Acoustic emission analysis of tooth-composite interfacial debonding

N. Y. Cho, J. L. Ferracane, I. B. Lee

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


This study detected tooth-composite interfacial debonding during composite restoration by means of acoustic emission (AE) analysis and investigated the effects of composite properties and adhesives on AE characteristics. The polymerization shrinkage, peak shrinkage rate, flexural modulus, and shrinkage stress of a methacrylate-based universal hybrid, a flowable, and a silorane-based composite were measured. Class I cavities on 49 extracted premolars were restored with 1 of the 3 composites and 1 of the following adhesives: 2 etch-and-rinse adhesives, 2 self-etch adhesives, and an adhesive for the silorane-based composite. AE analysis was done for 2,000 sec during light-curing. The silorane-based composite exhibited the lowest shrinkage (rate), the longest time to peak shrinkage rate, the lowest shrinkage stress, and the fewest AE events. AE events were detected immediately after the beginning of light-curing in most composite-adhesive combinations, but not until 40 sec after light-curing began for the silorane-based composite. AE events were concentrated at the initial stage of curing in self-etch adhesives compared with etch-and-rinse adhesives. Reducing the shrinkage (rate) of composites resulted in reduced shrinkage stress and less debonding, as evidenced by fewer AE events. AE is an effective technique for monitoring, in real time, the debonding kinetics at the tooth-composite interface.

Original languageEnglish (US)
Pages (from-to)76-81
Number of pages6
JournalJournal of dental research
Issue number1
StatePublished - Jan 2013


  • etch-and-rinse adhesive
  • exponential curing
  • flowable composite
  • polymerization shrinkage stress
  • self-etch adhesive
  • silorane

ASJC Scopus subject areas

  • Dentistry(all)


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