title: Effect of sealer coating and storage methods on the surface roughness of soft liners.
abstract: BACKGROUND
  A soft lining is applied under a removable prosthesis for various reasons. The porosity of the lining material may increase colonization by microorganisms and cause tissue inflammation.
  
  
  OBJECTIVE
  The purpose of this in vitro study was to evaluate the effect of sealer coating on the surface roughness of soft lining materials under 4 different conditions.
  
  
  METHODS
  A total of 125 specimens were prepared. One high-temperature silicone-based soft lining material and 2 room-temperature-polymerized soft lining materials (1 silicone-based and 1 methacrylate-based) were used. Twenty-five specimens of each room-temperature soft lining material were coated with 2 layers of surface sealer. Additionally, 5 specimens of each material were stored in either distilled water, Coca-Cola, denture cleanser, saliva, or air. The surface roughness was measured at baseline and after 1, 7, 14, and 28 days. Surface roughness values were analyzed with repeated measures analysis of variance, and the Bonferroni multiple comparison test was performed using time-dependent groups and storage methods.
  
  
  RESULTS
  In the time-dependent groups, methacrylate-based sealer-coated soft liners exhibited a significant increase in roughness (1.74-2.09 μm, P<.001), and silicone-based sealer-coated soft liners exhibited a decrease in roughness, but it was not significant (2.16-2.02 μm, P>.05). Therefore, the sealer coating was not effective in reducing surface roughness. Among the time-dependent storage methods, the denture cleanser exhibited an almost significant increase in roughness (1.83-1.99 μm, P=.054). Coca-Cola and artificial saliva did not show a significant difference (P>.05). However, a significant decrease in roughness was found with distilled water (P=.02) and air (P<.001).
  
  
  CONCLUSIONS
  Statistically significant differences in surface roughness were found among the different types of soft liners. The sealer coating had no significant effect, and denture cleanser slightly increased the surface roughness. Contrary to expectations, the roughness did not increase in all groups over time.
authors.affiliation: Research Assistant, Department of Prosthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey.
authors.forename: Ilknur
authors.initials: I
authors.lastname: Usta Kutlu
authors.affiliation: Professor, Department of Prosthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey. Electronic address: nyanikoglu@gmail.com.
authors.forename: Nuran Dinckal
authors.initials: ND
authors.lastname: Yanikoğlu
authors.affiliation: Research Assistant, Department of Prosthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey.
authors.forename: Esra
authors.initials: E
authors.lastname: Kul
authors.affiliation: Professor, Department of Prosthodontics, Faculty of Dentistry, Recep Tayyip Erdoğan University, Rize, Turkey.
authors.forename: Zeynep Yesïl
authors.initials: ZY
authors.lastname: Duymuş
authors.affiliation: Research Assistant, Department of Prosthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey.
authors.forename: Nurdan Polat
authors.initials: NP
authors.lastname: Sağsöz
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003820:Denture Cleansers; D003822:Denture Liners; D008422:Materials Testing; D012826:Silicone Elastomers; D012828:Silicones; D013499:Surface Properties; D013997:Time Factors; D014867:Water
chemical_list: D000180:Acrylic Resins; D020099:Coated Materials, Biocompatible; D003820:Denture Cleansers; D012826:Silicone Elastomers; D012828:Silicones; D014867:Water