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Related Experiment Videos

Flexural strength of rebased denture polymers.

N Archadian1, F Kawano, T Ohguri

  • 1Department of Dental Technology, Faculty of Dentistry, Gadjah Mada University, Indonesia.

Journal of Oral Rehabilitation
|August 10, 2000
PubMed
Summary

Thermocycling between 4-60°C did not impact the flexural strength of relined denture base polymers. However, denture base and reline polymers alone experienced decreased strength after thermocycling.

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Materials

Background:

  • Denture base and reline resins are subjected to daily temperature fluctuations between room and oral environments.
  • These temperature changes may influence the mechanical properties of denture materials.
  • Understanding the impact of thermocycling is crucial for denture longevity and performance.

Purpose of the Study:

  • To evaluate the effect of thermocycling on the flexural strength of denture base polymers when relined with hard reline resins.
  • To compare the flexural strength of combined relined denture base polymers versus individual components after thermocycling.

Main Methods:

  • Three denture base resins and three hard reline resins were tested in combination and isolation.
  • Specimens (65x10x2.5 mm) were fabricated with a 1.5 mm reline layer on a 1.0 mm denture base.

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  • Specimens underwent either static storage in distilled water at 37°C or thermocycling (20,000 cycles between 4°C and 60°C).
  • Flexural strength was measured using a three-point bending test on a universal testing machine.
  • Data were analyzed using three-way ANOVA (P<0.05).

    • Main Results:

    • The flexural strength of relined denture base polymer was significantly higher than that of the hard reline polymer alone.
    • Thermocycling did not significantly affect the flexural strength of the relined denture base polymers.
    • Both the denture base polymer and the reline polymer, when tested individually, showed a decrease in flexural strength after thermocycling.

    Conclusions:

    • Relining denture bases with hard reline resins enhances flexural strength compared to the reline material alone.
    • Thermocycling within the tested range does not compromise the flexural strength of these relined denture base systems.
    • Individual denture base and reline polymers are susceptible to strength reduction due to thermocycling, highlighting the benefit of combined application.