title: Comparison of the microhardness and morphology of five different retrograde filling materials in aqueous and dry conditions.
abstract: The purpose of the present study was to compare the effect of dry and aqueous conditions on the surface morphology and surface hardness of five materials 24 h after being used as fillings without initial setting time in dry condition. The five materials were ProRoot mineral trioxide aggregate (MTA), super EBA, intermediate restorative materials (IRM), zinc oxide eugenol (ZOE), and amalgam. To evaluate microhardness, the five materials were submitted to the Vickers microhardness (VHN) test. We used a scanning electron microscope (Steroscan 440, Leica Cambridge, England) to observe the microstructural morphology of the five different materials. The VHN of MTA soaked in water showed five times lower than that of MTA soaked in dry condition. On the other hand, super EBA was less influenced by the medium of storage compared with the other materials. Scanning electron microscope (SEM) images showed the similar results with microhardness tests. The surface of MTA soaked in water appeared to be unstable compared with that of dry condition while super EBA showed similarly smooth surface in both conditions (aqueous and dry). In conclusion, the physical property of MTA is reduced after storage in water; however, super EBA is less influenced by aqueous condition.
authors.affiliation: Department of Conservative Dentistry, The Catholic University of Korea, St. Paul's Hospital, Seoul, Korea.
authors.forename: E M
authors.initials: EM
authors.lastname: Rhim
authors.forename: S Y
authors.initials: SY
authors.lastname: Huh
authors.forename: S J
authors.initials: SJ
authors.lastname: Ahn
authors.forename: P V
authors.initials: PV
authors.lastname: Abbott
authors.forename: E C
authors.initials: EC
authors.lastname: Kim
authors.forename: S H
authors.initials: SH
authors.lastname: Park
mesh_terms: D006244:Hardness; D006245:Hardness Tests; D006801:Humans; D008855:Microscopy, Electron, Scanning; D012387:Root Canal Filling Materials / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D012387:Root Canal Filling Materials