title: Enhancement of mechanical properties of experimental composite by Fuller's earth nanofibers for cervical restoration.
abstract: In this research, we studied improvement of mechanical properties of dimethacrylate-silica based dental composites by addition of Fuller's Earth (FE) clay. Three composites were made as base compounds consisting of 68, 58, and 48 wt % resin and 31, 41, and 51 wt % silica, respectively. Afterward, the composites were modified by adding FE. Mechanical properties including flexural strength, flexural modulus, work-of-fracture, fracture toughness, and microhardness were measured. Clay particles and fracture surface of composites consisting of 51 wt % silica (with and without FE) were examined by SEM. Measured results showed that flexural strength, work-of-fracture, flexural modulus, and microhardness of all composites increased by including FE nanofibers. Fracture toughness except for composite including 51 wt % silica had similar variations. It seems that locating FE nanofibers in weak resin region among silica particles leads to strengthening mechanisms, such as bridging and crack deflection, which cause improvement in mechanical properties.
authors: School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, Iran.
authors: Aydin
authors: A
authors: Houshyar
authors: Ali Reza
authors: AR
authors: Khavandi
authors: Jafar
authors: J
authors: Javadpour
authors: Saeed
authors: S
authors: Samani
authors: Mohammad Reza
authors: MR
authors: Naimi-Jamal
authors: Mohammad
authors: M
authors: Atai
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D001696:Biomechanical Phenomena; D003188:Composite Resins / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D006801:Humans; D017616:Magnesium Compounds / Q000737:chemistry*; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D017640:Silicates / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry; D013314:Stress, Mechanical
chemical_list: D017607:Aluminum Compounds; D003188:Composite Resins; D003764:Dental Materials; D017616:Magnesium Compounds; D008689:Methacrylates; D017640:Silicates; D012822:Silicon Dioxide; C001262:Fuller's Earth
keywords: Fuller's earth; cervical restoration; dental/craniofacial material; mechanical properties