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Setting stresses in composites for two different curing modes

A J Feilzer1, A J de Gee, C L Davidson

  • 1Academic Center for Dentistry Amsterdam (ACTA), Department of Dental Materials Science, The Netherlands.

Dental Materials : Official Publication of the Academy of Dental Materials
|January 1, 1993
PubMed
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Light-initiated composites (LC) exhibit higher polymerization shrinkage stress than chemically initiated composites (CC). Introducing porosity into LC composites reduced this stress, potentially due to oxygen inhibition or increased surface area.

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Dental Materials

Background:

  • Polymerization shrinkage stress is a critical factor in composite material performance, influencing stress development and material integrity.
  • Previous studies investigated chemically initiated composites (CC); this research extends the analysis to light-initiated composites (LC).

Purpose of the Study:

  • To determine the polymerization shrinkage stress development in light-initiated composites (LC) relative to the configuration factor.
  • To investigate the impact of porosity on stress development in LC composites to explain behavioral differences compared to CC composites.

Main Methods:

  • Investigated polymerization shrinkage stress in light-initiated composites (LC) based on configuration factor.
  • Incorporated porosity into LC composites to assess its effect on stress development.

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Main Results:

  • LC composites generated higher polymerization shrinkage stress, greater cohesive strength, and exhibited less flow during setting compared to CC composites.
  • The addition of porosity to LC composites led to a decrease and delay in polymerization shrinkage stress development.

Conclusions:

  • The differences in stress development between LC and CC composites may be attributed to factors like oxygen inhibition or increased free surface area from porosity.
  • Porosity can mitigate polymerization shrinkage stress in LC composites, offering a potential strategy for material modification.