The effect of water immersion on the shear bond strength between chairside reline and denture base acrylic resins: Basic science research
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Data
2007-07-01
Autores
Azevedo, Andrea [UNESP]
Machado, Ana Lucia [UNESP]
Giampaolo, Eunice Teresinha [UNESP]
Pavarina, Ana Claudia [UNESP]
Vergani, Carlos Eduardo [UNESP]
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Resumo
Purpose: The effect of water immersion on the shear bond strength (SBS) between 1 heat-polymerizing acrylic resin (Lucitone 550-L) and 4 autopolymerizing reline resins (Kooliner-K, New Truliner-N, Tokuso Rebase Fast-T, Ufi Gel Hard-U) was investigated. Specimens relined with resin L were also evaluated. Materials and Methods: One hundred sixty cylinders (20 × 20 mm) of L denture base resin were processed, and the reline resins were packed on the prepared bonding surfaces using a split-mold (3.5 × 5.0 mm). Shear tests (0.5 mm/min) were performed on the specimens (n = 8) after polymerization (control), and after immersion in water at 37°C for 7, 90, and 180 days. All fractured surfaces were examined by scanning electron microscopy (SEM) to calculate the percentage of cohesive fracture (PCF). Shear data were analyzed with 2-way ANOVA and Tukey's test; Kruskall-Wallis test was used to analyze PCF data (α = 0.05). Results: After 90 days water immersion, an increase in the mean SBS was observed for U (11.13 to 16.53 MPa; p < 0.001) and T (9.08 to 13.24 MPa, p = 0.035), whereas resin L showed a decrease (21.74 MPa to 14.96 MPa; p < 0.001). The SBS of resins K (8.44 MPa) and N (7.98 MPa) remained unaffected. The mean PCF was lower than 32.6% for K, N, and T, and higher than 65.6% for U and L. Conclusions: Long-term water immersion did not adversely affect the bond of materials K, N, T, and U and decreased the values of resin L. Materials L and U failed cohesively, and K, N, and T failed adhesively. © 2007 by The American College of Prosthodontists.
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Acrylic resins, Relining, Shear strength, Water storage, acrylic acid resin, kooliner, Lucitone, methacrylic acid derivative, polymer, silastic, Tokuso Rebase Fast, truliner, Ufi gel, unclassified drug, water, adhesion, chemistry, dental bonding, denture, human, immersion, materials testing, mechanical stress, scanning electron microscopy, shear strength, time, Acrylic Resins, Adhesiveness, Dental Bonding, Denture Bases, Denture Liners, Denture Rebasing, Humans, Immersion, Materials Testing, Methacrylates, Microscopy, Electron, Scanning, Polymers, Shear Strength, Silicone Elastomers, Stress, Mechanical, Time Factors, Water
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Journal of Prosthodontics, v. 16, n. 4, p. 255-262, 2007.