314 results about "Tooth enamel" patented technology

The invention discloses a SnO2 / SnS2 / AgS nano material with piezoelectric electro-catalytic tooth whitening and sterilizing performance and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dripping a silver nitrate aqueous solution into a prepared SnO2 / SnS2 nano material aqueous dispersion, carrying out hydro-thermal treatment for 2 hours, centrifuging, washing and drying to obtain a SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nano material; (2) food indigo is adopted to simulate tooth surface pigments, piezoelectric electro-catalytic degradation is carried out by using the SnO2 / SnS2 / Ag2S ternary semiconductor heterojunction nanomaterial, and the pigment degradation efficiency can reach 95% or above; (3) the SnO2 / SnS2 / Ag2S heterojunction nanomaterial is used for piezoelectric electro-catalysis treatment of the streptococcus mutans pellicle, and the antibacterial rate of the pellicle can reach 90% or above; and (4) compared with a 3% H2O2 aqueous solution for treating the enamel surface structure, the SnO2 / SnS2 / Ag2S nano-material piezoelectric electro-catalysis treatment of teeth has small damage to the enamel surface structure. According to the invention, more nano materials with tooth whitening and sterilizing performance and the preparation method thereof are provided, so that the problems of single variety, single preparation method, low electron-hole separation efficiency and large side effect of the existing tooth whitening and sterilizing nano materials are solved.

The invention discloses a data processing method and system for a dental three-dimensional model, and relates to the technical field of dental three-dimensional modeling, and the method comprises the steps: obtaining initial data of oral cavity scanning, recognizing a tooth type in the initial data, and determining a corresponding tooth surface reflection parameter according to the tooth type; generating scanning parameter combinations for different tooth positions according to the tooth surface reflection parameters and the tooth anatomical structure; tooth point cloud data are collected, and a tooth enamel reflective area and a shadow shielding area are identified; performing light reflection removal processing on the enamel light reflection area, performing data completion on the shadow shielding area, and generating corrected tooth point cloud data; and performing registration fusion on the corrected tooth point cloud data to generate a dental three-dimensional model containing a complete dentition. According to the method, the problem of data missing caused by enamel light reflection and adjacent tooth shielding is solved through a differential scanning strategy and regional data processing aiming at specific optical characteristics of teeth, and automatic construction of a high-quality dental three-dimensional model is realized.

The invention provides an antibacterial synergy-mineralization regulation difunctional nano material as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. The preparation method comprises the following steps: mixing a disodium hydrogen phosphate solution and a calcium chloride solution to obtain an amorphous calcium phosphate suspension; mixing the amorphous calcium phosphate suspension with a tannic acid solution to obtain an ACP-TA suspension; and finally, mixing the ACP (at) TA suspension and the hydroxypropyl trimethyl ammonium chloride chitosan solution to obtain the bifunctional nano material. A cross-linked shell is formed through the electrostatic adsorption effect of tannic acid and hydroxypropyl trimethyl ammonium chloride chitosan of the antibacterial layer, amorphous calcium phosphate is effectively wrapped, the crystallization process of amorphous calcium phosphate can be remarkably delayed, long-acting release of calcium and phosphorus ions is ensured, the antibacterial function can be effectively achieved, and the service life of the coating is prolonged. An ideal local microenvironment is provided for remineralization of tooth hard tissue, and finally biomimetic mineralization of enamel and deep mineralization plugging of dentinal tubules are achieved.

The invention discloses SGNH family esterase SH2 screened in a Tibetan hot spring environment and application of the SGNH family esterase SH2, and belongs to the technical field of gene engineering. According to the invention, a new SGNH family esterase gene is screened from a Tibetan hot spring environment, and recombinant expression is realized in escherichia coli. The recombinant esterase prepared by the invention has the characteristics of thermal stability, salt resistance, organic solvent resistance and the like, can be safely applied to tooth whitening or skin exfoliating products, avoids damage of traditional chemical bleaching agents to enamel, and has important application value in the fields of daily chemicals, medicines, food processing and the like.

The provided is a biomineralization material for treating dentin hypersensitivity and promoting epitaxial growth of enamel and a use thereof. The biomineralization material includes following raw materials in parts by weight: 5-72 parts of a film-forming protein or a PEGylated film-forming protein, 4-67 parts of a water-soluble disulfide bond exchanger and 1-21 parts of a pH regulator. The present application proposes for the first time that the disulfide bond exchanger (e.g., cysteine (Cys)) without any toxicity may react with the film-forming protein or PEGylated film-forming protein. When a protein nano-coating with a mineralization regulating function is formed, no large number of macromolecular protein aggregates can be generated to block the dentin pores. The biomineralization material can permeate deeply into the exposed dentin pores, with the depth of 200-500 μm (the sealing depth of the protein coating reacting with TCEP is only about 40 μm).

The invention provides an enamel veneering repair material and a preparation method thereof, and belongs to the technical field of ceramic forming products. In order to further improve the attaching property of a tooth veneering material, reduce the amount of abraded tooth tissues and reduce the risks of ceramic collapse and falling off. Zirconium oxide, aluminum oxide, hydroxyapatite, silica dimethylsilylate, silicon dioxide, fluorapatite, magnesium oxide, thermosetting acrylic resin, aluminum hydroxide gel, a silane coupling agent, polyvinyl alcohol, sodium phytate and the like are adopted as raw materials, all the components are matched according to a certain proportion, and a special technology is adopted for preparing the tooth patch. While good biocompatibility, high hardness and wear resistance are ensured, the adhesion can be further improved, the removal amount of tooth tissues by grinding is reduced, the risks of ceramic collapse and falling are reduced, the service life is prolonged, and better use experience is provided.

The invention relates to the technical field of dental restoration, in particular to a tannic acid-based enamel restoration material as well as a preparation method and application thereof, and the preparation method comprises the following steps: step 1, adding water into tannic acid TA to prepare a TA solution with the concentration of 7.5-15mg / mL; 2, preparing a ferric chloride solution, mixing the ferric chloride solution with a TA solution, and carrying out ultrasonic oscillation treatment; 3, alkali liquor is added into the solution obtained after ultrasonic oscillation treatment in the step 2 to adjust the pH to 5.8-6.2, and a TF solution is obtained; 4, preparing a calcium chloride solution, and mixing the calcium chloride solution with the TF solution obtained in the step 3 to obtain a mixed solution A; and 5, preparing a phosphate solution, and mixing the phosphate solution with the mixed solution A to form the enamel repair material TFA solution. According to the invention, the regeneration and repair capability of tooth enamel can be effectively improved, the tooth enamel is remineralized, the progress of early caries is prevented, and an innovative solution is provided for the field of oral health.

The invention relates to whitening and stain-removing toothpaste and a preparation method thereof, and belongs to the technical field of oral care. The toothpaste contains 1.5-2.5 parts of plant zymolyte, 15-25 parts of composite abrasive and the like, and the plant zymolyte is obtained by grinding walnut shell powder, beech, oyster shell and Manny root ice river mud into powder according to the mass ratio of 3: 3: 2: 1 and mixing the powder with compound enzyme liquid for enzymolysis; the composite friction agent and the chelating agent are respectively prepared by mixing substances with specific particle sizes / molecular weights according to a ratio, and also contain a film-forming agent, an enamel repairing component and the like. The preparation method comprises the following steps: preparing plant zymolyte; preparing a mixed solution; and subsequently stirring, degassing and filling. Through cooperation of multiple components, the toothpaste achieves efficient whitening, stain removal and bacteriostasis, has the effects of long-acting stain prevention, enamel repair and oxidation resistance, and solves the problems that traditional toothpaste is not thorough in stain removal, damages enamel and the like.

The invention relates to a composition with functions of protecting gingiva and repairing enamel and a preparation method of the composition, and belongs to the technical field of oral care. The composition contains a functional additive, a plant compound fermentation extract and the like, the functional additive is a mixture of corn starch, calcium phosphosilicate, hydroxyapatite, ubiquinone, sodium guaiazulene sulfonate, menthol and vitamin E, and the plant compound fermentation extract is obtained by fermenting and purifying honeysuckle flowers, radix polygonati officinalis and dandelions according to a specific proportion. Through the synergistic effect of the fermentation extract and the functional components, the problems that an existing toothpaste body is hardened, the storage stability is poor, the gingival protecting effect is short, and the enamel repairing persistence is insufficient are solved, the gingival protecting effect can be enhanced, the enamel repairing effect can be improved, the stability of the toothpaste body can be optimized, the antibacterial property and the oral mucosa relieving effect are achieved, and the oral cavity repairing effect is achieved. And the preparation process is scientific and reasonable, and is suitable for daily oral care.

The invention is applicable to the technical field of toothpaste preparation, and particularly relates to mild stain-removing and whitening toothpaste containing diatomite and coconut shell carbon and a preparation method of the mild stain-removing and whitening toothpaste. The mild stain-removing and whitening toothpaste comprises 9-30% of Changbai Mountain diatomite abrasive, 32-38% of sorbitol, 2-4% of sodium lauroyl silicate, 2-3% of polyethylene glycol 400 and 0.5-2% of coconut shell carbon. The toothpaste is prepared from the following components in percentage by weight: 0.6 to 1 percent of polyvinylpyrrolidone, 0.5 to 0.8 percent of honeysuckle flower extract, 0.5 to 0.7 percent of pseudo-ginseng extract, 0.5 to 0.8 percent of xanthan gum, 0.1 to 0.2 percent of 1, 2-hexanediol, 0.5 to 0.8 percent of essence and water. The diatomite and coconut shell carbon used in the invention are refined natural food-grade raw materials, do not contain chemical components, have low hardness, are suitable for children and sensitive people, and do not damage enamel; the selected Changbai Mountain diatomite and coconut shell carbon with the iodine value of 1500-3000 have a synergistic effect, and the Chinese herbal medicine extract is added to assist in degerming; the adsorption, whitening and deodorizing capabilities of the toothpaste are greatly improved, and the toothpaste can quickly remove stains, whiten and remove bad breath.

The invention provides an oral ceramic restoration optical prediction matching method and system based on deep learning, relates to the technical field of oral medicine, and solves the limitation problems that existing oral restoration is low in clinical colorimetric accuracy, depends on artificial experience, has medical technology communication information deviation and the like. The method comprises the following steps: acquiring spectral data of natural teeth, dentin, enamel and different types of ceramics, and calibrating the semi-permeability of enamel and ceramic samples by using an extinction coefficient; obtaining a ceramic-dentin complex and composite spectrum data thereof, constructing a multi-layer sensor model and completing training; and splicing the dentin spectral data and the ceramic spectral data into an initial input vector, splicing the initial input vector with the calibrated semi-permeable constraint vector, and inputting the spliced initial input vector into a multi-layer sensor model to obtain a model matching result. The intelligent model for automatically generating the natural tooth defect repair scheme is established based on the deep learning technology, the intelligent repair design and the visual repair effect are achieved, and clinical application is effectively guided.

The invention discloses a tooth instance segmentation method and device based on anatomic form priori, and belongs to the field of computer vision and artificial intelligence. According to the method, model training is carried out on a CBCT image, a real segmentation mask is processed into a three-classification segmentation mask with enamel as a boundary, the three-classification segmentation mask serves as a supervision signal, a network can directly output a prediction segmentation mask containing tooth boundary information in a reasoning stage, and a detection frame is generated accordingly. And after the detection frame is scaled according to the same proportionality coefficient and projected back to the original image, cutting each tooth to obtain a CBCT image of the single tooth. A loss function based on anatomical morphological prior is introduced into segmentation training of a single tooth CBCT image, and a network is constrained through a self-adaptively extracted morphological skeleton, so that a prediction segmentation mask is kept continuous at a root tip part, and the problem of tooth root segmentation fracture is effectively relieved. According to the method, accurate positioning and high-quality segmentation of the tooth instances are realized, so that the segmentation of the tooth instances in the full-mouth CBCT image is quicker and more accurate.

The invention relates to a light-cured dental resin adhesive containing a silane coupling agent modified monomer as well as preparation and application of the light-cured dental resin adhesive. The dental resin adhesive comprises a resin matrix, an organic polymer and a photoinitiator, wherein the resin matrix consists of methacrylate resin grafted and modified by a silane coupling agent and unmodified methacrylate resin. According to the method, the isocyano group of the silane coupling agent is selected to react with the hydroxyl group on the resin monomer to generate the silane modified grafted resin monomer, and the method is simple, low in equipment requirement and suitable for large-scale production; the obtained dental resin adhesive can be internally covalently cross-linked to enhance the self mechanical property, can also be chemically bonded with a bonding substrate by utilizing a grafted silane coupling agent to improve the interface bonding strength, is especially suitable for being used as an enamel bonding material, and can remarkably improve the service life and the curative effect of a bonded restoration.

Peptides that bind with high affinity to oral cavity surfaces, such as tooth enamel, have been discovered. The peptides exhibit antibacterial and mineralizing abilities, and are useful in many aspects of oral care. The peptides include the amino acid sequence AKRHHGYKRKFH-SpSp. The peptides can be included in oral care compositions such as toothpastes and mouthwashes. The oral care compositions can be used in methods to treat or prevent diseases or conditions induced by acidophilic oral bacteria. Exemplary methods include reducing or preventing tooth decay or demineralization, biofilm or dental plaque formation, and / or bacterial adhesion to a tooth surface; and promoting mineralization of teeth surfaces.

The embodiment of the invention provides an invisible appliance for treating periodontal disease and preventing enamel demineralization and a preparation method of the invisible appliance. The invisible appliance comprises a tooth socket, a quaternary ammonium salt antibacterial agent, a remineralizing agent coating and a waterborne polyurethane protruding point-shaped coating capable of releasing periodontal drugs, wherein the periodontal drug is a PDE4 receptor inhibitor.

The invention discloses a tooth wear evaluation model for evaluating the safety of oral products and a preparation method and application thereof. The tooth wear evaluation model is at least obtained by grinding and polishing the surface of a tooth model, and the tooth model comprises at least one of an animal enamel block model, an animal dentin block model, a tooth-like material dental film model, a full-mouth animal enamel model and a tooth-like material full-mouth tooth model. According to the tooth wear evaluation model, the wear performance of the oral product can be conveniently tested in vitro.

The invention provides a tooth patch for repairing tooth hardness and a preparation method thereof, the tooth patch comprises a support material and gel, and the gel comprises the following components by mass: 1.5-2 parts of regenerated silicon, 0.5-0.7 part of A200, 1.5-2.5 parts of a thickener, 15-20 parts of a film-forming agent, 4-6 parts of a humectant, and 1-1.5 parts of a gelling agent. The tooth paste can form a hydroxyapatite layer on the tooth surface, repair tooth enamel, promote remineralization of the tooth surface and improve tooth hardness, is alkalescent, and can prevent dental caries; after contacting with saliva, hydroxyapatite crystals can be quickly formed in dentinal tubules to block the dentinal tubules, and the hydrogel can be used for treating tooth sensitivity.

The present invention relates to diagnostic intraoral scanning and tracking. The present invention relates to methods and apparatus for acquiring, using, and displaying a three-dimensional (3D) volume model of a patient's dental arch. The 3D volume model may include surface information (e.g., color) as well as information about internal structures (e.g., near-infrared (Near-IR) transparency values ​​of internal structures including enamel and dentin).

The present invention discloses a biomimetic enamel composite material, which is a composite of ceramic hydroxyapatite nanowires and a polymer organic polymer assembled in an oriented manner; the biomimetic enamel composite material has a multi-level, multi-scale, and multi-component overall orientation structure; the hardness of the biomimetic enamel composite material is 2.5 - 5.5 GPa, the modulus is 40 - 60 GPa, the viscoelastic loss factor is tanδ = 0.03 - 0.04, and the viscoelastic quality factor is 1.5 - 2.5. The biomimetic enamel composite material is used as an upper restoration material for oral medical implants and is used for the integrated preparation of oral implant abutments and crowns. The present invention also discloses a preparation method of the biomimetic enamel composite material. The present invention has broad application prospects in clinical dental crowns, upper healing abutments of oral implants, repair abutments, and abutment integrated crowns in oral medicine.

The invention discloses an anti-decayed tooth toothpaste containing sugarcane leaf polysaccharide and a preparation method thereof. The toothpaste is prepared from the following raw materials in parts by weight: 3-6 parts of sugarcane leaf polysaccharide, 0.5-0.8 part of propolis extract, 0.05-0.09 part of antibacterial peptide, 2-5 parts of green tea extract, 80-100 parts of auxiliaries, 5-10 parts of deionized water and 2-4 parts of natural tea tree oil. The preparation method comprises the following steps: uniformly mixing all the raw materials, heating and stirring, and carrying out vacuum degassing to prepare the paste. The toothpaste disclosed by the invention can be used for efficiently inhibiting / killing oral pathogenic bacteria, maintaining the micro-ecological steady state of oral health and reducing erosion of acid substances to enamel, has excellent effects in the aspects of protecting gingiva, resisting inflammation, preventing bacterial breeding and resisting decayed teeth, and keeps lasting efficacy.

The invention relates to an enamel repair material and a preparation method thereof, and belongs to the technical field of medical filling materials for tooth defects, the enamel repair material comprises F-HAp, APTES-ZrO2, MPC modified composite resin, 10-MDP, gamma-MPS, a composite initiator, MPC and a dispersant; f-HAp is a fluorine-doped enamel-like hydroxyapatite nanorod, and F-HAp is a fluorine-doped enamel The APTES-ZrO2 is nano zirconium oxide modified by aminopropyl triethoxy silane, and the nano zirconium oxide modified by the aminopropyl triethoxy silane is The MPC modified composite resin is 2-methacryloyloxyethyl phosphorylcholine grafted and modified dimethyl acrylic acid carbamate and glycidyl methacrylate elastomer composite resin; the F-HAp, APTES-ZrO2 and MPC modified composite resin is prepared by adopting a special method, and is compounded with other components according to a certain proportion to obtain the enamel repair material, so that the enamel repair material has good cohesiveness, strength and biocompatibility and excellent leakage resistance, and the use safety and durability are improved.

The invention discloses a preparation method and application of polyethylene glycol functionalized nano capsule-like gel. The preparation method comprises the following steps: (1) extracting a nano capsule-like body; (2) preparing polyethylene glycol functionalized nano capsule-like gel; and (3) applying the polyethylene glycol functionalized nano capsule-like gel to mediating photodynamic tooth bleaching. The polyethylene glycol functionalized nano capsule-like gel is combined with a photodynamic reaction to interfere with an electron transport chain and promote ROS accumulation, and the nano capsule-like gel with a specific photoreaction oxidation function is constructed, so that the nano capsule-like gel can be used for equivalently bleaching teeth with a traditional bleaching agent, and meanwhile, the activity of the nano capsule-like gel is improved. The sensitive risk to tooth essence and the mechanical injury risk to enamel and cementum are remarkably reduced, and the composition can be applied to home care or clinical whitening treatment; and the preparation method is simple, is convenient to use, is mild and non-irritant, is high in biocompatibility, and has a good market application prospect.

The invention belongs to the field of dental restoration digitalization, and particularly relates to an anterior tooth layered resin filling restoration method based on the guidance of a digital guide plate. Comprising the following steps: S1, obtaining a three-dimensional digital model of an abutment tooth preparation body; s2, generating a digital model of the dentin form of the defect part layer by layer by using oral cavity computer-aided design software; s3, completing the design of the enamel layer form on the digital model of the dentin form of the last layer of tooth defect part; s4, cover shell type guide plates covering adjacent teeth of the defective teeth are designed, and the cover shell type guide plates are numbered; s5, performing 3D printing on each layer of model and the guide plate, and checking the in-place condition of the guide plate; and S6, filling corresponding dentin resin and enamel resin in each stage of guide plate, resetting the guide plate filled with the resin to the oral dentition, and completing layered resin filling through illumination curing. According to the method, the process is optimized, the operation is simplified, and the operation precision is ensured by fully utilizing the advantages of the digital technology.

The invention provides tooth enamel repairing toothpaste and a preparation method thereof, and the tooth enamel repairing toothpaste comprises the following components in percentage by mass: 15-30% of glycerol, 15-30% of glycerol, 5-10% of sodium dodecyl sulfate, 5-10% of sodium dodecyl sulfate, 5-10% of sodium dodecyl sulfate and the balance of deionized water. 10%-25% of hydrated silica; 3%-10% of polyethylene glycol-8; 3%-7% of calcium phosphosilicate; 1%-5% of a surfactant; 0.5%-3% of a binder; 0.05%-0.5% of an antibacterial agent; 0.1%-1.5% of a compound enzyme; the compound enzyme comprises lysozyme, papain and bromelain; the mass ratio of the lysozyme to the papain to the bromelain is 1: (0.4-0.6): (0.4-0.6); and the balance of water. The toothpaste can be used for remarkably improving the repairing effect of enamel and the oral health maintenance capability.

The invention discloses a standardized three-dimensional periodontal attachment quantification system and method, and relates to the technical field of digital oral medicine, and the method comprises the following steps: calibrating a cementum-enamel boundary, dividing a tooth model into a dental crown and a tooth root, and determining the total surface area of the tooth root; performing sensitivity analysis by using the candidate threshold sequence, and determining an optimal diagnosis threshold in combination with a surface integrity criterion; based on the optimal diagnostic threshold, an absolute adhesion area and a relative adhesion area ratio are calculated and output. The invention provides a quantitative method capable of truly, comprehensively and accurately reflecting the three-dimensional pathological change of the periodontal tissue, and the accuracy of a measurement result is ensured through standardized crown root segmentation and accurate geometric judgment; through data-driven parameter optimization, uncertainty caused by manual intervention is eradicated, and objectivity and repeatability of a measurement result are ensured.

The invention discloses application of fermented lactobacillus mucus in preparation of a product for improving tooth color and gingivitis, and relates to the technical field of microorganisms. The lactobacillus fermentum NHNK-623 disclosed by the invention is preserved in the China Center for Type Culture Collection on November 18, 2024, and the preservation number of the lactobacillus fermentum NHNK-623 is CCTCC (China Center for Type Culture Collection) NO: M 20242574. The NHNK-623 has the effects of inhibiting proliferation and biofilm formation of pigment-generating pathogenic bacteria, agglutinating the pigment-generating pathogenic bacteria, inhibiting melanin generation of the pigment-generating pathogenic bacteria, inhibiting hyaluronidase activity of the pathogenic bacteria, promoting growth of gingival fibroblasts, inhibiting gingival cell inflammation and apoptosis induced by the pigment-generating pathogenic bacteria, and inhibiting melanin generation of the pigment-generating pathogenic bacteria. And the product can be used for preparing products for improving tooth color and gingivitis.

The invention discloses a core-shell structure piezoelectric nano-enzyme material and application thereof in oral care, which can generate active oxygen through piezoelectric effect under the action of mechanical stress to realize double effects of tooth whitening and antibiosis. The technology does not need external source energy input, avoids dependence of traditional photocatalysis and chemical bleaching technologies, and is simple and convenient to operate, green and safe. Through in-situ generation of cerium oxide on the surface, the material has dual enzyme activity, effectively balances the antibacterial effect and biological safety, and prevents excessive damage to enamel. In addition, the stability and catalytic efficiency of the material are remarkably improved in a complex oral environment, and the problem of failure of a traditional material is avoided. The technology can be widely applied to oral care products such as toothpaste, mouth wash and antibacterial gel, has remarkable industrialization potential and can bring innovation to the global oral care market.

The invention provides an in-vitro orthodontic force testing tool and a force applying method based on enamel crack characteristics, and the tool comprises a die body which comprises a bionic gingiva, experimental teeth and a connecting piece; the rotary fixing mechanism comprises a rotary table, an assembly table and a clamping piece, the rotary table can rotate by a preset angle, a mounting groove is formed in the assembly table, the die body is arranged in the mounting groove, and the clamping piece clamps the bionic gingiva; the traction mechanism is connected with a traction line, and the traction line can move or rotate along a straight line. Different acting forces are given to the die body through the interaction of the rotating mechanism and the traction mechanism, so that the orthodontic force capable of avoiding tooth injury is tested. The device not only can be used for respectively adjusting tension, pressure, lateral traction force, rotary traction force and torque force, but also can be used for simulating the composite action of various forces, so that the test result is highly matched with the actual orthodontic process. The system has the advantages of rich functions, high simulation degree, accurate test result, wide application range and the like.

A method for determining a dental condition comprising: receiving at least one volumetric image and at least one intra-oral surface scan image of a dental structure of a patient, wherein the dental structure includes at least one of a crown, root, gingiva or bone; aligning the at least one volumetric image with the at least one intra-oral surface scan image; identifying boundaries of the gingiva and the bone within the aligned images; and calculating distances between the identified boundary of the gingiva and cementoenamel junction (CEJ), the identified boundary of the bone and the CEJ, and the identified boundary of the gingiva and the identified boundary of the bone to determine the dental condition.

The invention relates to the field of stomatology, in particular to a combined layered seal guide plate which comprises a base guide plate, a dentin layer seal guide plate and an enamel layer seal guide plate, a guide bearing piece is arranged in a preset area of the base guide plate, and a first moving piece is arranged on the outer surface of the dentin layer seal guide plate; a second moving part is arranged on the outer surface of the enamel layer seal guide plate; the dentin layer seal guide plate and the enamel layer seal guide plate are sequentially matched with the guide bearing part in the use process; according to the invention, the unified bearing guide piece is arranged on the substrate guide plate, and the subsequent dentin layer seal guide plate and enamel layer seal guide plate are guided and positioned by using the same bearing guide piece, so that the problem of inaccurate positioning between layers possibly caused by lack of common positioning reference of the traditional independent layered guide plate is effectively solved; therefore, the in-place accuracy and consistency of the seal guide plates of all the repairing layers in the repairing process are improved.