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The Effect of Water Immersion on the Shear Bond Strength Between Chairside Reline and Denture Base Acrylic Resins
Author(s) -
Azevedo Andrea,
Machado Ana Lucia,
Giampaolo Eunice Teresinha,
Pavarina Ana Claudia,
Vergani Carlos Eduardo
Publication year - 2007
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2007.00188.x
Subject(s) - acrylic resin , materials science , immersion (mathematics) , composite material , bond strength , dentistry , dental bonding , medicine , adhesive , mathematics , layer (electronics) , pure mathematics , coating
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.