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Fracture toughness of modified dental resin systems
Author(s) -
Kerby R. E.,
Tiba A.,
Knobloch L. A.,
Schricker S. R.,
Tiba O.
Publication year - 2003
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1046/j.1365-2842.2003.01153.x
Subject(s) - distilled water , materials science , fracture toughness , composite material , glass transition , methacrylate , toughness , universal testing machine , toughening , copolymer , polymer , ultimate tensile strength , chemistry , chromatography
summary This study compared the relative fracture toughness of a Bis‐GMA//TEGDMA (50:50 wt%)‐based resin system modified by 5, 10, and 15 wt% of a methacrylate‐terminated poly(butadiene‐acrylonitrile‐acrylic acid) terpolymer toughening agent. After storage in distilled water at 37 ± 2 °C for 7 days, plane strain fracture toughness ( K IC ) was determined on an Instron testing machine at a 0·5‐mm min −1 displacement rate. The glass transition temperature ( T g ) in °C was determined after 7 days (dry and wet) storage by thermomechanical analysis. The results of this study showed significantly improved fracture toughness and lowered water sorption with the modified resin systems which was indicated by higher wet glass transition temperatures.