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96 results about "Molar" patented technology
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The molars or molar teeth are large, flat teeth at the back of the mouth. They are more developed in mammals. They are used primarily to grind food during chewing. The name molar derives from Latin, molaris dens, meaning "millstone tooth", from mola, millstone and dens, tooth. Molars show a great deal of diversity in size and shape across mammal groups.
Molar trimming prediction and validation using machine learning
Provided herein are systems and methods for determining if a 3D tooth model requires trimming or removal of incomplete or missing data (e.g., gingiva covering a portion of a tooth such as a molar). A patient's dentition may be scanned and / or segmented. Raw dental features, principal component analysis (PCA) features, and / or other features may be extracted and compared to those of other teeth, such as those obtained through automated machine learning systems. A classifier can identify and / or output probability that the 3D tooth model requires trimming. Trimming of the 3D tooth model can be implemented without human intervention.
Owner:ALIGN TECH
Device for collection and assay of oral fluids
InactiveUS20070116597A1Low volumeRisk minimizationBioreactor/fermenter combinationsBiological substance pretreatmentsParticulatesAssay
Owner:ORASURE TECHNOLOGIES
Dental distractor
InactiveUS20090186314A1Shorten the timeLess forceArch wiresBracketsOsteogenesis distractionFour component
This invention comprises an orthodontic dental distractor for rapid orthodontic tooth movement, particularly into a fresh extraction socket. The rapid movement can occur from the effect of distraction osteogenesis.The device can include four components: a molar tooth band with buccal tube, a canine tooth band with buccal tube, a threaded screw, and a screw retaining clip. The threaded screw is engaged internally to the molar band tube which is threaded internally. The screw head bears externally on the anterior (mesial) end of the clip, and the clip bears externally on the canine band tube so that when the screw is turned the canine tooth moves distally toward the molar tooth. Thus the movement of a tooth can be controlled to proceed at a rapid and prescribed rate.
Owner:POBER RICHARD
Apparatus for correcting position of teeth
InactiveUS20100047732A1Efficient use ofImprove applicabilityArch wiresDental toolsBone tissueDistofacial
Disclosed herein is an apparatus for correcting the position of teeth used in dentistry. The apparatus for correcting the position of teeth is constructed in a structure in which an implantation unit is securely fixed to a palate, e.g., the roof of a mouth, the bony tissue of which is very excellent and the soft tissue thickness of which is small, using a fixing source, opposite suspension parts are suspended by opposite buccal molar areas to draw front teeth backward, whereby the movement of teeth at the molar tooth areas is prevented, and therefore, reimplantation is unnecessary, application points for drawing the front teeth, including the molar teeth, backward are located at the buccal molar areas, whereby the application of a force (a correction force) is easy, it is possible to induce natural extension of a dental arch (an arch-shaped area where teeth are implanted), and the teeth are moved backward to correct the irregularities of teeth, whereby it is possible to considerably reduce a possibility of tooth extraction.
Owner:PARK HYUN SANG
Universal non-custom dental tray having anatomical features to enhance fit
ActiveUS8277215B2Enhance anatomical fitBetter conformGum massageTeeth fillingEngineeringAnatomical feature
Owner:ULTRADENT PROD INC
Method for measuring transverse and longitudinal inclinations of teeth
ActiveCN105030364AAccurate locationHigh accuracy of resultsDentistryRadiation diagnostics for dentistryDimensional simulationModel reconstruction
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.
Owner:SOUTHERN MEDICAL UNIVERSITY
Mandibular attachment for correction of malocclusion
Mandibular attachment structure, devoid of elastomeric member, for use in an orthodontic assembly having a force member connecting the mandibular and maxillar portions of the assembly and method of using the same. The structure includes bands dimensioned to encircle corresponding lower molars on opposite sides of the tongue, a single arched member connecting the bands and extending along a lingual side of the lower teeth, and threadless couplers each of which is affixed to a labial side of a corresponding band. Neither the structure nor the method require the use of an orthodontic brace to maintain a pressing connection between the structure and the rest of an orthodontic assembly. The pressing connection is maintained by cooperating a hook at the end of the force member and a hook at the end of a threadless coupler.
Owner:ZIEHMER T RICHARD
Molar appliance for an orthodontic brace
InactiveUS20080070183A1Improve directionImprove biteArch wiresBracketsMaxillary second molar toothEngineering
Owner:3M INNOVATIVE PROPERTIES CO
Unimpeded distalizing jig
ActiveUS20200163742A1Improving interdigitationIncrease spacingBracketsPosterior ToothBiomedical engineering
An unimpeded distalizing jig, comprising a pair of tooth bond pads, an intra dental arch telescoping assembly, comprising a rod-like insertion and a tubular shell, which constrains the rod-like insertion to move with respect to the tubular shell along an elongated axis, which may be a radial path; and a force generating structure configured to supply an off-axis distalizing force to the intra dental arch telescoping assembly, such that the distalizing force is provided to the posterior tooth substantially without applying an anteriorizing force on the anterior tooth. The force generating structure may be an elastic band fixed by a hook to the tubular shell on one side, and to a molar on an opposing dental arch on the other side.
Owner:SURIANO ANTHONY T +1
Molar fission molding pile-core and production method thereof
InactiveCN101385665AEasy to manufactureReduce mistakesDental implantsArtificial teethEngineeringRoot canal posts
The invention discloses a separate casting post core of a molar and a fabrication method thereof. The separate casting post core of the molar consists of a female post core and a male post core which are respectively provided with a root canal post at the lower parts thereof. The female post core and the male post core are respectively divided into a right separate body and a left separate body at the core body of the post core, and the joint face of the right separate body and the left separate body is inclined towards the female post core. The inclined angle of the joint face is equal to or larger than the inclined angle of the root canal post of the male post core. The female post core is provided with a groove with a larger upper part and a smaller lower part on the joint face, the male post core is provided with a protuberance with a larger upper part and a smaller lower part on the joint face, and the shape of the groove and the shape of the protuberance are matched. The separate casting post core has the advantages of simple and convenient processing, easy fabrication, easy installation and strong practicability. By using the female post core and the male post core respectively with a key way and a key, the standardization of the binding site between the female post core and the male post core can also be realized, and the fabrication process of the post core can be further simplified.
Owner:赵勇
Orthopedic-Orthodontic Molar Distalizer
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.
Owner:SPARTAN ORTHODONTICS INC
Correcting device and correcting method for traction and straightening of free-end impacted molars
PendingCN111419439AAvoid the risk of loosening and falling offLess surgical traumaAdditive manufacturing apparatusOthrodonticsMaxilla/MaxillaryImpacted molars
The invention discloses a correcting device and a correcting method for traction and straightening of free-end impacted molars. The correcting device comprises an anchor type hook, an elastic tractionpiece and a traction assembly, the anchor type hook comprises a sticking bottom plate, a connecting column and a plurality of traction hooks; one end of the connecting column is connected with the sticking bottom plate; the other end of the connecting column is connected with the plurality of traction hooks; the traction component comprises retention occlusal rests, cantilever arms and a connecting body; the retention occlusal rest is attached to a specified support tooth; the two cantilever arms extend out of the retention occlusal rests towards the far-middle direction; the two cantilever arms are respectively positioned on the buccal-lingual sides of a simulated eruption track of the impacted molar; each cantilever arm is provided with a plurality of suspension buttons; the connectingbody is positioned on the maxillary palate side or the mandibular lingual side; the connecting body is connected with the retention occlusal rests on two sides; one end of the elastic traction piece is connected with a traction hook; and the other end of the elastic traction piece is connected with the suspension buttons. The correcting device and correcting method are suitable for most free-end impediment molars, and particularly has obvious advantages for complex cases with low horizontal impaction and severe buccal-lingual inclination.
Owner:JINAN UNIVERSITY
Invisible tooth socket with traction accessory and manufacturing method of invisible tooth socket
PendingCN112089498ACause some damagesAvoid deformationArch wiresAdditive manufacturing apparatusMechanical engineeringMolar
The present invention discloses an invisible tooth socket with a traction accessory. The invisible tooth socket with the traction accessory comprises an invisible tooth socket body and further comprises a power rope, the tooth socket body is provided with a local protrusion, a bottom part of the protrusion is provided with a notch which is cut smoothly, one end of the power rope is fixed through the notch, and the other end of the power rope can be fixed to the other traction accessory or hung on an implantation nail, a tongue side buckle and a bracket. The present invention further disclosesa manufacturing method of the invisible tooth socket with the intermaxillary traction accessory. The manufacturing method sequentially comprises the following steps: (1) obtaining an accurate tooth jaw digital model through a predetermined method; (2) placing an accessory with a preset shape at a specific tooth surface by utilizing a software; (3) manufacturing a tooth socket body based on the tooth jaw model in the step (2); and 4) cutting a notch at a specific position of a bottom part of a protrusion on the tooth socket body in the step 3) by using a cutting tool. Through a combination of the tooth socket body and the power rope, 360-degree dead-angle-free traction can be realized, so that more possibilities are provided for invisible orthodontics, such as pushing molar teeth backwards,pulling buried teeth and the like.
Owner:深圳爱舒笑科技有限公司
Automatic recognition algorithm for feature points of tooth models based on local coordinates
ActiveCN107564094AEasy to handleFits the formal situationImage analysis3D modellingRecognition algorithmHuman error
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.
Owner:HANGZHOU MEIQI TECH CO LTD
Hyaluronic acid-containing pet molar rod composition as well as preparation method and application thereof
ActiveCN112189765ARich Hyaluronic AcidEliminate bad breathAnimal feeding stuffAccessory food factorsNutritionBiology
The present invention discloses a hyaluronic acid-containing pet molar rod composition as well as a preparation method and applications thereof. The hyaluronic acid-containing pet molar rod composition comprises meat powder and hyaluronic acid containing thallus crushing substances or salts thereof; the composition uses viscosity of hyaluronic acid and thallus crushing substances to replace starch, gel and other adhesives or forming agents, and after the molar rod is prepared, due to rich hyaluronic acid, the molar rod can inhibit bacteria, diminish inflammation, remove halitosis, protect gingiva and oral mucosa and also has the health-care effects of brightening hair and strengthening bones after being digested and absorbed, the unicity of the function of a traditional molar rod is improved, thalli are not removed in the preparation process, cost is saved, resources are fully utilized, and the molar rod has better nutrition and palatability; the effect of an adhesive can be achieved;and more importantly, the crushed thallus can form relatively hard particles after being dried, so that residues, tartar or dental plaque on the teeth of the pet can be effectively removed.
Owner:BLOOMAGE BIOTECHNOLOGY CORP LTD
Movable correction appliance for integral mesial moving of molar tooth
ActiveCN107411830AAesthetically pleasingWith comfortOthrodonticsIncreasing energy efficiencyRubber ringRetainer
The invention provides a movable correction appliance for integral mesial moving of a molar tooth, and belongs to the technical field of dental orthodontics. The movable correction appliance comprises a position fixing and connecting device, molar tooth band, an elastic rubber ring and a stopping board, wherein the position fixing and connecting device is manufactured by an orthodontic pressed film retainer high polymer material, traction hooks are welded to the molar tooth band and the elastic rubber ring, and the stopping board is arranged at the position of a missed tooth; and the stopping board at the position of the missed tooth is utilized to change the rotary center of the to-be-moved molar tooth, and the elastic rubber ring is utilized to enable the to-be-moved molar tooth (comprising a tooth root and a dental crown) to move to the mesiocclusion gradually one after another till the molar tooth is integrally moved to a destination position. The movable device is simple in operation, attractive in appearance and comfortable, can provide strong and forceful orthodontic anchorage, and thus the molar tooth is ensured to move integrally and efficiently.
Owner:王磊
Novel digestive molar rod for pet
InactiveCN112400733AGood removal effectPlay a buffer roleVeterinary instrumentsTaming and training devicesTeeth stainEngineering
The invention discloses a novel digestive molar rod for a pet, and belongs to the field of pet videos. According to the novel digestive molar rod for the pet, pressurizing blocks are arranged, friction blocks are uniformly and fixedly arranged on the outer surfaces of the pressurizing blocks, the friction blocks and shaping blocks are alternately arranged, so that the contact area between the molar rod and teeth is conveniently increased, tooth stains are conveniently removed from the teeth of the pet, cleaning blocks are arranged on the inner surfaces of the pressurizing blocks, the peripheries of the teeth of the pet can be effectively buffered, a proper amount of medicine is injected into a medicine reaction bin in an injection mode, in the biting process of the pet, through telescopingand extruding of telescopic parts, the medicine is extruded out to release balls through pressurizing shafts and is released into a mouth of the pet through the cleaning blocks, and therefore the health of the pet can be conveniently maintained in a guided mode.
Owner:李奎
Device for distally moving posterior dentition
PendingCN112914765AVertically lowerFlexible planting positionDental implantsOthrodonticsEngineeringDentition
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.
Owner:上海市口腔病防治院
Apparatus for dental irrigation
An apparatus for dental irrigation may be provided to project fluid onto the surfaces of, and the interproximal spaces between, a user's teeth and gum-line. The apparatus may comprise two hollow U-shaped manifolds having orifices located on their interior faces used as fluid jets. The manifolds may be connected, at a central point of reflection, by a rotating inlet joint which supplies the fluid flow. When placed in the user's mouth, the apparatus may be designed to receive the top and bottom sets of teeth in each corresponding U-shaped manifold, with orifices configured to provide fluid jets aligned towards the lingual and buccal side of the teeth. The orifices may be staggered to provide staggered fluid flow. A user's teeth may be cleaned with a controlled fluid flow by moving the apparatus in a sweeping motion between each set of rear molars.
Owner:EHT LLC
Orthodontic bracket with sliding molar distalizer
A sliding molar distalizer is provided. The distalizer features a canine attachment bracket, a molar tube, and a rod connected to the bracket and having an engagement end for engaging the molar tube. A hook formed on a portion of the rod receives an elastic for imparting distalization force directly on the distalizer towards the molar tube. An orthodontic tube formed on the attachment bracket holds an archwire that passes through premolar brackets. A buccal push flange lever is formed at a distal portion of the rod for imparting force on the molar tube.
Owner:SPARTAN ORTHODONTICS INC
Telescopic rod type malocclusion orthodontic appliance
The invention relates to a telescopic rod type malocclusion orthodontic appliance which is an orthodontic instrument for treating malocclusion. The telescopic rod type malocclusion orthodontic appliance uses a telescopic rod which can expand and contract, one end of the telescopic rod is connected on a molar of a maxilla, and the other end of the telescopic rod is connected on the molar of a mandible. The telescopic rod can expand or contract with opening and closing motions of the mandible. The telescopic rod is a device which can expand and contract in the longitudinal axial line and comprises an outer pipe and an inner rod, as well as at least two telescopic pipes. The outer pipe and the inner rod are distributed at the two ends of the telescopic rod, a mounting end is arranged on each of the outer pipe and the inner rod respectively, and a mounting circular hole is formed in each mounting end for connecting with accessories on the molars. The telescopic rod can change the position of the mandible of a patient to an appropriate position, thereby correcting the malocclusion.
Owner:INNOVATIVE MATERIAL & DEVICES
Pulp chamber approach pulp chamber opening guide plate
PendingCN111317585AMinimally invasive pulp openingPrecise openingNerve needlesBoring toolsPulp (tooth)Engineering
The invention discloses a pulp chamber approach pulp chamber opening guide plate which comprises a guide plate body, wherein tooth mold cavities are arranged on the guide plate body; positioning holesare also formed in the guide plate body; each positioning hole is used as a guide hole of a tooth pulp chamber of a molar tooth and a pulp chamber opening hole of a root canal orifice; the pulp chamber approach pulp chamber opening guide plate also comprises blocking edges arranged on the guide plate body; and the blocking edges are positioned on one side, far away from the tooth die cavities, ofthe guide plate body and extend along the edges of the positioning holes. The structure design of the guide plate is favorable for realizing precise pulp chamber opening and minimally invasive pulp chamber opening.
Owner:SICHUAN UNIV
User-customizable orthopedic alignment device with alignment gap
A user-customizable orthopedic alignment device (OAD) that includes a formable, generally semicircular mouthpiece which has an alignment gap that is generally in alignment with the user's canine teeth when the device is placed in the user's mouth. The OAD has an overmold of moldable material having portions that cover the user's molars and front teeth. The alignment gap is provided between rear (right and left) portions and the front portion to allow an alignment member to be positioned laterally between the user's canine teeth during molding of the overmold. A frame is provided to stiffen the OAD between the front and read portions. After the overmold has been molded to the user's teeth, inserts can be positioned in the alignment gap to provide cushioning between the canine teeth when the OAD is used. The inserts may be molded after they are inserted into the overmold assembly.
Owner:UECKERT GREGG EDWARD
Erecting auxiliary spring for impacted molar of lower jaw
PendingCN110916826ADoes not affect movementDoes not affect mobile requirementsArch wiresArch wiresMechanical engineering
The invention discloses an erecting auxiliary spring for an impacted molar of a lower jaw. The erecting auxiliary spring acts on an external surface of a tooth in cooperation with a tooth fixed corrective appliance and comprises an L-shaped tape-ring erecting auxiliary spring adaptive to a side face of the impacted molar, wherein a proximal end of the erecting auxiliary spring is bent into an elastic ring, and a distal end of the erecting auxiliary spring is bent into a hook which is adaptive to a primary arch wire. The impacted molar can be erected by a light force, the tape-ring auxiliary spring is adjusted in batches to carry out gradual stressing, and thus, the forward-tilting impacted molar is erected. Moving requirements of other teeth are not affected, the production is simple, theadjusting is easy, foreign body sensation is low, wearing is comfortable, and the erecting auxiliary spring is healthy and clean and is free of complications.
Owner:AFFILIATED STOMATOLOGICAL HOSPITAL OF NANJING MEDICAL UNIV
Method for establishing rat periodontitis model
The invention provides a method for establishing a rat periodontitis model, and belongs to the technical field of periodontology. The rat periodontitis model is established by injecting drugs into a plurality of rats to be modeled; the rats suffering from periodontitis are divided into a hard food feeding group and a soft food feeding group, hard food is fed to the rats suffering from periodontitis in the hard food feeding group, and soft food is fed to the rats suffering from periodontitis in the soft food feeding group; and maxilla specimens in molar regions at the two sides of the rats suffering from periodontitis are separated, and local tissues are scanned to confirm the establishment of a mechanical load composite model of the rats suffering from periodontitis . Through iconographicanalysis on to-be-modeled tissues of the rats, it is proved that the pathological change of the local periodontal tissues of the rats suffering from periodontitis is detected by changing the hardnessof the food, and the pathological process of clinical dentition defects accompanied by periodontitis affected teeth is fully simulated; and an innovative method is provided for designing and researching dentures of patients with periodontal diseases and dentition defects accompanied by the periodontal diseases.
Owner:XI AN JIAOTONG UNIV
Dental prosthesis
ActiveUS20200015947A1Falsifying natural appearanceEntailing economic disadvantageArtificial teethThin material handlingOral vestibuleDentures
A dental prosthesis is provided, manufactured from a monobloc or multibloc prosthesis blank (10), which is composed of a gum-colored material (14) and a tooth-colored material (12), which materials (12, 14) are bonded to each other by bonding, polymerization and / or one-piece manufacture. The boundary surface (16) between the materials is wave-shaped comprising alternating grooves (22) and ribs (24) in the course of the dental arch, and radial in an oral-vestibular direction in the region of the anterior teeth (33) to be created. The boundary surface (16), at least in the region of the molars (26)—again as viewed in the oral vestibular direction—has parallel grooves (22) and ribs (24) forming troughs and crests of the waveform, or grooves (22) and ribs (24) such that they extend in deviation from parallel by at most 10 degrees, in particular at most 5 degrees, at least in the region of the molars (26).
Owner:IVOCLAR VIVADENT AG
Personalized appliance for pulling molar to distal part
The invention provides a personalized appliance for pulling molar to distal part. The appliance comprises an anchorage assembly and a molar pulling assembly used for applying force to molar to be corrected, the anchorage assembly is connected to the molar pulling assembly, the anchorage assembly comprises a connecting piece and a plurality of retainers, the retainers are arranged on upper anchorage teeth and / or lower anchorage teeth respectively, and the molar pulling assembly comprises a positioning curve, a traction hook, a tongue side tongue buckle, a buccal side tongue buckle and an elastic tension piece. The appliance is accurate in correction and high in correction efficiency, the molar pulling assembly can apply pulling force to the molar to be corrected and move the molar towards the distal part, and the purpose of correction is effectively achieved.
Owner:南京精益义齿有限公司
Apparatus for dental irrigation
An apparatus for dental irrigation may be provided to project fluid onto the surfaces of, and the interproximal spaces between, a user's teeth and gum-line. The apparatus may comprise two hollow U-shaped manifolds having orifices located on their interior faces used as fluid jets. The manifolds may be connected, at a central point of reflection, by a rotating inlet joint which supplies the fluid flow. When placed in the user's mouth, the apparatus may be designed to receive the top and bottom sets of teeth in each corresponding U-shaped manifold, with orifices configured to provide fluid jets aligned towards the lingual and buccal side of the teeth. The orifices may be staggered to provide staggered fluid flow. A user's teeth may be cleaned with a controlled fluid flow by moving the apparatus in a sweeping motion between each set of rear molars.
Owner:EHT LLC
Retractor for rapid and distal movement of cuspids
Owner:WUHAN UNIV
One-piece molar-back-pushing device
The invention discloses a one-piece molar-back-pushing device. The device comprises: a pair of retention pieces, wherein a pair of the retention pieces is separately fixed at the palate side of dentalcrowns of molars at the two side of the oral cavity; a connecting body which is arranged between a pair of the retention pieces in a connection mode; traction hooks, wherein a plurality of the traction hooks comprise front traction hooks and side traction hooks, the front traction hooks are arranged on the connecting body, and the side traction hooks are respectively arranged on the retention pieces; at least one micro screw which is fixed at the palate part of the oral cavity and is positioned at the far middle side of the connecting body; and at least one connecting piece, wherein each connecting piece is arranged between one micro screw and one traction hook in a connection mode. The one-piece molar-back-pushing device is simple in structure and convenient to use, can push back molarsas far as possible within the physiological limit, can effectively overcome the defects of lip inclination of anterior teeth, cheek inclination of posterior teeth, tooth rotation and the like, and reduces the implantation number of micro screws.
Owner:PEKING UNIV SCHOOL OF STOMATOLOGY
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