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Related Experiment Videos

Shrinkage stresses associated with incremental composite filling techniques

J R Jedrychowski1, R G Bleier, A A Caputo

  • 1Section of Pediatric Dentistry, UCLA School of Dentistry, USA.

ASDC Journal of Dentistry for Children
|June 9, 1998
PubMed
Summary

Contrary to common belief, incremental filling techniques for composite resins did not significantly reduce polymerization shrinkage stresses. Bulk placement of composite resin generated the lowest stresses in photoelastic models.

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering
  • Polymer Science

Background:

  • Polymerization shrinkage of composite resins is a significant clinical concern, potentially leading to stress generation.
  • Incremental filling is widely adopted to mitigate these shrinkage stresses.
  • Recent finite element analysis suggests incremental techniques may increase stress in simple preparations.

Purpose of the Study:

  • To visualize and compare polymerization shrinkage-induced stresses in photoelastic models.
  • To evaluate different incremental filling techniques against bulk placement in molar preparations.

Main Methods:

  • Photoelastic models of primary molar preparations were created.
  • Cavity walls were treated with unfilled resin.

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  • Hybrid composite resin was placed using gingivo-occlusal, oblique, facio-lingual, and bulk techniques.
  • Stresses were observed using circular polariscopy.

    • Main Results:

    • Few significant differences in shrinkage stresses were observed among the tested incremental techniques.
    • The bulk placement technique resulted in the lowest observed shrinkage-induced stresses.
    • Photoelastic analysis provided direct visualization of stress distribution.

    Conclusions:

    • The conventional understanding that incremental placement reduces polymerization shrinkage stress may not hold true for all techniques.
    • Bulk placement demonstrated superior performance in minimizing shrinkage stress in this photoelastic model study.
    • Further research is needed to fully elucidate the biomechanical effects of different composite placement strategies.