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Objective: To examine the influence of silane-coating material in surface hardness of provisional fixed prosthodontic material and compare the changes in surface hardness after thermocycling.
Materials and Methods: Fifty specimens, fabricated from four commercial provisional restorative materials (GC Unifast Trad ™, Major C&B dentine, Protemp™ 4, Luxatemp® star) and a silane coating provisional restorative material (GC Unifast Trad™ coated), were allocated for control condition and thermocycling condition (n=5/group). Surface hardness of the sample from each group was determined using Vicker’s surface hardness. The silane coating provisional restorative material was characterized by Fourier-transform infrared (FTIR) spectrometer. The surface morphologies of specimens from each group were observed under scanning electron microscope (SEM). The results were analyzed using two-way ANOVA statistical analysis.
Result: In control condition, hardness of GC Unifast Trad™ coated was significantly higher than that of GC Unifast Trad™. In addition, hardness of GC Unifast Trad™ coated was not significantly different than that of Luxatemp® star. In thermocycling condition, hardness of GC Unifast Trad™ coated was significantly higher than that of GC Unifast Trad™. Moreover, hardness of GC Unifast Trad™ coated was not significantly different than that of Protemp™ 4.
Conclusion: The surface of acrylic resin coated with silane-SiO2 nanocomposite film exhibits higher hardness compared to conventional acrylic resin and hardly different from bis-acryl composite resin. Even though, after thermocycling condition, the hardness of acrylic resin coated is still close to bis-acryl composite resin.
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