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Related Experiment Videos

Alternatives in polymerization contraction stress management.

R R Braga1, J L Ferracane

  • 1University of São Paulo, School of Dentistry, Department of Dental Materials, São Paulo-SP 05508-900, Brazil. rrbraga@usp.br

Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists
|June 10, 2004
PubMed
Summary

Dental composite polymerization contraction stress can cause restoration failures. Understanding composite properties, testing methods, and low-shrinkage innovations is key to improving bonded restoration longevity.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Restorative Dentistry

Background:

  • Polymerization contraction stress in dental composites is a significant factor in marginal and interfacial failures of bonded restorations.
  • The stress magnitude is influenced by composite composition, flowability before gelation, cavity configuration, and curing parameters.

Purpose of the Study:

  • To review variations in contraction stress testing methods and values for current dental composites.
  • To discuss the correlation between contraction stress studies and microleakage test results.
  • To explore factors influencing contraction stress, including curing rates, alternative curing routines, low-elastic-modulus liners, and novel low-shrinkage monomers.

Main Methods:

  • Review of existing literature on polymerization contraction stress in dental composites.

Related Experiment Videos

  • Analysis of various contraction-stress-testing methodologies.
  • Comparison of contraction stress values across different composite formulations.
  • Evaluation of studies investigating microleakage, curing parameters, liners, and experimental composites.

    • Main Results:

    • Significant variations exist in contraction stress testing methods and reported stress values among studies.
    • The relationship between contraction stress and microleakage requires further validation.
    • Factors such as reduced curing rates, alternative curing, and low-modulus liners can modulate contraction stress.
    • Experimental composites and new low-shrinkage monomers show promise in reducing polymerization stress.

    Conclusions:

    • Contraction stress is a critical parameter in dental restoration success, influenced by material properties and clinical factors.
    • Standardized testing methods are needed for reliable comparison of contraction stress data.
    • Further research into low-shrinkage materials and optimized curing strategies is essential for minimizing restoration failures.