title: The influence of water storage on durometer hardness of 5 soft denture liners over time.
abstract: OBJECTIVE
  This laboratory study investigated the influence of water storage on the durometer hardness of 2 RTV and 3 HTV soft denture liners over a 1-year period.
  
  
  METHODS
  Five soft denture liners were used: 2 HTV silicone rubber (Luci-Sof and Molloplast-B), 1 RTV silicone rubber (Tokuyama), 1 HTV polyphosphazene (Novus), and an RTV plasticized acrylic (PermaSoft) that uses a surface sealer. They were processed following manufacturers' instructions, cured, and stored in tap water at 37 degrees C. The water was changed every 2 weeks. Five durometer A hardness measurements were made at logarithmically spaced intervals of 16.7 minutes, 27.8 hours, 11.6 days, 34.7 days, 115 days, and 347 days. Repeated measures analysis of variance (MANOVA), one-way analysis of variance (ANOVA), Pillai trace statistic, the difference scores (last-first) among the groups, and the Tamhane T2 multiple comparison test were used to compare the groups over time, all on SPSS V. 7.5 and 9.0.
  
  
  RESULTS
  The order of highest initial indentation hardness was Luci-Sof, Molloplast-B, Novus (H(D)= 38 to 33). Tokuyama and PermaSoft as a group were softer (H(D)= 18 to 22). Tokuyama Soft Relining changed the least over 347 days, followed by Luci-Sof, Novus, Molloplast-B, and PermaSoft in that order (p < or = 0.05). Within the PermaSoft group, sealer applied only once changed the least over 347 days, followed by no sealer, and then sealer applied every month (p < 0.0005).
  
  
  CONCLUSIONS
  After 347 days of water storage, Tokuyama had the lowest indentation hardness changes, followed by Luci-Sof, Novus, PermaSoft with sealer applied once; Molloplast-B, PermaSoft without sealer; and PermaSoft with sealer applied every month. All HTV soft denture liners had higher indentation hardness than RTV liners initially. After 347 days, PermaSoft without sealer and with sealer every month became the hardest.
authors.affiliation: Department of Restorative Dentistry and Biomaterials, The University of Texas at Houston Dental Branch, USA.
authors.forename: Sudarat
authors.initials: S
authors.lastname: Kiat-Amnuay
authors.forename: Lawrence
authors.initials: L
authors.lastname: Gettleman
authors.forename: Trakol
authors.initials: T
authors.lastname: Mekayarajjananonth
authors.forename: Zafrulla
authors.initials: Z
authors.lastname: Khan
authors.forename: L Jane
authors.initials: LJ
authors.lastname: Goldsmith
mesh_terms: D000704:Analysis of Variance; D001593:Benzyl Compounds; D003799:Dental Stress Analysis; D003822:Denture Liners; D004129:Dimethylpolysiloxanes; D006244:Hardness; D008422:Materials Testing; D008689:Methacrylates; D009943:Organophosphorus Compounds; D011108:Polymers; D012826:Silicone Elastomers; D013997:Time Factors; D014867:Water
chemical_list: D001593:Benzyl Compounds; D004129:Dimethylpolysiloxanes; C483699:Luci-soft; C020964:MDX 4-4210; D008689:Methacrylates; D009943:Organophosphorus Compounds; C098877:PermaSoft denture liner; D011108:Polymers; D012826:Silicone Elastomers; C108974:poly(phosphazene); C076789:polyphosphazene fluoroelastomer; C501646:tokuyama soft relining; D014867:Water