Magnesium oxide Magnesium oxide Magnesium oxide (MgO), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of and consists of a lattice of Mg ions and O ions held together by ionic bonding. Magnesium hydroxide forms in the presence of water (MgO + HO → Mg(OH)), but it can be reversed by heating it to separate moisture. Magnesium oxide was historically known as magnesia alba (literally, the white mineral from magnesia – other sources give magnesia alba as MgCO), to differentiate it from "magnesia
10-Methacryloyloxydecyl dihydrogen phosphate 10-Methacryloyloxydecyl dihydrogen phosphate MDP Monomer (10-Methacryloyloxydecyl dihydrogen phosphate) is used for dental adhesive materials. The phosphate monomer was developed by Kuraray co., Ltd. with focus on the dental adhesion technology in 1981. 10-MDP MDP is synthesized according to the following reaction. At first, 10-hydroxydecy methacrylate is synthesized by reaction with methacrylic acid and 1,10-decandiol. Next, phosphoryl chloride is added to 10-hydroxydecy methacrylate, then, the bonding of P-Cl is hydrolyzed. In the late 1970s, tooth adhesion phosphate monomer: 2-methacryloyloxethyl phenyl hydrogen phosphate (Phenyl-P) was developed for tooth substance saving restoration technique. 4-Methacryloyloxyethyl trimellitic acid anhydride (4-META) that adhere to not only