85 results about "Pulp (tooth)" patented technology

A device for endodontic treatment simulation is described including: at least one physical tooth model including pulp chamber and root canals, manufactured by way of layered manufacturing or rapid prototyping techniques and corresponding to a real-life endodontic case. Methods and systems for designing and manufacturing the device are also described.

This invention relates to a negative pressure irrigation system including one or more negative pressure irrigation needles sized for insertion into a canal of a tooth, each needle having a closed distal end and two suction inlet ports located opposite one another immediately proximal to the closed distal end. The needles are placed in communication with a dental vacuum system by way of a suction manifold. An irrigant inlet tube supplies irrigant from a irrigant container into a pulp chamber or a tooth. The irrigant inlet tube may include a tapered end designed to tightly fit into a lateral irrigant supply port previously drilled into the pulp chamber. A light-cure polymer seals the inlet tube and needles when in use.

Systems and methods for using a liquid jet apparatus for dental treatments are disclosed. In one implementation, the liquid jet apparatus may include a handpiece configured to deliver a high velocity liquid jet to a desired location in the mouth of a patient. The handpiece may include a positioning member having a channel through or along which the jet can propagate. The positioning member may have a distal end portion configured to be at least partially disposed in a pulp cavity, canal space, or opening in the tooth under treatment. During operation, the jet may impact an impingement surface of the distal end portion of the positioning member and be deflected as a spray through one or more openings in the distal end portion. The liquid jet apparatus may be used for root canal treatments.

The invention relates to a method for preparing microcrystalline cellulose, and particularly relates to a method for preparing microcrystalline cellulose for toothpaste. The method comprises the following steps: by taking 150kg of purified cotton or 100kg of wood pulp as a raw material, hydrolyzing by adopting 46-52kg of 0.2-0.23mol / L diluted hydrochloric acid; adding 50,000mL of 30% hydrogen peroxide to bleach in the hydrolysis process; crushing by an ultrafine grinder after drying and primarily crushing, so as to obtain the microcrystalline cellulose. The microcrystalline cellulose prepared by the method is high in hygroscopic property, the viscosity is not greater, so the microcrystalline cellulose can not layer after the microcrystalline cellulose is dissolved into water, the whiteness is greater than 95, the mean grain size is smaller than 5 microns, the smaller the grain size is, the larger the specific surface is, the microcrystalline cellulose can be fully dispersed in the toothpaste, and the viscosity of the toothpaste is enhanced.

An apparatus for endodontic treatment, comprising: a nozzle connected to a fluid source comprising: a tip small enough to be inserted into a pulp chamber of a tooth; an inner geometry which forms a flow parameters including non-axial flow direction of nozzle fluid flowing through the inner geometry such that discharge fluid discharged from the inner geometry increase rotation of root canal fluid within a root canal sufficiently to remove tissue from the root canal.

The invention belongs to the technical field of transmission belt production and particularly relates to an edge-cutting double-sided transmission tooth-shaped tight-up belt product. The tight-up belt structurally comprises top fabric, a primer and transverse connection core ropes, wherein the primer comprises the following raw materials in parts by mass: 100 parts of rubber / plastic alloy hydrogenated nitrile butadiene rubber, 15-25 parts of poly-p-phenylene terephthamide pulp fiber, 8-10 parts of liquid carboxyl nitrile butadiene rubber, 13-20 parts of fumed silica, 45-55 parts of high-wear-resistant carbon black, 15-25 parts of semi-reinforcing carbon black, 1.5-3.0 parts of vulcanizing agent, 1.5-3.0 parts of accelerator, 5-9 parts of active agent, 1-5 parts of anti-aging agent and 2.5-6 parts of binder. The tight-up belt disclosed by the invention has the characteristics of high transmission efficiency, low elongation rate, tension-free maintenance and the like; the service life of the tight-up belt used on supporting equipment is more than 3 years; and the tight-up belt has relatively good promotion adaptability.

The invention provides a pulp capping agent for treating dental pulp lesions as well as a preparation method and application thereof. Bioactive particles release PO4<3-> ions in an oral environment topromote rapid deposition of Ca<2+> and PO4<3-> on the surface of the material, so that a mineralization layer is formed rapidly; the released metal ions and PO4<3-> play a neutralization role and thus the material has the stable pH value in the body fluid, so that the compatibility with the dental pulp cells is improved and the dental pulp cells are promoted to differentiate into the teeth. The dental pulp capping agent can be used in different ways based on different components. The pulp capping agent that is prepared by compounding of bioactive particles such as phosphosilicate glass, phosphosilicate ceramic and a restorative material causing polymerization covers the surfaces of teeth after being subjected to photo-induced polymerization and solidification, so that rapid formation of dental pulp and tooth tissues is induced and thus dental pulp lesions are treated. Moreover, the pulp capping agent prepared by including solid-phase powder and the liquid phase coats the surface of dental pulp uniformly to treat the dental pulp lesions.

During root canal procedures, pulp may be removed from a tooth without disturbing the dentin by directing pulses of a heated liquid onto the pulp at particular temperatures and pressures to liquefy or gellify the pulp. The liquefied or gellified material is then aspirated away using the methods and apparatuses described herein. In some embodiments the heated liquid also functions to kill bacteria that may be present within the tooth.

The invention relates to a degradable hydrogel for regenerating dental pulp and / or dentin. The hydrogel is characterized in that the hydrogel takes a reactant of chitosan and bis (4-formylbenzoic acid) polyethylene glycol ester as a support material, and the hydrogel also contains an epidermal growth factor (EGF) and interleukin-2. The hydrogel has a self-repairing function and can be conveniently injected into a dental pulp cavity to be treated, and repairing cells enter the dental pulp cavity and play a repairing role through the joint synergistic effect of the EGF, the interleukin-2 and the support material, so that diseased dental pulp and dentin are regenerated and repaired.

The invention discloses a mobile air conditioner paper holder package which comprises a supporting tray and a protective plate disc. The top end of the supporting tray is opened and provided with a containing cavity. A plurality of convex portions on the tray wall of the supporting tray are connected to be in a tooth shape. The center of the outer surface of the supporting tray is a flat face. Joints between the right wall of the supporting tray and the upper and wall walls of the supporting tray are provided with right-angle connecting ribs. Grooves are formed by the right-angle connecting ribs and the corners of the supporting tray. The top end of the protective plate disc is opened, and the center of the protective plate disc is provided with a through hole. A plurality of convex portions on the disc wall of the protective plate disc are connected to be in a tooth shape. The convex positions of the convex portions of the protective plate disc are on the outer surface of the protective plate disc. The paper holder product replaces a foamed plastic shockproof product and is feasible in using performance and product cost; in addition, the molded product of paper pulp has the advantages in the environmental protection aspect, so that the foamed plastic product is inevitably replaced with the molded product of paper pulp.

A tooth cracking device improves the efficiency of removal of pulp from extracted teeth. The device may have:a frame having a central open area; the frame having two opposed surfaces within the open area;on a first of the two opposed surfaces is an at least three-prong support;on a second of the two opposed surfaces, and opposed to the at least three-prong support is a tapered penetrating probe;wherein the tapered penetrating probe is controllably extendable from the second of the two opposed surfaces.

Methods, systems, and computer programs are disclosed for segmenting, from an image, a tooth's pulp region comprising a pulp chamber and root canals. Curvature-based shape recognition is performed at different spatial scales using smoothed versions of the image. An indication of a point or region is received, located in the pulp chamber and referred to as “seed”. The seed is used as initial segmentation mask. An update procedure, iteratively carried out, comprises: (i) determining candidate image elements for updating the segmentation mask, comprising: (i−1) in the first n iteration(s), a grayscale thresholding taking as reference the current segmentation mask; and, (i−2) in at least one iteration, taking the curvature-based shape recognition into account; (ii) retaining, among the candidate image elements, a region of connected candidate image elements that comprises the seed; and (iii) using the retained region to update the segmentation mask.

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.

This invention discloses a vitality-based photoplethysmography imaging (PPGI) system capable of determining the pulse frequency within the dental pulp, allowing for direct, accurate, real-time visualization of tooth vitality. The system comprises a transilluminating bitewing, capable of aligning and stabilizing a light source and an intraoral camera, which is operationally connected to a computing device that is equipped with video stabilization and digital signal processing algorithm (Pulp Assessment by Local Observation, i.e. PABLO) to assess pulp vitality via analyzing videos captured with the intraoral camera.

The invention relates to a tooth-profile-variable grinding disc for a cylindrical pulping machine. The grinding disc comprises 4-8 rotor grinding discs fixed on a rotor of the pulping machine and 4-8stator grinding discs fixed on a sliding block of a shell of the pulping machine. The grinding disc further comprises an inlet end, a pulping area and an outlet end, wherein the inlet end, the pulpingarea and the outlet end are all provided with grinding teeth and grooves, and the grinding teeth and the grooves at the inlet end, the grinding area and the outlet end are different in number, shape,width or cut-in angle. The grinding disc of the invention adopts grinding teeth and groove structures with various parameters such as variable shapes, widths, angles and the like, so paper pulp raw materials can enter the pulp grinding area, the comprehensive pulp grinding function of the grinding disc is enhanced, and pulping quality and economic benefits are improved.

The invention discloses a root canal debridement and disinfection bio-gum bio-material applicable to endodontics and a preparation method thereof. Bio-gum solution is prepared with sodium alginate, antimicrobial peptides, lysozyme and injection water as a carrier, in conjunction with sodium chloride that regulates osmotic pressure. The root canal debridement and disinfection bio-gum bio-material belongs to stomatology department and endodontics, is applicable to root canal lubrication, disinfection and washing, and is capable of removing residues at root canal, pulp tissue and other sites by washing, debriding and flushing wounds during oral surgery to promote wound healing, stopping bleeding and reducing exudation, stopping local bleeding of the oral cavity, stopping bleeding after toothextraction, and reducing exudation.

The invention provides a material and material box for separation, culture and storage of dental pulp mesenchymal stem cells. The material is composed of a dental pulp collection liquid, a cell culture medium, a cell culture auxiliary liquid, and a cell cryopreservation liquid, wherein the dental pulp collection liquid is composed of a tooth preservation liquid, a tooth cleaning liquid and a toothdisinfection liquid; the cell culture medium is composed of four reagents after mixing; the cell culture auxiliary liquid is composed of two reagents after mixing; and the cell cryopreservation liquid is composed of a first cell cryopreservation liquid and a second cell cryopreservation liquid, the first cell cryopreservation liquid is composed of MSCGM-CDTM BulletKit and Ultroser G according toa weight ratio of (1-10):1, and the second cell cryopreservation liquid is composed of DMSO and dextran according to a weight ratio of DMSO to dextran = 1:(0-2). The material does not affect viability, cell number, adipogenic induction, osteogenic induction and expression of surface markers of the dental pulp mesenchymal stem cells.

The invention discloses a tooth-protecting freeze-dried milk piece and a preparation method thereof. The freeze-dried milk piece is prepared by the following steps: heating raw milk, adding xylitol, whey protein powder and bean flour, performing homogenizing, sterilizing and cooling, adding zymophyte powder for fermentation, adding pulp, nut powder and compound bacteria powder, and performing pre-freezing and vacuum freeze-drying. According to the preparation method, by virtue of reasonable raw material components and proportion combined with a fermentation freeze-drying process, the prepared freeze-dried milk piece is balanced in nutrition proportion and easy to absorb, and has a good effect of preventing decayed teeth especially due to the synergistic effect of lactobacillus plantarum N3117 and lactobacillus paracasei in the nut powder and the compound bacteria powder.

A dental probe for determining the vitality of a tooth, comprising a light emitter and a light receiver, wherein the light emitter emits light from an emitter surface adapted to be positioned on a hard dental surface of a tooth, wherein the light receiver collects light incident on a receiver surface adapted to be positioned on a hard dental surface of the tooth so that the optical path of the light emitted from the light emitter passes at least through a portion of the pulp chamber of the tooth. The light receiver includes a light shielding spacer member adjacent to the optical path for establishing and maintaining a distance of at least 50 μm between the gum line and the optical path at the receiver surface. The light emitter further a light shielding spacer member adjacent to the optical path for establishing and maintaining a distance between the gum line and the optical path at the emitter surface, wherein the light shielding spacer member establishes and maintains a distance of at least 50 μm between the gum line and the optical path at the emitter surface, and in that an apical-coronal diameter of the light emitter surface and the light receiver surface is at most 1200 μm in the direction normal to the optical path.

The invention discloses an application of a fibrinogen gamma chain as a dental pulp dentin regeneration reagent, and provides a kit for promoting dental pulp dentin regeneration. The kit comprises thefibrinogen gamma chain as a growth factor for promoting odontoblast differentiation of dental pulp stem cells, can significantly improve an efficiency of the dentin differentiation of the dental pulpstem cells, provides a new method for promoting dental pulp dentin regeneration, and has a significant tooth regeneration effect.

The invention relates to a method for preparing a modified aramid pulp / PMMA composite material by supercritical carbon dioxide polymerization, which comprises the following steps: permeating MMA and an initiator corresponding to the MMA into aramid pulp under the carrying action of supercritical CO2, initiating MMA polymerization to obtain modified aramid pulp, and compounding the modified aramidpulp with PMMA to obtain the composite material. The tensile strength of the composite material is 47.83 to 63.52 MPa, the elongation at break of the composite material is 3.5 to 6.8 percent, and thebending strength of the composite material is 56.8 to 62.4 MPa. According to the method, the aramid pulp is modified by adopting supercritical CO2, MMA and the initiator, so that the aramid pulp can be well dispersed in PMMA, the content of the aramid pulp in PMMA is increased, the strength, wear resistance and the like of PMMA are favorably improved, and meanwhile, the method adopts an environment-friendly supercritical fluid technology for modification, does not introduce toxic solvents, and is suitable for tooth base material requirements.

The invention provides a plug-type post-core integrated crown suitable for the posterior tooth occlusal gingival restoration with a space less than 3 mm. The plug-type post-core integrated crown comprises a main body, a plug channel and a plug, wherein the main body comprises a crown part and a pulp cavity part, the crown part restores the shape and occlusal relationship of an affected tooth, andcovers and envelops a prepared body of the affected tooth, the pulp cavity part is located in a pulp cavity of the affected tooth, and matches the shape of the pulp cavity to obtain the retention force, and the plug passes through the plug channel of the main body and extends into a prepared post channel in the root canal to obtain retention. The plug-type post-core integrated crown suitable for the posterior tooth occlusal gingival restoration with a space less than 3 mm has the advantages of good retention, no need to adjust and grind a contralateral tooth, little damage, and good aesthetics, provides a good and novel restoration body used for the restoration of dental defects for such patients, and is especially suitable for the case that a posterior tooth restoration occlusal gingivalspace is too small to apply conventional crown restoration and post core + crown restoration.

The deciduous tooth pulp stem cell low-temperature preservation box comprises a bottom plate, a lifting mechanism is arranged on the upper surface of the bottom plate, a box body is arranged on the outer side of the lifting mechanism, the lower side of the box body is fixedly connected with the position, close to the side edge, of the upper surface of the bottom plate, and a preservation box body is connected to the upper side of the lifting mechanism. An opening matched with the preservation box is formed in the upper side wall of the box body, a mounting cavity is formed in the left side of the interior of the preservation box, a refrigeration mechanism is arranged in the mounting cavity, a storage cavity is formed in the right side of the interior of the preservation box, a placement frame is arranged in the storage cavity, and a plurality of test tube insertion openings are formed in the placement frame; the upper side of the storage cavity is provided with a cover body, the cover body is slidably mounted on the upper side of the storage cavity, the height of the storage box can be adjusted, so that the device is suitable for doctors with different heights, the doctors can work more conveniently, meanwhile, the refrigeration mechanism refrigerates the interior of the mounting cavity, and it is guaranteed that teeth are stored in a low-temperature state.

The invention provides a method for preparing transparent calcium phosphate bioceramics by normal-pressure sintering under atmosphere protection, and belongs to the technical field of biomedical materials. According to the method, high-purity nano hydroxyapatite (HA) and / or high-purity nano beta-tricalcium phosphate (beta-TCP) powder are taken as raw materials, no sintering auxiliary agent is added, steam is adopted for protection, and the transparent calcium phosphate biological ceramic with light transmittance of 50-95% can be obtained by multi-step normal pressure sintering under a condition of atmospheric pressure. The phase composition of the transparent calcium phosphate bioceramic is an HA single phase, a beta-TCP single phase or a HA / beta-TCP two-phase mixture. The method has simple process, small equipment investment and short production period, and can meet requirements of batch production. The obtained transparent calcium phosphate bioceramic has the advantages that relativedensity is more than 99.5%, crystal grains are uniform and fine, no impurity phase exists, and mechanical strength is high. The transparent calcium phosphate bioceramic can be used as a good matrix material for observing interaction among cells, tissues and calcium phosphate bioceramic, and can also be used in repair fields of tooth roots, dental pulp, artificial eyes and the like.

The invention relates to a production method of medical adhesive tape cotton paper with excellent comfort. According to the invention, low-polymerization-degree cotton pulp is adopted; defibering bya high-frequency defibering machine or defibering by adopting a disc mill for cutting off a tooth-shaped abrasive disc without adding a cutter; the material is mixed with double-component polyester fibers; wherein the absolute dry dosage of the cotton pulp is 60-85%; the dosage of the double-component polyester fibers is 15%-40%; the medical adhesive tape cotton paper is made by adopting an inclined wire former; and the manufactured paper is quantified to be 21-26g / m<2>, the tightness is 0.25-0.32 g / m<3>, the longitudinal tensile strength is 0.2-0.4 KN / m, the longitudinal elongation is more than or equal to 4%, the longitudinal and transverse tension ratio is (1: 1)-(1.5: 1), the air permeability is more than or equal to 600L / m<2>.S, and the water absorption is less than or equal to 15g / m<2>. The product has good bulk, moderate strength, high elongation, smooth and fine surface, high softness and good comfort, the phenomenon that chemical fibers adhere to a roller in the post-processing production process is avoided, and the finally produced medical adhesive tape has silk-like comfort.

In accordance with the present situations that clinically, the tooth preparation operation of porcelain laminate veneers of anterior teeth is high in difficulty, and tooth tissue is easy to excessively strip to cause dental pulp sensitivity, the invention relates to an individualized tooth preparation substep indicating guide plate manufactured by digital design. The individualized tooth preparation substep indicating guide plate manufactured by digital design is characterized in that the guide plate is designed and manufactured by a digital method, and is used for performing accurate tooth preparation on the porcelain laminate veneers of the anterior teeth, so that accurate dental hard tissue stripping can be realized in a substep manner, and the purpose of being minimally invasive is achieved. The substep guide plate is used for indicating tooth preparation through the three steps of: in a first step, indicating preparation of a cutting end and a neighbor surface with a neighbor surface cutting guide plate; in a second step, indicating labial side preparation with a labial side guide plate; and a third step, indicating gum edge preparation with a gum edge guide plate. According to the individualized tooth preparation substep indicating guide plate manufactured by digital design disclosed by the invention, accurate design is performed by the digital method, and then the toothpreparation is guided in the substep manner, so that the problem that the preparation capacity is insufficient or excessive cannot be generated, the operation difficulty of a clinician can be reduced,the clinical repairing quality and patient satisfactoriness are improved, and the individualized tooth preparation substep indicating guide plate is a beneficial attempt of an idea of accurate medical care in the field of mouth rehabilitation.