title: Surface roughness of acrylic and silicone-based soft liners: in vivo study in a rat model.
abstract: OBJECTIVE
  The aim of this in vivo animal study was to investigate changes in the surface roughness of soft liners over time.
  
  
  METHODS
  Forty adult Wistar rats (Rattus norvergicus albinus) were fitted with acrylic custom-made palatal plates relined by dynamic impressions and tested with the following soft liners: Dentuflex (DF), Trusoft (TS), Dentusoft (DS), and Ufi Gel P (UG). Half of the animals for each tested material had the plates fitted during the material reline procedure. Their surface roughness was read immediately (IRa group, n = 5). The other half used the palatal plates for 14 days before roughness readings were performed (FRa group, n = 5). The surface roughness (Ra) of the inner surface from the relined dentures was recorded using a Surftest SJ-401 with eight readings per specimen, and mean values were obtained. Data (μm) were analyzed by two-way ANOVA and Tukey's test (α = 0.05).
  
  
  RESULTS
  IRa means (2.92 ± 0.87 μm) and FRa means (3.35 ± 0.65 μm) were significantly different (p = 0.016). UG showed a lower (p = 0.01) Ra mean (2.1 ± 0.52 μm) than DF (3.94 ± 0.81 μm), TS (4.12 ± 0.64 μm), and DS (3.27 ± 0.64 μm).
  
  
  CONCLUSIONS
  Ufi Gel P showed the smoothest surface among the materials evaluated. The period of use resulted in changes in the surface roughness of the materials tested.
authors.affiliation: Department of Dentistry, Ponta Grossa State University, Ponta Grossa, Brazil.
authors.forename: Michele
authors.initials: M
authors.lastname: Bail
authors.forename: Janaina Habib
authors.initials: JH
authors.lastname: Jorge
authors.forename: Vanessa Migliorini
authors.initials: VM
authors.lastname: Urban
authors.forename: Nara Hellen
authors.initials: NH
authors.lastname: Campanha
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000818:Animals; D003764:Dental Materials / Q000737:chemistry*; D003819:Denture Bases; D003822:Denture Liners; D003823:Denture Rebasing; D005260:Female; D008689:Methacrylates / Q000737:chemistry; D008768:Methylmethacrylates / Q000737:chemistry; D023421:Models, Animal; D051381:Rats; D017208:Rats, Wistar; D012826:Silicone Elastomers / Q000737:chemistry; D012828:Silicones / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D003764:Dental Materials; D008689:Methacrylates; D008768:Methylmethacrylates; D012826:Silicone Elastomers; D012828:Silicones; C483158:Ufi gel; C539076:dentuflex; C040291:Lucitone; C009931:poly(ethylmethacrylate); C016284:butyl methacrylate
keywords: Denture; complete; palate; polymers; rats, Wistar