Physical Properties of Cements, Based on Zinc Oxide, Hydrogenated Rosin, o-Ethoxybenzoic Acid, and Eugenol

A review of zinc oxide-eugenol type filling materials and cements

“…Coefficient of Thermal Expansion -The coefficient of linear thermal expansion is 35x10-°per°C In the 25 to 60°C range [18]. This is about three times the value obtained for enamel.…”

“…Setting Shrinkage -The volumetric setting shrinkage Is 0.9^I n water [18]. This Is little higher than the value for silicate cements, but considerably lower than the 6^s hrinkage encountered In self-curing filling resins and should be of little clinical importance.…”

“…High powder-liquid ratios are also desirable to increase strength. Trituration with a mortar and pestle or mixing for 30 seconds in a mechanical amalgamator using gelatin capsules has recently been suggested [18]. The rate and time of setting are somewhat affected by the length of spatulation.…”

“…Powder-liquid ratio also influenced abrasion resistance as less weight loss occured In specimens prepared with the higher powder-liquid ratios. Dynamic influences (such as suspending the specimen in a stirred solution or repeated brushing with a weighed toothbrush) greatly Increase the disintegration [18], Ultrasonic stirring was especially harmful. Sealing properties of ZOE cement when evaluated on the basis of their ability to prevent the penetration of Ca'^5 at the marginal areas are superior to those of either silicate or zinc phosphate cement [26].…”

"Estudo da evolução da reação de presa do cimento de fosfato de zinco através de luz laser, aplicando a técnica óptica de speckle dinâmico"

“…Os trabalhos e artigos da literatura, pesquisaram de forma indireta a evolução da reação de presa do cimento de fosfato de zinco, por meio da análise de características, tais como: variação do pH, variação de resistência à compressão e variação da contração linear (ATTAR; TAM; MCCOMB, 2003;BRYANT;WING, 1976;CIVJAN;BRAUER, 1964;SWARTZ, 1991;POWERS, 2004;DUYMUS, 2004;OILO, 1975;ISAACS, 1933;PEARSON;ATKINSON, 1987;PHILLIPS, 1991;SMITH, 1971;DORIN RUSE, 1986). Não há na literatura pesquisas que demonstrem de modo rigoroso a evolução da reação em função do tempo.…”