Impact strength of denture base and reline acrylic resins subjected to long-term water immersion
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FapUNIFESP (SciELO)
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Acesso aberto
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Resumo
Water may influence the mechanical properties of the acrylic resins. Thus, the effect of water storage on the impact strength (IS) of one denture base (Lucitone 550 - L) and four reline resins (Tokuyama Rebase II - T; UfiGel Hard - U; Kooliner - K; New Truliner - NT) was evaluated. Bars of L were made (60 x 6 x 2 mm) and relined (2 mm) with T, U, K, NT and L. Intact specimens of each material (60 x 6 x 4 mm) were also fabricated for comparative purposes. Specimens were submitted to Charpy impact tests without water storage (control) and after immersion in water for 7, 90 and 180 days. Data (kJ/m 2) analyzed by two-way ANOVA and Tukey's test (p=0.05) revealed that after 90 days, U exhibited an increase in the IS (0.93) compared to 7 days (0.58). K (1.48) and L/K (7.21) exhibited a decrease at the 7-day period (1.01 and 3.23, respectively). NT (0.60) showed an increase in the IS after 180 days (1.52), whereas L/ NT (7.70) showed a decrease (3.17). Water immersion improved the IS of U and NT, and decreased the IS of K, L/K, and L/NT. Water may affect differently the IS of acrylic resins and, consequently, the resistance to fracture of relined denture bases.
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Acrylic resins , Impact strength , Relining , Removable dentures , Water immersion , acrylic acid resin , water , adhesion , chemistry , comparative study , dental care , denture , immersion , mastication , materials testing , Acrylic Resins , Adhesiveness , Bite Force , Dental Stress Analysis , Denture Bases , Denture Liners , Denture Rebasing , Immersion , Materials Testing , Water
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Inglês
Citação
Brazilian Dental Journal, v. 22, n. 1, p. 56-61, 2011.
