56 results about "Missed tooth" patented technology

The invention relates to a method and a system for improving oral cavity digital data fitting accuracy by using a noninvasive 3D modeling marking module. The method comprises the following steps: designing and obtaining a standardized marking module with a plurality of digital marking points on the surface through 3D modeling; non-invasively and reversibly adhering to the surface of an abutment which is used as an auxiliary reference system; the method comprises the following steps: acquiring oral cavity digital model data with a marking module after different intervention processing or in different data acquisition modes, detecting point-line-surface features of the marking module and preferentially matching, and default that corresponding data are overlapped and established in the same three-dimensional coordinate reference system to finish optimal fitting alignment; therefore, the digital data fitting accuracy of the oral cavity is improved; the marking module-assisted fitting method can be used for 1) comparing the accuracy of different digital data acquisition modes; 2) multi-unit temporary tooth data transfer errors are reduced; and (3) the acquisition error of the missing occlusion data of multiple teeth is reduced, so that the precise design of the target prosthesis is assisted.

The invention discloses a gear fault diagnosis method and system based on piezoelectric stress wave signal active sensing, and relates to the technical field of fault diagnos.A piezoelectric sensing unit is arranged on a tested gear, meshing impact stress waves are captured in real time in a single-to-periodic mode, and a fault diagnosis result is obtained. A high-resolution time-angle combined waveform is obtained through high-pass-envelope-angle domain interpolation, and transient energy imaging is achieved; rapid wave crest counting is executed, emergency faults such as tooth missing and tooth breakage are found instantly, comprehensive criteria are constructed according to absolute peak values, relative deviation and adjacent tooth comparison three-dimensional features, tooth-by-tooth mapping is carried out, and anomalies are marked; and fusing the abnormal tooth ratio and the average severity to generate a damage index, continuously tracking the evolution trend of the abnormal tooth ratio, automatically distinguishing early warning and progressive degradation, completing full life cycle monitoring from micro-crack to peeling under a non-stop condition, outputting emergency, early warning and degradation three-level prompts, and realizing early warning. And the operation and maintenance safety and economy of high-reliability scenes such as wind power and rail transit are improved.

The invention provides a dental implant robot path generation method. The method specifically comprises the following steps: constructing a tooth space pose vector; constructing a regression model for predicting spatial features of target missing teeth by combining spatial pose features of opposite-side homonymous teeth and upper and lower occlusal teeth, and predicting spatial positions and attitude angles of the target missing teeth; tCP calibration is carried out on the dental implant robot; carrying out TCF calibration on the dental implant robot; constructing a spatial transformation relation between an end effector of a mechanical arm of the robot and an external visual positioning system; constructing a spatial transformation matrix between the digital model and the entity printing model by adopting a point cloud registration technology; an initial obstacle avoidance path of the mechanical arm is constructed based on a fast expansion random tree sampling algorithm, and meanwhile, smoothing and speed regulation are performed on a joint track through polynomial interpolation and B spline curve interpolation in combination with an improved algorithm RRT *. According to the technical scheme, the problems that in the prior art, planting errors are large, and the fitting degree is not high are solved.

The application discloses a full-automatic tea picking and pruning integrated machine, which comprises a rack and a pruning unit arranged on the rack; the pruning unit comprises reciprocating staggered driving cutters and a plurality of pruning teeth arranged on the cutters; the pruning unit is horizontally slidably arranged on the rack, and a driving motor for driving the pruning unit to reciprocatingly slide is arranged on the rack; the driving motor is started to realize the horizontal reciprocating displacement of the pruning unit, so as to compensate for the pruning gap of the cutters in the tooth missing state; the detection circuit composed of the resistance rod, the wire and the elastic guide sheet is arranged in the pruning tooth, so that the number of broken teeth can be accurately positioned in real time and automatically, and then the controller drives the servo push rod and the motor to drive the whole pruning unit to move horizontally, so that the intact pruning tooth compensates for the pruning gap caused by the missing tooth.

The utility model discloses a complete denture teaching aid. An upper jaw bone and a zygomatic arch are integrally connected, and the upper jaw bone and a lower jaw bone are oppositely arranged at intervals; the upper false tooth is detachably connected with the upper jawbone, and the lower false tooth is detachably connected with the lower jawbone; the two telescopic pieces are fixedly connected to the side portion of the zygomatic arch and the side portion of the mandible respectively, and the fixed ends of the two telescopic pieces are connected to the periphery of the outer side of the zygomatic arch and the top of the outer side of the mandible respectively. The adjusting parts are arranged among the corresponding telescopic parts, the zygomatic arch and the mandible in a suspended mode, and the adjusting parts are fixedly connected with the movable ends of the corresponding telescopic parts respectively. The upper jawbone is integrally connected with the zygomatic arch and is arranged opposite to the lower jawbone at an interval, and the upper jawbone and the lower jawbone in a real oral cavity are simulated. The upper false tooth and the lower false tooth are detachably connected to the upper jawbone and the lower jawbone respectively and are used for simulating and replacing missing teeth. The stretching length and angle of the telescopic piece are controlled through the adjusting piece, and the relative distance and position relation between the maxilla and the mandible are adjusted, so that the alignment process of the maxilla and the mandible is displayed in real time.

The present application relates to the technical field of image data processing, in particular to a missing tooth shape intelligent reconstruction method based on contralateral tooth mirror image transformation. According to the patient's masseter axial ultrasound image and temporal muscle axial ultrasound image, the robustness of each side of the masticatory muscle of the patient's both cheeks is determined; the average wear degree of each side of the patient's both cheeks is measured, and then a regression equation of the average wear degree and the robustness is constructed; the coordination coefficient between the missing tooth side and the contralateral side of the patient is determined by using the regression equation, and then it is judged whether the contralateral homonym tooth of the missing tooth needs to be corrected; if correction is needed, the wear degree correction coefficient of the contralateral homonym tooth is constructed, and then the contralateral homonym tooth of the missing tooth is corrected, and the missing tooth shape reconstruction is carried out based on the corrected contralateral homonym tooth. The present application corrects the contralateral homonym tooth of the missing tooth, so that the missing tooth shape reconstruction is more consistent with the dynamic coordination of masticatory movement.

The application provides a three-dimensional implant crown intelligent selection and generation method based on U-Net, comprising the following steps: converting a three-dimensional tooth model in STL format into a high-resolution two-dimensional projection image; taking a U-Net network structure with VGG16 as a backbone network, combining a bar pooling module, and designing a neural network model for accurately capturing tooth sequential arrangement features; training the neural network model by using an adaptive learning rate adjustment strategy and a cosine annealing learning rate scheduling strategy, and performing semantic segmentation on the two-dimensional projection image to obtain a 2D tooth classification result image; identifying missing tooth labels based on the 2D tooth classification result image, calculating the center points of left and right adjacent teeth of the missing tooth, calculating the center position coordinates of the missing tooth in the 2D image through the center points of the left and right adjacent teeth, and mapping the center position coordinates to a three-dimensional space to obtain three-dimensional center coordinates of the missing tooth; and moving the template tooth center point to the three-dimensional center coordinates of the missing tooth to generate a three-dimensional crown model that matches the missing tooth position.

This invention belongs to the field of dental medical technology, specifically relating to an automatic positioning method, electronic device, and storage medium for dental template teeth. The method includes: acquiring a patient's dental arch model, the cervical margin of a restoration, and a template tooth model; determining the dimensional characteristics of the template tooth; performing preliminary overall matching of the template tooth; extracting the tooth portions from the dental arch and fitting a dental arch curve; calibrating the position and size of the template tooth based on the dental arch curve, including determining the target position and orientation of the restoration based on the cervical margin and the dental arch curve for restored teeth, and determining and locating the missing tooth based on the projection of adjacent restorations, and scaling it according to the morphology of the cervical margin or the arc length of the missing tooth interval. This invention achieves precise initial positioning and adaptation of the template tooth through an automated algorithm, solving the problems of cumbersome and inefficient manual positioning in existing technologies.

The application relates to the technical field of image processing, and provides a tooth detection method and device, a terminal device and a readable storage medium, the method comprising the following steps: acquiring a CT image of a patient's oral cavity and preprocessing the CT image to obtain a three-dimensional tooth region image; performing post-processing by using a tooth detection model to obtain a tooth detection result of the patient; wherein the tooth detection model comprises a full-tooth segmenter, a tooth crown and root segmenter and a tooth crown classifier; when the post-processing is performed, the three-dimensional tooth region image is input into the full-tooth segmenter to obtain a full-tooth segmentation result; the full-tooth segmentation result and the CT image are input into the tooth crown and root segmenter to obtain a tooth crown and root segmentation result; and then the tooth crown and root segmentation result and the CT image are input into the tooth crown classifier to obtain a tooth crown classification result. The method can accurately obtain tooth segmentation information and missing tooth position information of the patient, and has high calculation speed.

The utility model relates to the technical field of plastic film cutting tools, and discloses a plastic film cutting tool which comprises a machine shell, a film containing groove is transversely formed in the machine shell, a blade groove is formed above the film containing groove, and a T-shaped cutting knife is inserted into the blade groove. When a plastic film needs to be cut, the plastic film penetrates through a film containing groove, then a pressing rod is pressed downwards, in the downward moving process of the pressing rod, an L-shaped baffle and a pressing plate are firstly extruded through a second spring, the pressing plate is made to press and fix the plastic film needing to be cut, and at the same time, when the pressing rod moves downwards, a second tooth groove moves downwards to drive a special-shaped gear to rotate; the special-shaped gear rotates to drive the T-shaped cutting knife with the first tooth groove formed in the other side to move upwards, when the special-shaped gear rotates to the tooth-missing part to make contact with the first tooth groove, the T-shaped cutting knife rebounds downwards rapidly under extrusion of the first spring, and therefore the plastic film is cut through vertical vibration of the T-shaped cutting knife.

The shapes and sizes of teeth are greatly different in different crowds, and in addition, the problems of crowding, missing, overlapping and the like also exist, so that the complexity of tooth positioning is increased. At present, tooth segmentation and positioning are mainly based on tooth X-ray films, and shooting of the X-ray films in remote areas with backward medical resources is limited. In order to solve the above problems, a deep convolutional neural network is planned to be used in the research, and teeth are positioned and classified based on intraoral images. The method comprises the following steps: firstly, preprocessing a collected data set to improve the capturing capability of important features; secondly, a mixed attention mechanism is introduced into the project, and important information in feature maps of different scales is accurately captured; and finally, the convergence and generalization ability of the model are improved through a residual module. The specific innovation points are as follows: 1, a mixed attention mechanism is introduced into a basic framework based on U-Net + + to dynamically adjust the weight of each feature map in the network; 2, the low-level features and the high-level features are connected by adopting skip connection, so that the problem of local information loss possibly caused by the low-level features and the high-level features can be solved;

The invention provides a method and device for guiding a mechanical arm trolley and a dental chair to position and related equipment. An infrared binocular camera is used for recognizing the change of an array at the tail end of a mechanical arm so as to convert the change into the position change of the mechanical arm trolley; the change of the mouth clamp array is recognized by using the infrared binocular camera, the position change of the target tooth missing position of a patient can be obtained through dental jaw registration, the position change is further converted into the change of the position and angle of the dental chair, and finally, an operator is guided according to the preset relative position relation between the mechanical arm trolley and the dental chair. Compared with the prior art, the method provided by the invention has the advantages that the operator can be graphically guided to place the trolley and the dental chair in reasonable positions in the intraoperative software after calibration and registration are completed, the operator only needs to operate according to the guide whether the operator is skilled or not, and the whole operation process can be smoothly completed after the trolley and the dental chair are placed according to the guide. Meanwhile, the method provided by the invention can reduce the operation time.

The invention relates to the technical field of forensic dental medicine and restorative dentistry, and discloses an artificial intelligence-driven defective tooth automatic restoration and reconstruction method, which comprises the following steps: S1, collecting a human real tooth model and collecting a corresponding two-dimensional image and a three-dimensional model to obtain an original data set; s2, processing the original data set by using a traditional image processing method to obtain an enhanced data set, and randomly dividing the enhanced data set into a training set, a verification set and a test set in a ratio of 8: 1: 1; and S3, constructing a tooth restoration and reconstruction network structure, wherein the overall network structure comprises three sub-networks: a tooth image restoration network, a tooth image preprocessing network and a tooth three-dimensional reconstruction network. According to the method, the repairing process of the defective teeth is simplified, manual participation is reduced, and the tooth repairing process is more intelligent, so that the repairing efficiency is remarkably improved, and meanwhile, the requirement for diagnosis experience of doctors is also reduced.

This application provides a protective dental crown, comprising: a dental crown; and a retaining ring detachably connected to the side of the dental crown. The dental crown is fitted onto a target tooth for protecting missing teeth in elderly comatose patients. The retaining ring is fitted onto teeth surrounding the target tooth to secure the dental crown. Applied to comatose elderly patients, the crown covers the missing tooth, and then a retaining ring of appropriate size is fitted onto the patient's healthy teeth to secure the crown. This isolates the defective tooth, preventing contact with oral tissues and complications such as oral ulcers. The solution is simple to operate, convenient to use, and inexpensive, facilitating its widespread adoption.

The present application relates to the technical field of intelligent lamp mirror, especially to a kind of intelligent lamp mirror for children washing, including mirror module, internal monitoring camera and teeth cleaner, the teeth cleaner is provided with cleaning groove, multiple hardness controllers and multiple cleaning brushes.The present application controls the neatness of cleaning brush by hardness controller, thereby realizing dynamic regulation of friction force, while preventing excessive wear of enamel when removing stubborn stains.On the other hand, the neatness of cleaning brush can be reduced at the missing teeth by hardness controller according to the missing teeth in user's oral cavity, to reduce the irritation to gums at the missing teeth, thereby improving the comfort of cleaning teeth.The present application realizes the functions of monitoring and cleaning, and overcomes the problems of uncontrolled force of traditional teeth cleaning tools, resulting in unsatisfactory cleaning effect and damage to teeth and gums.

The present application relates to a kind of high toughness large-span floor, to solve the current unreliable connection between floor, affect the technical problem of later use, including floor body and multiple reserved holes, multiple The reserved hole is set to the outer wall of floor body, and multiple The reserved hole penetrates floor body, further include pouring joint, the pouring joint is set to the two sides of floor body, the inner wall of pouring joint located at the two sides of floor body is equipped with first misaligned tooth and second misaligned tooth, Misaligned tooth is set on the first misaligned tooth and second misaligned tooth, adhesive is filled into pouring joint by pouring port, the contact area of misaligned tooth staggered arrangement is increased with adhesive, while adhesive can be inclined plane and flow hole in pouring joint quickly flow, so that adhesive quickly fills entire pouring joint, the setting makes that adjacent floor body can be quickly and closely connected by pouring joint, improve the reliability of connection between floor body.

The invention relates to a method for measuring an alveolar bone of a missing tooth, which comprises the following steps of: a, controlling a sagittal axis to coincide with a central connecting line of cross sections of two adjacent teeth of the missing tooth on an axial plane, controlling a vertical axis to coincide with a connecting line of adjacent glaze cementum boundaries of the adjacent teeth on a sagittal plane, and controlling the sagittal axis to coincide with a tooth long axis of the adjacent teeth on a coronal plane, the coronal axis is controlled to coincide with the perpendicular line of the midpoint of the connecting line of the glaze cementum boundary of the adjacent tooth on the axial surface or the sagittal surface, the obtained coronal plane is determined as a measuring plane, and the sagittal axis, the perpendicular axis and the coronal axis are always kept in a mutually perpendicular state; and b, obtaining the width and height of the alveolar ridge of the missing tooth based on the measurement plane in the step a. The method for measuring the alveolar bone of the missing tooth has the advantages of being accurate in fixed point, small in measurement result difference, good in stability and high in repeatability.

The utility model relates to the technical field of stem cell culture, in particular to a water bath constant-temperature incubator which comprises a heat preservation box, a sliding frame, a spline shaft, a missing gear, a fixing frame and a pushing mechanism. A heating assembly is arranged in the heat preservation box, and a box cover is arranged on the heat preservation box. The sliding frame is arranged in the heat preservation box, a supporting plate is arranged on the sliding frame, a rotating disc is rotationally arranged on the supporting plate, a plurality of containing holes are formed in the rotating disc, the rotating disc is coaxially connected with a fixing shaft, and the fixing shaft is coaxially connected with a bevel gear A; the spline shaft is rotationally connected with the heat preservation box and provided with a bevel gear B, and the bevel gear B is meshed with the bevel gear A; the missing gear is coaxially and rotationally connected with the fixed shaft; the fixing frame is arranged in the heat preservation box, two racks are oppositely arranged on the fixing frame, and the missing gear is alternately meshed with the racks on the two sides; the pushing mechanism is arranged in the heat preservation box. According to the utility model, the operation of oscillation and rotation transposition of the culture dish is completed through a group of driving components, and air can be prevented from entering the heat preservation box when the culture dish is taken and placed.

This application provides a chain-type removable denture, relating to the field of dentures. It includes artificial teeth mounted on a base, with one artificial tooth corresponding to one base. Adjacent to one artificial tooth is another artificial tooth or a dental sleeve. The base fits snugly against the missing tooth, and the dental sleeve fits snugly over the outside of the abutment tooth. Connectors are provided on both sides of the artificial teeth and both sides of the dental sleeve. A pin is detachably inserted between adjacent connectors. Multiple artificial teeth and dental sleeves are connected sequentially or alternately in a chain-like manner. This application has the advantage that if the user's abutment tooth falls out again, only the corresponding dental sleeve needs to be replaced with an artificial tooth, resulting in minimal structural changes to the overall denture, reducing replacement costs for the user, and shortening the adaptation time to the new denture.

The invention relates to the technical field of image data processing, in particular to a missing tooth form intelligent reconstruction method based on contralateral tooth mirror image transformation. According to a masseter axial ultrasonic image and a temporomuscle axial ultrasonic image of a patient, the robustness degree of masticatory muscles on each side of double cheeks of the patient is determined; the method comprises the following steps: measuring the average wear degree of each side of double cheeks of a patient, and then constructing a regression equation of the average wear degree and the robustness degree; determining a coordination coefficient between an edentulous side and an opposite side of the patient by utilizing the regression equation, and further judging whether the homonymous teeth on the opposite side of the edentulous side need to be corrected or not; and if correction is needed, constructing a wear degree correction coefficient of the opposite-side homonymous teeth, further correcting the opposite-side homonymous teeth of the missing teeth, and performing missing tooth form reconstruction based on the corrected opposite-side homonymous teeth. According to the method, the same-name teeth on the opposite side of the missing teeth are corrected, so that the form reconstruction of the missing teeth better conforms to the dynamic coordination of chewing movement.

One embodiment of the present invention provides an apparatus and method for accurately segmenting a tooth image using artificial intelligence technology in a tooth diagnostic device. An apparatus according to one embodiment of the present invention includes: a database storing a hybrid data set comprising a plurality of disclosed tooth images and a plurality of undisclosed tooth images; and a control unit that generates a tooth segmentation image by segmenting at least one tooth in one tooth image included in the hybrid data set through a Seg-CSAB segmentation model, and generates a tooth analysis image by marking the location of the missing tooth on the tooth segmentation image through a missing tooth location prediction module.

The application discloses a kind of intelligent repair method and device for defective crown based on global and local double constraints, it is related to computer-aided oral prosthetics and artificial intelligence cross technical field, the method comprises: obtaining the point cloud of defective crown of patient;With the point cloud of defective crown as input, the complete point cloud of missing teeth is predicted by point cloud completion network based on deep learning architecture, and the predicted tooth point cloud is obtained;With the predicted tooth point cloud as input, the surface of the missing tooth is reconstructed by the surface reconstruction network of deep learning, and the predicted tooth surface is obtained;Wherein, the point cloud completion network and surface reconstruction network are both trained with double constraints, including local constraint and global constraint.The application can reduce the dependence on professional experience of oral technician, reduce the cost of artificial modeling, and improve the overall repair accuracy.

The invention relates to a multi-modal missing tooth positioning method based on a random forest. The method comprises the following steps: S1, acquiring oral cavity CBCT image data; s2, obtaining a tooth number set and a missing tooth number set of the actual dentition; s3, determining an adjacent tooth of one missing tooth in the missing tooth number set through a preset first mode and a preset second mode, if the adjacent tooth meets a prediction condition, executing S4, otherwise, returning to S3 until all elements in the missing tooth number set are traversed; s4, calculating actual centroid coordinates of adjacent teeth; s5, obtaining a missing tooth centroid prediction model; s6, obtaining an actual centroid coordinate of the missing tooth; and S7, traversing all elements in the missing tooth number set. Compared with the prior art, the method has the advantages of coping with complex challenges caused by deletion of multiple teeth and the like.

1. Name of the product in this design: One-piece ceramic implant. 2. Purpose of this design: To provide support and fixation for the restoration of missing teeth by surgically implanting it into the maxilla or mandible, for the restoration of damaged teeth, and to replace missing teeth. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The present application relates to the field of screw detection, especially to a screw tooth opening automatic detection device, a gantry loaded with a plurality of screw driving manipulators is arranged on the upper part of the machine table, a material guide frame is arranged on one side below the screw driving manipulators to provide materials, and a plurality of detection barrels are arranged on the other side to realize detection work. In the present application, after the screw is screwed into the detection barrel, a closed cavity is formed with the detection barrel, and the screw tooth surface extrudes the detection probe. When the missing tooth part enters the arc cavity, the chamber volume increases, the air pressure decreases, and the pressure sensing module is triggered to unlock the valve ball through the electromagnetic mechanism. When the detection probe extends into the missing tooth part, the valve ball moves synchronously with the probe to open. Under the action of continuous airflow, the pigment is sprayed out of the detection probe by negative pressure, the defective part is automatically detected and marked, and the automatic detection function of the screw tooth opening is realized.

The utility model relates to a kind of guided pipe mouth aligner, belong to pipe installation technical field, including guide bracket, two groups of mouth aligning components are symmetrically fixedly connected in the both ends of the guide bracket, and two groups of mouth aligning components are connected by several mouth aligning top-thread steel plates between, two adjusting screw rods are threadedly connected on each mouth aligning top-thread steel plate, and each adjusting screw rod is threaded through mouth aligning top-thread steel plate, each group of mouth aligning components includes openable and closable upper fixed ring and lower fixed ring, and the guide bracket is fixedly connected with lower fixed ring side wall.The utility model can adjust the misaligned tooth of pipe mouth, ensure the accuracy of pipe mouth, and also can prevent pipe displacement when operating, ensure the stability of installation process, fundamentally improve the quality, safety and efficiency of pipe installation.

A method and a system for generating a three-dimensional crown surface for replacing a missing tooth are disclosed. The method comprising: detecting the missing tooth from a digital three-dimensional representation of a mouth using a first artificial intelligence model; and using a second artificial intelligence model, generating a three-dimensional crown surface for replacing the missing tooth taking into account one or more of a dental preparation, margin line, occlusion, the gap between the preparation and adjacent and opposing teeth.

The application discloses a kind of digital production methods of activity instant restoration, it is related to denture repair technical field, to solve the technical problem that current activity instant restoration processing and production highly depend on personnel skills, process is complex and low in efficiency and precision is difficult to control, the method integrates intraoral scanning, CAD computer aided design, CAM cutting processing and 3D printing technology, carries exclusive algorithm and corresponding formula such as oral three-dimensional data reconstruction algorithm, base plate adaptive design algorithm, CAM tool path intelligent optimization algorithm, forms the whole process closed loop of "data acquisition-design optimization-fitting verification-precision cutting-finished product detection";The application realizes restoration full digitalization, intelligent preparation, improves processing precision and efficiency, reduces artificial dependence, adapts to different missing tooth scene, and can be widely applied to oral instant repair field.

The invention relates to a computer-implemented method for restoring a 3D digital defective tooth model of a tooth of a patient. The 3D digital defective tooth model is missing one or more tooth sections. The method comprises receiving a 3D digital teeth model of at least a part of a dentition of a patient comprising the 3D digital defective tooth model. A 3D digital supplemented tooth model of the tooth of the patient is generated. The generating of the 3D digital supplemented tooth model comprises supplementing the 3D digital defective tooth model with one or more filling tooth sections used to fill one or more of the missing tooth sections.

The utility model discloses a kind of dentition loss supports, including base, clasp and false tooth;False tooth is located on base, base is used to wrap alveolus at missing tooth place, and base is multiple, and elastic rod for conforming to inner wall of alveolus is connected between any two adjacent bases, and base is equipped with clasp for wrapping and fixed to the outer periphery of abutment tooth;The outer edge of base is equipped with sealing rubber ring for conforming to alveolus.The utility model, by the design of elastic rod and clasp, let user be more stable, comfortable when wearing the dentition loss support, adapt to the small deformation of user's oral cavity;And base outer edge is equipped with sealing rubber ring, can reduce food residue, saliva into alveolus.