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Metals dental personal

Mercury was used to cure the felt used in hats, and workers developed the characteristic signs of mercury vapor toxicity. Acute exposure to high concentrations of mercury vapor causes respiratory distress, which can be fatal. The symptoms of chronic exposure to mercury vapor include personality changes such as excitability, depression, memory loss, fine motor tremor that can become progressively worse, gingivitis, and hallucination. There is some mercury inhalation exposure from dental amalgam, but for most people there are no health-related effects. Metallic mercury is very poorly absorbed from the intestine, thus it is much better to swallow the mercury from a thermometer than inhale it (see chapter on mercury). [Pg.129]

Phosphoric acid is used as an intermediate in the production of animal feed supplements, water treatment chemicals, metal surface treatments, etching agent, and personal care products such as toothpaste. It is used as a catalyst in the petroleum and polymer industry. Phosphoric acid is used in food as a preservative, an acidulant, and flavor enhancer it acidifies carbonated drinks such as Coca Cola and Pepsi, giving them a tangy flavor. Phosphoric acid is used as a rust remover and metal cleaner. Naval Jelly is approximately 25% phosphoric acid. Other uses for phosphoric acid include opacity control in glass production, textile dyeing, rubber latex coagulation, and dental cements. [Pg.220]

Solutions include different combinations in which a solid, liquid, or gas acts as either solvent or solute. Usually the solvent is a liquid. For instance, sea water is an aqueous solution of many salts and some gases such as carbon dioxide and oxygen. Carbonated water is a saturated solution of carbon dioxide in water. Solutions are common in nature and are extremely important in all life processes, in all scientific areas, and in many industrial processes. The body fluids of all forms of life are solutions. Variations in concentrations of our bodily fluids, especially those of blood and urine, give physicians valuable clues about a person s health. Solutions in which the solvent is not a liquid are also common. Air is a solution of gases with variable composition. Dental fillings are solid amalgams, or solutions of liquid mercury dissolved in solid metals. Alloys are solid solutions of solids dissolved in a metal. [Pg.543]

Complete and uniform dispersibility of fillers in a matrix is a prerequisite for a con )osite to have optimum properties. Regardless of conq>osition, shape or size of the particles, less than optimum distribution in, for exanq)le, ceramic, metal or polymer material can result in lower mechanical strength, random discoloration or decreased electrical or thermal conductivity. For these and other reasons much effort has been and continues to be devoted to understanding fundamental reasons why some powders readily disperse in a medium and others do not. It is clear from many historic studies (1-4) that the surface chemistry of a particle, which dictates relative hydrophilicity-hydrophobicity and zeta potential, is the dominant factor. Benefit of perfected filler dispemibility are found in dental resins (5), personal body armor (6), cosmetics and sunscreens (7), rubber products (5), latex paint (P), metal matrix conq)osites (10), inks and gels (11), many foods, and in abrasive slurries used for chemical mechanical planarization (CMP of wafers during con )uter chip manufacture (12),... [Pg.171]


See other pages where Metals dental personal is mentioned: [Pg.74]    [Pg.74]    [Pg.154]    [Pg.88]    [Pg.27]    [Pg.294]    [Pg.296]    [Pg.303]    [Pg.343]    [Pg.529]    [Pg.2285]    [Pg.492]    [Pg.63]    [Pg.298]   
See also in sourсe #XX -- [ Pg.903 ]




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