40 results about "First molar tooth" patented technology

A method for measuring transverse and longitudinal inclinations of teeth includes the steps of 1, performing three-dimensional simulation model reconstruction; 2, selecting reference points, for a simulation model, drawing dental arch reference points FA and basal bone reference points AP at incisor teeth and first molars in left and right lower jaws in the simulation model, respectively; 3, establishing a coordinate system, defining a midpoint among four points FA31', AP31', FA41' and AP41' as an origin O of the coordinate system, defining a midpoint among four points FA36', AP36', FA46' and AP46' as a point Y, defining a line OY as an axis y, using a plane formed by a mesial contact point connecting to the incisor teeth in the lower jaw and mesial buccal cusps of the left and right first molars, as a plane xy, namely an occlusal plane; and 4, measuring transverse and longitudinal inclinations of teeth. The method has the advantages that observation is direct, detection is convenient and results are accurate.

The invention provides a mixed-dentition maxillary occlusal pad molar distal jet. The mixed-dentition maxillary occlusal pad molar distal jet comprises a fixed support component and a distoplacement component used for moving a first molar tooth to be displaced, wherein the fixed support component comprises a support base plate, a support adjacent hook I, a support adjacent hook II and a support hyperbolic lip bow; the distoplacement component comprises a displacement arrow clamp, a displacement base plate, a displacement buccal screw expander and a displacement palatal screw expander. The mixed-dentition maxillary occlusal pad molar distal jet can achieve the function of effective distal integral movement of the maxillary first molar tooth. The screw expanders are placed on an impedance center plane of the first molar tooth to be displaced, the force is gradually increased to finish distal movement correction of the first molar tooth to be displaced; the support base plate is stably bonded to a gum to provide the maximum anchorage force, so that unnecessary movement of other teeth is reduced.

The invention relates to a device for relieving buccal crossbite for a fixed type asymmetric occlusal pad combined casting crown. The device comprises an upper jaw portion and a lower jaw portion, wherein the upper jaw portion comprises an casting metal combined crown of a left / right side first premolar tooth to a first molar tooth or a second molar tooth of an upper jaw, a reversely placed Hyrax expansion screw and left / right side front and back palate rods; the lower jaw portion comprises a casting metal combined crown of a first premolar tooth on a lower jaw buccal crossbite side to a first molar tooth or second molar tooth of a lower jaw; the casting metal combined crown has hollow parts corresponding to cusps; and metal drawing hooks are respectively welded to cheek and tongue sides of the casting metal combined crowns of the first premolar tooth of the lower jaw and the first molar tooth of the lower jaw. The device has the advantages that the size is small, foreign body sensation is low, requirements on compliance of patients are reduced due to adhesion fixation, and a shaping effect is stable; a plurality of back teeth of the buccal crossbite are connected to one another integrally, and side effects of vertical tooth rising possibly caused by mutual elastics can be avoided; and widths of dental arches of the upper jaw and the lower jaw can also be harmonized by the device while buccal crossbite is relieved.

The invention discloses a U-shaped palate rod for invisible correction of a molar distal movement patient and a correction method. The U-shaped palate rod comprises two connecting bodies, two tractionhooks and a U-shaped palate rod body, wherein one end of each two connecting body is connected with the left and right first molar tongue sides of the upper jaw, and the other end of each two connecting body is connected with the two ends of the U-shaped palate rod body respectively; the connecting faces of the connecting bodies and the first molar tongue sides of the upper jaw keep away from thegingival margin by 2mm and keep away from the tongue tip by 2mm; the connecting faces wrap the mesial and distal parts of the first molar tongue sides of the upper jaw to increase the bonding area; abottom plate is subjected to gridding treatment; the U-shaped palate rod body is designed in the dental arch shape, and the palate mucosa is kept away from the U-shaped palate rod body by 2-3mm and does not make contact with the palate mucosa; and the two traction hooks are connected to the corners of the two sides of the front portion of the U-shaped palate rod body respectively and extend downwards and forwards. The U-shaped palate rod is used for stabilizing the rear tooth position during invisible correction of molar distal movement, the correction force can directly act on the upper jawmolars, molar mesial movement relapse is prevented, maximum adduction and congestion relief of the front teeth are facilitated, the correction efficiency is improved, the patient feels more comfortable, the correction efficiency is high, and the U-shaped palate rod is attractive and hidden.

The invention provides a two-dimensional maxillary molar moving device, and relates to the field of orthodontic instruments. The two-dimensional maxillary molar moving device comprises left and rightretention parts and a stressing part; the left and right retention parts are respectively arranged at the left and right sides of the palatal suture; the stressing part is connected with the left andright retention parts; each retention part comprises a metal crown covering the first molar, and a retention plate with a transverse groove in the middle; the metal crown and the retention plate are arranged at the same side of the palatal suture, and connected through a steel wire; the buccal side of the metal crown is connected to an implant nail sleeve corresponding to the maxillary zygomatic alveolar ridge; and two sagittal ends of the retention plate are respectively provided with stressing part installation holes. The retention parts in the invention can be appressed to the palatal mucous membrane to the most extent; a micro implant nail can be implanted in bone to the most extent; the failure risk in the stressing process of the micro implant nail can be reduced; and furthermore, ina correction process, the transverse enough width change of the maxillary can be realized without disassembling the micro implant nail.

The invention relates to an orthodontic assessment system, which comprises a lip discrepancy calculating unit, a center line discrepancy calculating unit, a space capacity difference calculating unit and a displacement assessment value calculating unit. The lip discrepancy calculating unit is used for calculating a first discrepancy, the center line discrepancy calculating unit is used for calculating a second discrepancy, the space capacity difference calculating unit is used for calculating a tooth space capacity difference value, the displacement assessment value calculating unit is used for calculating a displacement assessment value of a first molar tooth, a second molar tooth and a third molar tooth of o orthodontic patient according to the first discrepancy, the second discrepancy and the tooth space capacity difference value.

The invention provides an orthodontic kit and a manufacturing method thereof. The orthodontic kit is used for being placed in the oral cavity of a dental patient to carry out staged orthodontic tooth occlusion or orthodontic dentition; the orthodontic kit comprises a first-stage orthodontic tooth socket and a second-stage orthodontic tooth socket; the first-stage orthodontic tooth socket comprises a first-stage dental arch part, a plurality of first-stage anchoring groove positions and a plurality of first-stage matching groove positions which are arranged on the first-stage dental arch part, and the first-stage anchoring groove positions correspond to first molar teeth of the dental patient; the second-order orthodontic tooth socket comprises a second-order dental arch part, a plurality of second-stage anchoring groove positions and a plurality of second-stage matching groove positions, wherein the second-stage anchoring groove positions and the second-stage matching groove positions are arranged on the second-stage dental arch part; the positions of the second-stage anchoring groove positions are the same as those of the first-stage anchoring groove positions; and the second-stage matching groove positions move or rotate by taking the first-stage matching groove positions as references.

The invention relates to a device for distally moving a posterior dentition, which comprises a connector (1), an anchorage component (2) and a vertical control device, wherein the connector (1) comprises an annular body (11) and a buccal side connecting rod (12), the annular body (11) respectively covers a first molar and a canine and is connected with the first molar and the canine through the buccal side connecting rod (12), the anchorage component (2) is arranged on the buccal side and is connected with the connector (1), and the vertical control device is connected with the connector (1). Compared with the prior art, the device disclosed by the invention does not need bonding, and can prevent the extropion of teeth in the process of distally moving the dentition.

A long-arm type upright molar tooth spring includes a lingual groove rest, for resting the spring at a lingual groove of a first molar tooth; a loop, for surrounding and fixing the periphery of the second molar tooth; a buccal bracket rest, for resting the spring at a buccal bracket of the first molar tooth; a reactivating area, being an area between the first molar tooth and the second premolar tooth; a lever, for applying a force onto the second molar tooth; and an arc, extended from an adjacent wall between an engaging surface of the first molar tooth and an engaging surface of the second molar tooth, and fixed at a root of the second molar tooth.

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.

A device and method for performing orthodontic decompensation before orthognathic surgery without the aid of braces. The device includes an archwire coupled at either end to a band which is in turn adhered to the first molars of a patient. Disposed along the length of the archwire is a plurality of fixtures which may include a plurality of hooks that work in conjunction with elastics or other components used during the orthognathic procedure. The archwire is formed around the patient's teeth so as to be passive and maintain the patient's current orthodontic treatment progress. The device may be placed on either or both of the upper and lower teeth of the patient before the orthognathic procedure thereby ensuring that the teeth will not move during or after the surgery during the recovery process and that required surgical splints will still fit.

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 embodiment of the invention provides an impacted wisdom tooth removal model for teaching. The impacted wisdom tooth removal model comprises an oral maxillofacial region structure, a fixed adapter,an oral opening and closing control structure and consumables, the oral maxillofacial region structure comprises an upper jawbone and a lower jawbone, the rear end of the upper jawbone is rotatably connected with the rear end of the lower jawbone, a lower tooth set is arranged on the lower jawbone, and an upper tooth set is arranged at the bottom of the upper jawbone; the oral cavity opening andclosing control structure is movably connected with the mandible; the fixed adapter is fixedly connected with the oral maxillofacial region structure; the consumables comprise a mucous membrane layer,mandible impacted wisdom teeth, mandible first molar teeth and mandible second molar teeth, the impacted wisdom tooth removal model for teaching provided by the embodiment of the invention is used for physician training projects, after training is completed, the consumables can be replaced by screwing bolts, and convenience and quickness are achieved; the consumables are made of simulation materials, bones and teeth of the surgical operation consumables are close to the hardness of real tissues, the simulation effect is good, and the teaching quality of impacted wisdom tooth extraction can beeffectively improved.

The invention discloses a tongue side device for orthodontic maintenance and periodontal fixation splint and a manufacturing method thereof. An upper jaw part comprises a first retention part and a pair of first guide parts, wherein the first retention part is used for fitting the anterior maxillary teeth and the dental crown tongue sides of the maxillary canine teeth and the maxillary first molars on both sides of the anterior maxillary teeth; one end of each first guide part is connected to the part, close to the maxillary first molars, on one side of the first retention part, and the otherend extends to the occlusal surface of the maxillary first molars along the dental crown of the maxillary first molars; a lower jaw part comprises a second retention part and a pair of second guide parts, wherein the second retention part is used for fitting the anterior mandibular teeth and the dental crown tongue sides of the mandibular canine teeth and the mandibular first molars on both sidesof the anterior mandibular teeth; and one end of each second guide part is connected to the part, close to the mandibular first molars, on one side of the second retention part, and the other end extends to the occlusal surface of the mandibular first molars along the dental crown of the mandibular first molars. The tongue side device of the scheme is convenient for oral hygiene maintenance and clinical accurate positioning and bonding.

The invention discloses an impacted tooth three-dimensional control traction device, and relates to the technical field of orthodontic instruments, the impacted tooth three-dimensional control traction device is characterized in that an anchorage device is mounted on a to-be-used occlusal surface, and the anchorage device is connected with a to-be-used labial surface through a traction arm; molar casting belts are installed on the two sides of the base through supporting bows, the traction arm is installed on the base, the molar casting belts are installed on first molars or second molars on the two sides of the upper jaw of a to-be-used occlusal face, and the base is installed on the hard palate portion of the anterior tooth area of the to-be-used occlusal face. A fixing piece first end is further installed on the base plate, a turning ring is wound around a fixing piece second end, and a traction piece first end is connected to the outer side of the turning ring; the second end of the traction piece is installed on the lip face to be used through the tongue traction piece. The impacted tooth traction device can simultaneously perform traction on a plurality of impacted teeth without mutual influence, and the device is simple in preparation method and convenient for clinical operation.

The invention discloses a tooth malformation correction method, which relates to the technical field of tooth correction, utilizes a novel orthodontic material combination, mainly comprises a multi-effect wire, a 3D printing casting type TPA, a constant force tension spring, a TMA wire and a five-connection spring, and comprises the following steps: aligning teeth; removing the teeth designed to be removed in the scheme after 2-3 months; maxillary TPA is manufactured, the TPA is bonded to first molars on the two sides of the maxillary, the three-dimensional positions of the molars of the maxillary are stabilized, and therefore the anchorage of posterior teeth of the maxillary is enhanced; meanwhile, the upper and lower jaws use stainless steel wires to further stabilize the dental arch form, so that the dental arch is leveled, and good vertical control is performed; under the assistance of the TPA, the tooth extraction gap is closed through double-side sliding; and adjusting the occlusion relationship. The whole orthodontic process of the tooth extraction case is efficient and simple, the chair-side operation time is shortened, and the patient is relatively relaxed.

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 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 model building method comprises the following steps: step 1, firstly, taking two 25 # and 30 # lateral pressurizers with changed forms; step 2, anesthetizing the rats after anesthesia takes effect; 3, fixing the head of the rat; 4, expanding the molar clearance by using a lateral pressurizer with a changed shape; 5, taking the silk thread and winding the silk thread on a lateral pressurizer; step 6, knotting through silk threads; 7, knotting is conducted on the mesial surface of the first molar of the rat; 8, the stability is determined through a probe, and reinforcement is conducted; step 9, further using a lateral pressurizer to stimulate periodontium of the rat to coat porphyromonas gingivalis lipopolysaccharide; step 10, regularly observing a ligation position and coating porphyromonas gingivalis lipopolysaccharide after operation; 11, euthanasia is killed after observation is conducted for 8 weeks; and step 12, after euthanasia, detecting changes of periodontium of the rat before and after modeling through imaging scanning. The modeling method mainly overcomes the defect that threading is difficult in simple ligation modeling.

The invention provides a curving gap retainer, relates to the field of teeth, and provides the curving gap retainer. The device comprises a belt ring, a mesial tube, an arch wire and a loop, the mesial tube is fixedly connected to the mesial surface of the belt ring, the arch wire is bent into a plurality of U-shaped bends, and the bent part of the U-shaped bend in the middle of the arch wire is formed by bending the arch wire into a circle; and one end of the arch wire is arranged in the mesial tube. The retainer can be directly applied to the oral cavity and is very good in performance. The length of the whole small loop can be adjusted by adjusting the two small loops so that the small loop can adapt to odontoprisis gaps of different widths, the distal free end of the small loop is inserted into the first permanent molar mesial tube, and the mesial free end is inserted into the resin groove or the fixing piece groove. The tooth-missing gap can be effectively kept, and the mesial inclined first molar can be straightened. The design and manufacture are simple, the chair-side operation time is short, and the patient does not feel uncomfortable and is easily accepted. The invention is applied to the field of teeth.

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.

The invention relates to the technical field of orthodontics, in particular to an auxiliary device for molar distal movement. The problems that a traditional device for distally moving the molar is large in size, obvious in foreign body sensation, complex in manufacturing process, long in correction force period and poor in effect, and the side effect of front tooth lip inclination is often accompanied in the using process are solved. The auxiliary device for molar distal movement comprises a transmission rod and a stress application accessory, the transmission rod comprises a plurality of arch wire sleeves, a connecting rod, a traction hook and a lingual buckle, a buccal tube A is attached to a second molar, a buccal tube B is attached to a first molar, a bracket A is attached to canine teeth. The plurality of arch wire sleeves is arranged at the near-middle part of the buccal tube A, the near-middle part of the buccal tube B by 0.5 mm and the far-middle part of the bracket A, and the arch wire sleeve close to the bracket A is fixedly connected with a lingual buckle in the direction far away from gingiva.

The invention relates to a force application device and method based on invisible correction of a tooth extraction case. An anchorage is arranged on the palate, and a plurality of force application elements are arranged on the anchorage; traction is conducted on the two sides of the upper jaw invisible tooth socket through a force application element so as to apply lip and tongue side traction force enabling the upper jaw anterior teeth to adduct; traction is performed on the first molars on the two sides of the lower jaw through the force applying element to apply forward-leaning-resisting traction force for preventing the molars of the lower jaw from leaning forward; lip and tongue side traction force is applied to an upper jaw invisible tooth socket through anchorage, the traction force provides vertically upward pressing force and adduction force for the invisible tooth socket and upper anterior teeth, fitting of the tooth socket and opening of occlusion of the anterior teeth are facilitated, and the correction efficiency is improved; and traction force is applied to the first mandibular molars on the two sides through anchorage to stabilize the relation between the upper and lower molars and ensure that the mandibular molars do not incline forwards.

The invention discloses a novel maxillary arch expander for a bilateral cleft lip and palate patient and a correction method. The maxillary arch expander comprises a hyperbolic labial arch 1, an adjacent hook 3, an arrow clamping ring 4, a first spiral arch expander 5, a second spiral arch expander 6, a third spiral arch expander 7 and a Y-shaped splitting base support. The Y-shaped split base support comprises a front base support 81, a left base support 82 and a right base support 83 which are connected through a spiral arch expander. The Y-shaped split base support covers the palate part and the palate side of the dentition; two adjacent hooks 3 are respectively positioned between the left and right second premolar teeth and the first molar teeth and are fixedly connected with the Y-shaped split base support; the two arrow clamping rings 4 are located on the left first molar tooth and the right first molar tooth respectively and fixedly connected with the Y-shaped split base support. The hyperbolic labial arch 1 is positioned in a mesial anterior tooth region of the fracture and is fixedly connected with the Y-shaped split base support. According to the invention, the problem that the maxillary expansion of a patient with cleft lip and palate on both sides cannot control the anteroposterior process of the front jaw and the over-wide fracture at the same time is solved, the correction procedure is simplified, and the treatment time is shortened.

The invention relates to a jaw position recording tray and a method for determining a jaw position relation. According to the jaw position recording tray, the shape of the tray is matched with the oral cavity structure of an edentulous jaw patient; the tray comprises a base support and supporting tables which are respectively located at two sides of the base support; a tray handle connected with the base support is arranged at the front end of the tray; the tray handle is a flange inclining downwards and outwards; a supporting rod hole is reserved in a position, corresponding to the first molar of the upper jaw of the human body, of each supporting table; a screw joint mechanism is arranged in each supporting rod hole; and each screw joint mechanism is matched with a supporting rod with threads. The jaw position recording tray provided by the invention is reasonable in structural design, and can reduce the operation difficulty of a doctor for determining the jaw position relation during complete denture repair of the edentulous jaw patient. By using of the method for determining the jaw position relation through the jaw position recording tray provided by the invention, the jaw position relation can be determined by sequentially determining the plane, vertical distance and horizontal relations, and is easy in operation and accurate in jaw position recording.