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Related Experiment Videos

Polymerization contraction stress in light-cured packable composite resins.

H Y Chen1, J Manhart, R Hickel

  • 1Department of Restorative Dentistry, Dental School of the Ludwig-Maximilians University, Goethe Street 70, 80336, Munich, Germany. hchen@dent.med.uni-muenchen.de

Dental Materials : Official Publication of the Academy of Dental Materials
|March 21, 2001
PubMed
Summary

Packable dental composites generate higher polymerization contraction stress than conventional hybrid composites, potentially compromising bond integrity. This suggests packable resins may not offer superior adhesion to tooth structure.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Polymerization contraction stress in dental composites is a critical factor influencing restoration longevity.
  • Packable composites offer handling advantages but their stress generation characteristics require thorough evaluation.
  • Understanding contraction stress is vital for preventing secondary caries and improving clinical outcomes.

Purpose of the Study:

  • To determine and compare the polymerization contraction stress of various packable composites and a packable ORMOCER material.
  • To evaluate these materials against a conventional hybrid composite (Tetric Ceram).
  • To assess the implications of contraction stress on bond integrity with tooth structure.

Main Methods:

  • Polymerization contraction force was measured using a Stress-Strain-Analyzer.

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  • Materials included packable composites (ALERT, Surefil, Solitaire, Solitaire 2), a packable ORMOCER (Definite), and a conventional hybrid composite (Tetric Ceram).
  • Contraction stress, force rate, and relative force rate were statistically analyzed.

    • Main Results:

    • Packable materials exhibited significantly higher maximum contraction stresses (3.13–4.60 MPa) compared to Tetric Ceram (2.51 MPa).
    • Tetric Ceram showed the significantly lowest force rate, with an S-shaped force/time curve.
    • Solitaire demonstrated a longer pre-gelation phase before contraction force development.

    Conclusions:

    • Packable composite resins generate higher contraction stress and develop force more rapidly during early setting.
    • This increased stress may compromise the bond between the restoration and cavity walls.
    • Conventional hybrid composite Tetric Ceram appears superior in managing contraction stress, potentially offering better bond maintenance.