Influence of thermal cycles in water on flexural strength of laboratory-processed composite resin.
Recently a new generation of laboratory-processed composite resins containing submicron glass fillers was introduced, with claims of high strength. The purpose of this study was to evaluate the effect of thermal cycling in water on the flexural strength and hardness of several laboratory composite systems. The flexural strength of the new laboratory processed composite resins (Artglass [AG], Targis [TR] and Estenia [ES]) was significantly higher than that of conventional resins (Dentacolor [DC] and Cesead II [CS]). Thermocycling caused a reduction of the flexural strength but not a reduction of the hardness for most of materials tested. It was concluded that thermocycling affected the properties of the laboratory-processed hybrid type composite resin, ES, AG and TR. However, the changes of these properties were smaller than those of microfine type composite resin DC. Thus, ES, AG and TR may maintain better properties during service compared with DC.
Kawano
F
F
Department of Removable Prosthodontics, The University of Tokushima, School of Dentistry, Tokushima, Japan. fumiaki@dent.tokushima-u.ac.jp
Ohguri
T
T
Ichikawa
T
T
Matsumoto
N
N
D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D016001:Confidence Intervals; D004548:Elasticity; D005898:Glass / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D018583:Pliability; D011092:Polyethylene Glycols / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012821:Silanes / Q000737:chemistry; D012823:Silicate Cement / Q000737:chemistry; D013223:Statistics as Topic; D013314:Stress, Mechanical; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*
D003188:Composite Resins; D005899:Glass Ionomer Cements; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D019279:Resin Cements; D012821:Silanes; C111282:dental polyglass; C404582:urethane tetramethacrylate; D014867:Water; C029824:urethane dimethacrylate luting resin; D012823:Silicate Cement; C020946:triethylene glycol dimethacrylate; C083620:cesead; D011092:Polyethylene Glycols; C057365:Dentacolor