title: High modulus nanopowder reinforced dimethacrylate matrix composites for dental cement applications.
abstract: Results from the study of a novel, high modulus nanopowder filled resin composite are presented. This composite is developed to serve (1) as a high stiffness support to all-ceramic crowns and (2) as a means of joining independently fabricated crown core and veneer layers. Nanosized Al(2)O(3) (average particle size 47 nm) reinforcement provides stiffness across joins. Two systems are examined: Al(2)O(3) with 50:50 bis-GMA:TEGDMA monomers (ALBT) and Al(2)O(3) with pure TEGDMA (ALT). To obtain higher filler levels, surfactant is used to aid mixing and increase maximum weight percent of nanopowder filler from 72 to 80. The loading level of Al(2)O(3) has significant effects on composite properties. The elastic modulus for cured ALBT systems increases from 4.6 GPa (0 wt % filler) to 29.2 GPa (80 wt % filler). The elastic modulus for cured ALT systems increases from 3.0 GPa (0 wt % filler) to 22.9 GPa (80 wt % filler). Similarly, ALBT hardness increases from 200 MPa (0% filler) to 949 MPa (80 wt % filler), and ALT hardness increases from 93 MPa (0% filler) to 760 MPa (80 wt % filler). Our results indicate that with a generally monodispersed nanosized high modulus filler relatively high elastic modulus resin based composite cements are possible.
authors.affiliation: Department of Materials Science and Engineering, University of Maryland, College Park, Maryland, USA. yijun@umd.edu
authors.forename: Yijun
authors.initials: Y
authors.lastname: Wang
authors.forename: James J
authors.initials: JJ
authors.lastname: Lee
authors.forename: Isabel K
authors.initials: IK
authors.lastname: Lloyd
authors.forename: Otto C
authors.initials: OC
authors.lastname: Wilson
authors.forename: Marc
authors.initials: M
authors.lastname: Rosenblum
authors.forename: Van
authors.initials: V
authors.lastname: Thompson
mesh_terms: D000537:Aluminum Oxide; D003188:Composite Resins / Q000737:chemistry / Q000627:therapeutic use*; D003738:Dental Cements / Q000737:chemistry*; D006244:Hardness; D019563:Mechanics; D008689:Methacrylates / Q000627:therapeutic use*; D053758:Nanoparticles; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D011208:Powders / Q000627:therapeutic use*
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011208:Powders; C020946:triethylene glycol dimethacrylate; D011092:Polyethylene Glycols; D000537:Aluminum Oxide