IADR Abstract Archives
Cohesive Tensile Strength of Shortened Light-cured Bulk-Fill Composites
Objectives: To evaluate cohesive strength (CS) of different bulk-fill resin composites, light-cured by two different light curing modes.
Methods: Specimens were prepared for CTS test with three different bulk-fill composites: Tetric Evoceram Bulk-fill (TEC), Tetric Evoflow Bulk-fill (TEF), and an experimental Bulk-Fill composite (TEE) and light cured (Bluephase Style 20i) with either High curing mode for 10s (1200mw/cm2) or Turbo mode for 5s (2000 mw/cm2). The specimens were tested in a Shear Bond Tester machine until failure, immediately (24 hours) and after 5000 thermal cycles (TC). Values were recorded in MPa. Data were submitted to a normality distribution analysis, a two-way ANOVA and LSD post-hoc comparisons.
Results: When the same resin composite was light cured by different curing modes, with or without TC, no statistical differences were observed (p>0.05). RCs used with the same curing mode, showed statistical decreased cohesive strength when TC was performed (p≤0.05), however, when TEE resin composite was polymerized at high curing mode, the values were statistically similar both with and without TC (p=0.181). When different composites were compared within high curing mode with or without TC, no statistical differences were observed within them (p>0.05). For turbo curing mode, TEF presented higher cohesive strength than TEE (p=0.012) when no TC was performed, while similar results were observed compared to TEC (p=0.100). When TC was performed, no statistical differences were observed within composites (p>0.05).
Conclusions: CTS from the bulk-Fill resin composites evaluates was not be affected by curing mode, although it was affected by thermocycling for all materials and curing modes, except for the experimental material in High mode.
Methods: Specimens were prepared for CTS test with three different bulk-fill composites: Tetric Evoceram Bulk-fill (TEC), Tetric Evoflow Bulk-fill (TEF), and an experimental Bulk-Fill composite (TEE) and light cured (Bluephase Style 20i) with either High curing mode for 10s (1200mw/cm2) or Turbo mode for 5s (2000 mw/cm2). The specimens were tested in a Shear Bond Tester machine until failure, immediately (24 hours) and after 5000 thermal cycles (TC). Values were recorded in MPa. Data were submitted to a normality distribution analysis, a two-way ANOVA and LSD post-hoc comparisons.
Results: When the same resin composite was light cured by different curing modes, with or without TC, no statistical differences were observed (p>0.05). RCs used with the same curing mode, showed statistical decreased cohesive strength when TC was performed (p≤0.05), however, when TEE resin composite was polymerized at high curing mode, the values were statistically similar both with and without TC (p=0.181). When different composites were compared within high curing mode with or without TC, no statistical differences were observed within them (p>0.05). For turbo curing mode, TEF presented higher cohesive strength than TEE (p=0.012) when no TC was performed, while similar results were observed compared to TEC (p=0.100). When TC was performed, no statistical differences were observed within composites (p>0.05).
Conclusions: CTS from the bulk-Fill resin composites evaluates was not be affected by curing mode, although it was affected by thermocycling for all materials and curing modes, except for the experimental material in High mode.