title: Effect of silver nanoparticles incorporation on viscoelastic properties of acrylic resin denture base material.
abstract: OBJECTIVE
  The objective was to investigate the effect of silver nanoparticles (AgNPs) incorporation on viscoelastic properties of acrylic resin denture base material.
  
  
  METHODS
  A total of 20 specimens (60 × 10 × 2 mm) of heat cured acrylic resin were constructed and divided into four groups (five for each), according to the concentration of AgNPs (1%, 2%, and 5% vol.) which incorporated into the liquid of acrylic resin material and one group without additives (control group). The dynamic viscoelastic test for the test specimens was performed using the computerized material testing system. The resulting deflection curves were analyzed by material testing software NEXYGEN MT.
  
  
  RESULTS
  The 5% nanoparticles of silver (NAg) had significantly highest mean storage modulus E' and loss tangent Tan δ values followed by 2% NAg (P < 0.05). For 1% nanosilver incorporation (group B), there were no statistically significant differences in storage modulus E', lost modulus E" or loss tangent Tan δ with other groups (P > 0.05).
  
  
  CONCLUSIONS
  The AgNPs incorporation within the acrylic denture base material can improve its viscoelastic properties.
authors.affiliation: Department of Removable Prosthodontics, College of Dentistry, Al-Azhar University, Cairo, Egypt.|Department of Restorative Dental Sciences, Alfarabi Colleges, Riyadh, Saudi Arabia.
authors.forename: Hamada Zaki
authors.initials: HZ
authors.lastname: Mahross
authors.affiliation: Department of Restorative Dental Sciences, Alfarabi Colleges, Riyadh, Saudi Arabia.
authors.forename: Kusai
authors.initials: K
authors.lastname: Baroudi
keywords: Acrylic resin denture; nanoparticles; viscoelastic