82 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.

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.

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.

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.

Disclosed is a method for filling a root canal in a tooth. The method includes positioning a fiber in the root canal of the tooth, filling at least a portion of the root canal with an unset hydrogel composition, such that the unset hydrogel composition contacts at least a portion of the fiber, setting the hydrogel composition, thereby forming a set hydrogel, and removing the fiber from the set hydrogel, thereby leaving a channel in the set hydrogel. Methods and kits for repairing teeth are also described.

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 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 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.

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.

The invention relates to a preparation method and application of a dental pulp and dentin complex. The preparation method of the dental pulp and dentin complex comprises the following steps of: primary culture and subculture of dental pulp cells; preparing a liquid-phase concentrated growth factor; and mixing the cultured dental pulp cells with the liquid-phase concentrated growth factor to obtain a mixed material. Therefore, the dental pulp and dentin complex structure is prepared, and regeneration of dental pulp tissue is effectively promoted. According to the preparation method and application of the dental pulp and dentin complex of the invention, the autologous dental pulp cells and liquid-phase concentrated growth factor are mixed to be used as a young permanent tooth pulp tissue engineering scaffold, so that continuous growth of tooth roots can be promoted, and pains of patients can be relieved; the non-immune material is taken, the ectopic dental pulp-like tissue can be generated by transplantation of the dental pulp stem cells, the quantity of transplanted cells can be controlled, cell subgroups with the best potential effect on regeneration of the dental pulp and dentin complex can be screened, dental pulp regeneration is promoted, and dental pulp activity is recovered; and the liquid-phase growth factor can accelerate the wound healing process, and tissue regeneration is facilitated by stimulating cell proliferation and differentiation and promoting stem cell migration.