting device and a correcting assembly. The appliance comprises an arch-shaped body, the arch-shaped body is provided with a tooth socket and a notch, the tooth socket is used for containing teeth, the arch-shaped body comprises an occlusal pad and an outer baffle, the outer baffle is connected to the outer side of the occlusal pad, the occlusal pad forms the bottom wall of the tooth socket, the outer baffle forms the side wall of the tooth socket, the outer baffle is provided with the notch, and the notch is communicated with the tooth socket; the hooking bodies are arranged on the side, away from the tooth groove, of the outer baffle in a protruding mode, the hooking bodies comprise the first hooking body and the second hooking body, the first hooking body and the second hooking body are arranged on the two sides of the notch in the extending direction of the arch-shaped body, and the first hooking body and the second hooking body are used for being matched with the elastic rope and the tongue side buckle to pull two adjacent teeth respectively. And the two teeth are gradually pulled open, so that a gap opening process is realized. In addition, the hanging body is only of a convex structure on the appliance, and compared with a push spring in the prior art, the hanging body is simpler to use and easier to clean.

The utility model relates to the field of alveolar ridge operation tools, in particular to a miniature distraction type distraction device with an alveolar ridge widened in the horizontal direction, and adopts the technical scheme that the miniature distraction type distraction device with the alveolar ridge widened in the horizontal direction comprises a distraction bolt, a fixing plate and a distraction plate, according to the distraction device for the alveolar bone, the distraction bolt is screwed into the screw groove in the fixing plate in a threaded mode, a doctor can conveniently screw the distraction bolt to expand a split gap of the alveolar bone so as to achieve the purpose of bone distraction, and the distraction device for the alveolar bone has the advantages that the distraction bolt is screwed into the screw groove in the fixing plate in a threaded mode, so that the distraction effect is good, and the distraction effect is good. After the alveolar bone reaches the expanding thickness, the position of the bolt is kept, so that the bone is gradually formed in the gap, and then the fixing plate and the expanding plate are in rigid contact with the alveolar bone and the split gap and are firmly fixed, so that unstable bone stretching, retraction after expanding and the like are prevented, and the device is gentle to operate, small in force and free of excessive pain.

The invention discloses a digital evaluation system for an alveolar bone morphological structure, a computing device and a storage medium, and the system comprises a data preprocessing module which is used for obtaining three-dimensional image data obtained by carrying out CT or nuclear magnetic resonance examination on teeth and alveolar bones around the teeth, and completing the conversion and standardization of the three-dimensional image data; the quadrant division module is used for determining a space coordinate system constructed by taking a tooth as a central point and a tooth long axis as a central axis according to the three-dimensional image data, and dividing a plurality of quadrants according to an occlusal surface of the tooth; and the alveolar bone evaluation module is used for evaluating the overall form or structure of the alveolar bone (such as the defect state of the alveolar crest and / or the side wall of the alveolar bone) according to each quadrant. The scheme has the advantages of simplicity and convenience in operation, accuracy in evaluation, intuitive result and the like, and has wide application prospects in the field of oral medicine.

The present application relates to the technical field of oral cavity medical instruments, in particular to an oral implant and application, characterized in that the oral implant comprises an implant body and a transverse locking structure, the implant body comprises a connecting part at the coronal side and a wedge part at the root side, the upper end of the wedge part is integrally connected with the connecting part, the wedge part is provided as a plate-shaped structure, the wedge part is used for wedging into the alveolar ridge to realize guiding and positioning, the connecting part is used for connecting with the upper prosthesis, the transverse locking structure comprises a transverse channel provided on the implant body, the transverse channel penetrates through the wedge part or the joint area of the connecting part and the wedge part, is used for transversely penetrating the fixing part, and realizes locking of the implant body and the jaw bone, the oral implant is used for tooth implantation of human bodies or animals, has the advantages of simple structure, high success rate, low risk, and the like, and can adapt to different alveolar bone conditions.

A kind of degradable metal barrier film for alveolar ridge preservation, made of degradable metal, the degradable metal is magnesium-based or zinc-based or molybdenum-based degradable metal material;The degradable metal barrier film is in film or in net shape, the metal barrier film is flat structure or in arched structure.The degradable metal barrier film for alveolar ridge preservation of the application, the degradable metal system (magnesium-based / zinc-based / molybdenum-based) is applied to oral site preservation for the first time, realizes the integration of the triple function of "mechanical support, biodegradation, biological activity".The degradable metal barrier film can be used as the preparation of medical devices for alveolar ridge preservation.

The invention discloses a maxillary osteotomy positioning and fixing suite, and relates to the technical field of oral maxillofacial surgery orthognathic surgery, the maxillary osteotomy positioning and fixing suite comprises two osteotomy guide plates, an occlusal plate and a plurality of titanium battens, one end of each osteotomy guide plate is used for being clamped with a piriform nest, the other end of each osteotomy guide plate is used for being clamped with a zygomatic alveolar ridge, and the osteotomy guide plates are provided with a plurality of first nail holes; the first nail holes correspond to reserved nail holes of the maxillary bone so that the titanium nails can penetrate through the first nail holes and enter the reserved nail holes to fix the osteotomy guide plate in an operation area, the osteotomy guide plate is provided with an osteotomy groove, and the osteotomy groove is used for osteotomy operation to complete osteotomy and dissection of the maxillary bone; the biteplate is placed between the occlusal surfaces of the upper jaw and the lower jaw so as to guide the primary restoration of the osteotomy block; a plurality of second nail holes are formed in the titanium batten, and the second nail holes correspond to the reserved nail holes so that the titanium nails can penetrate through the second nail holes and enter the reserved nail holes to complete final reduction of the maxilla and fixation of the osteotomy block. The device is simple in structure and convenient to use, effectively reduces operation time and injury, and effectively improves operation efficiency.

An electrospinning apparatus and method for producing three-dimensional electrospun constructs is disclosed. Further, electrospinning apparatus and method 3D electrospun collagen based mineralized nanofibrous scaffold for alveolar ridge preservation prior to dental implant therapy are disclosed.

The present invention relates to a percutaneous dental device comprising a soft tissue region having at least two different surface regions, the at least two surface regions having different isotropic surface topographies, forming an in situ CEJ (iCEJ) at their interface, for improved soft tissue healing and / or soft tissue regeneration of alveolar crest epithelium and connective tissue on alveolar crest at a device placement site. The present invention discloses a novel dental device that mimics a natural tooth surface in a portion of the device in direct contact with upper and lower soft tissues of a tooth in situ CEJ (iCEJ) to guide and induce soft tissue healing and / or regeneration around the dental device after implantation or placement.

Disclosed in the present application is an adjustable removable denture mounting structure, relating to the technical field of removable denture mounting. The structure comprises a denture base pre-mounted on an alveolar ridge and a denture mounted on the denture base. The bottom of the denture base is integrally provided with an insert portion, an insert groove adapted to the insert portion is formed in the alveolar ridge , and a threaded tube is fixedly implanted in the insert groove. A circular groove adapted to the threaded tube is formed at the bottom of the insert portion, a connecting groove is formed at the top of the denture base, and a connecting screw is inserted into the bottom of the connecting groove. The connecting screw penetrates through the insert portion and extends into the threaded tube to be in threaded connection with the threaded tube. The bottom of the denture is integrally provided with a connecting block adapted to the connecting groove, and limiting grooves are formed on both sides of the connecting block. Empty cavities are formed on both sides of the denture base, and limiting assemblies are disposed in the empty cavities. According to the present application, the denture can be limited and fixed by means of the limiting assembly, thereby improving the stability of denture mounting and reducing the risk of detachment.

The invention relates to magnesium screws and screw-like devices for dental implant surgery and, more particularly, to magnesium and magnesium-based tenting devices for implementation in periosteal and gingival tissue overlying an alveolar ridge of a mandible or maxilla to provide vertical ridge augmentation, i.e., bone regeneration. The tenting devices may be composed of magnesium in dry form, such as metallic magnesium and salts thereof; or magnesium alloy including magnesium in dry form and at least one alloying element or compound; or magnesium-polymer composite including magnesium in dry form and at least one polymer.

A dental prosthetic positioning assembly comprises an occlusal assembly and a maxillary arch subassembly. The occlusal assembly includes a maxillary tray configured to be formed in a patient's maxillary alveolar ridge, wherein the maxillary tray comprises a occlusal rim component. The occlusal assembly further includes a carriage frame component composed of biocompatible magnetic metal material anchored to the maxillary tray. The maxillary arch subassembly comprises a plurality of prosthetic maxillary teeth components magnetically anchored to the occlusal rim component. The carriage frame component is moveable with respect to the maxillary tray. The prosthetic maxillary teeth components are individually moveable with respect to each other to achieve a desired dental positioning.

The utility model provides a bone tissue support and sealing device suitable for preserving tooth extraction fossa sites, which relates to the field of oral implantation and comprises a supporting support and a sealing body, the supporting support comprises a vertical support and two groups of horizontal cross-shaped supports, the two sets of horizontal cross supports are sequentially arranged in the axis direction of the vertical support, and the center connecting line of the two sets of horizontal cross supports is collinear with the central axis of the vertical support. The closed body is located on the upper portion of a tooth extraction socket alveolar ridge, the middle of the closed body is of a hollow structure and comprises a gingival upper portion, a gingival penetrating portion and an alveolar ridge top lower portion, the central axes of the gingival upper portion, the gingival penetrating portion and the alveolar ridge top lower portion are collinear, an inner hexagonal through hole is formed in the middle of the gingival upper portion, and four clamping notches are evenly formed in the alveolar ridge top lower portion around the central axis of the gingival upper portion. The sealing device can solve the problem of bone mass absorption of tooth extraction fossa, and is good in osteogenesis effect, good in wound sealing effect and suitable for later oral implant repair.

This invention relates to the field of oral medicine technology, and particularly to a method and system for automatic full-mouth tooth arrangement based on occlusal plane feature points. The method involves acquiring dental model information, scanning and automatically arranging teeth from both the upper and lower jaws, further acquiring the centroid coordinates of each tooth, the first limiting distance for each tooth, the feature points on each tooth surface, and the set allowed movement direction; pairing the upper and lower jaw teeth; aligning the z-axis of the centroid coordinates of each tooth pair; performing coarse registration of the tooth pairs based on the first limiting distance and the allowed movement direction; and completing fine registration of the upper and lower jaw teeth by constructing an objective function based on the point cloud data of the two teeth in the tooth pair. An objective function is also constructed based on the alveolar ridge crest line and the minimum distance between two adjacent teeth in the same jaw to optimize tooth arrangement. This invention prioritizes perfect occlusion of tooth pairs while optimizing tooth arrangement, improving the aesthetics and neatness of the tooth arrangement result.

A bite fork or bite tray device with channels to facilitate flow of impression material through the substrate while held inside a patient's oral cavity to obtain bite registration or impression consisting of full or partial teeth impression or full or partial gum impression or alveolar bone or alveolar process or alveolar ridge or a combination of these. A process for use of the system for prescription or design or manufacture of an appliance by providing the necessary steps.

The present invention pertains to devices and methods for distraction osteogenesis, with a particular focus on distraction devices and systems used to treat mandibular or maxillary alveolar ridge atrophy. It also includes methods for using these devices or systems for bone tensioning.

The present application provides a personalized retention device and manufacturing method for keratinized gingival transplantation around oral implants, relating to the field of medical device technology. The personalized retention device includes a tissue surface, which includes a keratinized area, a graft area, and a root area. The keratinized area is used to fit with the lingual or palatal area of ​​the patient's alveolar crest incision. The graft area is used to accommodate and fix the transplanted keratinized gingiva. The root area is used to fix the root-oriented reduction flap. The keratinized area is also provided with a healing abutment retention hole for accommodating the healing abutment. The graft area is also provided with an observation window for observing the fixation pressure and healing status of the soft tissue. The root area is also provided with a retention hole for a retention pin for accommodating a retention pin. The personalized retention device can achieve accurate, efficient, and stable fixation of the root-oriented reduction flap and the transplanted soft tissue, reduce surgical difficulty and operation time, and improve the widening effect of the keratinized gingiva.

The invention relates to the technical field of oral rehabilitation, in particular to an abutment crown integrated manufacturing method which comprises the following steps: acquiring intraoral scanning data and cone beam CT data, performing registration to obtain a unified patient coordinate system, and calculating a target soft tissue curved surface and a tolerance parameter set based on an alveolar ridge form, mucous membrane thickness and an implant attitude; solving an abutment main body, a crown body and a plastic neck section at the same time under the same coordinate system, dividing plastic neck section patches, and setting a propelling direction, an allowable propelling amount and a limiting groove for each patch; an integrated main body piece with a limiting groove and a plastic neck sleeve are machined, and propelling information is marked; after installation, the face sheet is shaped or retreated in a staged and directional upheaval mode according to marks, so that the gingival margin and the gingival papilla are gradually shaped, a neck margin closed contact band is established, and controllable individualized soft tissue shaping is achieved.

The utility model relates to the field of oral clinical application, specifically discloses a kind of buccal tongue mucosa pusher and rower of auxiliary mandibular edentulous jaw intraoral scanning, including buccal tongue side pusher and rower, connecting body, hand handle;The buccal tongue side pusher is respectively placed in the buccal side and the lingual side of edentulous jaw alveolar ridge, its form is adapted to the form of alveolar arch, is connected with hand handle by connecting body;The connecting body is upper end horizontal, lower end arc;The hand handle is tetragonal, and end has digital identification.The pusher and rower can effectively separate the soft tissue such as buccal tongue mucosa around edentulous jaw alveolar ridge, prevent the influence of buccal tongue mucosa to oral scanning data, and have certain pusher and rower effect to movable mucosa, can assist to determine mucosa edge, help to obtain the accurate oral scanning data of edentulous jaw;The buccal tongue mucosa pusher and rower structure is simple, easy to operate, and can be placed in the occlusal surface thereof to assist guiding intraoral scanning.

The utility model discloses a kind of six-leaf spherical bone drill, it is related to medical instrument field, wherein, six-leaf spherical bone drill includes: front end spherical tool bit, middle straight rod body and rear end limiting connection structure composition, wherein, the front end spherical tool bit includes six-leaf helical cutting edge, the structure of helical cutting edge is spherical helix structure;The diameter of the front end spherical tool bit is D1, wherein, 1.60mm≤D1≤4.40mm;The helix angle of six-leaf helical cutting edge set in the front end spherical tool bit is angle1, wherein, 27°≤angle1≤33°;Six-leaf spherical bone drill provided by the utility model is used for the bone in fresh tooth extraction nest, uneven alveolar ridge top to take out bone mud can be used in periodontal surgery to cover exposed tooth root, assist tooth firmness;The bone mud removed can be used in implant surgery to increase, widen in operation area, cover exposed implant surface, improve the survival rate of implant.

The invention discloses a positioning method and device of a tooth arrangement guide plate and a storage medium, and relates to the technical field of surgery, and the positioning method of the tooth arrangement guide plate comprises the steps that a tooth jaw reverse mold model and a tooth arrangement guide plate model are obtained, the tooth jaw reverse mold model is marked with alveolar spine feature information, and the tooth arrangement guide plate model is marked with track groove feature information; and adjusting the position of the tooth arrangement guide plate model to enable the feature information of the track groove to be matched with the feature information of the alveolar spine so as to realize positioning of the tooth arrangement guide plate model. Compared with a traditional scheme of manually placing the tooth arrangement guide plate based on experience, the method has the advantages that matching is carried out based on the feature information of the track groove and the feature information of the alveolar spine, the method is not easily influenced by human factors, human errors are reduced, and the positioning accuracy of the tooth arrangement guide plate is improved.