49 results about "Premolar tooth" patented technology

A device for therapeutic includes a rigid screen (1) that is insertable behind the upper and lower lips of a user's mouth, the screen having a compound curvature and in a horizontal plane generally U-shaped profile, and in a vertical plane a convexo-concave cross-sectional profile that is gradually flattening from a central mid region towards the left and right ends (12, 13) thereof, the ends extended to reach at least past the premolar teeth on each side in the upper and lower jaws of the user when applied. A handle is attached to extend forward from a central mid region in the convex front face of the screen, the handle including a rigid stem (2) projecting from the front face at a neutral angle with respect to upper (5) and lower (6) halves of the screen (1), diverging from the stem in the vertical view.

In one aspect, the present invention is directed to an apparatus for chewing obstruction, the apparatus comprising: a pad, the contour of which corresponds to the contour of one or more molar or premolar teeth; and an adherent, for adhering the pad to one or more molar teeth. Preferably, the thickness of the pad is substantially between 0.5 to 10 mm. The adherent may comprise an adhesive substance. The pad may comprise a flexible substance, such as a spongy material (e.g., polypropylene) and rubber. According to one embodiment of the invention, the adherent is adapted to lose the adhesiveness thereof after a certain time period. Preferably, the time period is between one and five hours. In another aspect, the present invention is directed to a medicament form, comprising: a pad in which a dissolving medicament is absorbed; and an adherent, for adhering said pad to one or more teeth.

The invention discloses a measuring device and method for the implantation site in dental implantation. The measuring device comprises a ruler I, a ruler II, a ruler III, a ruler IV, a ruler V and a ruler VI, wherein the ruler I is used for gap measurement and diagnosis and implant positioning when in loss of single premolar tooth; the ruler II is used for gap measurement and diagnosis and implantpositioning when in loss of single molar tooth; the ruler III is used for continuous implant positioning when in loss of continuous teeth; the ruler IV is used for gap measurement and diagnosis and implant positioning when in loss of continuous premolar teeth; the ruler V is used for gap measurement and diagnosis and implant positioning when in loss of continuous molar teeth; the ruler VI is usedfor gap measurement and diagnosis and implant positioning when in loss of continuous posterior teeth. The measuring device and method disclosed by the invention have the beneficial effects that by adoption of the measuring device provided by the invention, auxiliary positioning can be carried out on the conventional oral-cavity implantation surgery at the posterior-teeth area; the cost is low, the operation is simple, the use is convenient, the accuracy is high, the error is small, the ideal position of the implant can be more accurately and quickly positioned in the surgery.

An orthodontic appliance for orthodontic treatment of a posterior maxillary sector extending from a mesial anchor tooth to a molar tooth unilaterally on the same side of the maxilla is provided. The appliance features a molar component, a mesial anchor tooth attachment, a long rod, and a hook. The long rod is saddle-shaped in the occlusal-gingival plane, and may have a distal step-down portion. The rod may extend at a mesial end thereof from the mesial anchor tooth attachment towards the molar component in a mesiodistal direction, and the rod may also have a mesial step-up portion starting from the mesial anchor tooth or premolar attachment. The hook may be located on the rod, for attachment with a traction element for direct molar traction. Under force of the traction element the rod exerts force on the molar component for molar distillation.

The invention discloses an automatic recognition algorithm for feature points of tooth models based on local coordinates. The tooth models and a local coordinate system are input, a jaw point, an axispoint and a gum point of each tooth model are recognized, thee points of a sharp tooth point of a tooth model of molar and a CAC curve are recognized, and the sharp points of the tooth models of themolar, a premolar and a canine are recognized. The local coordinates are utilized to assist in automatic recognition of feature points, thereby facilitating later correction assessment and registration, and greatly reducing human errors to a certain extent while saving time.

The present invention describes an improved surgical mouth gag for the exposure of the palatal and oropharyngeal region of a patient comprising a frame (2) adapted to be arranged in use around the mouth of the patient and a tongue depressor system (21, 30) insertable in the oral cavity of the patient and movable with respect to the frame (2), the tongue depressor blade (21, 30) comprising two elements articulated to each other, able to mobilise fully in a graduated way the entire tongue base both in the caudal and posterior-anterior direction. The metal arch (2) supports and anchors the aforesaid tongue depressor system, by resting on the upper premolar and molar teeth (respecting the incisors) and acts as an anterior window adapted to guarantee both optimal exposure of the palatal structures and of the isthmus of the fauces and to facilitate palatal and oropharyngeal surgery in general and that of obstructive sleep disorders in particular.

A device for therapeutic includes a rigid screen (1) that is insertable behind the upper and lower lips of a user's mouth, the screen having a compound curvature and in a horizontal plane generally U-shaped profile, and in a vertical plane a convexo-concave cross-sectional profile that is gradually flattening from a central mid region towards the left and right ends (12, 13) thereof, the ends extended to reach at least past the premolar teeth on each side in the upper and lower jaws of the user when applied. A handle is attached to extend forward from a central mid region in the convex front face of the screen, the handle including a rigid stem (2) projecting from the front face at a neutral angle with respect to upper (5) and lower (6) halves of the screen (1), diverging from the stem in the vertical view.

A method for finishing class II composite fillings on a mesial surface of molar and premolar teeth comprising using a blade to scrape excess resin on the mesial surface a molar or premolar tooth, wherein the blade comprises a blade protrusion on one side and the blade protrusion comprises a cutting edge, and the cutting edge is curved to compliment the mesial curvature of a molar or premolar tooth.

The invention discloses a ruler for measuring visual widths of teeth. The ruler comprises an HE surface plate, wherein a support stand column is arranged at the edge close to the front end of the upper surface of the HE surface plate; the support stand column is connected with a connecting column through a joint; a base ruler is arranged on the connecting column; scales are arranged on the base ruler; and a slideable probe for indicating the scales is arranged on the base ruler. The ruler for measuring the visual widths of the teeth, provided by the invention, is simple in operation, convenient for use, accurate in measuring results, capable of accurately measuring the visual widths of the teeth and particularly the visual and aesthetic widths of front teeth and beneficial to the operation and the accurate evaluation of the clinical repair work of doctors to ensure that the visual widths of repaired maxillary front teeth and premolar tooth are coordinated and attractive in appearance.

The invention discloses an automatic stress applying functional correction device applied to upper jaw palate expansion. The correction device comprises a dental arch expander, wherein an expander body which is arranged at the position of the upper jaw is arranged in the center of the dental arch expander, bands are respectively connected to the two sides of the expander body through connection rods, two bands are arranged on the each side of the expander body, and the two bands are respectively used for sleeving a first premolar and a first molar. The correction device further comprises two base supporting plates which are used for being clamped to the left side and the right side of the upper jaw, wherein the appearance of the base supporting plates are adaptive to the shape of the upperjaw, the expander body is arranged between the two base supporting plates, and the left end and the right end of the expander body are partially embedded into the left base supporting plate and the right base supporting plate. The correction device further comprises two cheek screens which are used for being arranged on the outer sides of teeth on the left side and the right side, wherein the appearance of each cheek screen is adaptive to the shape of the outer side of the tooth tightly close to the cheek screen, and each cheek screen is connected to the base supporting plate adjacent to thecheek screen through a steel wire. Therefore, an unstable dental arch expanding effect in the prior art is overcome.

The invention provides an underjaw premolar teeth residual root traction device, and relates to the field of orthodontic instruments. The device uses first molar teeth and second molar teeth at the same side as anchorage teeth and comprises two platy bottom plates, a steel wire, a buccal tube, an Niti wire, a thrust spring and a tongue side button; two opposite side surfaces of the platy bottom plates are connected by the steel wire; the buccal tube is arranged on the steel wire; an included angle between the side wall, parallel with the bottom plates, of the inner wall of the cavity of the buccal tube and a sagittal surface is 30-45 degrees; an included angle between the side wall vertical to the bottom plates and a crown-shaped surface is 45-90 degrees; the inlet end of the buccal tube faces an occlusion direction and the outlet end faces a root direction; one end of the Niti wire is connected with the tongue side button, the other end of the Niti wire penetrates through the buccal tube and is bent backwards, the thrust spring sleeves outside the Niti wire between the inlet end of the buccal tube and the tongue side button, the Niti wire is in a stretching state; the thrust spring is in a compressed state. The traction device can provide continuous correction force, effectively draws a residual root to the occlusion direction and is favorable for the recovery treatment of a post crown.

The invention provides an adjustable bracket integrated front molar band. The adjustable bracket integrated front molar band comprises an adjustable band and a bracket; the adjustable band is a band formed by a metal band through bending and coiling; the metal band is divided into two sections which are marked as a metal band I and a metal band II, wherein the metal band I is wider than the metal band II; an inserting groove used for allowing the metal band II to pass through is formed in the metal band I; the part, which passes through the inserting groove, of the metal band II is folded and welded reversely and then is tightly attached to the tongue side surface of the band; the bracket is positioned on the cheek side surface of the metal band I; and the bracket and the adjustable band are in an integrated structure. The band disclosed in the invention adopts open mode design, without needing try-in, and the length, passing through the inserting groove, of the metal band II can be directly adjusted according to the sizes of teeth; and meanwhile, the adjustable bracket integrated front molar band is simple and convenient to operate in clinical application, time-saving and labor-saving, and can be completely operated by only one person.

Toothaches belong to external reactions of dental diseases, and can be caused by that gum surrounding dental caries, dental nucleus or canine teeth is infected. When premolar teeth are cracked, toothaches can also be caused, and sometimes, the toothaches can also be caused by that vegetable scraps clamped in spaces between teeth cause discomfort. In addition, the toothaches can also be initiated by nasosinusitis. In real life, many methods for treating the toothaches exist, but the methods have certain side effects. Raw materials adopted by a food therapy method disclosed by the invention are foods, and are harmless to bodies. According to the food therapy method for treating the toothaches, disclosed by the invention, 15-25 grams of honeysuckle flowers, 15-25 wild chrysanthemums and 20-30 jasmine flowers are adopted.

The invention discloses a tooth uprighting device and method. The device comprises a bottom plate, a cantilever and an elastic rubber band, the bottom plate is a cuboid thin sheet, the front surface of the bottom plate is fixedly provided with a traction buckle, the cantilever is fixedly arranged in one side surface of the bottom plate, and the cantilever is provided with a plurality of hooks at fixed intervals in the extending direction of a rod. Firstly, the outer side surfaces of upper and lower teeth needing to be righted are ground to form sticking areas; then, appropriate length of the cantilever is determined, and the elongated portion is cut off from one end of the cantilever; then, two sets of tooth uprighting devices are respectively stuck on the sticking areas on the outer sidesurfaces of the upper and lower teeth at a certain angle; and finally, the elastic rubber band is hung at the hooks at the tail end of the cantilever. According to the tooth uprighting device and method designed by the invention, the sequelae of inclination of molar and premolar caused by invisible braces after orthopaedic treatment and the symptoms of inclination of teeth caused by other conditions can be solved.

The embodiment of the present application provides an orthodontic device and a treatment method for vertically and mesally moving mandibular molars, which relate to the technical field of orthodontics. The orthodontic device is formed by bending stainless steel square wires, and includes a fixed section, a first force application section and a second force application section connected in sequence. The free end of the fixed segment is fixedly connected with the anchorage located in the premolar area. At least one closing curve is arranged in the first force applying section; the closing curve includes a first torsion portion, a first moment arm and a second moment arm located at the first torsion portion. The torsion generated by the first torsion part provides the correction force in the mesial direction. The second force application section includes a second torsion portion, a third moment arm and a fourth moment arm. The third moment arm is connected to the second moment arm, the fourth moment arm and the third moment arm are arranged at an obtuse angle, and the second torsion part generates a vertical force toward the target molar through the free end of the fourth moment arm. According to the present application, the mesial movement and vertical movement of the molars can be carried out simultaneously, which reduces the operation time by the chair, shortens the treatment period, and improves the patient's comfort.

The invention provides a dentin-pulp complex preparation method. The preparation method comprises the following steps: 1) after informed consent of a patient, collecting caries-free premolar teeth pulled out for orthodontic treatment in surgery departments of stomatological hospitals, removing soft tissues, washing clean and storing in -80 DEG C refrigerator for standby application; 2) in preparation, taking out a sample tooth, cutting a crown enamel part out on a low-speed hard tissue slicing machine and leaving and taking a dentin layer from the top of a pulp cavity to the crown, wherein thethickness is 1.5mm; 3) continuing cutting the obtained dentin into dentin slices with length * width * height as 2mm * 2mm * 2mm; 4) soaking dentin chips into in a 5 to 20%w / w EDTA solution for 10min, washing by PBS for 5min three times, soaking for 1min in a 19%w / w citric acid solution and washing by PBS for 5min three times. The dentin-pulp complex preparation method disclosed by the inventionhas the following beneficial effects: 1) a standardized preparation method can improve repeatability and scientificity of correlational researches; 2) the standardized preparation method can be used for detecting odotogenetic differentiation potential of seed cells in an experiment.

The invention discloses an application of a fibrous strip for preparing a pulp-perforation cracked molar repairing body. A crack of a pulp-perforation cracked molar is located at a dental crown occlusion face along a developmental groove in a mesial and distal direction and is parallel to a tooth long axis. The depth of the crack is 1.0 mm from the pulp perforation position to the cemento-enamel junction in a root direction, and the width of the crack is 0.01-0.10 mm, and the thickness of the fibrous strip is 1.0-1.5 mm, and the width is 2.0-3.0 mm. The fibrous strip is located at a dental crown occlusion face in a direction vertical to the crack, or the fibrous strip is located in a medullary space to form rectangular laying, or the fibrous strip is located in a medullary space to form annular laying. The thickness of the fibrous strip is 1.0-1.5 mm, and the width is 2.0-3.0 mm. The fibrous strip is added in a resin repairing body, can improve stress concentration on the tip of the pulp-perforation tooth crack from a maxillary first premolar in a mesial and distal direction, and can efficiently prevent further development of a full crown lower crack. An excellent effect is obtained by performing annular laying of the fibrous strip in a direction vertical to the crack level in a medullary space.

The invention discloses a double-main-groove three-section type multifunctional oral cavity correction system. The double-main-groove three-section type multifunctional oral cavity correction system comprises a self-ligating bracket, a first buccal tube, a second buccal tube and an arch wire system, wherein the self-ligating bracket is arranged on all incisor teeth, canine teeth and premolar teeth in a tooth system and comprises a bracket body and a bottom plate, and the bracket body is connected with the bottom plate. The invention further discloses a double-main-groove three-section type multifunctional oral cavity correction method. A segmental arch technology, an auxiliary arch technology, a sliding method gap closing technology and the like are combined, the situations that in other correction systems, friction force is not controlled, alignment and leveling are not convenient, and anchorage is lost are greatly reduced, and the correction result is more controllable.

The invention discloses a molar back push device. The device comprises at least one retention part, at least one implantation nail and at least one connecting piece; each retention part comprises a retention part and a traction hook; the retention parts are connected to the dental crown palate sides of premolar, first molar and second molar on one side of the upper jaw of an oral cavity; the traction hooks are respectively arranged at the near-middle ends of the retention parts; the implantation nails are in one-to-one correspondence with the retention parts, and each implantation nail is located between the palatal root of the first molar and the palatal root of the second molar on the same side as one retention part and is close to the second molar; and each connecting piece is connectedbetween one planting nail and one traction hook on the same side. Through the device, the molars can be moved backwards as much as possible within a physiological limit, stress application is more flexible, and adverse molar buccal inclination and tooth rotation are avoided. Meanwhile, the bonding area is increased, bonding strength is improved, intraoral stability of the device is optimized, clinical use is facilitated, and the device has good comfort.

The invention relates to an orthodontic self-locking bracket system with open auxiliary grooves, comprising a plurality of brackets, the brackets are provided with inner main grooves and auxiliary grooves, and an elastic The baffle plate and the bracket are provided with the first bracket, the second bracket and the third bracket, and the two ends of the elastic baffle of the first bracket are flush with the two side walls of the first bracket; One end of the elastic baffle is flush with the side wall of the second bracket, and the other end forms a unilateral gap with the side wall of the second bracket; the two ends of the elastic baffle of the third bracket are symmetrically arranged with double side notch. In the present invention, the first bracket is installed on the incisors, the second bracket is installed on the canines, and the third bracket is installed on the premolars, and the elastic baffles of the first bracket, the second bracket and the third bracket are cleverly used Set, so that the arch wire of the bracket system produces different correction forces at the positions corresponding to different brackets.

The invention relates to a substitution body of a temporary restoration for dental medical treatment and a temporary tooth preparation method. The substitution body of the temporary restoration for dental medical treatment disclosed by the invention is characterized by comprising a kernel of single tooth form shaped as an incisor tooth, a canine tooth, a premolar tooth or a molar or a kernel of an arrangement combination body of the single tooth form; thermoplastic materials, such as modelling compound, reshaping plastic wax and the like, are attached at the lip cheek side, the tongue palate side and contact surfaces and tissue surfaces of adjacent teeth of the kernel. According to the invention, the temporary tooth substitution body formed by connecting one or more teeth together and attached with thermoplastic materials, such as modelling compound, reshaping plastic wax and the like, is adopted, therefore, the material and the time for manufacturing temporary teeth in an extraoral manner are saved; communication between doctors and patients is more convenient; the substitution body is beneficial to pre-judging a treatment effect by doctors and preparing a guide tooth body; medical communication is simple and effective; the medical cost is reduced; in addition, compared with the temporary restoration designed and manufactured by a computer in an assistant manner, the substitution body disclosed by the invention has the obvious advantages of being low in cost, convenient in time and few in link.

The invention discloses a two-in-one lip-cheek flaring angle retractor, and belongs to the technical field of retractors. The retractor comprises a flaring angle mechanism, a hook traction mechanism and a vibration handle structure; the vibration handle structure is installed at the bottom of the flaring angle mechanism and is located at the middle position of the bottom of the flaring angle mechanism; and the hook traction mechanism is mounted in the flaring angle mechanism. The flaring angle mechanism and the hook traction mechanism are integrated together, the lip of a patient can be lifted upwards through the flaring angle mechanism, the lip-cheek side tooth cracking condition of the premolar area and the molar area can be conveniently seen, and through the hook traction mechanism, the two sides of the lip and the cheek of the patient can be retracted; and finally, the other hand is used for photographing and recording by using the camera, the operation is very inconvenient, one person can operate, the manpower is less, and the cost is low.

The invention discloses a preparation method of a tooth whitening elastic veneering bridge, which comprises the following steps: step 1, acquiring a corresponding oral impression for a wearing area; 2, preparing an oral cavity model according to the oral cavity impression in the step 1; 3, scanning and converting the oral cavity model in the step 2 into a digital three-dimensional model; 4, designing a veneering bridge according to the digital three-dimensional model in the step 3; step 5, manufacturing and assembling the veneering bridge; wherein in the first step, a collection body adopted for obtaining the oral impression completely wraps premolars and molars in a wearing area; only the contours of the binding surfaces of incisors and canine teeth in the wearing area are collected; by differentially manufacturing incisor teeth, canine teeth, premolars and molars in the oral cavity, the matching firmness of abutment teeth on the two sides of the oral cavity is ensured, meanwhile, the chewing and occlusion interference on upper and lower abutment teeth in the middle of the oral cavity is remarkably reduced, and the wearing comfort is greatly improved.

The invention provides a dental composite material, a multi-layer dental composite material and a preparation method and application thereof. The preparation method of the dental composite material comprises the steps of mixing, stirring, shearing and grinding, vacuum defoaming and curing. The multi-layer dental composite material is of a two-layer structure and comprises at least one layer of dental composite material and / or at least one layer of dental polymer. The composite material can be layered and independent, and has adjustability in structural and mechanical properties, higher fracture resistance, higher elastic modulus and longer fatigue life; the characteristics of portability, attractiveness, good biocompatibility and the like of the existing dental composite material are maintained while the mechanical property is enhanced. The preparation method comprises the steps of stacking, dripping, calendering and curing. The preparation method is simple to operate and low in cost, and gradient type, alternating type and monotonous type multilayer dental composite materials can be prepared and obtained and are respectively applied to repairing molars and / or premolars, incisor teeth and / or canine teeth and caries in different positions.

The invention provides an underjaw premolar teeth residual root traction device, and relates to the field of orthodontic instruments. The device uses first molar teeth and second molar teeth at the same side as anchorage teeth and comprises two platy bottom plates, a steel wire, a buccal tube, an Niti wire, a thrust spring and a tongue side button; two opposite side surfaces of the platy bottom plates are connected by the steel wire; the buccal tube is arranged on the steel wire; an included angle between the side wall, parallel with the bottom plates, of the inner wall of the cavity of the buccal tube and a sagittal surface is 30-45 degrees; an included angle between the side wall vertical to the bottom plates and a crown-shaped surface is 45-90 degrees; the inlet end of the buccal tube faces an occlusion direction and the outlet end faces a root direction; one end of the Niti wire is connected with the tongue side button, the other end of the Niti wire penetrates through the buccal tube and is bent backwards, the thrust spring sleeves outside the Niti wire between the inlet end of the buccal tube and the tongue side button, the Niti wire is in a stretching state; the thrust spring is in a compressed state. The traction device can provide continuous correction force, effectively draws a residual root to the occlusion direction and is favorable for the recovery treatment of a post crown.

The invention relates to an auxiliary anterior tooth torque control device. The device comprises traction hooks, anterior tooth brackets, a clockwork spring seat and a traction seat, wherein each anterior tooth is fixedly provided with one anterior tooth bracket, the adjacent anterior tooth brackets are connected through a small ring curve, the clockwork spring seat and the traction seat are respectively fixed on the canine tooth and the second premolar tooth, the clockwork spring seat and the traction seat are connected through a square wire, the first molar and the canine tooth are respectively provided with one traction hook, and the two traction hooks are connected through a rubber chain. The auxiliary anterior tooth torque control device is small in force attenuation and continuous in acting force.