A New Micro-composite Material of Micro-particle Amalgam/Polyvinyl Alcohol for Teething Structures


Dental amalgam is a mixture of approximately 50% mercury and varying ratiosof silver, tin, zinc, and copper. Dental amalgam is a major source of mercurypollution because it is readily absorbed through 90-100% vapour and the oralmucosa. In addition, in certain situations with the oral environment, various types ofmetallic orthodontic brackets are highly aggressive and can lead to corrosion.However, polyvinyl alcohol (PVA) material has no cytogenetic effects on humanhealth or the environment and is therefore applied in the manufacturing of the newcomposite material. Different additives from the bonding agent (PVA; 2.4, 4.8, and7.2 g) dissolved in about 10 ml of water, heated on a hot plate under a hightemperatureheat treatment (150-200 ᴼC), and continuously stirred for about 20minutes, until all the PVA dissolved or the solution became colorless. Subsequently,a fixed amount of powdered amalgam (2.4g) added after the mercury content wasseparated. It was continuously mixed until it reached a homogenous solution, thenmolded and cured to give the final product. New samples were used for thefollowing purposes: (1) to investigate their effects on the chemical, thermal andmechanical properties of the composite samples, (2) composite scanning and imagesfrom the EDS diffraction. Scanning lectron microscopy (SEM) indicated that thepresence of the methyl group (CHI) that lowers the crystallinity of PVA, also formsbridges between the different chains obtained to indicate the suitable materials forguided dental applications.