title: Effect of PMMA filler particles addition on the physical properties of resin composite.
abstract: The aim of this study was to evaluate the effect of additional polymethyl methacrylate (PMMA) fillers on the physical properties of experimental resin composites. PMMA particles (d=30 µm) were added to an experimental methacrylate-based resin composite in five concentrations of 0, 2.0, 4.8, 9.1, and 23.1 wt%. Properties such as contact angle, water sorption and compressive strength were measured and the fractured specimens were observed with a scanning electron microscope. The results showed that a small amount (2 wt%) of additional PMMA fillers inhibited the crack propagation and enhanced compressive strengths of the resin composites, without a significant change in water contact angle of surface or increased water sorption. However, in higher portions, the mechanical properties were not improved as a debonding at the interface between untreated fillers and the matrix, or failure within the organic filler could reduce the compressive yield strength of the composite.
authors.affiliation: Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 5-45 Yushima 1-chome, Bunkyo-ku, Tokyo 113-8549, Japan.
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Kondo
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Takagaki
authors.forename: Makoto
authors.initials: M
authors.lastname: Okuda
authors.forename: Masaomi
authors.initials: M
authors.lastname: Ikeda
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Kadoma
authors.forename: Junichi
authors.initials: J
authors.lastname: Yamauchi
authors.forename: Koichi
authors.initials: K
authors.lastname: Okada
authors.forename: Alireza
authors.initials: A
authors.lastname: Sadr
authors.forename: Toru
authors.initials: T
authors.lastname: Nikaido
authors.forename: Junji
authors.initials: J
authors.lastname: Tagami
mesh_terms: D000042:Absorption; D000268:Adhesiveness; D000327:Adsorption; D055598:Chemical Phenomena; D003188:Composite Resins / Q000737:chemistry*; D019245:Compressive Strength; D003764:Dental Materials / Q000737:chemistry*; D055119:Elastic Modulus; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D014867:Water / Q000737:chemistry; D017155:Wettability
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D008689:Methacrylates; D014867:Water; D019904:Polymethyl Methacrylate