title: Modulation of physical properties of polyvinylsiloxane impression materials by filler type combination.
abstract: Polyvinylsiloxanes (PVS), used as dental impression materials, were formulated with the variation of loading combination of six types of fillers including nano-sized fumed silica. The fillers were blended with three types of silicone polymers together with cross-linker and inhibitor in base paste and with plasticizer and platinum catalyst in catalyst paste. By replacing parts of crystalline quartz with other fillers, the setting time became much faster. The test group in which quarter of quartz was replaced with fumed silica showed the most ideal working and setting time for clinical use. There was a negative correlation between pH and setting time (p < 0.05). Combining the fumed silica was effective in increasing the viscosity, tensile strength and maximum% strain. Combining the diatomaceous earth reduced the setting time and maximum% strain, and dramatically increased the viscosity and tensile strength. The best modulation of physical properties of PVS material was possible by combining fillers during the formulation.
authors: Department of Dental Materials and 2nd Stage of Brain Korea 21 Project, School of Dentistry, Chonnam National University, Gwangju 500-757, Korea.
authors: Jeong-Hun
authors: JH
authors: Choi
authors: Min-Kang
authors: MK
authors: Kim
authors: Hee-Gweon
authors: HG
authors: Woo
authors: Ho-Jun
authors: HJ
authors: Song
authors: Yeong-Joon
authors: YJ
authors: Park
mesh_terms: D003760:Dental Impression Materials / Q000737:chemistry*; D004548:Elasticity; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology; D011145:Polyvinyls / Q000737:chemistry*; D011791:Quartz / Q000737:chemistry; D012833:Siloxanes / Q000737:chemistry*; D013718:Tensile Strength; D014783:Viscosity
chemical_list: D003760:Dental Impression Materials; D011145:Polyvinyls; D012833:Siloxanes; C034183:vinyl polysiloxane; D011791:Quartz