False teeth

Falling rod viscometer Fallopian tubes False teeth Falvin... 

Acid cleaners based on sulfamic acid are used in a large variety of appHcations, eg, air-conditioning systems marine equipment, including salt water stills wells (water, oil, and gas) household equipment, eg, copper-ware, steam irons, humidifiers, dishwashers, toilet bowls, and brick and other masonry tartar removal of false teeth (50) dairy equipment, eg, pasteurizers, evaporators, preheaters, and storage tanks industrial boilers, condensers, heat exchangers, and preheaters food-processing equipment brewery equipment (see Beer) sugar evaporators and paper-mill equipment (see also Evaporation Metal surface treati nts Pulp). 

In 1855, the moldable features of collodion were exploited by the British inventor and chemist Alexander Parkes, who marketed the material as Parkesine. Combs, earrings, buttons, bracelets, billiard balls, and even false teeth were manufactured in his factories. Parkes chose to focus more on quantity than on quality, however. Because he used low-grade cotton and cheap but unsuitable solvents, many of his products lacked durability, which led to commercial failure. In 1870, John Hyatt, a young inventor from Albany, New York, discovered that collodions moldable properties were vastly improved by using camphor as a solvent. Hyatts brother Isaiah named this camphor-based nitrocellulose material celluloid. Because of its greater workability, celluloid became the plastic of choice for the manufacture of many household items. In addition, thin transparent films of celluloid made excellent supports for photosensitive emulsions, a boon to the photography industry and a first step in the development of motion pictures. 

False teeth -sulfamic acid cleaner for [SULFAMIC ACID AND SULFAMATES] (Vol 23)... 

First reported use of porcelain false teeth in France... 

Because it is extremely dense, hippo ivory is resistant to staining, and has therefore, in the past, been preferred to other ivories for the manufacture of false teeth. It was not much used before the nineteenth century, as until then the enamel was too hard to remove with the tools available. 

Since then, dental prosthetics, or false teeth, have been made of other materials, including celluloid and acrylic that can be molded to fit their wearers in comfort. 

In recent years, dental research has been focused on dental implants and artificial teeth rooted in a patient s jaw allowing for a permanent denture, as alternatives to bridges or false teeth. A wide array of materials including polymers such as UHMWPE, PTFE, and PET have been used in many types of existing dental implants [54,119]. Porous polymeric surfaces are now designed to facilitate bone integration [54], Other dental applications of polymeric biomaterials have been for the development of a dental bridge, meant as a partial denture or false teeth. In extreme cases, removable dentures fabricated from PMMA are used to overcome the loss of all teeth [203]. 

Crubezy, E., Murail, P., Girard, L., Bemadou, J.-P., 1998. False teeth of the Roman world. Nature 391, 29. 

Dental Porcelain. Feldspathic porcelain, shaped, tinted and fired for use as false teeth the firing is sometimes carried out in a partial vacuum to remove small air bubbles and thus ensure maximum density and strength. X-ray diffraction studies have shown fired dental porcelain to be some 80% glassy phase. Dental porcelain jacket crowns are specified by BS 5612, denture teeth by BS 6817. 

The basic argument in favour of plastics is that they provide a choice, functionally, aesthetically or monetarily. If you need an artificial hip joint or false teeth, the choice is straightforward—to be specific, there isn t one. If you prefer leather suitcases to vinyl, or silk stockings to nylon, you are at liberty to buy them and preserve the quality of your life. 

Human jaws are very strong, creating tremendous grinding stresses. Materials that are used both as fillers and false teeth need to be both strong and abrasion resistant. 

Denture Teeth The two kinds of false teeth in common service today are based either on porcelain or on highly filled, densely cross-linked... 

Table 13.12 also describes a homo-lPN of poly(methyl methacrylate), densely cross-linked, that provides a basis for artificial (false) teeth (112,113). These teeth have two superior properties Because of the suspension polymerization route used, the dentist can grind the teeth to a fine powder, which is useful when fitting them to the opposing set of teeth. Second, because they are densely cross-linked, they do not swell significantly in salad oils, margarine, and butter, which plasticize poly (methyl methacrylate). 

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