123 results about "Natural tooth" patented technology

The invention relates to a zirconia-based all-ceramic false tooth and a preparation method thereof. A core layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 90 to 94 parts of ZrO2, 5 to 9 parts of Y2O3, 0.1 to 0.5 part of Al2O3, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2, and a shell layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 24.5 to 49.5 parts of CaCO3, 45 to 50 parts of SiO2, 0 to 25 parts of MgO, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2. The preparation process comprises the following steps: performing dry pressing and isostatic pressing on raw materials of the core layer, presintering, and carving to obtain a zirconia-based false tooth biscuit; meanwhile, calcining raw materials of a shell layer, then adding deionized water, a dispersing agent and an adhesive, and carrying out ball milling and mixing to obtain calcium-magnesium-silicon-based ceramic slurry; and coating the calcium-magnesium-silicon-based ceramic slurry on the surface of the zirconium oxide-based false tooth biscuit, and sintering to obtain the zirconium oxide-based all-ceramic false tooth provided by the invention. The zirconia-based all-ceramic false tooth has good jade texture and is closer to the natural color of natural teeth.

The invention relates to the technical field of dental implants in oral medicine, in particular to an optimal design of a geometric structure of a dental implant. According to the technical scheme, the method comprises the following steps: firstly, specifying cross section general forms of three types of implants, then, creating a natural tooth model based on multiple groups of head image data, counting the value range of the curvature radius of each type of natural teeth based on the natural tooth model, and obtaining the feature size of the implant and the corresponding optimal curvature radius thereof; according to the dental implant simulating the natural tooth root curvature and the design and implantation system thereof, the morphological characteristics of natural teeth are fully considered, the specific shape of the cross section of the upper end face of each type of implant under each feature size is determined, and finally the dental implant model is created based on the results. The oral cavity biomechanical requirement and the functional adaptability of the human body oral cavity can be better met, meanwhile, large-scale production can be achieved, and the requirement of large-scale clinical application can be met.

The invention relates to the technical field of color correction, in particular to a baked porcelain false tooth color adjusting method and system based on image analysis, and the method comprises the following steps: identifying teeth, gingiva and surrounding tissues in an image, determining a region boundary by using an edge detection technology, and calibrating a region according to gray difference. According to the method, teeth and surrounding tissues are accurately segmented by using an edge detection technology, accurate identification of a tooth area in an image is realized, a clear starting point is provided for color adjustment, a wave band with high reflectivity is selected, the quality of image data is optimized, the precision of subsequent color analysis is ensured, and hue, brightness and saturation are adjusted in a CIELAB color space; the matching degree of denture colors and natural teeth is improved, the visual coherence is enhanced, neural network analysis and time sequence data are integrated to predict long-term color changes, a real-time feedback mechanism automatically adjusts color parameters according to illumination conditions, the visual effect is continuously optimized, and the naturalness and consistency of colors in different environments are guaranteed.

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 relates to an artificial intelligence technology-based digital form false tooth restoration generation method, which comprises the following steps of: performing 3D scanning on the oral cavity of a patient to obtain a three-dimensional digital impression of upper and lower jaw teeth, appointing the position of a preparation body, performing local cutting by taking the preparation body as a center, and obtaining a three-dimensional digital impression of the upper and lower jaw teeth; the cut area comprises a preparation body, adjacent teeth and three-dimensional impression information of jaw teeth; inputting the cut impression information into a deep neural network model to generate a restoration digital form matched with the preparation body; in the model training process, impression information of a cut part is used as model input, and a three-dimensional digital form of a repaired false tooth prosthesis is used as a learning target; and measuring the difference between the output of the network model and impression information by defining an energy function. Compared with the prior art, the method has the advantages that the digital denture prosthesis with highly accurate model natural tooth morphological characteristics can be designed and produced, and the efficiency and the accuracy are improved.

A method for manufacturing a splint or surgical guide for the implantation of at least one dental implant, relating to a part of a guided oral surgery process by which at least one implant is placed or implanted in a patient's jaw to replace the function of one or more natural teeth. The manufacturing method is implemented by a computer program. The object is to improve the implant placement process in an optimal and minimally invasive, as well as more simplified way.

There is provided a layered body that has gradations in translucency and color allowing the layered body to give an impression similar to that of natural teeth and with which the chipping of the surface layer (layer closer to the incisal edge of the dental restoration) can be reduced.The layered body comprises a surface layer containing zirconia containing at least one stabilizing element and a composition-gradient layer composed of two or more unit layers. The unit layers each contain at least one coloring element and zirconia containing at least one stabilizing element, and the composition-gradient layer is constructed as a result of the unit layers being stacked in such a manner that the amount of the stabilizing element in the zirconia containing at least one stabilizing element contained in the composition-gradient layer remains unchanged or decreases from the surface layer toward the surface of the layered body opposite the surface layer. The amount of the stabilizing element in the zirconia containing at least one stabilizing element contained in the surface layer is smaller than the amount of the stabilizing element in the zirconia containing at least one stabilizing element contained in a first composition-gradient layer, which is one of the unit layers constituting the composition-gradient layer and is adjacent to the surface layer.

The application discloses a Gothic arch retaining device for natural dentition and a manufacturing method of the device. The device comprises: a maxillary retaining splint comprising an inner side and an outer side formed around the maxillary natural dentition, the maxillary retaining splint further comprising a plurality of retaining connecting parts extended from the inner side and located in the same horizontal plane; a mandibular retaining splint comprising an inner side and an outer side formed around the mandibular natural dentition, the mandibular retaining splint further comprising a plurality of retaining connecting parts extended from the inner side and located in the same horizontal plane; a maxillary Gothic arch having a plurality of retaining pins for connecting with the plurality of retaining connecting parts of the maxillary retaining splint to determine the position of the maxillary Gothic arch; and a mandibular Gothic arch having a plurality of retaining pins for connecting with the plurality of retaining connecting parts of the mandibular retaining splint to determine the position of the mandibular Gothic arch. The Gothic arch can be installed, fixed and used on the natural dentition.

The invention discloses a visual bionic dental pulp chip based on a microfluidic device, and a preparation method and application thereof, and belongs to the technical field of biomedicine. The visual bionic dental pulp chip comprises a micro-fluidic chip and a 3D cell reaction unit arranged on the micro-fluidic chip, a perfusion channel, a tube cavity and a liquid storage tank are arranged on the micro-fluidic chip; the 3D cell reaction unit comprises a light-cured gel coating which is coated at the bottom of the liquid storage tank and carries dentin matrix particles, and a bionic dental pulp tissue arranged on the surface of the gel coating. The invention discloses a preparation method and application of the visual bionic dental pulp chip. Based on the principle of organ chips, the micro-fluidic device is introduced into the construction of the bionic dental pulp chip, and the ecological niche of natural dental pulp tissue is simulated in vitro to the greatest extent.

Disclosed are systems and methods for a computerized framework for automated ceramic inkjet printing in dental restoration manufacturing. The disclosed ceramic inkjet mesh printing for dental restorations combines precision digital control with ceramic materials to create highly accurate and aesthetically pleasing dental prosthetics. The disclosed mechanisms utilize specialized printheads designed to deposit precise amounts of ceramic materials onto dental substrates, enabling the creation of detailed color gradients and natural-looking surfaces that closely mimic natural teeth.

This invention discloses a modular denture with adjustable installation height, comprising an installation base with multiple installation cavities at the top and multiple positioning slots at the bottom; multiple dentures are movably fitted into their respective installation cavities, with their roots movable vertically within the cavities; and a lifting drive mechanism, embedded in each installation cavity, for independently driving the corresponding denture for height adjustment; the lifting drive mechanism includes: an adjusting shaft horizontally rotatable inside the installation base, one end of which extends out of the side wall of the installation base to form an operating end; and a driven shaft vertically rotatable within the installation cavity; when the adjusting shaft rotates, it drives the driven shaft and lead screw to rotate via a bevel gear transmission mechanism, causing the threaded slider and dentures to rise and fall vertically, thereby achieving denture height adjustment. This invention solves the problem that most existing dentures use a fixed connection with the base, making it difficult to adjust the height after installation and to personalize the adjustment according to the actual height of the patient's natural teeth.

The application discloses a crown-bridge prosthesis, which comprises a bridge body and two retention crowns, the bridge body is arranged between the two retention crowns, the top of each retention crown is provided with a retention groove, the front surface of each retention crown is provided with a positioning channel, the top of the positioning channel is throughly arranged, the positioning channel is communicated with the retention groove, an adapter is arranged in the retention groove, the front surface of the adapter is provided with a through hole, a center block is arranged in the through hole, the outer wall of the center block is provided with a clamping groove, the center block is movably clamped in the positioning channel, and a plurality of spring telescopic structures are uniformly arranged on the outer wall of the center block in a ring shape. The crown-bridge prosthesis is connected with abutments or implant abutments through the retention crowns. When a patient chews, the occlusal force is first applied to the bridge body, the force is transmitted to the center block of the adapter through the retention protrusions on the two sides of the bridge body, when the occlusal force is applied, the spring telescopic structures can absorb part of the force, reduce the impact on the natural teeth and the implant, disperse the stress, and avoid stress concentration.

The present application relates to the technical field of oral prosthetics, in particular to a porcelain dental prosthesis color prediction system, a construction method and a prediction method, comprising: a multi-modal image acquisition module for acquiring high-definition color images of natural teeth in the oral cavity, three-dimensional scanning images of tooth preparation surfaces and microstructure images of porcelain prosthesis substrates, and synchronously acquiring environmental light parameters; an image recognition processing module for processing original data, outputting natural tooth color space feature vectors, tooth preparation surface morphology parameters and porcelain layer substrate micro-pore distribution parameters; an intelligent color prediction module for constructing a deep learning model, combining an environmental light correction algorithm to predict the final presented color data of the prosthesis; a parameter output and optimization module for generating a color deviation report, outputting porcelain layer thickness adjustment suggestions and firing process parameter optimization schemes, and supporting visual display of the prediction effect. Thus, the problems of one-sided prediction dimension and subjective optimization in the prior art are solved.

Disclosed are systems and methods of a decision intelligence (DI)-based computerized framework that automatically and / or dynamically implements a color algorithm for performing staining and glazing dental restorations. The framework operates by leveraging determined color variations through AI / ML-based analysis that generate detailed color maps, which can be translated into precise printing instructions controlling the mixture and layering of dental-grade glazing materials. A printing system can employ multiple print heads with varying base colors and opacity levels to create microscopic color gradients and translucency effects matching natural tooth enamel. The disclosed automated processing applies personalized color patterns in microscopically thin layers, ensuring consistent glaze thickness while replicating regional variations across the tooth surface. Such approach eliminates manual glazing variability while achieving superior customization compared to traditional pre-set patterns, resulting in dental restorations that integrate seamlessly with existing teeth.

The invention belongs to the technical field of biomedical materials, and discloses a natural tooth composite material bone grafting scaffold for alveolar bone repair and a design and preparation method thereof. The method comprises the following steps: collecting orthodontic teeth, impacted teeth, multiple teeth, loose teeth and other natural teeth extracted in oral medical treatment, and performing technical treatment to obtain raw material powder; ball-milling and mixing the bioactive glass powder, the carbon-based material powder and the natural dental powder to obtain mixed powder; the mixed powder is used as a raw material, and the bone grafting scaffold is obtained through computer aided design and digital light processing technology 3D printing; and modifying the surface of the 3D printing bracket by using the polydopamine-carbon-based material composite coating to obtain the natural tooth composite material bone grafting bracket. The natural tooth composite material bone grafting scaffold obtained by the invention has good mechanical property, controllable degradation property and antibacterial property, and has good biocompatibility and osteogenesis efficiency.

The utility model discloses a prevent edge collapse porcelain metal porcelain tooth, related to metal porcelain tooth technical field, including metal tooth body and porcelain body, metal tooth body includes fixed part and movable part, and the fixed part is installed on the natural tooth, and the movable part is provided with the slot that is matched with movable part side wall shape on, and the flexible strip is fixedly connected between the edge part of fixed part and movable part, and the middle part of fixed part is inserted with the slot and is connected with the rubber pad between the groove fixedly, and the fixed part and the inner wall of groove are all smooth surface, and a plurality of weakening grooves are equidistantly seted up on the rubber pad. The utility model discloses a metal tooth body is set up as the fixed part of fixed natural tooth and the movable part that can be opposite fixed part movable, and the rubber pad of weakening groove is seted up between the both, and the pressure is transferred, when the tooth bites to the hard thing, the rubber pad will be deformed (be pressed flat), makes the porcelain body can get the buffer, has reduced the phenomenon that porcelain collapses when porcelain body suffers the hard thing obstruction suddenly.

Apparatus and processes by providing for gradually interleaving layers of zirconia powders having different concentrations of colorants and yttria to obtain color and translucency gradients that more closely mimic natural teeth, in which apparatus includes a comb having a multiplicity of tines that is extended vertically into a mold configured to hold at least two layers of differently constituted powders, such that adjacent layers of the powders form an interface. The comb is reciprocated to create a textured surface pattern on a topmost layer of powder and additionally may be used to penetrate an interface between adjacent layers, thereby redistributing the particles near the interface.

This image processing method is for displaying a dental plaque region on the basis of an image obtained by photographing teeth and dental plaque undergoing a fluorescence reaction as a result of being irradiated with light including a wavelength band of blue light, said method comprising: detecting a natural tooth region from the region of the teeth on the basis of the image (S201-S206); detecting plaque regions on the basis of the image (S207); and displaying a plaque region exclusively in the natural tooth region (S105). For example, the image processing method may involve, in detecting a natural tooth region, detecting a first region that is (i) a region, among all pixel regions of the image, having a luminance value equal to or greater than a predetermined first threshold or (ii) a region, among all pixel regions of the image, having a green pixel value equal to or greater than a predetermined second threshold, and detecting a natural tooth region on the basis of the first region.

The invention discloses a low-temperature preparation method of a biomimetic mineralized dental material, which comprises the following steps of: (1) adding a microorganism sporosarcina pasteurii capable of generating calcium carbonate into a microorganism fermentation liquid capable of generating protein fibers for co-culture to obtain a fibrous biofilm containing the sporosarcina pasteurii; (2) adding the biological membrane into a mineralizing solution for biological mineralization; and (3) after mineralization is finished, performing high-temperature sterilization and drying on the material to obtain the biomimetic mineralized dental material. By adopting an in-situ mineralization technology and combining microbial co-culture with a biomineralization assembly technology, the preparation of the super-hard and super-tough bionic ceramic dental material can be realized under the near room temperature condition of 30 DEG C, and the super-high energy consumption of a traditional high-temperature sintering technology is avoided; the Vickers hardness HV value of the dental material prepared by the method is about 300 and is close to that of natural enamel, and the tensile toughness value of the dental material is 18 MJ / m < 3 > and is 10 times of that of natural teeth.

The invention relates to glasses and glass ceramics having a high content of cerium and tin, comprising the following components: # imgabs0 # and which are particularly suitable for the production of dental prostheses having fluorescent properties substantially consistent with those of natural teeth.

1. The name of the design product: oral natural tooth color measurement colorimeter. 2. The use of the design product: for detecting tooth color. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention relates to a digital design method and device for a dental restoration and a storage medium. The method comprises the following steps: S1, respectively obtaining point clouds of enamel, dentin and dental pulp of a tooth to be restored and a reference tooth thereof by using a CBCT (Cone Beam Computed Tomography) image; s2, determining a tooth body center point of the reference tooth based on tooth enamel, dentin and tooth tip positions of dental pulp of the reference tooth, and determining a tooth body center point of the to-be-repaired tooth in combination with a first volume ratio of the reference tooth to the to-be-repaired tooth; s3, respectively making infinitely long cones by taking the central point of the tooth body as the vertex of the to-be-repaired tooth and the reference tooth to obtain volume coefficients of dentin and enamel of the reference tooth and the to-be-repaired tooth; and S4, gradually enlarging the vertex angle of the cone, and reconstructing enamel and dentin of the to-be-repaired tooth layer by layer. Compared with the prior art, the method has the advantages that the complex geometrical morphology and biomechanical characteristics of enamel and dentin are accurately simulated based on CBCT images, the weights of all levels are set, and bionic repair better conforming to natural teeth is achieved.

The application discloses a detachable digital guide plate for assisting fiber post and resin core repair and a manufacturing method. The detachable digital guide plate comprises a base guide plate and a post core guide plate assembled through a mortise and tenon joint structure. The guide plate is manufactured by using digital technology, fully considering the complexity and individual differences of the root canal morphology of natural teeth, and setting the post core position with the expected repair effect as the target, effectively assisting the accurate positioning and forming of the post core in the tooth defect repair, the fiber post bonding and the resin nucleation, especially suitable for the complex repair treatment of the multi-abutment row joint crown or fixed bridge. Not only can the guide plate assist the accurate positioning and bonding of the fiber post, but also can control the nucleation space position and shape of each post core, effectively assist the multi-abutment to obtain the common positioning channel, reduce the clinical operation difficulty, improve the operation accuracy and the quality of the oral repair treatment, and reduce the tooth preparation time of the clinician at the chair.

The invention relates to the technical field of dental implant detection, in particular to a dental implant abutment performance detection device which comprises a fixing frame, the fixing frame is in a U shape, a fixing rod is fixedly mounted in a U-shaped groove in the fixing frame, two positioning tables are arranged in the U-shaped groove in the fixing frame, mounting grooves are formed in the two positioning tables, and the mounting grooves are communicated with the fixing rod. A fixing shaft is fixedly mounted in the mounting groove in the positioning table close to the bottom end of the fixing frame, and a rotating shaft is rotationally mounted in the mounting groove in the positioning table at the top end of the fixing frame; when the driving gear is controlled to rotate, the teeth on the driving gear stir the lifting toothed plate to move upwards, at the moment, the mounting tank close to the top end of the fixing frame is pulled to move upwards, and after the teeth on the driving gear are separated from the lifting toothed plate, the mounting tank moves downwards and collides with the other mounting tank, so that the mounting tank is prevented from being damaged. Implanted teeth on the two installation tanks are made to collide with the natural tooth model, and occlusal collision in the chewing process is simulated.

The invention discloses a fixed clamp holder and a tooth neck subgingival defect repair auxiliary system, and belongs to the technical field of medical instruments, the fixed clamp holder comprises a handle and an operation head located at the end of the handle, the operation head is provided with an operation mechanism, the operation mechanism comprises a clamping part rotationally connected to the operation head and an adjusting part used for rotating the clamping part, and the clamping part is provided with a clamping groove. The clamping part comprises two clamping arms, and the included angle between the two clamping arms is adjustable. The bending degree of the forming piece can be changed by changing the opening angle of the two clamping arms, so that the forming piece is preformed, the shape of the forming face is easier to control, the forming face is more accurately attached to the radian of natural teeth, the two clamping arms can be integrally rotated through the adjusting part, the orientations of the two clamping arms are changed, and the repairing requirements of different orientations are met; and the adjacent surface contour recovery effect is ensured.

The invention relates to a natural tooth secondary immediate restoration system, which comprises a restoration method, a zirconium oxide restoration body and a digital processing technology thereof, belongs to the field of tooth restoration, and aims to solve the problems of periodontitis and aesthetics incoordination caused by long period and biological width invasion of traditional secondary restoration. According to the technical scheme, the method is characterized in that a symmetric bone margin curve is rapidly established through biological modification in an operation preparation stage and is perpendicular to a prepared tooth body, alveolar bone and gingiva data are obtained through digital scanning, and design, cutting, sintering and neck high polishing treatment (without decorative porcelain) of a zirconium oxide restoration are completed within 12 hours in a technician room. Immediate tooth wearing is realized by using a self-curing bonding material, and indexes are monitored in combination with postoperative reexamination; the dental implant is mainly used for immediate repair of natural teeth, remarkably shortens the treatment cycle, and reduces the chair-side time and the number of times of revival.

In a digital analysis of chewing, based on feedback principles and preferred optical marker position recognition, the interdependent movement patterns of maxillary and mandibular teeth are analyzed using bidirectional synchronization of tactile and motion image acquisition technologies, and their movements are recorded by a camera system. The camera system preferably integrates at least two systems, one on the right side of the mouth / face and the other on the left side, or one system is centered relative to the facial centerline. Each system has at least one (preferably three) camera, including at least one and preferably two monochrome or color cameras with a minimum resolution of 2.3 Mpx and a high frame rate of at least 1000 frames per second (FPS), equipped with dedicated optics / lenses, and at least one high-resolution and low-frame-rate color camera with a minimum resolution of 12 Mpx and a minimum frame rate of 25 FPS, capable of recording markers (M1) indirectly fixed by positioning patterns, or markers directly / independently (M2 – preferably using IPA technology) affixed to the veneer surface of the crown of the maxillary natural / artificial tooth, and markers independently affixed to the veneer surface of the crown of the natural / artificial tooth. Because of the connection between the camera and the trigger card, their operation is synchronized in time and is responsible for recording the position / movement of the upper crown with M1 and / or M2 markings relative to the lower crown with M1 and / or M2 markings, as well as the position / movement of the upper and lower crowns with M1 and / or M2 markings relative to the alveolar bone of the upper and lower jaws and the patient's face with M2 markings, the markings being affixed to facial feature anatomical points. This is all recorded synchronously in video film technology, and then the 3D scans of the upper and lower teeth with M1 and / or M2 markings are stitched into the video film, wherein the scans are obtained through intraoral or extraoral scanning technology. Furthermore, it can convert the repositioning of M1 and / or M2 markers. Movements during patient chewing assessment are recorded by a camera system, and the captured images are transcribed into a software environment. Digital acquisition of data from the M1 and / or M2 optical markers is submitted for further analysis in the software environment, enabling the conversion of these marker repositionings into the number of collisions between the upper and lower crowns, on which M1 and / or M2 markers are fixed. This is preferably read by a tactile device, preferably a tactile manipulator, to map / control the repositioning caused by these collisions via vibrations at a frequency between 1 and 4 kHz. The above arrangement enables the tracking of the amplitude of height changes in the collision angle, which is above / below 10 degrees between the upper and lower crown pairs with M1 and / or M2 markers, within a set time unit, divided into time intervals, preferably 0.001 seconds. Along the path of each movement phase / chewing cycle, the number of vibrations of the tactile manipulator during the set time unit represents the contact / collision moments of these crown pairs with M1 and / or M2 markers. The pattern on the crown of the natural / artificial tooth positioned on the implant consists of two separable components, including a prefabricated external component that extends out of the mouth and an internal component.The external component has at least three markings at its tip. The internal component is individually designed and customized to fit the veneer surface of the patient's tooth crowns. The digital chewing recorder, located within a single housing, simultaneously records the three-dimensional shape of the face from either the right or left side. Two sets of cameras are located at the two ends of the arched opening, independently or simultaneously recording both sides of the patient's mouth and face, as well as the visual markings M1 and / or M2 fixed to the crowns of the upper and lower teeth. Each camera set includes three cameras spaced at predetermined distances. Each set has two monochrome or color cameras with a maximum resolution of 2.3 Mbps and a high frame rate of at least 1000 FPS, equipped with dedicated optics / lenses, and one color camera with a minimum resolution of 12 Mbps.

The invention discloses a multi-material gradient bionic dental crown and a digital preparation method thereof, and belongs to the technical field of dental restoration materials and digital additive manufacturing. Comprising a dental crown body, the dental crown body is provided with a material structure of which the mechanical property continuously changes in a gradient manner along with the surface of a prepared tooth body, is formed by mixing two basic resin materials through voxel-level gradient in space, and is divided into two functional layers by imitating a double-layer hard tissue physiological structure of a natural tooth; comprising a high-wear-resistance bionic enamel layer used for forming the outer surface of a dental crown body and a high-toughness bionic dentin layer used for forming the dental crown body and connecting the high-wear-resistance bionic enamel layer and the surface of a prepared tooth body. By simulating a gradient structure of a natural tooth and a crack inhibition mechanism of the enamel-dentin boundary (DEJ), the fracture toughness and the anti-fatigue life of the dental crown body are far better than those of a traditional single-layer or layered all-ceramic crown, and thermal stress and mechanical stress are effectively buffered through modulus matching of the high-toughness bionic dentin layer and a resin adhesive.

Disclosed is a glass-ceramic block containing a crystal phase in a non-crystalline glass matrix, a main crystal phase of the crystal phase including lithium pyrosilicate, an additional crystal phase including eucryptite, a gradient of the main crystal phase size with respect to the depth, a functionally graded material in which the value of the gradient of the main crystal phase size changes without an interface, a dental block required for cutting processing, which can be effectively used to manufacture artificial tooth restorations similar in aesthetics to natural teeth, and which, due to the inclusion of the additional crystal phase such as eucryptite, can be easily manufactured into artificial tooth restorations by mechanical processing compared to a phase including only lithium pyrosilicate, thereby not only shortening the manufacturing time but also increasing the structural stability in terms of force dispersion through functional grading of mechanical properties.

An image processing method for displaying a tartar region on the basis of an image obtained by imaging teeth and tartar subjected to a fluorescence reaction caused by irradiating the teeth with light of a wavelength band including blue light (S201-S206), in which a natural tooth region among the tooth regions is detected on the basis of the image; detecting a tartar region on the basis of the image (S207); and displaying a tartar region (S105), limited only to a natural tooth region. The image processing method may, for example, detect a first region, which is (i) a region having a luminance value equal to or greater than a preset first threshold value among all pixel regions of the image, and (ii) a region having a luminance value equal to or greater than a preset second threshold value among all pixel regions of the image, and detect a natural tooth region on the basis of the first region during detection of the natural tooth region. Or (ii) a region in which the green pixel value is equal to or greater than a preset second threshold value among all pixel regions of the image.