231 results about "Missing tooth" patented technology

Systems and methods are disclosed for forming a pontic in a polymeric shell dental appliance, including providing a polymeric shell dental appliance of the type which is removably placeable over a patient's dentition, said shell having a concave trough which conforms to the teeth when the appliance is placed over the dentition and a location in the trough corresponding to a missing tooth; and depositing a flexible, durably affixed material in the location to form the pontic.

A systematic approach to planning and selection of a dental implant. Models of the patient's dentition, including the gingival and supporting bone structure are analyzed in relation to a model of the dentition that will be replaced by the implant. Based on information collected from a missing tooth (or teeth) model, greater insight can be gained into the functional and aesthetic attributes of the implant best suited for the patient. And from this realization a more informed decision can be made for planning the procedure for installation of the implant for the patient, and selection of the implant, e.g., size, type and orientation of supporting fixture and abutment.

An endosseous dental implant system employs an implant member designed to be embedded into the jawbone of a patient at a location vacated by a missing tooth, and a mating abutment member. Both the abutment member and the implant member have mutually facing gingival ends. A socket of uniform, noncircular cross section throughout is defined into the gingival end of either the implant member or the abutment member while a post of corresponding cross-sectional configuration extends from the gingival end of the other member. At least one, and possibly a plurality, of transversely directed projections are formed on the post. These projections are small enough to allow the post to enter the socket in close fitting, seated engagement therewith, but large enough to create an interference fit between the post and the socket to obstruct twisting of the post within the socket. Apart from the transversely extending projections, the post has a uniform cross sectional shape and dimensions throughout its length.

Systems and methods are disclosed for forming a pontic in a polymeric shell dental appliance, including providing a polymeric shell dental appliance of the type which is removably placeable over a patient's dentition, said shell having a concave trough which conforms to the teeth when the appliance is placed over the dentition and a location in the trough corresponding to a missing tooth; and depositing a flexible, durably affixed material in the location to form the pontic.

An endosseous dental implant system employs an implant member designed to be embedded into the jawbone of a patient at a location vacated by a missing tooth, and a mating abutment member. Both the abutment member and the implant member have mutually facing gingival ends. A socket of uniform, noncircular cross section throughout is defined into the gingival end of either the implant member or the abutment member while a post of corresponding cross-sectional configuration extends from the gingival end of the other member. At least one, and possibly a plurality, of transversely directed projections are formed on the post. These projections are small enough to allow the post to enter the socket in close fitting, seated engagement therewith, but large enough to create an interference fit between the post and the socket to obstruct twisting of the post within the socket. Apart from the transversely extending projections, the post has a uniform cross sectional shape and dimensions throughout its length.

The invention discloses a novel dental prosthesis CAD / CAM / SLM-3D printing compound method. The method comprises the steps that a CAD / CAM / SLM-3D printing compound system which is composed of an optical scanning measuring instrument or a contact type scanning measuring instrument, computer-aided design software of a dental prosthesis, a miniaturized metal 3D printer and a numerical control milling machine is adopted to prepare a metal prosthesis, an existing dental CAD / CAM system is combined with a metal 3D printing technology, respective numerical control machining methods are organically combined, and the effect is extremely achieved. The automated production efficiency of the dental metal prosthesis, especially the complex dental metal prosthesis is greatly improved, traditional cumbersome processes for manually making a dental prosthesis are omitted, the making quality and stability of the prosthesis are improved, the purpose of rapid, accurate and personalized making is achieved, and the urgent needs of patients missing teeth are well met.

Systems, apparatuses, devices, kits and processes are provided to enhance bone implants. The bone implant includes one or more bone attachment components for securing the implant into a bone and a head component independent of and separable from the bone attachment components. In one embodiment, each bone attachment component includes an internally threaded bore hole sleeve for receiving a connector component. The head component preferably is adapted so as to be secured to the one or more bone attachment components at the time of initial implantation of the one or more bone attachment components and the head component into the bone. The head component preferably is adapted to be oriented relative to at least one of the one or more bone attachment components at a predetermined tilt angle, so that the implant generally conforms with a natural root structure of a missing tooth.

The invention relates to a method for designing and manufacturing a repair-orientated planting bone augmentation guide plate. The method comprises the following steps: shooting CT of a patient to obtain a planting three-dimensional space; carrying out intraoral three-dimensional scanning or scanning a gypsum model to obtain patient data; fusing the two parts of data; designing missing teeth and a tooth long shaft; locating an implant by using the tooth long shaft; adjusting the position and posture of the implant; extracting mesiodistal ortho-tooth half-crown data in the tooth missing region, and increasing the thickness uniformly; measuring the straight line-segment distance between the occlusal surface and the tail end of the implant body; generating a three-dimensional digital model of the planting guide plate; and designing the outer surface of the bone augmentation area after bone graft, increasing the thickness, and reserving a bone grafting material filling hole, thus completing designing and processing. According to the method provided by the invention, the mesiodistal position, the buccolingual position, the torque angle and the shaft inclination degree for oral implantation of the tooth implant can be accurately guided, the accurate bone augmentation operation is realized, the tooth planting risk is reduced, the implant amount and surface form of the allogenic bone augmentation material can be conveniently and accurately controlled, and thus the success rate of the tooth planting operation can be improved.

The invention relates to a method for producing a tooth plant positioning guiding template, comprising the following steps: (1) scanning the jaw bone of sufferers by multiple-layer helix CT to obtain the three dimensional anatomy structure information of the jaw bone; (2) establishing a three dimensional jaw bone model in CAD software; (3) measuring the bone structure of the plant area lack of tooth according to the three dimensional jaw bone model; (4) confirming the plant point, direction and depth of the dental implant according to the measuring result; (5) producing the positioning guiding template entity model based on dental face- bone face combination support type by applying photo-curing rapid forming technology; (6) having surface treatment to the positioning guiding template entity prototype. The advantage of the invention is that: a surgery positioning guiding template adopts a retention method of dental face-bone face combination support with accurate retention, high precision and convenient process.

The invention relates to a phase detection device of an engine. A cam shaft signal panel of the device is fixedly installed on a cam shaft. A crankshaft signal panel is fixedly installed on a crankshaft. Three normal teeth and an extra tooth are distributed at the edge of the cam shaft signal panel at equal intervals, and the extra tooth is located between two of the three normal teeth. N continuous equally-spaced teeth and a missing tooth are distributed at the edge of the crankshaft signal panel. A first Hall sensor is fixed to the edge of the cam shaft signal panel, and a second Hall sensor is fixed to the edge of the crankshaft signal panel. A cam shaft pulse signal which is generated by the first Hall sensor and represents cam shaft phase information and a crankshaft pulse signal which is generated by the second Hall sensor and represents crankshaft phase information are transmitted to an engine phase detection module. The engine phase detection module carries out analysis treatment on the cam shaft pulse signal and the crankshaft pulse signal so that engine phase data can be obtained. By means of the phase detection device of the engine, the start time of the engine is shortened, performance of an electric control system of the engine is improved, and the robustness of the electric control system is enhanced.

The invention discloses a three-dimensional target. The three-dimensional target adopts a three-dimensional square ring shape, 38 uniform sawtooth-shaped grooves are formed in each edge of the three-dimensional square ring, and a missing tooth is arranged in the middle of each side edge of the three-dimensional square ring; the cross section of each of the sawtooth-shaped grooves is isosceles triangle. The invention further discloses a global unified calibration method used for a linear structured light profile sensor and implemented through the three-dimensional target. The global unified calibration method for the linear structured light profile sensor comprises the following steps: the target meeting a field range is designed, and a corresponding two-dimensional precision translation stage is selected; then four sets of linear structured light profile sensor profile measurement systems are established and shoot light bar images on the target simultaneously from different positions in combination with the two-dimensional precision translation stage. According to the calibration method, acquired images are processed and calculated in the following process sequentially: feature point extraction, camera calibration and coordinate system unification, and calibration of the whole system can be completed.

A lock structure including an activation device, a combination lock, and a setting device is provided. The combination lock has a plurality of dials, a shaft passing through the dials, and a plurality of first gears disposed on one side of each dial. Each first gear further includes a missing tooth. One end of the shaft is connected to the activation device. The setting device has a plurality of second gears corresponding to the first gears and a setting shaft, wherein one end of the setting shaft passes through the second gears and the other end is connected to the activation device. When the activation device is activated, the second gears are driven to rotate the first gears, so that when each second gear runs free with the missing tooth of each first gear, the dials are in a predetermined position. That is, by means of the activation device and the setting device, the dials of the combination lock can automatically return to the predetermined position after opening or closing the lock.

A method for detecting missing tooth in mining shovel, implemented using a processing device, includes receiving a pair of image frames from a camera disposed on a rope mine shovel configured to carry a mining load. A tooth line region corresponding to the pair of image frames is detected to generate a pair of tooth line regions based on a shovel template set. A difference image is determined based on the pair of image frames and the pair of tooth line regions. Further, a response map representative of possible tooth positions is determined based on the difference image using a tooth template matching technique. A tooth line is selected among a plurality of candidate tooth lines based on the response map. Further, a tooth condition is determined based on the tooth line and the difference image. The tooth condition is notified to an operator of the rope mine shovel.

The invention provides a threaded hole structure quality detection method. A CCD camera and an annular light source are used for quality detection of internal threads. The index items of the detection of the internal threads include external diameter, internal diameter, percentage of thread, number of thread teeth, tooth pitch, tooth depth, and the number of effective teeth. Identifiable ineffective teeth include broken teeth, missing teeth, foreign bodies and burr.

The invention relates to an individualized biomimetic dental implant and a manufacture method thereof. The invention is characterized in that the dental implant comprises an implant body for imitating the original tooth root tissue structure of a patient's missing tooth and also comprises a biomimetic artificial alveolar bone structure outer-layer for imitating a patient's alveolar bone tissue structure. The biomimetic artificial alveolar bone structure outer-layer and the external surface of the implant body are combined as a whole. The biomimetic tooth root implant body's outer layer is a 3D printed biomimetic artificial alveolar bone structure outer-layer which is combined with the implant body to form a whole structure, and is similar to the tissue structures of missing tooth's original tooth root and alveolar bone. Thus, the invention provides an ideal implementation scheme of a biomimetic artificial tooth root structure. What is the most important is that the invention provides a structure which is beneficial to bone marrow stem cell and osteogenesis-related cell adhesion, proliferation and mineralization and gives play to final osteogenic function and has good bioactivity. Therefore, a microenvironment for promoting osteogenesis is created, osteocyte generation is induced, and early rapid and firm synosteosis is realized.

The present invention provides a method for obtaining an estimation of the shape, position and / or orientation of one or more existing teeth of a patient or of one or more teeth to be included in a dental restoration destined to replace one or more missing teeth in a partially edentulous patient. The method involves adapting a virtual teeth setup to the intra-oral anatomical situation of the patient, wherein said virtual teeth setup comprises separated surface meshes of individual teeth positioned in a dental arch or segment thereof. The virtual teeth setup is adapted by optimizing an energy function, which represents a quality measure for said virtual teeth setup, and using a statistical model, which describes for a given dentition or segment thereof a probability distribution for at leastthe shapes of individual teeth, the relations between shapes of neighbouring teeth and / or relations between positions and / or orientations of neighbouring teeth. The adapted virtual teeth setup resulting from said optimized energy function is subsequently used to estimate said sought for shape, position and / or orientation.

The present invention provides a dressing gear which facilitates fine dressing and grinding with small modulus and a method for dressing with the dressing gear. The dressing gear is characterized in that: diamond fine particles or CBN fine particles are coated on the surface of each tooth for forming a tooth-shortage structure which has an even number of total tooth number and has one missed tooth alternatively for each half of the total teeth; and fine dressing and grinding are performed through a diamond grinding wheel. A synchronization system which causes a main shaft of the tool and a main shaft of a workpiece to match and interlock at a state that the dressing gear is engaged with a gear-shaped grinding wheel, thereby dressing all teeth of the gear-shaped grinding wheel.

A custom tool for forming a dental restoration in a mouth of a patient includes a mold body providing for a customized fit with at least one tooth of the patient. The mold body includes a facial portion forming a facial surface corresponding with a facial surface of the tooth, and a separate lingual portion forming a lingual surface corresponding with a lingual surface of the tooth. The mold body is configured to combine with the tooth of the patient to form a mold cavity encompassing missing tooth structure of the tooth.

The invention relates to a medical dental implant with the surface biomimetic function and a manufacturing method thereof. The medical dental implant is characterized in that the medical dental implant comprises an implant body and further comprises an outer layer of a bionic artificial bone structure, the outer layer is integrally combined with the outer surface of the implant body and capable of simulating the alveolar cavity bone tissue structure around the tooth root portion of a missing tooth of a patient. According to the medical dental implant and the manufacturing method thereof, the outer layer of the bionic bone structure, which is formed in a 3D printing mode and of a massive structure, serves as the outer layer of the tooth implant body, and therefore an ideal embodiment used for simulating the artificial bone surface structure is provided. More importantly, a good activity surface layer structure foundation beneficial to bone marrow stem cell and bone-formation related cell adhesion, proliferation and growth and capable of playing the final bone-formation function is provided, the surface of the foundation is loaded with chemical components such as calcium and phosphate and bioactive molecules such as collagens, hence, a bone-formation promotion microenvironment is created, bone cell generation is induced, and fast and firm bone combination can be achieved at the early stage.

The invention provides a high pressure common rail system control method and device. When a cam shaft sensor is in a normal working state and a crank shaft rotating speed sensor is in an abnormal working state, a signal of the crank rotating speed sensor is determined and simulated through a signal of the cam shaft sensor so that an oil sprayer can be controlled to spray oil to an air cylinder. When the crank shaft rotating speed sensor is in a normal working state and the cam shaft sensor is in an abnormal working state, the air cylinder is judged through missing teeth according to the signal of the crank shaft rotating speed sensor, and a monoblock pump is randomly selected to supply oil to a pressure accumulation oil rail. If preset rail pressure is reached within a preset time period, it is proved that the monoblock pump is correctly selected, and if preset rail pressure is not reached within the preset time period, another monoblock pump needs to be selected again to set up rail pressure. When one of the cam shaft sensor and the crank shaft rotating speed sensor is abnormal, a high pressure common rail system can be effectively controlled to supply oil to the monoblock pump and spray oil to an oil spraying nozzle through the signal of one sensor, and normal work of an engine is ensured.

In order to overcome the defects of an existing gingival margin curve extraction mode, the present invention discloses a gingival margin curve design method for a personalized implant tooth. The gingival margin curve design method for the personalized implant tooth comprises the following steps of: a step 1 of respectively reconstructing gingival margin profiles of a residual tooth of a patient suffering from tooth missing and a three-dimensional dental model of a sample, extracting feature regions of gingival margin curves according to an obtained maximum principal curvature value, extracting gingival margin feature lines of the residual tooth of the patient suffering from tooth missing and the sample by utilizing a granular computing and cellular automaton combining method, then respectively fitting the gingival margin feature curves of the residual tooth of the patient suffering from tooth missing and the dental model of the sample, and finally, constructing a single gingival margin curve of the residual tooth of the patient suffering from tooth missing and the sample; a step 2 of constructing a gingival margin biological multivariate statistical analysis model of the sample; and a step 3 of designing a personalized gingival margin curve of a missed tooth of the patient. The method disclosed by the present invention aims to improve accuracy and efficiency of designing the implant tooth gingival margin curve, improve the repaired gingival margin profile form of the implant tooth, and improve a repair success rate of the personalized implant tooth.

The invention provides a double air guide plate driving mechanism and an air conditioner with the double air guide plate driving mechanism. The double air guide plate driving mechanism comprises a first gear, a second gear, a third gear and a driving motor, wherein the first gear is fixedly arranged on a rotating shaft at a first end of a lower air guide plate; the second gear is fixedly arranged on a rotating shaft at the end of an upper air guide plate corresponding to the first gear; the third gear is in meshed transmission with the first gear and the second gear; and the driving motor is in driving connection with the first gear or the third gear. At least one of the first gear, the second gear and the third gear is provided with a first missing tooth part which is in demeshing with the gear adjacent to the first missing tooth part when the upper air guide plate rotates to the upper limit position. At least one of the first gear, the second gear and the third gear is provided with the first missing tooth part, so that when the upper air guide plate rotates to the upper limit position, the second gear is no longer driven, the lower air guide plate can still rotate through a certain angle, the air guide angle of the lower air guide plate is expanded, and the air guide effect of the air conditioner is improved.

The invention relates to a method for accurately matching CBCT data with STL data, which is characterized by comprising the following steps of: a) adhering an anti-radiation material on teeth, adhering the anti-radiation material on gingival mucosa or / and adhering the anti-radiation material on other anatomical characteristics; b) carrying out CBCT shooting to obtain the CBCT data with the information of the radiation-resistant material; c) acquiring the oral cavity surface STL data; and d) matching the CBCT data with the STL data. According to the method for accurately matching the CBCT dataand the STL data, the matching precision and success rate of the CBCT data and the STL data can be greatly improved, the comfort level of a patient is improved, the number of times of re-diagnosis isreduced, the clinical medical cost is reduced, the difficulty of integrating the two kinds of data is reduced, and especially when the number of missing teeth is large, production is convenient and easy.