46 results about "Mouth Rehabilitation" patented technology

The invention relates to a biomedical beta-titanium alloy material and a preparation method, and belongs to the technical field of preparation of titanium alloy materials with high niobium content. The alloy comprises the following components in percentage by mass: 30-40 percent of Nb, 5-15 percent of Zr, 1-10 percent of Sn, 0.1 and 0.3 percent of O and the balance of Ti. The titanium alloy has high comprehensive performance, and the strength and the elastic modulus of the alloy can be modulated and controlled by different heat treatment processes; the elastic modulus E of the alloy is 40-68GPa; the yield strength sigma 0.2 is 580-800MPa; the tensile strength sigma b is 750-1120MPa; the elongation ratio epsilon is 12-48 percent; and the section shrinking percentage is 36-65 percent. The titanium alloy does not contain toxic elements, has excellent corrosion resistance, biocompatibility and cold treating performance, and can perform cold rolling in a large deformation amount. The titanium alloy is wide in use, so that the titanium alloy can be used for manufacturing tissue recovery or replacement materials of a human body of mouth rehabilitation, artificial bone, joint prosthesis and the like, and also can be used for manufacturing machines in sports and industry.

The invention relates to a 3D printing composite material for mouth rehabilitation and a preparation and using method of the 3D printing composite material. The 3D printing composite material for mouth rehabilitation is characterized by comprising the following components in parts by weight: 10-40 parts of low-viscosity monomer, 10-40 parts of enhanced monomer or low polymer, 150-200 parts of ceramic powder, 5-20 parts of expansion monomer, 5-15 parts of a dispersing agent, 2-6 parts of a short-wave photoinitiator, 1-3 parts of a long-wave photoinitiator, 1-3 parts of an ultraviolet absorber and 2-5 parts of polymerizable quaternary ammonium salt anti-bacterial monomer. The 3D printing composite material for mouth rehabilitation is small in curing shrinkage, short in curing time and high in anti-bacterial property, and is suitable for manufacturing a dental prosthesis.

A denture liner which includes a hydrophobic polymer component, a plasticizer component and an adhesive component. A method for making this denture liner and a denture liner kit are also provided. The compositions have improved consistency and are useful in prosthodontics, including formulating denture liners for the compositions have a glass transition temperature lower than the lower of an ambient temperature at which the liner is applied and a temperature inside the oral cavity. Phthalate-free embodiments, as well as kits are also described.

The invention discloses a removable denture and a manufacturing process thereof and belongs to the technical field of mouth rehabilitation. The removable denture has the advantages that the foreign body sensation is low and the simulation performance is good after the removable denture is worn. According to the technical scheme, the removable denture comprises bionic teeth and a base plate; the bionic teeth are fixed to the base plate, bionic resin fixing snap rings stretching to the two ends are integrally arranged on the lip and cheek side of the base plate, stainless steel wire bent snap rings and / or stainless steel wire continuous snap rings stretching to the two ends are fixed to the tongue palate side of the base plate, fixing regions fixed with natural teeth are formed on the two sides of the base plate by the bionic resin fixing snap rings and the stainless steel wire bent snap rings, and tooth brackets are arranged on the portions, close to the two sides of the fixing regions, of the base plate.

The invention discloses an automatic extracting method of a neck-edge line of a preparation body grid model. The method comprises S1, calculating the average curvature of a vertex of the preparation body grid model, S2, processing an obtained curvature value through adoption of method based on K-means clustering to obtain a characteristic point set F, S3, obtaining a fold line point set F<z> through adoption of an improved fold line growth technology and then generating a characteristic line, S4, optimizing the characteristic line, and S5, taking a point on the characteristic line after optimization as a control point to obtain the neck-edge line through fitting. The method has the advantages of high extraction precision, good robustness and the high automation degree, and can be widely applied to the field of mouth rehabilitation.

The invention relates to a mouth rehabilitation ceramic material, comprising the following components in percentage by mass: 0.20-5.00% of Y2O3, 0.10-5.00% of HfO2, 0.10-6.50% of Al2O3, 0.80-2.70% of SiO2, and the balance of ZrO2. The mouth rehabilitation ceramic material has the excellent performance of ZrO2 ceramic, is good in biocompatibility, has excellent properties including high hardness, high strength, high tenacity, ultra-high abrasion resistance and chemical corrosion resistance and the like, and is good in processability and optical performance, and the refraction and scattering coefficients of the mouth rehabilitation ceramic material are similar to those of tooth body tissues, so that the transparency, color and luster of natural teeth can be reproduced. Besides, the mouth rehabilitation ceramic material is sintered into ceramic blocks in use and does not contain a metal material, so that gingival color changes and inflammation caused by the release of metal ions are avoided, and nuclear magnetic resonance and computed tomography examinations cannot be influenced.

The invention discloses a novel fish skin source oral repair membrane and a preparation method thereof. Fish skin acellular dermal matrixes and EDC / NHS cross-linking agents are cross-linked to obtainthe oral repair membrane. The preparation method of the oral repair membrane includes the steps: taking a fresh fish skin as a raw material, removing fish meat, cleaning the fish skin without the fishmeat, performing enzymatic degreasing and hydrogen peroxide discoloring, disrupting cells by an alkaline method and an ultrasonic auxiliary mode, and removing impurities to obtain the fish skin acellular dermal matrixes; preparing the EDC / NHS cross-linking agents; soaking the fish skin accellular dermal matrixes into the EDC / NHS cross-linking agents, repeatedly performing ice bath ultrasonic every 1-2min, and placing the fish skin acellular dermal matrixes into a magnetic stirring apparatus to stir the matrixes to obtain a cross-linked oral repair membrane; washing the cross-linked oral repair membrane under the sterility condition, and drying, packaging and sterilizing the washed cross-linked oral repair membrane. The fish skin source oral repair membrane is excellent in mechanical property and heat stability, high in degradation resistance and high in safety.

The invention discloses biological calcium carbonate chitin, a preparation method of the biological calcium carbonate chitin and application of biological calcium carbonate chitin, and belongs to the preparation and processing filed of organic polymer matter. Aiming at single development and utilization of extraction of chitin in crab carapaces in the prior art, the invention provides a preparation method of the biological calcium carbonate chitin in which a natural compound structure of calcium-carbonate-chitin in the crab carapaces is kept. The preparation method of the biological calcium carbonate chitin comprises preparing and obtaining even ultramicro crab carapace powder through superfine grinding of the crab carapaces and wet sieving, carrying out removal processing of pigment and fatty acid on the ultramicro crab carapace powder through a repeated boiling and centrifugation method, removing protein through repeated sodium hydroxide solution hydrolysis and high speed centrifugation at a certain temperature, and obtaining the biological calcium carbonate chitin without the pigment, the fatty acid and the protein. The biological calcium carbonate chitin which is prepared and obtained is used in commodity polymer materials and plays a part of strengthening, and can further be used as a calcium supplement agent, be used in bone tissue repair and be used as a calcium source for mouth rehabilitation materials.

The invention relates to a resin adhesive material with good hydrophobic performance, a preparation method and an application of the material in filling treatment of tooth hard tissue defects of mouth rehabilitation and belongs to the technical field of stomatological materials. The material is composed of a main component, a diluent and a photoinitiator, wherein the main component is a mixture of isocyanate terminated polyether triol and polyurethane dimethacrylate and accounts for 50-70%; the diluent comprises methyl methacrylate and butyl acrylate which respectively account for 10-20% and 19-27%; and the photoinitiator is a mixed initiation system composed of ethyl-4-dimethylamino ethyl benzoate and camphorquinone and accounts for 1-3%. The material provided by the invention does not contain hydroxyl, carboxyl, phosphate groups and sulfonic groups which are prone to absorb water and swell, has good hydrophobic performance, can effectively prevent infiltration and absorption of water molecules, and meanwhile further has good tensile strength; and the material effectively prevents micro-leakages after repair, so that occurrence of restoration breakage and secondary caries which are common clinically is greatly reduced.

The invention discloses a ceramic material used for mouth rehabilitation. The ceramic material is prepared from the following components in parts by weight: zirconia, nanometer aluminum oxide, niobium pentoxide, rare earth oxide, rectorite, molybdenum boride, aluminium borate, calcium-magnesium silicate whisker and fluorapatite. The invention also discloses a preparation method of the ceramic material used for the mouth rehabilitation. The Vickers hardness of the ceramic material used for the mouth rehabilitation exceeds 21.4GPa, the bending strength of the ceramic material exceeds 963.2MPa, and the breaking tenacity of the ceramic material is higher than 16.3MPa.m1 / 2. The defect of the traditional ceramic material that the traditional ceramic material is likely to be subjected to brittle failure since the traditional ceramic material is crisp is eliminated, a clinic success rate is improved, and the ceramic material can be used as a mouth rehabilitation material and has a wide application prospect.

The invention discloses construction and application for tissue-engineered bone with BMSCs transfected with genes in a combining manner. According to the invention, recombinant lentiviral vectors carrying human bFGF, BMP-2 and GFP genes are constructed, BMSCs are transfected with the genes, the osteogenesis function of BMSCs can be enhanced through human bFGF and BMP2 gene combined-transfection, the fact that bFGF / BMP2 can adjust OPN, collagen-I and other osteogenesis nonspecific gene expression mechanisms is proved, and a GFP-marked tissue-engineered bone is constructed by gene transfected BMSCs composite heterologous bone scaffold material, and a jaw defect animal model is replanted. According to the invention, defects of single gene transfection are overcome, blood vessel forming and osteogenesis functions for solving difficulties in tissue-engineered bone tissue construction and application thereof to jaw defect repairing are obtained, a bone grafting material which has a wide application prospect is provided for mouth rehabilitation and bone transplantation treatment, and a high practical value and practical significance are realized.

The invention discloses a high-Mo-content biomedical beta-titanium alloy and a preparation method thereof. The alloy comprises three alloy elements including titanium (Ti), molybdenum (Mo) and stannum (Sn). Alloy components of the alloy comprise, by weight percent, 20%-60% of the molybdenum (Mo), 0-20% of the stannum (Sn) and the balance titanium (Ti). The alloy is prepared through a high-temperature melting method, an electric arc melting method, a powder metallurgic method, a high-frequency induction method or a mechanical alloy method. The alloy has the following beneficial effects that the alloy elements including molybdenum and stannum completely compatible with the human body are selected, excellent biocompatibility is achieved, and toxicity is avoided; and the elasticity modulus is low (E=50-60 GPa) and is lower than that of a Ti-6Al-4V alloy by 40%-50%. The alloy can be used as a biomedical titanium alloy for dentistry and is mainly used for clinic mouth rehabilitation, implanting, orthodontics and the like.

An oral rehabilitation device for rehabilitating the oral cavity of a user includes a device body, a first activating member, an upper-jaw member, a lower-jaw member, and a processing unit. The first activating member is disposed on an end of the device body. The upper-jaw member and the lower-jaw member are connected to the same end of the device body and are for contacting an upper jaw and lower jaw of the user, respectively. The processing unit is coupled to the first activating member and is used to control the first activating member to drive one of the upper-jaw member and the lower jaw member to open or close relative to the other of the upper-jaw member and the lower-jaw member, such that the upper jaw and the lower jaw can be rehabilitated. The present invention further discloses a medical treatment system to which the oral rehabilitation device is linked.

The invention relates to a 3D printing composite material for mouth rehabilitation and a preparation and using method of the 3D printing composite material. The 3D printing composite material for mouth rehabilitation is characterized by comprising the following components in parts by weight: 10-40 parts of low-viscosity monomer, 10-40 parts of enhanced monomer or low polymer, 150-200 parts of ceramic powder, 5-20 parts of expansion monomer, 5-15 parts of a dispersing agent, 2-6 parts of a short-wave photoinitiator, 1-3 parts of a long-wave photoinitiator, 1-3 parts of an ultraviolet absorber and 2-5 parts of polymerizable quaternary ammonium salt anti-bacterial monomer. The 3D printing composite material for mouth rehabilitation is small in curing shrinkage, short in curing time and high in anti-bacterial property, and is suitable for manufacturing a dental prosthesis.

The invention discloses a mouth rehabilitation device. An opener, a tongue stop plate, an LED lamp and a rehabilitation handle are arranged into a whole. During mouth rehabilitation, the mouth and the tongue of a patient are easily fixed, and use is convenient; the appropriate opener is selected according to the size of the opening degree amplitude of the mouth of the patient, the mouth rehabilitation device is placed into the mouth of the patient, the mouth can be supported and the tongue can be stopped by pushing the opener away, and then a water absorption device is placed into the mouth of the patient. During mouth rehabilitation by a medical worker, the mouth rehabilitation device is easy to operate, time and labor are saved, and the operation difficulty of the medical worker is reduced. The mouth rehabilitation device is provided with a cover body which can shield the ulcer portion so as to separate the ulcer portion from the moisture environment, medicine can be applied at the same time, the treatment cycle is shortened, and the mouth rehabilitation device is convenient to use and practical. According to the mouth rehabilitation device, an inner crown and an outer crown can replace a medicine feeding pipe, so that the stable and reliable medicine feeding route is provided, controlled release or slow release or effect improvement of medicine is better achieved, and the phenomena that the medicine is dissolved in an excessively-fast mode, the medicine is swallowed by mistake are avoided.

The invention discloses a multifunctional oral cavity trainer. According to the trainer, an umbrella-shaped body is connected to each of two heads of a handle, one of the umbrella-shaped bodies is composed of an upside-down umbrella cover and an umbrella handle, and the other umbrella-shaped body is composed of an upside-down umbrella cover, an umbrella handle and a sharp-tongue-shaped body extending from the inner umbrella circle center. Shapes of the umbrella covers and the sharp-tongue-shaped body, both made of elastic materials such as soft resin, of the umbrella-shaped bodies can be changed during operation of the umbrella covers and the sharp-tongue-shaped body, so that opening and closing of mouths, occlusion of upper and lower jaws and tongue turning in up, down, left and right directions are guided, swallowing reflex is stimulated, and lip closing capability, palate muscle groups, masticatory muscle groups, tongue muscle groups and pharynx muscle groups are trained; by the trainer, efficiency of existing swallowing rehabilitation training is improved through synchronous and coordinated exercises of muscle groups involved during ingesting, chewing and swallowing. The multifunctional oral cavity trainer has the advantages of simplicity in operation, safety in use and easiness in popularization for clinical medicine and family care.

The invention relates to a multifunctional stomatoscope for mouth rehabilitation and treatment. The multifunctional stomatoscope comprises a lens head, a holding rod, an elastic connecting rod, a rigid sleeve and a sliding sleeve which is pushed by a user to slide, the elastic connecting rod is connected with the holding rod and the lens head; the rigid sleeve sleeves the periphery of the elastic connecting rod; the rigid sleeve is fixed to the sliding sleeve; the holding rod is sleeved with the sliding sleeve in a sliding mode. The rigid sleeve comprises a linear section extending linearly and a curved section in an arc shape; the bent section is arranged at one end of the linear section away from the sliding sleeve; the elastic connecting rod is in a bent arc shape in the free state, and the bending degree of the elastic connecting rod in the free state is larger than that of the bent section. When the sliding sleeve slides relative to the holding rod, the rigid sleeve is driven to slide relative to the elastic connecting rod, and therefore the length of the end, exposed out of the rigid sleeve, of the elastic connecting rod is adjusted. The beneficial effect of the invention is that the angle of the lens can be adjusted.

The invention discloses an automatic preparation body neck-edge line extraction method based on MS complex. The method comprises the following steps: S1) establishing an MS complex structure; S2) carrying out noise reduction processing; S3) carrying out MS complex simplification; S4) screening feature lines; and S5) evolving the feature lines into neck-edge lines. The method is high in efficiency and insensitive to noise, can automatically extract more accurate neck-edge lines, and can be widely applied to the mouth rehabilitation field.

The invention provides a mouth rehabilitation metal dowel pin removal device, and belongs to the field of mouth rehabilitation medical devices and instruments. The mouth rehabilitation metal dowel pin removal device includes a slider, a slide hammer, a parallel rod, a movable joint, a male piece, a female piece, nuts and a screw rod, wherein one end of the slider is fixedly connected with the slide hammer, the slider and the slide hammer form an impact device, the other end of the slider is movably connected with the parallel rod, the tail end of the slider passes through the parallel rod, the tail end of the slider is mounted with the nut, the male piece is connected with the parallel rod through the movable joint, one end of the female piece is movably sleeved on the thread of a screw rod, the other end of the female piece is movably connected with the male piece in a cross manner, the male piece and the female piece form a clamping mechanism, one end of the screw rod is fixedly connected with the parallel rod, the other end of the screw rod is provided with the nut, and the parallel rod, the nut and the screw rod constitute a force-applying device. The removal device is simple in structure, convenient to operate, low in cost, and suitable for dental clinical application. The removal device has good market prospects and facilitates good application in the field of medical devices.

The invention belongs to a mouth medical technology, and in particular relates to a telescope crown magnetic retainer connection device. A center post core and an inner crown of a magnetic retainer movable denture and a telescopic crown easily drop in the mouth rehabilitation, a patient needs to repeatedly repair the center post core and the inner crown to cause that the inconvenience is brought for life and the paint of the patient is increased and the treatment cost is increased. The telescope crown magnetic retainer connection device comprises a movable denture (1), a magnet (2), an armature (6) and a center post core (7), wherein a residual root and crown which has no remarkable loosening is selected, and subjected to root canal therapy, the center post core (7) is made, and is placed in the residual root and crown (8), the top end of the center post core (7) is connected with a connecting rod (3), the other end of the connecting rod (3) is connected with an inner crown (4) of the telescopic crown, an outer crown (5) is arranged on the outer part of the inner crown (4), and an abutment tooth (9) is arranged in the inner crown (4). The telescope crown magnetic retainer connection device has the advantages that the service life of the magnetic retainer movable denture and the telescopic crown are prolonged, and the pain and the treatment cost of the patient are reduced.

The invention relates to dental restoration mouthwash powder. The dental restoration mouthwash powder comprises the following raw materials in parts by weight: 0.01 to 0.03 part of oligopeptide-1, 0.03 to 0.05 part of sodium fluoride, 0.002 to 0.005 part of chlorhexidine, 0.03 to 0.05 part of mannitol and 10 to 90 parts of water. Dental restoration mouthwash comprises the dental restoration mouthwash powder. The dental restoration mouthwash also comprises a mouthwash solvent, and the mouthwash solvent comprises the following raw materials in parts by weight: 2.0 to 3.0 parts of glycerinum, 0.05 to 0.1 part of sodium hyaluronate, 2.0 to 3.0 parts of xylitol, 0.05 to 0.1 part of menthol, an appropriate amount of a PH conditioning agent and 5 to 95 parts of water. The dental restoration mouthwash has the beneficial effects that the dental restoration mouthwash can maintain the activity of oligopeptide protein in the conditions of no anti-corrosion addition and drying besides the effects of traditional mouthwash for refreshing mouth odor and maintaining cleanness and sanitation of oral cavity, and is free of irritant hurt for pregnant women, children and oral inflammation patients; and the added oligopeptide protein ingredient can be directly absorbed by intraoral surface mucous membrane, so that the growth and division of intraoral mucous membrane epidermis cells are effectively promoted, and the effects of restoration and protection are achieved.

The invention relates to the technical field of medical instruments, in particular to an oral rehabilitation therapeutic apparatus. The oral rehabilitation therapeutic apparatus comprises an upper tooth socket, a lower tooth socket, a telescopic part, an elastic part and a locking mechanism, wherein an upper tooth socket is formed in one side of the upper tooth socket, and a lower tooth socket isformed in one side of the lower tooth socket; one end of the upper tooth socket and one end of the lower tooth socket are rotationally connected; the telescopic part is arranged between the upper tooth socket and the lower tooth socket, one end of the telescopic part is connected with the upper tooth socket, and the other end of the telescopic part is connected with the lower tooth socket; the elastic part is used for providing force for relative opening of the upper tooth socket and the lower tooth socket; and the locking mechanism is used for locking the telescopic part so as to position thetelescopic position of the telescopic part and unlocking the telescopic part so as to relieve telescopic limitation on the telescopic part. According to the scheme, the oral rehabilitation therapeutic apparatus can be used during radiotherapy and can also be used during rehabilitation training, when the radiotherapy and the rehabilitation training are switched for use, components do not need to be disassembled from or assembled on the oral rehabilitation therapeutic apparatus, and use is more convenient.

In accordance with the present situations that clinically, the tooth preparation operation of porcelain laminate veneers of anterior teeth is high in difficulty, and tooth tissue is easy to excessively strip to cause dental pulp sensitivity, the invention relates to an individualized tooth preparation substep indicating guide plate manufactured by digital design. The individualized tooth preparation substep indicating guide plate manufactured by digital design is characterized in that the guide plate is designed and manufactured by a digital method, and is used for performing accurate tooth preparation on the porcelain laminate veneers of the anterior teeth, so that accurate dental hard tissue stripping can be realized in a substep manner, and the purpose of being minimally invasive is achieved. The substep guide plate is used for indicating tooth preparation through the three steps of: in a first step, indicating preparation of a cutting end and a neighbor surface with a neighbor surface cutting guide plate; in a second step, indicating labial side preparation with a labial side guide plate; and a third step, indicating gum edge preparation with a gum edge guide plate. According to the individualized tooth preparation substep indicating guide plate manufactured by digital design disclosed by the invention, accurate design is performed by the digital method, and then the toothpreparation is guided in the substep manner, so that the problem that the preparation capacity is insufficient or excessive cannot be generated, the operation difficulty of a clinician can be reduced,the clinical repairing quality and patient satisfactoriness are improved, and the individualized tooth preparation substep indicating guide plate is a beneficial attempt of an idea of accurate medical care in the field of mouth rehabilitation.

The invention discloses an ultralow-shrinkage composite resin and a preparation method thereof. The ultralow-shrinkage composite resin is formed by compounding a resin matrix and inorganic filler. The resin matrix comprises a monomer system and an igniter system which are polymerizable. The inorganic filler comprises inorganic filler obtained after surface silylanization and calcium silicon-phosphate powder. Artificial bone cement-calcium silicon-phosphate are applied to a dental composite resin material, the calcium silicon-phosphate powder suffers from volume expansion after being subjected to a hydration reaction, compensation for polymerization volume shrinkage of the composite resin can be effectively achieved, the volume stability of the composite resin can be improved, and meanwhile mechanical indexes of the composite resin can meet the requirements of clinical dental materials. In addition, the preparation process is simple, cost is low, and important popularization and application value is achieved. The calcium silicon-phosphate filler has wide application prospects in the field of mouth rehabilitation through the characteristics.

The invention relates to the technical field of medical instruments, in particular to a mouth rehabilitation tongue blocking device. Comprising a supporting seat, an angle adjusting assembly and a length adjusting assembly, the length adjusting assembly comprises a fixed tongue blocking plate, an adjusting seat, a telescopic tongue blocking plate and an adjusting telescopic rod, the fixed tongue blocking plate is rotationally connected with the supporting seat through the angle adjusting assembly, the fixed tongue blocking plate is provided with an adjusting groove, and the adjusting seat is slidably connected with the fixed tongue blocking plate and located in the adjusting groove; the telescopic tongue blocking plate is fixedly connected with the adjusting base, the adjusting telescopic rod is arranged on the fixed tongue blocking plate and fixedly connected with the adjusting base, and the adjusting telescopic rod is controlled to stretch out and draw back transversely, so that the adjusting base slides in the adjusting groove, the telescopic tongue blocking plate is driven to move transversely, and the length of the telescopic tongue blocking plate stretching out of the fixed tongue blocking plate is further adjusted. Therefore, the length of the tongue blocking device can be adjusted according to the oral cavity of a patient, and the use effect of the tongue blocking device is good.

The invention provides a mouth rehabilitation metal dowel pin removal device, and belongs to the field of mouth rehabilitation medical devices and instruments. The mouth rehabilitation metal dowel pin removal device includes a slider, a slide hammer, a parallel rod, a movable joint, a male piece, a female piece, nuts and a screw rod, wherein one end of the slider is fixedly connected with the slide hammer, the slider and the slide hammer form an impact device, the other end of the slider is movably connected with the parallel rod, the tail end of the slider passes through the parallel rod, the tail end of the slider is mounted with the nut, the male piece is connected with the parallel rod through the movable joint, one end of the female piece is movably sleeved on the thread of a screw rod, the other end of the female piece is movably connected with the male piece in a cross manner, the male piece and the female piece form a clamping mechanism, one end of the screw rod is fixedly connected with the parallel rod, the other end of the screw rod is provided with the nut, and the parallel rod, the nut and the screw rod constitute a force-applying device. The removal device is simple in structure, convenient to operate, low in cost, and suitable for dental clinical application. The removal device has good market prospects and facilitates good application in the field of medical devices.

The invention discloses a tongue blocking device for dental restoration, which belongs to the technical field of dentistry and comprises a left clamping plate and a right clamping plate, a left connecting plate is fixedly connected to the front side of the left clamping plate, a right connecting plate is fixedly connected to the front side of the right clamping plate, a left outer plate is fixedly connected to the front side of the left connecting plate, and a left sleeve and a right sleeve are fixedly connected to the upper and lower parts of the left clamping plate and the right clamping plate respectively; through the arrangement of a left threaded rod, a right threaded rod and a connecting sleeve, the distance between the connecting position of a left clamping plate and a right clamping plate is conveniently adjusted and limited, and therefore limiting expansion can be conveniently conducted on the interior of the oral cavity according to the opening size of the oral cavity of a user, the left clamping plate is connected with a left outer plate through a left connecting plate, and the right clamping plate is connected with a right outer plate through a right connecting plate; the lip of a patient is conveniently limited left and right through the left connecting plate and the right connecting plate, and then the left outer plate and the right outer plate are clamped on the outer side of the oral cavity, so that the positions of the left clamping plate and the right clamping plate in the oral cavity are limited, and the stability of limiting and expanding the oral cavity is improved.