Objectives: The aim of this study was to investigate the fracture resistance of heat-cured (Acron, GC, Japan) and non-heat-cured (Unifast II, GC) acrylic denture base resins with a conventional (Tokuso rebase, Tokuyama, Japan) and a newly developed elastic (Tokuyama rebase II) reline resin. Methods: Four kinds of combined plates (30 x 30 x 4 mm) of base resins and reline resins (a thickness of 2 mm each) were fabricated according to the manufacture's directions. Ten specimens (4 x 4 x 30 mm) were milled from the each plate by diamond disk. Forty specimens were stored in a distilled water at 37°C for 24 hrs and a three-point flexural test was carried with a universal testing machine at a cross head speed of 1 mm/min and span length of 20 mm. We calculated the averages of flexural strength and destruction energy. The data were examined by one-factor ANOVA. Results: There was no-significant difference between a conventional (Acron: 97.0 +/- 11 MPa, Unifast: 81.7 +/- 6.1 MPa) and a newly developed (Acron: 86.8 +/- 8.2 MPa, Unifast: 74.0 +/- 3.4 MPa) relined specimens in flexural strength. However, newly developed relined specimens (Acron: 218 +/- 82 J, Unifast: 500 +/- 153 J) has higher destruction energy than conventional one (Acron: 129 +/- 57 J, Unifast: 157 +/- 72 J) (P<0.05). Conclusion: According to the results of this study, newly developed elastic reline material having higher destruction energy works as a shock-absorber for resistance to impact and deformation.

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