title: Impact strength of denture base and reline acrylic resins: An in vitro study.
abstract: This study evaluated the impact strength of a denture base resin (Lucitone 550-L) and four reline resins (Tokuyama Rebase II-T; Ufi Gel Hard-U; New Truliner-NT, and Kooliner-K), both intact and in a reline combination (L/L, L/T, L/U, L/NT, and L/K). For each group (n = 20), half of the specimens were thermocycled before testing. Charpy tests were performed, and the impact strengths were calculated. Data were analyzed by two-way analyses of variance and Tukey's test (p = 0.05). For the intact groups, mean impact strength values for L (1.65 and 1.50) were significantly higher than those of the reline resins (0.38-1.17). For the relined groups, the highest mean impact strength values were produced by L/T (5.76 and 5.12), L/NT (6.20 and 6.03), and L/K (5.60 and 5.31) and the lowest by L/U (0.76 and 0.78). There were no significant differences between L and L/L. Thermocycling reduced the impact strength of T (from 0.73 to 0.38) and L/L (from 1.82 to 1.56).
authors.affiliation: Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP-Univ Estadual Paulista, Araraquara, SP, Brazil.
authors.forename: Ana L
authors.initials: AL
authors.lastname: Machado
authors.forename: Bruna C
authors.initials: BC
authors.lastname: Bochio
authors.forename: Amanda F
authors.initials: AF
authors.lastname: Wady
authors.forename: Janaina H
authors.initials: JH
authors.lastname: Jorge
authors.forename: Sebastião V
authors.initials: SV
authors.lastname: Canevarolo
authors.forename: Carlos E
authors.initials: CE
authors.lastname: Vergani