Residual stress in composites with the thin-ring-slitting approach

J. W. Park, J. L. Ferracane

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

During polymerization, dental composites develop residual stresses that may compromise the marginal integrity and properties of the restorative. The objective of this study was to use the thin-walled ring-slitting method to measure and compare residual stresses. The hypotheses to be tested were that composites would generate different levels of residual stress based on their specific formulations and slitting times. Rings made from composites (Z100, Herculite, and Heliomolar) were cut at different times (10 min, 1 and 24 hrs) after being light-cured, and stress was measured. Residual stress was higher at the earlier cutting times, except for Heliomolar (α < 0.05). For the 10-minute and one-hour cutting groups, stress followed this order: Z100 > Herculite > Heliomolar. Early slitting was better to capture residual stress, and the thin-walled rings showed higher values than thick-walled rings and were better able to discriminate residual stress in composites.

Original languageEnglish (US)
Pages (from-to)945-949
Number of pages5
JournalJournal of dental research
Volume85
Issue number10
DOIs
StatePublished - Oct 2006

Keywords

  • Dental composite
  • Elastic modulus
  • Residual stress
  • Ring-slitting method

ASJC Scopus subject areas

  • Dentistry(all)

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