91 results about "Tooth wear" patented technology

The present invention relates to an excavating tooth for construction machinery and a method for replacing an excavating tooth of construction machinery. The excavating tooth is provided with a working end and a mountable end. The mountable end defines a means for receiving an adaptor mounted on a work tool. The working end defines a bore. A wear indicator is located within the bore and provided with a length that is less than an unworn length of the working end and a color that visibly contrasts with a color of the working end. As the excavating tooth is worn down during use, the wear indicator becomes visible to provide a visual indication of the need to replace the excavating tooth.

A gear and a method of making a forged powder metal gear having a plurality of teeth and a variable case depth profile forged in the plurality of teeth. Each tooth of the plurality of teeth has a first surface and a tooth root. A variable case depth profile is formed in each tooth of the plurality of teeth, whereby the variable case depth profile exhibits greater tooth wear resistance on the first surface and greater impact resistance in the tooth root.

A dentifrice composition comprising an abrasive system comprising at least one abrasive silica which may be selected from a first silica having a Radioactive Dental Abrasion (RDA) in the range 30 to 150 and a second silica an RDA in the range 100 to 300, and a crystalline aluminosilicate having an average crystallite size below 0.2 μm plus an orally acceptable carrier. The content by weight of the first silica being greater than that of the second silica and the RDA of the second silica being greater than that of first silica.

A method for detecting tooth wear using digital 3D models of teeth taken at different times. The digital 3D models of teeth are segmented to identify individual teeth within the digital 3D model. The segmentation includes performing a first segmentation method that over segments at least some of the teeth within the model and a second segmentation method that classifies points within the model as being either on an interior of a tooth or on a boundary between teeth. The results of the first and second segmentation methods are combined to generate segmented digital 3D models. The segmented digital 3D models of teeth are compared to detect tooth wear by determining differences between the segmented models, where the differences relate to the same tooth to detect wear on the tooth over time.

An exemplary method may comprise: ascertaining an original distance between a first tooth face and a second tooth face of a sprocket tooth, wherein the sprocket tooth comprises two tooth faces extending from a sprocket core and terminating in a top of the sprocket tooth, wherein an original distance separates the two tooth faces, placing a sprocket gauge on the sprocket tooth, wherein the sprocket gauge comprises: a bottom, and two gauge faces extending from the bottom of the sprocket gauge, wherein the bottom of the sprocket gauge is disposed upon the top of the sprocket tooth and the first gauge face is disposed adjacently on the first tooth; and comparing the original distance defined by the sprocket gauge with an actual distance between the first tooth face and the second tooth face.

The use of an oral care composition comprising certain alkyl phosphates is described for combating dental erosion and tooth wear.

Bruxism, which is a human medical condition characterized by clenching of the jaw and/or grinding of teeth, leads to conditions such as severe tooth wear and Temporomandibular Joint (TMJ) Disorder. Described herein is a biofeedback device that utilizes the human physiological reflex to open the mouth when the nasal airway is obstructed. The device and method blocks the nasal airway while clenching, but allows nasal respiration while not clenching. Clenching of the jaw and breathing through the mouth cannot happen simultaneously while unconscious.

Disclosed is a dental appliance composed of a thermo-plastic polymer with low compressibility, high toughness, and high tensile strength, with a low softening point. The appliance has perforations that enable it to be easily custom-fitted by the user or a health professional. The appliance begins as a generally U-shaped, unformed dental tray that is significantly thinner than existing dental appliances. Once fitted, the dental appliance provides superior protection against damage to the enamel of the teeth and abrasion of the teeth due to bruxism or other mechanism leading to biomechanical wear of dental surfaces. The perforations facilitate the custom-fitting process by allowing the user to suck air through the perforations, thus applying a negative pressure between the material and the teeth while the material is still soft and pliable. This enables a user or health professional to within minutes create a final product that rivals the quality and fit of an appliance made by dental laboratories using dentist made impressions.

A gear and a method of making a forged powder metal gear having a plurality of teeth and a variable case depth profile forged in the plurality of teeth. Each tooth of the plurality of teeth has a first surface and a tooth root. A variable case depth profile is formed in each tooth of the plurality of teeth, whereby the variable case depth profile exhibits greater tooth wear resistance on the first surface and greater impact resistance in the tooth root.

The invention belongs to the field of repairing of high speed pump shafts for petrochemical industry and relates to a laser cladding repairing method for end tooth wear or cracks of general high speed pump gear shafts. The method aims at repairing of parts with wear and cracks on end teeth in long-time running process and comprises the steps of firstly removing damaged end teeth and remanufacturing new end teeth, carrying out hot charging by utilizing the part size change caused by temperature difference, selecting stainless steel powder and wear-resistant Co-based alloy powder which have mechanical properties similar to those of a base material, carrying out cladding by adopting laser cladding process parameters, removing residual stress in cladded parts through a hammering method, finally recovering the parts to a design size through a precise mechanical processing method, thereby recovering the operational performance of the high speed pump gear shafts. The method disclosed by the invention has the advantages that in the laser cladding repairing process of the high speed gear pump shafts, the base material is maintained at a low temperature all the time during cladding and the part deformation rate is almost zero; and the obtained cladding layer is metallurgically combined with a matrix, the automatic efficiency is high and the cost is low.

The invention discloses a production method of attapulgite bifluoride toothpaste; the key points of the technical proposal are that: the production method of the attapulgite bifluoride toothpaste includes preparation of materials, low-speed stirring, grinding, high-speed stirring, vacuum degassing and canning into the finished product of the attapulgite bifluoride toothpaste. The attapulgite bifluoride toothpaste is composed of paste attapulgite clay, sodium fluoride, sodium monofluorophosphate, zinc citrate, sodium dodecyl sulfate, titanium white powder, sodium saccharine and deionized water. The attapulgite bifluoride toothpaste can absorb and remove a plurality of offensive smells in the oral cavity, reduce tooth wear, strengthen and regenerate the enamel on the surface of the teeth; the attapulgite bifluoride toothpaste has clean paste body, soft and delicate texture, normal luster and good stability, the paste body is not overflowed to the outside of a pipe mouth, the water is not separated from the invention, the flavor and the luster are normal, and the glass slide has no scratches. The invention is applicable to the production of attapulgite bifluoride toothpaste, Chinese herbal medicine toothpaste and other medicine toothpastes.

The present invention relates to a mouth guard and methods of use to aid in the treatment of bruxism and temporomandibular joint (TMJ) disorder comprising an adjustable molded thermoplastic outer face plate, an inner face plate and irritation spines, the mouth guard containing a section for placement and fitting to a patient's upper and lower dentition, the molded thermoplastic mouth guard including tooth channels that, upon commencing of tooth grinding, initiate mild irritation to the gums or cheeks of a wearer by the irritation spines wherein, the wearer is alerted to the occurrence of tooth grinding, whether the wearer is sleeping or awake, whereupon the wearer ceases the tooth grinding thereby preventing development of temporomandibular joint (TMJ) disorder and tooth wear.

The use of an oral care composition comprising particulate zinc oxide (suitably in nanoparticulate form) optionally in the presence of a source of fluoride ions is described for combating dental erosion and/or tooth wear. Such compositions are also of use in combating dental caries.

The invention relates to track-chain type removable denture. The track-chain type removable denture comprises an upper jaw part and a lower jaw part, wherein the upper jaw part and the lower jaw part adopt the identical overall structure and can be independently used with the single upper jaw and the single lower jaw. The track-chain type removable denture is characterized in that occlusion surfaces of denture bodies of the upper jaw part and the lower jaw part are produced according to tooth occlusion records of a patient, preferably, produced after a therapeutic occlusion pad is used for occlusal reconstruction, the thicknesses of the denture bodies of the upper jaw part and the lower jaw part are increased by 2-4 mm between the upper jaw part and the lower jaw part according to the tooth occlusion records of the patient and increased by 1-2 mm when a single jaw is used. The structure is suitable for short-time wearing, that is, the structure is suitable for being worn during dining for chewing activity and can be cleaned and disinfected for storage after being used, a single person can manufacture the track-chain type removable denture in batches to facilitate use, and the track-chain type removable denture can be worn for a long time like conventional removable denture; the problems of loss of a few teeth, tooth wearing, hemodia, oral impaction and the like can be solved, the overall chewing function is recovered, and occlusal reconstruction is performed.

The invention relates to a rotary cutter front-back cutter face tooth-by-tooth wear detector and detection method. The rotary cutter front-back cutter face tooth-by-tooth wear detector comprises a detector body, a data processing controller and a cutter data server, wherein the detector body and the data processing controller are connected by means of a signal cable, the data processing controlleris further connected to a CNC controller of a numerical control machine tool and the cutter data server, a 45-degree reflector, a telecentric lens, an inclined light source and a forward light sourceare arranged in the detector, a cutter image sequence is obtained in the rotation process of a cutter, the data processing controller performs 90-degree steering on an imaging optical path by using the 45-degree reflector, based on a gray-scale response detection principle, wear images of a front cutter face and a rear cutter face of the rotary cutter are directly acquired and analyzed directly in an on-machine mode tooth by tooth according to the cutter image sequence. The detector can be adopted to realize efficient and accurate direct observation of wear images of the front and rear cutterfaces of all cutter teeth in the rotating state.

The present invention discloses an outer tooth ring wear detection method. An outer tooth ring wear detection device is used. The outer tooth ring wear detection device comprises a driving gear which is engaged with an outer tooth ring. The lower end of the driving gear extends out of the end face of the lower end of the outer tooth ring, and the lower end face of the outer tooth ring is provided with a detection tooth which is corresponding to one tooth of the outer tooth ring and extends into driving gear teeth. The method comprises the steps of (A) fixing the detection tooth to the lower end face of the outer tooth ring through a bolt such that the wear value S of the outer tooth profile surface of the detection tooth is reduced relative to the outer tooth profile surface of one tooth of the outer tooth ring, and (B) checking the outer tooth profile surface of the detection tooth regularly, wherein the outer tooth profile surface of the outer tooth ring reaches an outer tooth ring replacement period when the outer tooth profile surface has a scratch. Compared with the prior art, the problem that the tooth wear on an existing outer tooth ring can not be detected can be solved.

The invention belongs to the field of numerical control machining of gears and relates to a seven-shaft and six-linkage opposite angle roll cutting method for a non-circular gear. In the implementation process of the method, three fundamental frequency shafts, another three shafts linked with the three fundamental frequency shafts and an independent numerical control shaft are applied; a hobbing cutter also continuously moves along the axis of the hobbing cutter while vertically feeding; and a linkage mathematical model is disclosed. According to the seven-shaft and six-linkage opposite angle roll cutting method disclosed by the invention, all blades of the hobbing cutter can be fully and effectively utilized; cutter tooth wear is uniformly distributed; the durability of the cutter is improved; the tooth profile shape precision and the surface roughness can be improved; and the independent numerical control shaft can automatically adjust a mounting angel of the hobbing cutter, and compared with a mechanical structure, the independent numerical control shaft has the advantages of higher automatic degree, higher adjustment precision and lower labor intensity of workers. The seven-shaft and six-linkage opposite angle roll cutting method disclosed by the invention can be used for numerical control gear hobbing of non-circular spur gears, non-circular helical gears, elliptical spur gears and elliptical helical gears.

The invention discloses an implant upper part repair pre-bonded abutment replica and a preparation method thereof. The implant upper part repair pre-bonded abutment replica comprises an implant upperpart repair body and a pre-bonded abutment replica inserted into the implant upper part repair body; the pre-bonded abutment replica comprises a steel nail and a resin abutment replica formed at one end of the steel nail; the end, fixedly provided with the resin abutment replica, of the steel nail is a fixed end, the end, away from the resin abutment replica, of the steel nail is a clamping end, and a mark is arranged at the clamping end; and the resin abutment replica comprises an embedding part and a sealing part. An abutment in the mouth of a patient can be simulated outside the mouth of the patient through the pre-bonded abutment replica, so that redundant adhesive can be effectively cleaned outside the mouth of the patient, cleaning operation of the adhesive is changed from intraoraloperation to extraoral operation, the tooth wearing time of a doctor is shortened, the mouth opening time and pain of the patient are reduced, a series of complications such as inflammation and feverof the oral cavity of the patient due to the fact that the adhesive is not completely cleaned can be avoided, and the health of the patient is protected.