Toughening of dental glass ionomer cements with reactive glass fibres.
A fibre reinforced glass ionomer cement (FRGIC) for dental applications was loaded with 20 vol% short fibres (430 microm) with a glass composition in the system SiO(2)-Al(2)O(3)-CaF(2)-Na(3)AlF(6). The fracture toughness and the total energy release rate were examined. A 20% anisotropic fibre alignment was observed, perpendicular to the loading direction. An increase of fracture toughness of 140% and of total energy release rate of 440% was achieved compared to the unreinforced glass ionomer cement. Matrix-fibre interface reaction is supposed to exert the major influence on mechanical behaviour of FRGIC by controlling fibre pull-out and thus the total energy release rate.
Lohbauer
Ulrich
U
Policlinic for Operative Dentistry and Periodontology, University of Erlangen, Glueckstrasse 11, 91054 Erlangen, Germany. lohbauer@dent.uni-erlangen.de
Frankenberger
Roland
R
Clare
Alexis
A
Petschelt
Anselm
A
Greil
Peter
P
D016880:Anisotropy; D001672:Biocompatible Materials; D003188:Composite Resins; D005898:Glass / Q000737:chemistry*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D007477:Ions; D008422:Materials Testing; D046529:Microscopy, Electron, Transmission; D015233:Models, Statistical; D019279:Resin Cements; D012825:Silicon / Q000737:chemistry; D013718:Tensile Strength
D001672:Biocompatible Materials; D003188:Composite Resins; D005899:Glass Ionomer Cements; D007477:Ions; D019279:Resin Cements; C009753:fiberglass; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D012825:Silicon