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Related Experiment Videos

Stress reduction in resin-based composites cured with a two-step light-curing unit.

C P Ernst1, R Kürschner, G Rippin

  • 1Department for Restorative Dentistry and Periodontology, Johannes Gutenberg-University Mainz, Germany. Ernst@mail.uni-mainz.de

American Journal of Dentistry
|January 5, 2002
PubMed
Summary

Two-step curing significantly reduced polymerization stress in several resin-based dental composites. This method offers a promising approach for minimizing stress during dental restoration procedures.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Dental resin-based composites are widely used restorative materials.
  • Polymerization of these materials induces stress, potentially leading to marginal gaps and secondary caries.
  • Minimizing polymerization stress is crucial for long-term restoration success.

Purpose of the Study:

  • To evaluate the stress reduction efficacy of a two-step polymerization technique for various resin-based composites.
  • To compare the stress generated by standard versus two-step curing methods using photoelastic analysis.

Main Methods:

  • Seven different resin-based composite materials were tested.
  • Samples were polymerized using a standard single-step (700 mW/cm² for 40s) and a two-step protocol (150 mW/cm² for 10s, followed by 700 mW/cm² for 30s).

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  • Photoelastic investigation was employed to measure polymerization-induced stress in embedded resin samples.

    • Main Results:

    • Significant stress reduction was observed with the two-step method for Pertac II (15.5%), Tetric Ceram (14.5%), Solitaire (8.1%), Dyract AP (6.5%), and Definite (4.7%).
    • These reductions were statistically significant (P < 0.01).
    • Charisma F and Dyract showed no statistically significant difference in polymerization stress between the two curing modes.

    Conclusions:

    • The two-step polymerization method effectively reduces polymerization stress in several tested resin-based composites.
    • This technique may improve the clinical performance and longevity of dental restorations by mitigating stress-related complications.
    • Material-specific responses to the two-step curing protocol warrant further investigation.