Impact strength of denture base and reline acrylic resins subjected to long-term water immersion
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Data
2011-05-13
Autores
Wady, Amanda Fucci [UNESP]
Machado, Ana Lucia [UNESP]
Vergani, Carlos Eduardo [UNESP]
Pavarina, Ana Claudia [UNESP]
Giampaolo, Eunice Teresinha [UNESP]
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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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Palavras-chave
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
Como citar
Brazilian Dental Journal, v. 22, n. 1, p. 56-61, 2011.