The ammonium cation is a positively-charged polyatomic ion with the chemical formula NH+4 or [NH4]+. It is formed by the protonation of ammonia. Ammonium is also a general name for positively charged or protonated substituted amines and quaternary ammonium cations, where one or more hydrogen atoms are replaced by organic groups.
Dental restoration, dental fillings, or simply fillings are treatments used to restore the function, integrity, and morphology of missing tooth structure resulting from caries or external trauma as well as to the replacement of such structure supported by dental implants. They are of two broad types—direct and indirect—and are further classified by location and size. A root canal filling, for example, is a restorative technique used to fill the space where the dental pulp normally resides.
This discussion of the dental amalgam controversy outlines the debate over whether dental amalgam should be used. Supporters claim that it is safe, effective and long-lasting while critics argue that claims have been made since the 1840s that amalgam is unsafe because it may cause mercury poisoning and other toxicity.
Sodium amalgam, commonly denoted Na(Hg), is an alloy of mercury and sodium. The term amalgam is used for alloys, intermetallic compounds, and solutions involving mercury as a major component. Sodium amalgams are often used in reactions as strong reducing agents with better handling properties compared to solid sodium. They are less dangerously reactive toward water and in fact are often used as an aqueous suspension.
Amalgam Comics was a collaborative publishing imprint shared by DC Comics and Marvel Comics, in which the two comic book publishers merged their characters into new ones. These characters first appeared in a series of 12 one-shot comic books which were published in April 1996, between Marvel vs. DC #3 and DC vs. Marvel #4, the last two issues of the DC vs. Marvel crossover event. A second set of 12 one-shots followed one year later in June 1997, but without the crossover event as a background. All 24 of these one-shots chronologically occurred between the aforementioned issues of DC vs. Marvel.
Dental composite resins are dental cements made of synthetic resins. Synthetic resins evolved as restorative materials since they were insoluble, of good tooth-like appearance, insensitive to dehydration, easy to manipulate and inexpensive. Composite resins are most commonly composed of Bis-GMA and other dimethacrylate monomers, a filler material such as silica and in most applications, a photoinitiator. Dimethylglyoxime is also commonly added to achieve certain physical properties such as flow-ability. Further tailoring of physical properties is achieved by formulating unique concentrations of each constituent.
DC vs. Marvel was a comic book miniseries intercompany crossover published by DC Comics and Marvel Comics from April to May 1996. Each company would publish two issues of the series, thus the title difference between issues #1 and 4 as DC vs. Marvel from DC and issues #2–3 from Marvel as Marvel vs. DC. The series was written by Ron Marz and Peter David, with art by Dan Jurgens and Claudio Castellini.
Aluminium can form an amalgam in solution with mercury. Aluminium amalgam may be prepared by either grinding aluminium pellets or wire in mercury, or by allowing aluminium wire to react with a solution of mercury(II) chloride in water.
Dental amalgam is a liquid mercury and metal alloy mixture used in dentistry to fill cavities caused by tooth decay. Low-copper amalgam commonly consists of mercury (50%), silver (~22–32%), tin (~14%), zinc (~8%) and other trace metals.
Blassreiter is a Japanese anime series created by studio Gonzo and the multimedia studio Nitro+. The title is pseudo-German and can be translated as "Pale Rider". A manga titled Blassreiter: Genetic was serialized in Champion Red magazine.
Amalgam most commonly refers to:
An amalgam is an alloy of mercury with another metal. It may be a liquid, a soft paste or a solid, depending upon the proportion of mercury. These alloys are formed through metallic bonding, with the electrostatic attractive force of the conduction electrons working to bind all the positively charged metal ions together into a crystal lattice structure. Almost all metals can form amalgams with mercury, the notable exceptions being iron, platinum, tungsten, and tantalum. Silver-mercury amalgams are important in dentistry, and gold-mercury amalgam is used in the extraction of gold from ore. Dentistry has used alloys of mercury with metals such as silver, copper, indium, tin and zinc.
Hal Alan Huggins was an American alternative dentistry advocate and campaigner against the use of dental amalgam fillings and other dental therapies that he believed to be unsafe. Huggins began to promote his ideas in the 1970s and played a major role in generating controversy over the use of amalgam. Huggins's license to practice dentistry was revoked in 1996 after a panel found him guilty of gross negligence. Since then, he continued to publish on the topic of mercury and human health and believed that dental amalgam and other dental practices were responsible for a range of serious diseases. Many of Huggins' health claims have been criticized as pseudoscientific and quackery.
Amalgam Digital is an independent record label based in East Boston, Massachusetts. Founded in 2006 by Anyextee, the privately owned label had been home to a variety of artists throughout the decade before significantly downsizing in its later years. The label's online store was the first genre-specific digital download store specializing in hip hop music. It focuses on independent labels and artists through the implementation of a new user-generated content module that allowed artists to upload content directly to the site for immediate purchase. Amalgam Digital also houses an exclusive independent record label by the same name, specializing in hip hop music and distribution. In an April 2008 issue, The Source proclaimed that Amalgam Digital has "its finger on the pulse of hip-hop's future."
In mathematics, amalgam spaces categorize functions with regard to their local and global behavior. While the concept of function spaces treating local and global behavior separately was already known earlier, Wiener amalgams, as the term is used today, were introduced by Hans Georg Feichtinger in 1980. The concept is named after Norbert Wiener.
Amalgam tattoo is a grey, blue or black area of discoloration on the mucous membranes of the mouth, typically on the gums of the lower jaw. It is a healthcare caused lesion, due to entry of dental amalgam into the soft tissues. It is common, painless, and benign, but it can be mistaken for melanoma.
