• Institution: RICE UNIV

Impact strength of denture base and reline acrylic resins: An in vitro study

  1. Ana L Machado1
  2. Bruna C Bochio1
  3. Amanda F Wady1
  4. Janaina H Jorge1
  5. Sebastião V Canevarolo Jr2
  6. Carlos E Vergani1
  1. 1Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP—Univ Estadual Paulista, Araraquara, SP, Brazil
  2. 2Department of Materials Engineering, São Carlos Federal University, São Carlos, SP, Brazil
  1. Ana L Machado, Department of Dental Materials and Prosthodontics, Araraquara Dental School, UNESP—Univ Estadual Paulista, Rua Humaitá, no. 1680, CEP: 14801-903, Araraquara, SP, Brazil. Email: cucci{at}foar.unesp.br

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).

Article Notes

  • Funding This investigation was supported by Brazilian Council for Scientific and Technological Development (CNPq—Grant 301042/2004-7) and Sao Paulo State Research Foundation (FAPESP—Grant 05/04236-2).

This Article

  1. J Dent Biomech vol. 3 1758736012459535

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